From patchwork Mon Sep 21 14:34:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 296705 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20C14C43478 for ; Mon, 21 Sep 2020 14:35:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9218206E5 for ; Mon, 21 Sep 2020 14:35:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="h5C0cP74" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727393AbgIUOeh (ORCPT ); Mon, 21 Sep 2020 10:34:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42180 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726341AbgIUOec (ORCPT ); Mon, 21 Sep 2020 10:34:32 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C7C4C0613CF; Mon, 21 Sep 2020 07:34:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=tfXqHGtFwgmM6UcSRx58+EM7ODTSdMOtwKoRg1u1yAY=; b=h5C0cP745frGI6LFd4dq0v1VC6 dlre8+k7vu02YmAZ8W+aYC7/KFVYWpjVw4xuvxDaZNd2Z6QBa9oiL0Wj/Hkv5xYC2wYLt9KCBe8bl TYAoN6sz7hdDgHMalPgUQTr+fLk7AIcfJFZomtrhfeUIwlk6hulwAl1drU0/fuTNP7wSa0Q5YwXJV epTQJexY9j8oJJFTiE4IOj814WqvBV14TzUclzJplEScbfbnyXCkjYiSnhMOe79Hf9o1hSteR7Rvm SSHXMAUvLZDteiCW+SEwO+/7lrFRnDtCQ8YijeIlpmrJacTqjMfI2M+KPH2OSNdgKTyq62UNZlM0b PcBfcm0Q==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtY-0007qo-Gk; Mon, 21 Sep 2020 14:34:20 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 01/11] compat.h: fix a spelling error in Date: Mon, 21 Sep 2020 16:34:24 +0200 Message-Id: <20200921143434.707844-2-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org There is no compat_sys_readv64v2 syscall, only a compat_sys_preadv64v2 one. Signed-off-by: Christoph Hellwig --- include/linux/compat.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/compat.h b/include/linux/compat.h index b354ce58966e2d..654c1ec36671a4 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -812,7 +812,7 @@ asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd, const struct compat_iovec __user *vec, compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags); #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2 -asmlinkage long compat_sys_readv64v2(unsigned long fd, +asmlinkage long compat_sys_preadv64v2(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen, loff_t pos, rwf_t flags); #endif From patchwork Mon Sep 21 14:34:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 257576 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 893AEC43465 for ; Mon, 21 Sep 2020 14:34:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 55427222BB for ; Mon, 21 Sep 2020 14:34:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="GRkfTBxW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727440AbgIUOej (ORCPT ); Mon, 21 Sep 2020 10:34:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726501AbgIUOed (ORCPT ); Mon, 21 Sep 2020 10:34:33 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 15CFCC0613D0; Mon, 21 Sep 2020 07:34:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=puJFCdMF2FXbv89uAHf/KkyLCkpGKdSCiHzE06eX0/Y=; b=GRkfTBxWaYN59mWczbVBJZ/J4z kVM8Nphlbf3FY02zkGWWBVM283NPs2K9y+IDVdwyxNN1Q6a4B7YoCyWtJodiottCcy6XpP96dRyGn JHkp6fow0Ism2aY5WYKFck/rP6z+BMXBmYaJqqKRA5DWZwKptXaUZhs1y+Gx9Hcs78ge5sNfRyKIN h2HYTgdyzISCw5GbBnBiQ0zAOMx4TZdmJQTPfx5COcVblaZe9D1Cqm0YVjyEpK04tgDaqtazmJ5UR ftg8Mk3Zj7g+8AAriBQApIZOIJYX0rTvWCnxH8RgTXNwePT8RLDRBDPDY+Cv19f1nEHzB8vcryJzp d7oTPRIQ==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtZ-0007rC-EL; Mon, 21 Sep 2020 14:34:21 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org, David Laight , David Laight Subject: [PATCH 02/11] mm: call import_iovec() instead of rw_copy_check_uvector() in process_vm_rw() Date: Mon, 21 Sep 2020 16:34:25 +0200 Message-Id: <20200921143434.707844-3-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: David Laight This is the only direct call of rw_copy_check_uvector(). Removing it will allow rw_copy_check_uvector() to be inlined into import_iovec(), while only paying a minor price by setting up an otherwise unused iov_iter in the process_vm_readv/process_vm_writev syscalls that aren't in a super hot path. Signed-off-by: David Laight [hch: expanded the commit log, pass CHECK_IOVEC_ONLY instead of 0 for the compat case, handle CHECK_IOVEC_ONLY in iov_iter_init] Signed-off-by: Christoph Hellwig --- lib/iov_iter.c | 2 +- mm/process_vm_access.c | 33 ++++++++++++++++++--------------- 2 files changed, 19 insertions(+), 16 deletions(-) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 5e40786c8f1232..db54588406dfae 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -443,7 +443,7 @@ void iov_iter_init(struct iov_iter *i, unsigned int direction, const struct iovec *iov, unsigned long nr_segs, size_t count) { - WARN_ON(direction & ~(READ | WRITE)); + WARN_ON(direction & ~(READ | WRITE | CHECK_IOVEC_ONLY)); direction &= READ | WRITE; /* It will get better. Eventually... */ diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index 29c052099affdc..40cd502c337534 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -264,7 +264,7 @@ static ssize_t process_vm_rw(pid_t pid, struct iovec iovstack_r[UIO_FASTIOV]; struct iovec *iov_l = iovstack_l; struct iovec *iov_r = iovstack_r; - struct iov_iter iter; + struct iov_iter iter_l, iter_r; ssize_t rc; int dir = vm_write ? WRITE : READ; @@ -272,23 +272,25 @@ static ssize_t process_vm_rw(pid_t pid, return -EINVAL; /* Check iovecs */ - rc = import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter); + rc = import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter_l); if (rc < 0) return rc; - if (!iov_iter_count(&iter)) + if (!iov_iter_count(&iter_l)) goto free_iovecs; - rc = rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV, - iovstack_r, &iov_r); + rc = import_iovec(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV, &iov_r, + &iter_r); if (rc <= 0) goto free_iovecs; - rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write); + rc = process_vm_rw_core(pid, &iter_l, iter_r.iov, iter_r.nr_segs, + flags, vm_write); free_iovecs: if (iov_r != iovstack_r) kfree(iov_r); - kfree(iov_l); + if (iov_l != iovstack_l) + kfree(iov_l); return rc; } @@ -322,30 +324,31 @@ compat_process_vm_rw(compat_pid_t pid, struct iovec iovstack_r[UIO_FASTIOV]; struct iovec *iov_l = iovstack_l; struct iovec *iov_r = iovstack_r; - struct iov_iter iter; + struct iov_iter iter_l, iter_r; ssize_t rc = -EFAULT; int dir = vm_write ? WRITE : READ; if (flags != 0) return -EINVAL; - rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter); + rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter_l); if (rc < 0) return rc; - if (!iov_iter_count(&iter)) + if (!iov_iter_count(&iter_l)) goto free_iovecs; - rc = compat_rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, - UIO_FASTIOV, iovstack_r, - &iov_r); + rc = compat_import_iovec(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV, + &iov_r, &iter_r); if (rc <= 0) goto free_iovecs; - rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write); + rc = process_vm_rw_core(pid, &iter_l, iter_r.iov, iter_r.nr_segs, + flags, vm_write); free_iovecs: if (iov_r != iovstack_r) kfree(iov_r); - kfree(iov_l); + if (iov_l != iovstack_l) + kfree(iov_l); return rc; } From patchwork Mon Sep 21 14:34:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 296703 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA6CFC4346E for ; Mon, 21 Sep 2020 14:36:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9504A20BED for ; Mon, 21 Sep 2020 14:36:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="mbONURe7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727871AbgIUOgP (ORCPT ); Mon, 21 Sep 2020 10:36:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727124AbgIUOef (ORCPT ); Mon, 21 Sep 2020 10:34:35 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5AFE2C0613CF; Mon, 21 Sep 2020 07:34:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=LCXn2FJbni+/tCTK8D6nVLYSdWCMV5d/zHCD2VrYDAs=; b=mbONURe77St7uQ3PnKdyMO8YWN lHHxh8Rej95j3EcLKqhP+y4tGyd99cd/ffdxqZV8yebCrwLM4eoxys1lPtV4nVdcd41zESCOCPd2p 95UzbhUrv2C0Zdd6/UauA1rhV5yGsydVTGeKguxbWl7TGmSbLoMHa4oxCvrISI4jXTzJPl9t/ozf0 3zgYR6Q2PTzlKw8BHxuK6Qw05qaz8+AyJOCrLu1xBMHb4joZOGQAT0ZIWIWSX26qT2lyaclnBdPz4 K58eZEN+KtEyvxIyL1cW01OE8EcmQ61Ns90iHf2WcQeGgqx1xswzI6xvrLYFrpcdHJHk8/G7gWXzW SBn8XVIg==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMta-0007rG-G7; Mon, 21 Sep 2020 14:34:23 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org, David Laight , David Laight Subject: [PATCH 03/11] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c and mark it static Date: Mon, 21 Sep 2020 16:34:26 +0200 Message-Id: <20200921143434.707844-4-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: David Laight This lets the compiler inline it into import_iovec() generating much better code. Signed-off-by: David Laight [hch: drop the now pointless kerneldoc for a static function, and update a few other comments] Signed-off-by: Christoph Hellwig --- fs/read_write.c | 179 ----------------------------------------- include/linux/compat.h | 6 -- include/linux/fs.h | 11 +-- lib/iov_iter.c | 150 +++++++++++++++++++++++++++++++++- 4 files changed, 151 insertions(+), 195 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 5db58b8c78d0dd..e5e891a88442ef 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -752,185 +752,6 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, return ret; } -/** - * rw_copy_check_uvector() - Copy an array of &struct iovec from userspace - * into the kernel and check that it is valid. - * - * @type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE. - * @uvector: Pointer to the userspace array. - * @nr_segs: Number of elements in userspace array. - * @fast_segs: Number of elements in @fast_pointer. - * @fast_pointer: Pointer to (usually small on-stack) kernel array. - * @ret_pointer: (output parameter) Pointer to a variable that will point to - * either @fast_pointer, a newly allocated kernel array, or NULL, - * depending on which array was used. - * - * This function copies an array of &struct iovec of @nr_segs from - * userspace into the kernel and checks that each element is valid (e.g. - * it does not point to a kernel address or cause overflow by being too - * large, etc.). - * - * As an optimization, the caller may provide a pointer to a small - * on-stack array in @fast_pointer, typically %UIO_FASTIOV elements long - * (the size of this array, or 0 if unused, should be given in @fast_segs). - * - * @ret_pointer will always point to the array that was used, so the - * caller must take care not to call kfree() on it e.g. in case the - * @fast_pointer array was used and it was allocated on the stack. - * - * Return: The total number of bytes covered by the iovec array on success - * or a negative error code on error. - */ -ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, - unsigned long nr_segs, unsigned long fast_segs, - struct iovec *fast_pointer, - struct iovec **ret_pointer) -{ - unsigned long seg; - ssize_t ret; - struct iovec *iov = fast_pointer; - - /* - * SuS says "The readv() function *may* fail if the iovcnt argument - * was less than or equal to 0, or greater than {IOV_MAX}. Linux has - * traditionally returned zero for zero segments, so... - */ - if (nr_segs == 0) { - ret = 0; - goto out; - } - - /* - * First get the "struct iovec" from user memory and - * verify all the pointers - */ - if (nr_segs > UIO_MAXIOV) { - ret = -EINVAL; - goto out; - } - if (nr_segs > fast_segs) { - iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL); - if (iov == NULL) { - ret = -ENOMEM; - goto out; - } - } - if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { - ret = -EFAULT; - goto out; - } - - /* - * According to the Single Unix Specification we should return EINVAL - * if an element length is < 0 when cast to ssize_t or if the - * total length would overflow the ssize_t return value of the - * system call. - * - * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the - * overflow case. - */ - ret = 0; - for (seg = 0; seg < nr_segs; seg++) { - void __user *buf = iov[seg].iov_base; - ssize_t len = (ssize_t)iov[seg].iov_len; - - /* see if we we're about to use an invalid len or if - * it's about to overflow ssize_t */ - if (len < 0) { - ret = -EINVAL; - goto out; - } - if (type >= 0 - && unlikely(!access_ok(buf, len))) { - ret = -EFAULT; - goto out; - } - if (len > MAX_RW_COUNT - ret) { - len = MAX_RW_COUNT - ret; - iov[seg].iov_len = len; - } - ret += len; - } -out: - *ret_pointer = iov; - return ret; -} - -#ifdef CONFIG_COMPAT -ssize_t compat_rw_copy_check_uvector(int type, - const struct compat_iovec __user *uvector, unsigned long nr_segs, - unsigned long fast_segs, struct iovec *fast_pointer, - struct iovec **ret_pointer) -{ - compat_ssize_t tot_len; - struct iovec *iov = *ret_pointer = fast_pointer; - ssize_t ret = 0; - int seg; - - /* - * SuS says "The readv() function *may* fail if the iovcnt argument - * was less than or equal to 0, or greater than {IOV_MAX}. Linux has - * traditionally returned zero for zero segments, so... - */ - if (nr_segs == 0) - goto out; - - ret = -EINVAL; - if (nr_segs > UIO_MAXIOV) - goto out; - if (nr_segs > fast_segs) { - ret = -ENOMEM; - iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL); - if (iov == NULL) - goto out; - } - *ret_pointer = iov; - - ret = -EFAULT; - if (!access_ok(uvector, nr_segs*sizeof(*uvector))) - goto out; - - /* - * Single unix specification: - * We should -EINVAL if an element length is not >= 0 and fitting an - * ssize_t. - * - * In Linux, the total length is limited to MAX_RW_COUNT, there is - * no overflow possibility. - */ - tot_len = 0; - ret = -EINVAL; - for (seg = 0; seg < nr_segs; seg++) { - compat_uptr_t buf; - compat_ssize_t len; - - if (__get_user(len, &uvector->iov_len) || - __get_user(buf, &uvector->iov_base)) { - ret = -EFAULT; - goto out; - } - if (len < 0) /* size_t not fitting in compat_ssize_t .. */ - goto out; - if (type >= 0 && - !access_ok(compat_ptr(buf), len)) { - ret = -EFAULT; - goto out; - } - if (len > MAX_RW_COUNT - tot_len) - len = MAX_RW_COUNT - tot_len; - tot_len += len; - iov->iov_base = compat_ptr(buf); - iov->iov_len = (compat_size_t) len; - uvector++; - iov++; - } - ret = tot_len; - -out: - return ret; -} -#endif - static ssize_t do_iter_read(struct file *file, struct iov_iter *iter, loff_t *pos, rwf_t flags) { diff --git a/include/linux/compat.h b/include/linux/compat.h index 654c1ec36671a4..b930de791ff16b 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -451,12 +451,6 @@ extern long compat_arch_ptrace(struct task_struct *child, compat_long_t request, struct epoll_event; /* fortunately, this one is fixed-layout */ -extern ssize_t compat_rw_copy_check_uvector(int type, - const struct compat_iovec __user *uvector, - unsigned long nr_segs, - unsigned long fast_segs, struct iovec *fast_pointer, - struct iovec **ret_pointer); - extern void __user *compat_alloc_user_space(unsigned long len); int compat_restore_altstack(const compat_stack_t __user *uss); diff --git a/include/linux/fs.h b/include/linux/fs.h index 7519ae003a082c..5420822104a99d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -179,10 +179,8 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define FMODE_BUF_RASYNC ((__force fmode_t)0x40000000) /* - * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector - * that indicates that they should check the contents of the iovec are - * valid, but not check the memory that the iovec elements - * points too. + * Flag for import_iovec that indicates that it should check the contents of the + * iovec is valid, but not check the memory that the iovec elements points too. */ #define CHECK_IOVEC_ONLY -1 @@ -1887,11 +1885,6 @@ static inline int call_mmap(struct file *file, struct vm_area_struct *vma) return file->f_op->mmap(file, vma); } -ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, - unsigned long nr_segs, unsigned long fast_segs, - struct iovec *fast_pointer, - struct iovec **ret_pointer); - extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t vfs_readv(struct file *, const struct iovec __user *, diff --git a/lib/iov_iter.c b/lib/iov_iter.c index db54588406dfae..d7e72343c360eb 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1650,12 +1650,87 @@ const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags) } EXPORT_SYMBOL(dup_iter); +static ssize_t rw_copy_check_uvector(int type, + const struct iovec __user *uvector, unsigned long nr_segs, + unsigned long fast_segs, struct iovec *fast_pointer, + struct iovec **ret_pointer) +{ + unsigned long seg; + ssize_t ret; + struct iovec *iov = fast_pointer; + + /* + * SuS says "The readv() function *may* fail if the iovcnt argument + * was less than or equal to 0, or greater than {IOV_MAX}. Linux has + * traditionally returned zero for zero segments, so... + */ + if (nr_segs == 0) { + ret = 0; + goto out; + } + + /* + * First get the "struct iovec" from user memory and + * verify all the pointers + */ + if (nr_segs > UIO_MAXIOV) { + ret = -EINVAL; + goto out; + } + if (nr_segs > fast_segs) { + iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL); + if (iov == NULL) { + ret = -ENOMEM; + goto out; + } + } + if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { + ret = -EFAULT; + goto out; + } + + /* + * According to the Single Unix Specification we should return EINVAL + * if an element length is < 0 when cast to ssize_t or if the + * total length would overflow the ssize_t return value of the + * system call. + * + * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the + * overflow case. + */ + ret = 0; + for (seg = 0; seg < nr_segs; seg++) { + void __user *buf = iov[seg].iov_base; + ssize_t len = (ssize_t)iov[seg].iov_len; + + /* see if we we're about to use an invalid len or if + * it's about to overflow ssize_t */ + if (len < 0) { + ret = -EINVAL; + goto out; + } + if (type >= 0 + && unlikely(!access_ok(buf, len))) { + ret = -EFAULT; + goto out; + } + if (len > MAX_RW_COUNT - ret) { + len = MAX_RW_COUNT - ret; + iov[seg].iov_len = len; + } + ret += len; + } +out: + *ret_pointer = iov; + return ret; +} + /** * import_iovec() - Copy an array of &struct iovec from userspace * into the kernel, check that it is valid, and initialize a new * &struct iov_iter iterator to access it. * - * @type: One of %READ or %WRITE. + * @type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE. * @uvector: Pointer to the userspace array. * @nr_segs: Number of elements in userspace array. * @fast_segs: Number of elements in @iov. @@ -1695,6 +1770,79 @@ EXPORT_SYMBOL(import_iovec); #ifdef CONFIG_COMPAT #include +static ssize_t compat_rw_copy_check_uvector(int type, + const struct compat_iovec __user *uvector, unsigned long nr_segs, + unsigned long fast_segs, struct iovec *fast_pointer, + struct iovec **ret_pointer) +{ + compat_ssize_t tot_len; + struct iovec *iov = *ret_pointer = fast_pointer; + ssize_t ret = 0; + int seg; + + /* + * SuS says "The readv() function *may* fail if the iovcnt argument + * was less than or equal to 0, or greater than {IOV_MAX}. Linux has + * traditionally returned zero for zero segments, so... + */ + if (nr_segs == 0) + goto out; + + ret = -EINVAL; + if (nr_segs > UIO_MAXIOV) + goto out; + if (nr_segs > fast_segs) { + ret = -ENOMEM; + iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL); + if (iov == NULL) + goto out; + } + *ret_pointer = iov; + + ret = -EFAULT; + if (!access_ok(uvector, nr_segs*sizeof(*uvector))) + goto out; + + /* + * Single unix specification: + * We should -EINVAL if an element length is not >= 0 and fitting an + * ssize_t. + * + * In Linux, the total length is limited to MAX_RW_COUNT, there is + * no overflow possibility. + */ + tot_len = 0; + ret = -EINVAL; + for (seg = 0; seg < nr_segs; seg++) { + compat_uptr_t buf; + compat_ssize_t len; + + if (__get_user(len, &uvector->iov_len) || + __get_user(buf, &uvector->iov_base)) { + ret = -EFAULT; + goto out; + } + if (len < 0) /* size_t not fitting in compat_ssize_t .. */ + goto out; + if (type >= 0 && + !access_ok(compat_ptr(buf), len)) { + ret = -EFAULT; + goto out; + } + if (len > MAX_RW_COUNT - tot_len) + len = MAX_RW_COUNT - tot_len; + tot_len += len; + iov->iov_base = compat_ptr(buf); + iov->iov_len = (compat_size_t) len; + uvector++; + iov++; + } + ret = tot_len; + +out: + return ret; +} + ssize_t compat_import_iovec(int type, const struct compat_iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, From patchwork Mon Sep 21 14:34:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 296704 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE95AC4346A for ; Mon, 21 Sep 2020 14:35:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE20F20735 for ; Mon, 21 Sep 2020 14:35:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Cr3xQBVQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727825AbgIUOf5 (ORCPT ); Mon, 21 Sep 2020 10:35:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727349AbgIUOef (ORCPT ); Mon, 21 Sep 2020 10:34:35 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 457F5C0613D0; Mon, 21 Sep 2020 07:34:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=hvHVjgb7+ogIHMv2QziVfmEo4wIHVDzxSBO7sgqq+LI=; b=Cr3xQBVQWALKH7tuoir4RRrOx5 ObtytscKgX2pD9jdFKZl7OAaSGqHvKMY6QdN1AAeL7iPRdfGMnnuAKRp2fO3zs/Qa1qanBrJcMzlp 2i6iNQiXjZlAfSdr8eSouVvMxW6Jwy5mKeEirvXr3ZTTiIIwvkxrQMh9XAJw5QuRUQsbNqdCQQyyW WDrgFWFBzIj4YkZNzY0XDygo/V19wuSoL2WQzUur+fGNL+3uLi2J6QXLcsQR+yhOTXD5FmYG9PgHH hyhjGiAZI27lRyg9jFDzu3lo4ZZQVp8d384XapZSVtaSeOjqaz3u6nukSqWN2rkY3CEe6gIiU4FAO cLQDX6OQ==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtc-0007rU-GX; Mon, 21 Sep 2020 14:34:24 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 04/11] iov_iter: explicitly check for CHECK_IOVEC_ONLY in rw_copy_check_uvector Date: Mon, 21 Sep 2020 16:34:27 +0200 Message-Id: <20200921143434.707844-5-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Explicitly check for the magic value insted of implicitly relying on its numeric representation. Also drop the rather pointless unlikely annotation. Signed-off-by: Christoph Hellwig --- lib/iov_iter.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index d7e72343c360eb..a64867501a7483 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1709,8 +1709,7 @@ static ssize_t rw_copy_check_uvector(int type, ret = -EINVAL; goto out; } - if (type >= 0 - && unlikely(!access_ok(buf, len))) { + if (type != CHECK_IOVEC_ONLY && !access_ok(buf, len)) { ret = -EFAULT; goto out; } @@ -1824,7 +1823,7 @@ static ssize_t compat_rw_copy_check_uvector(int type, } if (len < 0) /* size_t not fitting in compat_ssize_t .. */ goto out; - if (type >= 0 && + if (type != CHECK_IOVEC_ONLY && !access_ok(compat_ptr(buf), len)) { ret = -EFAULT; goto out; From patchwork Mon Sep 21 14:34:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 257573 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 869D9C43466 for ; Mon, 21 Sep 2020 14:35:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4021A20735 for ; Mon, 21 Sep 2020 14:35:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Fj58CJcp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727786AbgIUOfo (ORCPT ); Mon, 21 Sep 2020 10:35:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727378AbgIUOeh (ORCPT ); Mon, 21 Sep 2020 10:34:37 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 989B5C061755; Mon, 21 Sep 2020 07:34:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Go9jhNaIOowAS6zneWVKxUnX9eeQI4Dg/fB924GqFYE=; b=Fj58CJcpE4sDehkNalXnmTWxw3 DGiFYIP4alu/yNV8DzWwojGGHVbkvpmKEO7O+v0+KEtvpmTaC/8+AUg0vCnlW8Wpv+pAOL+TIHAXs Lf9zgvzv0nGbJApTt23suPBMJYvD/I52+eYKa80lYKU2kYmiupntzgNpmlacjuZmaAb/jexwc15yY OjMhbL124H+1M/SLeR2CIAEo+Lf9JqavRm3CepjlI3zAdY9MdM0FPRHh4OAXo3OG8B1/qJAe/+KNI w2LkgoRumDCz5RSjK0Fm3jjyQE6KRkOn4CicLrA3zvg0nRNU1GqT3jtXECzFud20JC5Wb2no3nlLO 4ZZEkf/w==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtd-0007rg-Jy; Mon, 21 Sep 2020 14:34:25 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 05/11] iov_iter: merge the compat case into rw_copy_check_uvector Date: Mon, 21 Sep 2020 16:34:28 +0200 Message-Id: <20200921143434.707844-6-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Stop duplicating the iovec verify code, and instead add add a __import_iovec helper that does the whole verify and import, but takes a bool compat to decided on the native or compat layout. This also ends up massively simplifying the calling conventions. Signed-off-by: Christoph Hellwig --- lib/iov_iter.c | 195 ++++++++++++++++++------------------------------- 1 file changed, 70 insertions(+), 125 deletions(-) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index a64867501a7483..8bfa47b63d39aa 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -10,6 +10,7 @@ #include #include #include +#include #define PIPE_PARANOIA /* for now */ @@ -1650,43 +1651,76 @@ const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags) } EXPORT_SYMBOL(dup_iter); -static ssize_t rw_copy_check_uvector(int type, - const struct iovec __user *uvector, unsigned long nr_segs, - unsigned long fast_segs, struct iovec *fast_pointer, - struct iovec **ret_pointer) +static int compat_copy_iovecs_from_user(struct iovec *iov, + const struct iovec __user *uvector, unsigned long nr_segs) +{ + const struct compat_iovec __user *uiov = + (const struct compat_iovec __user *)uvector; + unsigned long i; + int ret = -EFAULT; + + if (!user_access_begin(uvector, nr_segs * sizeof(*uvector))) + return -EFAULT; + + for (i = 0; i < nr_segs; i++) { + compat_uptr_t buf; + compat_ssize_t len; + + unsafe_get_user(len, &uiov[i].iov_len, out); + unsafe_get_user(buf, &uiov[i].iov_base, out); + + /* check for compat_size_t not fitting in compat_ssize_t .. */ + if (len < 0) { + ret = -EINVAL; + goto out; + } + iov[i].iov_base = compat_ptr(buf); + iov[i].iov_len = len; + } + ret = 0; +out: + user_access_end(); + return ret; +} + +static ssize_t __import_iovec(int type, const struct iovec __user *uvector, + unsigned nr_segs, unsigned fast_segs, struct iovec **iovp, + struct iov_iter *i, bool compat) { + struct iovec *iov = *iovp; unsigned long seg; - ssize_t ret; - struct iovec *iov = fast_pointer; + ssize_t ret = 0; /* * SuS says "The readv() function *may* fail if the iovcnt argument * was less than or equal to 0, or greater than {IOV_MAX}. Linux has * traditionally returned zero for zero segments, so... */ - if (nr_segs == 0) { - ret = 0; - goto out; - } + if (nr_segs == 0) + goto done; /* * First get the "struct iovec" from user memory and * verify all the pointers */ - if (nr_segs > UIO_MAXIOV) { - ret = -EINVAL; - goto out; - } + ret = -EINVAL; + if (nr_segs > UIO_MAXIOV) + goto fail; if (nr_segs > fast_segs) { + ret = -ENOMEM; iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL); - if (iov == NULL) { - ret = -ENOMEM; - goto out; - } + if (!iov) + goto fail; } - if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { + + if (compat) { + ret = compat_copy_iovecs_from_user(iov, uvector, nr_segs); + if (ret) + goto fail; + } else { ret = -EFAULT; - goto out; + if (copy_from_user(iov, uvector, nr_segs * sizeof(*uvector))) + goto fail; } /* @@ -1707,11 +1741,11 @@ static ssize_t rw_copy_check_uvector(int type, * it's about to overflow ssize_t */ if (len < 0) { ret = -EINVAL; - goto out; + goto fail; } if (type != CHECK_IOVEC_ONLY && !access_ok(buf, len)) { ret = -EFAULT; - goto out; + goto fail; } if (len > MAX_RW_COUNT - ret) { len = MAX_RW_COUNT - ret; @@ -1719,8 +1753,17 @@ static ssize_t rw_copy_check_uvector(int type, } ret += len; } -out: - *ret_pointer = iov; +done: + iov_iter_init(i, type, iov, nr_segs, ret); + if (iov == *iovp) + *iovp = NULL; + else + *iovp = iov; + return ret; +fail: + if (iov != *iovp) + kfree(iov); + *iovp = NULL; return ret; } @@ -1750,116 +1793,18 @@ ssize_t import_iovec(int type, const struct iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, struct iovec **iov, struct iov_iter *i) { - ssize_t n; - struct iovec *p; - n = rw_copy_check_uvector(type, uvector, nr_segs, fast_segs, - *iov, &p); - if (n < 0) { - if (p != *iov) - kfree(p); - *iov = NULL; - return n; - } - iov_iter_init(i, type, p, nr_segs, n); - *iov = p == *iov ? NULL : p; - return n; + return __import_iovec(type, uvector, nr_segs, fast_segs, iov, i, false); } EXPORT_SYMBOL(import_iovec); #ifdef CONFIG_COMPAT -#include - -static ssize_t compat_rw_copy_check_uvector(int type, - const struct compat_iovec __user *uvector, unsigned long nr_segs, - unsigned long fast_segs, struct iovec *fast_pointer, - struct iovec **ret_pointer) -{ - compat_ssize_t tot_len; - struct iovec *iov = *ret_pointer = fast_pointer; - ssize_t ret = 0; - int seg; - - /* - * SuS says "The readv() function *may* fail if the iovcnt argument - * was less than or equal to 0, or greater than {IOV_MAX}. Linux has - * traditionally returned zero for zero segments, so... - */ - if (nr_segs == 0) - goto out; - - ret = -EINVAL; - if (nr_segs > UIO_MAXIOV) - goto out; - if (nr_segs > fast_segs) { - ret = -ENOMEM; - iov = kmalloc_array(nr_segs, sizeof(struct iovec), GFP_KERNEL); - if (iov == NULL) - goto out; - } - *ret_pointer = iov; - - ret = -EFAULT; - if (!access_ok(uvector, nr_segs*sizeof(*uvector))) - goto out; - - /* - * Single unix specification: - * We should -EINVAL if an element length is not >= 0 and fitting an - * ssize_t. - * - * In Linux, the total length is limited to MAX_RW_COUNT, there is - * no overflow possibility. - */ - tot_len = 0; - ret = -EINVAL; - for (seg = 0; seg < nr_segs; seg++) { - compat_uptr_t buf; - compat_ssize_t len; - - if (__get_user(len, &uvector->iov_len) || - __get_user(buf, &uvector->iov_base)) { - ret = -EFAULT; - goto out; - } - if (len < 0) /* size_t not fitting in compat_ssize_t .. */ - goto out; - if (type != CHECK_IOVEC_ONLY && - !access_ok(compat_ptr(buf), len)) { - ret = -EFAULT; - goto out; - } - if (len > MAX_RW_COUNT - tot_len) - len = MAX_RW_COUNT - tot_len; - tot_len += len; - iov->iov_base = compat_ptr(buf); - iov->iov_len = (compat_size_t) len; - uvector++; - iov++; - } - ret = tot_len; - -out: - return ret; -} - ssize_t compat_import_iovec(int type, const struct compat_iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, struct iovec **iov, struct iov_iter *i) { - ssize_t n; - struct iovec *p; - n = compat_rw_copy_check_uvector(type, uvector, nr_segs, fast_segs, - *iov, &p); - if (n < 0) { - if (p != *iov) - kfree(p); - *iov = NULL; - return n; - } - iov_iter_init(i, type, p, nr_segs, n); - *iov = p == *iov ? NULL : p; - return n; + return __import_iovec(type, (const struct iovec __user *)uvector, + nr_segs, fast_segs, iov, i, true); } EXPORT_SYMBOL(compat_import_iovec); #endif From patchwork Mon Sep 21 14:34:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 257572 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C16FC4346A for ; Mon, 21 Sep 2020 14:36:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0613C20735 for ; Mon, 21 Sep 2020 14:36:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="FaYNCJyy" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727837AbgIUOf5 (ORCPT ); Mon, 21 Sep 2020 10:35:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42190 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727131AbgIUOef (ORCPT ); Mon, 21 Sep 2020 10:34:35 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E11FC061755; Mon, 21 Sep 2020 07:34:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=HMS3wpmHJ08+TjASQ52pDgUhrjMpeVTpap30GBFvOAE=; b=FaYNCJyyME4i3uvXayjfkbvAqj z7tJWyj7bZEt0QdENw0WQ7ww4hTah5nBc2c2ZYSSjANmXgH5MhdZkY2vwwLERNLSdqHgqDMYrbdhA 7Y1IUhSVsaLoqQXCT2FYvxcvjkCIZhdAnxRI60M1X9M+kWvZdxBNBkB6Tt0V4O0MvwNMj3L5s1NAl mjajE+5ZNJkcQm0JWVF9Efr6csREsE6r4SgdAjoDPcoC0HRp6t6pHecWQaQy8HBQFVDyodVwJe0bV Mzfpqr3Grxf3py+y+PrDRx4RHgYCqvX+UhqY27e2Y9L07pRI7fUC4KFQt/YUN1imvNFX0qVSNi19y tDqOx4sw==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMte-0007rq-Pi; Mon, 21 Sep 2020 14:34:27 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 06/11] iov_iter: handle the compat case in import_iovec Date: Mon, 21 Sep 2020 16:34:29 +0200 Message-Id: <20200921143434.707844-7-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Use in compat_syscall to import either native or the compat iovecs, and remove the now superflous compat_import_iovec, which removes the need for special compat logic in most callers. Only io_uring needs special treatment given that it can call import_iovec from kernel threads acting on behalf of native or compat syscalls. Expose the low-level __import_iovec helper and use it in io_uring to explicitly pick a iovec layout. Signed-off-by: Christoph Hellwig --- block/scsi_ioctl.c | 12 ++---------- drivers/scsi/sg.c | 9 +-------- fs/aio.c | 38 ++++++++++++++------------------------ fs/io_uring.c | 20 ++++++++------------ fs/read_write.c | 6 ++++-- fs/splice.c | 2 +- include/linux/uio.h | 10 +++------- lib/iov_iter.c | 17 +++-------------- mm/process_vm_access.c | 7 ++++--- net/compat.c | 4 ++-- security/keys/compat.c | 5 ++--- 11 files changed, 44 insertions(+), 86 deletions(-) diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index ef722f04f88a93..e08df86866ee5d 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -333,16 +333,8 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk, struct iov_iter i; struct iovec *iov = NULL; -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) - ret = compat_import_iovec(rq_data_dir(rq), - hdr->dxferp, hdr->iovec_count, - 0, &iov, &i); - else -#endif - ret = import_iovec(rq_data_dir(rq), - hdr->dxferp, hdr->iovec_count, - 0, &iov, &i); + ret = import_iovec(rq_data_dir(rq), hdr->dxferp, + hdr->iovec_count, 0, &iov, &i); if (ret < 0) goto out_free_cdb; diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 20472aaaf630a4..bfa8d77322d732 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -1820,14 +1820,7 @@ sg_start_req(Sg_request *srp, unsigned char *cmd) struct iovec *iov = NULL; struct iov_iter i; -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) - res = compat_import_iovec(rw, hp->dxferp, iov_count, - 0, &iov, &i); - else -#endif - res = import_iovec(rw, hp->dxferp, iov_count, - 0, &iov, &i); + res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i); if (res < 0) return res; diff --git a/fs/aio.c b/fs/aio.c index d5ec303855669d..b377f5c2048e18 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -1478,8 +1478,7 @@ static int aio_prep_rw(struct kiocb *req, const struct iocb *iocb) } static ssize_t aio_setup_rw(int rw, const struct iocb *iocb, - struct iovec **iovec, bool vectored, bool compat, - struct iov_iter *iter) + struct iovec **iovec, bool vectored, struct iov_iter *iter) { void __user *buf = (void __user *)(uintptr_t)iocb->aio_buf; size_t len = iocb->aio_nbytes; @@ -1489,11 +1488,6 @@ static ssize_t aio_setup_rw(int rw, const struct iocb *iocb, *iovec = NULL; return ret; } -#ifdef CONFIG_COMPAT - if (compat) - return compat_import_iovec(rw, buf, len, UIO_FASTIOV, iovec, - iter); -#endif return import_iovec(rw, buf, len, UIO_FASTIOV, iovec, iter); } @@ -1517,8 +1511,7 @@ static inline void aio_rw_done(struct kiocb *req, ssize_t ret) } } -static int aio_read(struct kiocb *req, const struct iocb *iocb, - bool vectored, bool compat) +static int aio_read(struct kiocb *req, const struct iocb *iocb, bool vectored) { struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; struct iov_iter iter; @@ -1535,7 +1528,7 @@ static int aio_read(struct kiocb *req, const struct iocb *iocb, if (unlikely(!file->f_op->read_iter)) return -EINVAL; - ret = aio_setup_rw(READ, iocb, &iovec, vectored, compat, &iter); + ret = aio_setup_rw(READ, iocb, &iovec, vectored, &iter); if (ret < 0) return ret; ret = rw_verify_area(READ, file, &req->ki_pos, iov_iter_count(&iter)); @@ -1545,8 +1538,7 @@ static int aio_read(struct kiocb *req, const struct iocb *iocb, return ret; } -static int aio_write(struct kiocb *req, const struct iocb *iocb, - bool vectored, bool compat) +static int aio_write(struct kiocb *req, const struct iocb *iocb, bool vectored) { struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; struct iov_iter iter; @@ -1563,7 +1555,7 @@ static int aio_write(struct kiocb *req, const struct iocb *iocb, if (unlikely(!file->f_op->write_iter)) return -EINVAL; - ret = aio_setup_rw(WRITE, iocb, &iovec, vectored, compat, &iter); + ret = aio_setup_rw(WRITE, iocb, &iovec, vectored, &iter); if (ret < 0) return ret; ret = rw_verify_area(WRITE, file, &req->ki_pos, iov_iter_count(&iter)); @@ -1799,8 +1791,7 @@ static int aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb) } static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb, - struct iocb __user *user_iocb, struct aio_kiocb *req, - bool compat) + struct iocb __user *user_iocb, struct aio_kiocb *req) { req->ki_filp = fget(iocb->aio_fildes); if (unlikely(!req->ki_filp)) @@ -1833,13 +1824,13 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb, switch (iocb->aio_lio_opcode) { case IOCB_CMD_PREAD: - return aio_read(&req->rw, iocb, false, compat); + return aio_read(&req->rw, iocb, false); case IOCB_CMD_PWRITE: - return aio_write(&req->rw, iocb, false, compat); + return aio_write(&req->rw, iocb, false); case IOCB_CMD_PREADV: - return aio_read(&req->rw, iocb, true, compat); + return aio_read(&req->rw, iocb, true); case IOCB_CMD_PWRITEV: - return aio_write(&req->rw, iocb, true, compat); + return aio_write(&req->rw, iocb, true); case IOCB_CMD_FSYNC: return aio_fsync(&req->fsync, iocb, false); case IOCB_CMD_FDSYNC: @@ -1852,8 +1843,7 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb, } } -static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, - bool compat) +static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb) { struct aio_kiocb *req; struct iocb iocb; @@ -1882,7 +1872,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, if (unlikely(!req)) return -EAGAIN; - err = __io_submit_one(ctx, &iocb, user_iocb, req, compat); + err = __io_submit_one(ctx, &iocb, user_iocb, req); /* Done with the synchronous reference */ iocb_put(req); @@ -1941,7 +1931,7 @@ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr, break; } - ret = io_submit_one(ctx, user_iocb, false); + ret = io_submit_one(ctx, user_iocb); if (ret) break; } @@ -1983,7 +1973,7 @@ COMPAT_SYSCALL_DEFINE3(io_submit, compat_aio_context_t, ctx_id, break; } - ret = io_submit_one(ctx, compat_ptr(user_iocb), true); + ret = io_submit_one(ctx, compat_ptr(user_iocb)); if (ret) break; } diff --git a/fs/io_uring.c b/fs/io_uring.c index 3790c7fe9fee22..ba84ecea7cb1a4 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2837,13 +2837,8 @@ static ssize_t __io_import_iovec(int rw, struct io_kiocb *req, return ret; } -#ifdef CONFIG_COMPAT - if (req->ctx->compat) - return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, - iovec, iter); -#endif - - return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); + return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, + req->ctx->compat); } static ssize_t io_import_iovec(int rw, struct io_kiocb *req, @@ -4179,8 +4174,9 @@ static int __io_recvmsg_copy_hdr(struct io_kiocb *req, sr->len); iomsg->iov = NULL; } else { - ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, - &iomsg->iov, &iomsg->msg.msg_iter); + ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, + &iomsg->iov, &iomsg->msg.msg_iter, + false); if (ret > 0) ret = 0; } @@ -4220,9 +4216,9 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, sr->len = iomsg->iov[0].iov_len; iomsg->iov = NULL; } else { - ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, - &iomsg->iov, - &iomsg->msg.msg_iter); + ret = __import_iovec(READ, (struct iovec __user *)uiov, len, + UIO_FASTIOV, &iomsg->iov, + &iomsg->msg.msg_iter, true); if (ret < 0) return ret; } diff --git a/fs/read_write.c b/fs/read_write.c index e5e891a88442ef..0a68037580b455 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1078,7 +1078,8 @@ static size_t compat_readv(struct file *file, struct iov_iter iter; ssize_t ret; - ret = compat_import_iovec(READ, vec, vlen, UIO_FASTIOV, &iov, &iter); + ret = import_iovec(READ, (const struct iovec __user *)vec, vlen, + UIO_FASTIOV, &iov, &iter); if (ret >= 0) { ret = do_iter_read(file, &iter, pos, flags); kfree(iov); @@ -1186,7 +1187,8 @@ static size_t compat_writev(struct file *file, struct iov_iter iter; ssize_t ret; - ret = compat_import_iovec(WRITE, vec, vlen, UIO_FASTIOV, &iov, &iter); + ret = import_iovec(WRITE, (const struct iovec __user *)vec, vlen, + UIO_FASTIOV, &iov, &iter); if (ret >= 0) { file_start_write(file); ret = do_iter_write(file, &iter, pos, flags); diff --git a/fs/splice.c b/fs/splice.c index d7c8a7c4db07ff..132d42b9871f9b 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -1387,7 +1387,7 @@ COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, io if (error) return error; - error = compat_import_iovec(type, iov32, nr_segs, + error = import_iovec(type, (struct iovec __user *)iov32, nr_segs, ARRAY_SIZE(iovstack), &iov, &iter); if (error >= 0) { error = do_vmsplice(f.file, &iter, flags); diff --git a/include/linux/uio.h b/include/linux/uio.h index 3835a8a8e9eae0..fff5d49dd0d53e 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -269,13 +269,9 @@ size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp, ssize_t import_iovec(int type, const struct iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, struct iovec **iov, struct iov_iter *i); - -#ifdef CONFIG_COMPAT -struct compat_iovec; -ssize_t compat_import_iovec(int type, const struct compat_iovec __user * uvector, - unsigned nr_segs, unsigned fast_segs, - struct iovec **iov, struct iov_iter *i); -#endif +ssize_t __import_iovec(int type, const struct iovec __user *uvector, + unsigned nr_segs, unsigned fast_segs, struct iovec **iovp, + struct iov_iter *i, bool compat); int import_single_range(int type, void __user *buf, size_t len, struct iovec *iov, struct iov_iter *i); diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 8bfa47b63d39aa..632265178d8737 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1683,7 +1683,7 @@ static int compat_copy_iovecs_from_user(struct iovec *iov, return ret; } -static ssize_t __import_iovec(int type, const struct iovec __user *uvector, +ssize_t __import_iovec(int type, const struct iovec __user *uvector, unsigned nr_segs, unsigned fast_segs, struct iovec **iovp, struct iov_iter *i, bool compat) { @@ -1793,22 +1793,11 @@ ssize_t import_iovec(int type, const struct iovec __user * uvector, unsigned nr_segs, unsigned fast_segs, struct iovec **iov, struct iov_iter *i) { - return __import_iovec(type, uvector, nr_segs, fast_segs, iov, i, false); + return __import_iovec(type, uvector, nr_segs, fast_segs, iov, i, + in_compat_syscall()); } EXPORT_SYMBOL(import_iovec); -#ifdef CONFIG_COMPAT -ssize_t compat_import_iovec(int type, - const struct compat_iovec __user * uvector, - unsigned nr_segs, unsigned fast_segs, - struct iovec **iov, struct iov_iter *i) -{ - return __import_iovec(type, (const struct iovec __user *)uvector, - nr_segs, fast_segs, iov, i, true); -} -EXPORT_SYMBOL(compat_import_iovec); -#endif - int import_single_range(int rw, void __user *buf, size_t len, struct iovec *iov, struct iov_iter *i) { diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index 40cd502c337534..b759ed264840d8 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -331,13 +331,14 @@ compat_process_vm_rw(compat_pid_t pid, if (flags != 0) return -EINVAL; - rc = compat_import_iovec(dir, lvec, liovcnt, UIO_FASTIOV, &iov_l, &iter_l); + rc = import_iovec(dir, (const struct iovec __user *)iov_l, liovcnt, + UIO_FASTIOV, &iov_l, &iter_l); if (rc < 0) return rc; if (!iov_iter_count(&iter_l)) goto free_iovecs; - rc = compat_import_iovec(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV, - &iov_r, &iter_r); + rc = import_iovec(CHECK_IOVEC_ONLY, iov_r, riovcnt, UIO_FASTIOV, &iov_r, + &iter_r); if (rc <= 0) goto free_iovecs; diff --git a/net/compat.c b/net/compat.c index 95ce707a30a31d..ddd15af3a2837b 100644 --- a/net/compat.c +++ b/net/compat.c @@ -98,8 +98,8 @@ int get_compat_msghdr(struct msghdr *kmsg, if (err) return err; - err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), - len, UIO_FASTIOV, iov, &kmsg->msg_iter); + err = import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), len, + UIO_FASTIOV, iov, &kmsg->msg_iter); return err < 0 ? err : 0; } diff --git a/security/keys/compat.c b/security/keys/compat.c index 6ee9d8f6a4a5bb..7ae531db031cf8 100644 --- a/security/keys/compat.c +++ b/security/keys/compat.c @@ -33,9 +33,8 @@ static long compat_keyctl_instantiate_key_iov( if (!_payload_iov) ioc = 0; - ret = compat_import_iovec(WRITE, _payload_iov, ioc, - ARRAY_SIZE(iovstack), &iov, - &from); + ret = import_iovec(WRITE, (const struct iovec __user *)_payload_iov, + ioc, ARRAY_SIZE(iovstack), &iov, &from); if (ret < 0) return ret; From patchwork Mon Sep 21 14:34:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 257575 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A630C4346B for ; Mon, 21 Sep 2020 14:35:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D272B22262 for ; Mon, 21 Sep 2020 14:35:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="YNCWa3mX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727610AbgIUOev (ORCPT ); Mon, 21 Sep 2020 10:34:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727453AbgIUOek (ORCPT ); Mon, 21 Sep 2020 10:34:40 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2763DC0613D0; Mon, 21 Sep 2020 07:34:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=ZJRp28PMlTdViRaEFVh58ely0fCO34dl1prBreJiUZM=; b=YNCWa3mX687pVucLxXxvPrQldG Z0M2GtU77O8snqhA9+YgkU1wiAgh4wbEEGyi+fz4ekuRST2iyNujOPH5AOtUK9g8jmtfKF3O2hygo NZxZ8kFlBzg1ouAb7F32WmKxUHj5CfofDEAHeJp3L3AqA2ffk25xEHVMP5idPlD9ysaUH5J7xQme2 2wQ53TXN8lgBWEh2eWaUWUfMKr+UApc491vwNqZeVIPfBnXV7AnV6ecVqhPaT/PavvUNFjiMQMmvj BucDdsicEwoOjNhwnA9weyl5aOATSJ20woh9vdtcaLdU8VxPpOyRQEzeNxPCknxciF7txjYrNZVTW uPOntnHA==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtf-0007ry-T6; Mon, 21 Sep 2020 14:34:28 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 07/11] fs: remove various compat readv/writev helpers Date: Mon, 21 Sep 2020 16:34:30 +0200 Message-Id: <20200921143434.707844-8-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Now that import_iovec handles compat iovecs as well, all the duplicated code in the compat readv/writev helpers is not needed. Remove them and switch the compat syscall handlers to use the native helpers. Signed-off-by: Christoph Hellwig --- fs/read_write.c | 179 ++++++++---------------------------------------- 1 file changed, 30 insertions(+), 149 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 0a68037580b455..eab427b7cc0a3f 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1068,226 +1068,107 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, return do_pwritev(fd, vec, vlen, pos, flags); } +/* + * Various compat syscalls. Note that they all pretend to take a native + * iovec - import_iovec will properly treat those as compat_iovecs based on + * in_compat_syscall(). + */ #ifdef CONFIG_COMPAT -static size_t compat_readv(struct file *file, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t *pos, rwf_t flags) -{ - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t ret; - - ret = import_iovec(READ, (const struct iovec __user *)vec, vlen, - UIO_FASTIOV, &iov, &iter); - if (ret >= 0) { - ret = do_iter_read(file, &iter, pos, flags); - kfree(iov); - } - if (ret > 0) - add_rchar(current, ret); - inc_syscr(current); - return ret; -} - -static size_t do_compat_readv(compat_ulong_t fd, - const struct compat_iovec __user *vec, - compat_ulong_t vlen, rwf_t flags) -{ - struct fd f = fdget_pos(fd); - ssize_t ret; - loff_t pos; - - if (!f.file) - return -EBADF; - pos = f.file->f_pos; - ret = compat_readv(f.file, vec, vlen, &pos, flags); - if (ret >= 0) - f.file->f_pos = pos; - fdput_pos(f); - return ret; - -} - COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, compat_ulong_t, vlen) { - return do_compat_readv(fd, vec, vlen, 0); -} - -static long do_compat_preadv64(unsigned long fd, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t pos, rwf_t flags) -{ - struct fd f; - ssize_t ret; - - if (pos < 0) - return -EINVAL; - f = fdget(fd); - if (!f.file) - return -EBADF; - ret = -ESPIPE; - if (f.file->f_mode & FMODE_PREAD) - ret = compat_readv(f.file, vec, vlen, &pos, flags); - fdput(f); - return ret; + return do_readv(fd, vec, vlen, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos) { - return do_compat_preadv64(fd, vec, vlen, pos, 0); + return do_preadv(fd, vec, vlen, pos, 0); } #endif COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; - return do_compat_preadv64(fd, vec, vlen, pos, 0); + return do_preadv(fd, vec, vlen, pos, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2 COMPAT_SYSCALL_DEFINE5(preadv64v2, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos, rwf_t, flags) { if (pos == -1) - return do_compat_readv(fd, vec, vlen, flags); - - return do_compat_preadv64(fd, vec, vlen, pos, flags); + return do_readv(fd, vec, vlen, flags); + return do_preadv(fd, vec, vlen, pos, flags); } #endif COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high, rwf_t, flags) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; if (pos == -1) - return do_compat_readv(fd, vec, vlen, flags); - - return do_compat_preadv64(fd, vec, vlen, pos, flags); -} - -static size_t compat_writev(struct file *file, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t *pos, rwf_t flags) -{ - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t ret; - - ret = import_iovec(WRITE, (const struct iovec __user *)vec, vlen, - UIO_FASTIOV, &iov, &iter); - if (ret >= 0) { - file_start_write(file); - ret = do_iter_write(file, &iter, pos, flags); - file_end_write(file); - kfree(iov); - } - if (ret > 0) - add_wchar(current, ret); - inc_syscw(current); - return ret; -} - -static size_t do_compat_writev(compat_ulong_t fd, - const struct compat_iovec __user* vec, - compat_ulong_t vlen, rwf_t flags) -{ - struct fd f = fdget_pos(fd); - ssize_t ret; - loff_t pos; - - if (!f.file) - return -EBADF; - pos = f.file->f_pos; - ret = compat_writev(f.file, vec, vlen, &pos, flags); - if (ret >= 0) - f.file->f_pos = pos; - fdput_pos(f); - return ret; + return do_readv(fd, vec, vlen, flags); + return do_preadv(fd, vec, vlen, pos, flags); } COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, - const struct compat_iovec __user *, vec, + const struct iovec __user *, vec, compat_ulong_t, vlen) { - return do_compat_writev(fd, vec, vlen, 0); -} - -static long do_compat_pwritev64(unsigned long fd, - const struct compat_iovec __user *vec, - unsigned long vlen, loff_t pos, rwf_t flags) -{ - struct fd f; - ssize_t ret; - - if (pos < 0) - return -EINVAL; - f = fdget(fd); - if (!f.file) - return -EBADF; - ret = -ESPIPE; - if (f.file->f_mode & FMODE_PWRITE) - ret = compat_writev(f.file, vec, vlen, &pos, flags); - fdput(f); - return ret; + return do_writev(fd, vec, vlen, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos) { - return do_compat_pwritev64(fd, vec, vlen, pos, 0); + return do_pwritev(fd, vec, vlen, pos, 0); } #endif COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *,vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; - return do_compat_pwritev64(fd, vec, vlen, pos, 0); + return do_pwritev(fd, vec, vlen, pos, 0); } #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2 COMPAT_SYSCALL_DEFINE5(pwritev64v2, unsigned long, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *, vec, unsigned long, vlen, loff_t, pos, rwf_t, flags) { if (pos == -1) - return do_compat_writev(fd, vec, vlen, flags); - - return do_compat_pwritev64(fd, vec, vlen, pos, flags); + return do_writev(fd, vec, vlen, flags); + return do_pwritev(fd, vec, vlen, pos, flags); } #endif COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd, - const struct compat_iovec __user *,vec, + const struct iovec __user *,vec, compat_ulong_t, vlen, u32, pos_low, u32, pos_high, rwf_t, flags) { loff_t pos = ((loff_t)pos_high << 32) | pos_low; if (pos == -1) - return do_compat_writev(fd, vec, vlen, flags); - - return do_compat_pwritev64(fd, vec, vlen, pos, flags); + return do_writev(fd, vec, vlen, flags); + return do_pwritev(fd, vec, vlen, pos, flags); } - -#endif +#endif /* CONFIG_COMPAT */ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count, loff_t max) From patchwork Mon Sep 21 14:34:31 2020 Content-Type: text/plain; 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Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMth-0007sD-7F; Mon, 21 Sep 2020 14:34:29 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 08/11] fs: remove the compat readv/writev syscalls Date: Mon, 21 Sep 2020 16:34:31 +0200 Message-Id: <20200921143434.707844-9-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Now that import_iovec handles compat iovecs, the native readv and writev syscalls can be used for the compat case as well. Signed-off-by: Christoph Hellwig --- arch/arm64/include/asm/unistd32.h | 4 ++-- arch/mips/kernel/syscalls/syscall_n32.tbl | 4 ++-- arch/mips/kernel/syscalls/syscall_o32.tbl | 4 ++-- arch/parisc/kernel/syscalls/syscall.tbl | 4 ++-- arch/powerpc/kernel/syscalls/syscall.tbl | 4 ++-- arch/s390/kernel/syscalls/syscall.tbl | 4 ++-- arch/sparc/kernel/syscalls/syscall.tbl | 4 ++-- arch/x86/entry/syscall_x32.c | 2 ++ arch/x86/entry/syscalls/syscall_32.tbl | 4 ++-- arch/x86/entry/syscalls/syscall_64.tbl | 4 ++-- fs/read_write.c | 14 -------------- include/linux/compat.h | 4 ---- include/uapi/asm-generic/unistd.h | 4 ++-- tools/include/uapi/asm-generic/unistd.h | 4 ++-- tools/perf/arch/powerpc/entry/syscalls/syscall.tbl | 4 ++-- tools/perf/arch/s390/entry/syscalls/syscall.tbl | 4 ++-- tools/perf/arch/x86/entry/syscalls/syscall_64.tbl | 4 ++-- 17 files changed, 30 insertions(+), 46 deletions(-) diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 734860ac7cf9d5..4a236493dca5b9 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -301,9 +301,9 @@ __SYSCALL(__NR_flock, sys_flock) #define __NR_msync 144 __SYSCALL(__NR_msync, sys_msync) #define __NR_readv 145 -__SYSCALL(__NR_readv, compat_sys_readv) +__SYSCALL(__NR_readv, sys_readv) #define __NR_writev 146 -__SYSCALL(__NR_writev, compat_sys_writev) +__SYSCALL(__NR_writev, sys_writev) #define __NR_getsid 147 __SYSCALL(__NR_getsid, sys_getsid) #define __NR_fdatasync 148 diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl index f9df9edb67a407..c99a92646f8ee9 100644 --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -25,8 +25,8 @@ 15 n32 ioctl compat_sys_ioctl 16 n32 pread64 sys_pread64 17 n32 pwrite64 sys_pwrite64 -18 n32 readv compat_sys_readv -19 n32 writev compat_sys_writev +18 n32 readv sys_readv +19 n32 writev sys_writev 20 n32 access sys_access 21 n32 pipe sysm_pipe 22 n32 _newselect compat_sys_select diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl index 195b43cf27c848..075064d10661bf 100644 --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -156,8 +156,8 @@ 142 o32 _newselect sys_select compat_sys_select 143 o32 flock sys_flock 144 o32 msync sys_msync -145 o32 readv sys_readv compat_sys_readv -146 o32 writev sys_writev compat_sys_writev +145 o32 readv sys_readv +146 o32 writev sys_writev 147 o32 cacheflush sys_cacheflush 148 o32 cachectl sys_cachectl 149 o32 sysmips __sys_sysmips diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl index def64d221cd4fb..192abde0001d9d 100644 --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -159,8 +159,8 @@ 142 common _newselect sys_select compat_sys_select 143 common flock sys_flock 144 common msync sys_msync -145 common readv sys_readv compat_sys_readv -146 common writev sys_writev compat_sys_writev +145 common readv sys_readv +146 common writev sys_writev 147 common getsid sys_getsid 148 common fdatasync sys_fdatasync 149 common _sysctl sys_ni_syscall diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl index c2d737ff2e7bec..6f1e2ecf0edad9 100644 --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -193,8 +193,8 @@ 142 common _newselect sys_select compat_sys_select 143 common flock sys_flock 144 common msync sys_msync -145 common readv sys_readv compat_sys_readv -146 common writev sys_writev compat_sys_writev +145 common readv sys_readv +146 common writev sys_writev 147 common getsid sys_getsid 148 common fdatasync sys_fdatasync 149 nospu _sysctl sys_ni_syscall diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl index 10456bc936fb09..6101cf2e004cb4 100644 --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -134,8 +134,8 @@ 142 64 select sys_select - 143 common flock sys_flock sys_flock 144 common msync sys_msync sys_msync -145 common readv sys_readv compat_sys_readv -146 common writev sys_writev compat_sys_writev +145 common readv sys_readv sys_readv +146 common writev sys_writev sys_writev 147 common getsid sys_getsid sys_getsid 148 common fdatasync sys_fdatasync sys_fdatasync 149 common _sysctl - - diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl index 4af114e84f2022..a87ddb282ab16f 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -149,8 +149,8 @@ 117 common getrusage sys_getrusage compat_sys_getrusage 118 common getsockopt sys_getsockopt sys_getsockopt 119 common getcwd sys_getcwd -120 common readv sys_readv compat_sys_readv -121 common writev sys_writev compat_sys_writev +120 common readv sys_readv +121 common writev sys_writev 122 common settimeofday sys_settimeofday compat_sys_settimeofday 123 32 fchown sys_fchown16 123 64 fchown sys_fchown diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c index 1583831f61a9df..aa321444a41f63 100644 --- a/arch/x86/entry/syscall_x32.c +++ b/arch/x86/entry/syscall_x32.c @@ -12,6 +12,8 @@ * Reuse the 64-bit entry points for the x32 versions that occupy different * slots in the syscall table. */ +#define __x32_sys_readv __x64_sys_readv +#define __x32_sys_writev __x64_sys_writev #define __x32_sys_getsockopt __x64_sys_getsockopt #define __x32_sys_setsockopt __x64_sys_setsockopt diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 9d11028736661b..54ab4beb517f25 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -156,8 +156,8 @@ 142 i386 _newselect sys_select compat_sys_select 143 i386 flock sys_flock 144 i386 msync sys_msync -145 i386 readv sys_readv compat_sys_readv -146 i386 writev sys_writev compat_sys_writev +145 i386 readv sys_readv +146 i386 writev sys_writev 147 i386 getsid sys_getsid 148 i386 fdatasync sys_fdatasync 149 i386 _sysctl sys_ni_syscall diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index f30d6ae9a6883c..b1e59957c5c51c 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -371,8 +371,8 @@ 512 x32 rt_sigaction compat_sys_rt_sigaction 513 x32 rt_sigreturn compat_sys_x32_rt_sigreturn 514 x32 ioctl compat_sys_ioctl -515 x32 readv compat_sys_readv -516 x32 writev compat_sys_writev +515 x32 readv sys_readv +516 x32 writev sys_writev 517 x32 recvfrom compat_sys_recvfrom 518 x32 sendmsg compat_sys_sendmsg 519 x32 recvmsg compat_sys_recvmsg diff --git a/fs/read_write.c b/fs/read_write.c index eab427b7cc0a3f..6c13f744c34a38 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1074,13 +1074,6 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, * in_compat_syscall(). */ #ifdef CONFIG_COMPAT -COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, - const struct iovec __user *, vec, - compat_ulong_t, vlen) -{ - return do_readv(fd, vec, vlen, 0); -} - #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, const struct iovec __user *, vec, @@ -1122,13 +1115,6 @@ COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd, return do_preadv(fd, vec, vlen, pos, flags); } -COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, - const struct iovec __user *, vec, - compat_ulong_t, vlen) -{ - return do_writev(fd, vec, vlen, 0); -} - #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, const struct iovec __user *, vec, diff --git a/include/linux/compat.h b/include/linux/compat.h index b930de791ff16b..fa39b7a5488d70 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -545,10 +545,6 @@ asmlinkage long compat_sys_getdents(unsigned int fd, /* fs/read_write.c */ asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int); -asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd, - const struct compat_iovec __user *vec, compat_ulong_t vlen); -asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd, - const struct compat_iovec __user *vec, compat_ulong_t vlen); /* No generic prototype for pread64 and pwrite64 */ asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd, const struct compat_iovec __user *vec, diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index 995b36c2ea7d8a..211c9eacbda6eb 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -207,9 +207,9 @@ __SYSCALL(__NR_read, sys_read) #define __NR_write 64 __SYSCALL(__NR_write, sys_write) #define __NR_readv 65 -__SC_COMP(__NR_readv, sys_readv, compat_sys_readv) +__SC_COMP(__NR_readv, sys_readv, sys_readv) #define __NR_writev 66 -__SC_COMP(__NR_writev, sys_writev, compat_sys_writev) +__SC_COMP(__NR_writev, sys_writev, sys_writev) #define __NR_pread64 67 __SC_COMP(__NR_pread64, sys_pread64, compat_sys_pread64) #define __NR_pwrite64 68 diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h index 995b36c2ea7d8a..211c9eacbda6eb 100644 --- a/tools/include/uapi/asm-generic/unistd.h +++ b/tools/include/uapi/asm-generic/unistd.h @@ -207,9 +207,9 @@ __SYSCALL(__NR_read, sys_read) #define __NR_write 64 __SYSCALL(__NR_write, sys_write) #define __NR_readv 65 -__SC_COMP(__NR_readv, sys_readv, compat_sys_readv) +__SC_COMP(__NR_readv, sys_readv, sys_readv) #define __NR_writev 66 -__SC_COMP(__NR_writev, sys_writev, compat_sys_writev) +__SC_COMP(__NR_writev, sys_writev, sys_writev) #define __NR_pread64 67 __SC_COMP(__NR_pread64, sys_pread64, compat_sys_pread64) #define __NR_pwrite64 68 diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl index 3ca6fe057a0b1f..46be68029587f9 100644 --- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl @@ -189,8 +189,8 @@ 142 common _newselect sys_select compat_sys_select 143 common flock sys_flock 144 common msync sys_msync -145 common readv sys_readv compat_sys_readv -146 common writev sys_writev compat_sys_writev +145 common readv sys_readv +146 common writev sys_writev 147 common getsid sys_getsid 148 common fdatasync sys_fdatasync 149 nospu _sysctl sys_ni_syscall diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl index 6a0bbea225db0d..fb5e61ce9d5838 100644 --- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl @@ -134,8 +134,8 @@ 142 64 select sys_select - 143 common flock sys_flock sys_flock 144 common msync sys_msync compat_sys_msync -145 common readv sys_readv compat_sys_readv -146 common writev sys_writev compat_sys_writev +145 common readv sys_readv +146 common writev sys_writev 147 common getsid sys_getsid sys_getsid 148 common fdatasync sys_fdatasync sys_fdatasync 149 common _sysctl - - diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl index f30d6ae9a6883c..b1e59957c5c51c 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl @@ -371,8 +371,8 @@ 512 x32 rt_sigaction compat_sys_rt_sigaction 513 x32 rt_sigreturn compat_sys_x32_rt_sigreturn 514 x32 ioctl compat_sys_ioctl -515 x32 readv compat_sys_readv -516 x32 writev compat_sys_writev +515 x32 readv sys_readv +516 x32 writev sys_writev 517 x32 recvfrom compat_sys_recvfrom 518 x32 sendmsg compat_sys_sendmsg 519 x32 recvmsg compat_sys_recvmsg From patchwork Mon Sep 21 14:34:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 257574 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A336AC43465 for ; Mon, 21 Sep 2020 14:35:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D1B6222BB for ; Mon, 21 Sep 2020 14:35:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="qhxaSUE5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727702AbgIUOfK (ORCPT ); Mon, 21 Sep 2020 10:35:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727030AbgIUOej (ORCPT ); Mon, 21 Sep 2020 10:34:39 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6AA2C0613CF; Mon, 21 Sep 2020 07:34:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=8COumOTVJwjBOnvhf/EKCiWd6knam65WjicJMR0kLPs=; b=qhxaSUE556sNcGnGxLJvKPplKT +mDZTnAm7U09Rj15xglks90Fki5U6BE2Ep2KcMWGSahbyIqtyair6j7ayWNaJ/NaxSB+zCG3NIvIr iz1s5S451sCrnDZ53CMDGeM6426LinTEwU666tUMpgFBT8/kmmgaQ3CmFxZGc8fwaStmgu3+SdSGQ fiJQL1A1HCP92QugYrOgSCOxfePYA8YhVv/zPrY/k5Yaq1/hXtLly6aDHxldTXVLijG8YSbpx0NQB tgx2zfu5a5/MqzaO8MOQDyCOrbOH8O52TjmBsaol+gehL2d1zcoSHiaV21JdBiExoSwRuZhvzUo9Y s58ZpHlw==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtj-0007sb-4N; Mon, 21 Sep 2020 14:34:31 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 09/11] fs: remove compat_sys_vmsplice Date: Mon, 21 Sep 2020 16:34:32 +0200 Message-Id: <20200921143434.707844-10-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Now that import_iovec handles compat iovecs, the native vmsplice syscall can be used for the compat case as well. Signed-off-by: Christoph Hellwig --- arch/arm64/include/asm/unistd32.h | 2 +- arch/mips/kernel/syscalls/syscall_n32.tbl | 2 +- arch/mips/kernel/syscalls/syscall_o32.tbl | 2 +- arch/parisc/kernel/syscalls/syscall.tbl | 2 +- arch/powerpc/kernel/syscalls/syscall.tbl | 2 +- arch/s390/kernel/syscalls/syscall.tbl | 2 +- arch/sparc/kernel/syscalls/syscall.tbl | 2 +- arch/x86/entry/syscall_x32.c | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 2 +- arch/x86/entry/syscalls/syscall_64.tbl | 2 +- fs/splice.c | 57 +++++-------------- include/linux/compat.h | 4 -- include/uapi/asm-generic/unistd.h | 2 +- tools/include/uapi/asm-generic/unistd.h | 2 +- .../arch/powerpc/entry/syscalls/syscall.tbl | 2 +- .../perf/arch/s390/entry/syscalls/syscall.tbl | 2 +- .../arch/x86/entry/syscalls/syscall_64.tbl | 2 +- 17 files changed, 28 insertions(+), 62 deletions(-) diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 4a236493dca5b9..11dfae3a8563bd 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -697,7 +697,7 @@ __SYSCALL(__NR_sync_file_range2, compat_sys_aarch32_sync_file_range2) #define __NR_tee 342 __SYSCALL(__NR_tee, sys_tee) #define __NR_vmsplice 343 -__SYSCALL(__NR_vmsplice, compat_sys_vmsplice) +__SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_move_pages 344 __SYSCALL(__NR_move_pages, compat_sys_move_pages) #define __NR_getcpu 345 diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl index c99a92646f8ee9..5a39d4de0ac85b 100644 --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -278,7 +278,7 @@ 267 n32 splice sys_splice 268 n32 sync_file_range sys_sync_file_range 269 n32 tee sys_tee -270 n32 vmsplice compat_sys_vmsplice +270 n32 vmsplice sys_vmsplice 271 n32 move_pages compat_sys_move_pages 272 n32 set_robust_list compat_sys_set_robust_list 273 n32 get_robust_list compat_sys_get_robust_list diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl index 075064d10661bf..136efc6b8c5444 100644 --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -318,7 +318,7 @@ 304 o32 splice sys_splice 305 o32 sync_file_range sys_sync_file_range sys32_sync_file_range 306 o32 tee sys_tee -307 o32 vmsplice sys_vmsplice compat_sys_vmsplice +307 o32 vmsplice sys_vmsplice 308 o32 move_pages sys_move_pages compat_sys_move_pages 309 o32 set_robust_list sys_set_robust_list compat_sys_set_robust_list 310 o32 get_robust_list sys_get_robust_list compat_sys_get_robust_list diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl index 192abde0001d9d..a9e184192caedd 100644 --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -330,7 +330,7 @@ 292 32 sync_file_range parisc_sync_file_range 292 64 sync_file_range sys_sync_file_range 293 common tee sys_tee -294 common vmsplice sys_vmsplice compat_sys_vmsplice +294 common vmsplice sys_vmsplice 295 common move_pages sys_move_pages compat_sys_move_pages 296 common getcpu sys_getcpu 297 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl index 6f1e2ecf0edad9..0d4985919ca34d 100644 --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -369,7 +369,7 @@ 282 common unshare sys_unshare 283 common splice sys_splice 284 common tee sys_tee -285 common vmsplice sys_vmsplice compat_sys_vmsplice +285 common vmsplice sys_vmsplice 286 common openat sys_openat compat_sys_openat 287 common mkdirat sys_mkdirat 288 common mknodat sys_mknodat diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl index 6101cf2e004cb4..b5495a42814bd1 100644 --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -316,7 +316,7 @@ 306 common splice sys_splice sys_splice 307 common sync_file_range sys_sync_file_range compat_sys_s390_sync_file_range 308 common tee sys_tee sys_tee -309 common vmsplice sys_vmsplice compat_sys_vmsplice +309 common vmsplice sys_vmsplice sys_vmsplice 310 common move_pages sys_move_pages compat_sys_move_pages 311 common getcpu sys_getcpu sys_getcpu 312 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl index a87ddb282ab16f..f1810c1a35caa5 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -38,7 +38,7 @@ 23 64 setuid sys_setuid 24 32 getuid sys_getuid16 24 64 getuid sys_getuid -25 common vmsplice sys_vmsplice compat_sys_vmsplice +25 common vmsplice sys_vmsplice 26 common ptrace sys_ptrace compat_sys_ptrace 27 common alarm sys_alarm 28 common sigaltstack sys_sigaltstack compat_sys_sigaltstack diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c index aa321444a41f63..a4840b9d50ad14 100644 --- a/arch/x86/entry/syscall_x32.c +++ b/arch/x86/entry/syscall_x32.c @@ -16,6 +16,7 @@ #define __x32_sys_writev __x64_sys_writev #define __x32_sys_getsockopt __x64_sys_getsockopt #define __x32_sys_setsockopt __x64_sys_setsockopt +#define __x32_sys_vmsplice __x64_sys_vmsplice #define __SYSCALL_64(nr, sym) diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 54ab4beb517f25..0fb2f172581e51 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -327,7 +327,7 @@ 313 i386 splice sys_splice 314 i386 sync_file_range sys_ia32_sync_file_range 315 i386 tee sys_tee -316 i386 vmsplice sys_vmsplice compat_sys_vmsplice +316 i386 vmsplice sys_vmsplice 317 i386 move_pages sys_move_pages compat_sys_move_pages 318 i386 getcpu sys_getcpu 319 i386 epoll_pwait sys_epoll_pwait diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index b1e59957c5c51c..642af919183de4 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -388,7 +388,7 @@ 529 x32 waitid compat_sys_waitid 530 x32 set_robust_list compat_sys_set_robust_list 531 x32 get_robust_list compat_sys_get_robust_list -532 x32 vmsplice compat_sys_vmsplice +532 x32 vmsplice sys_vmsplice 533 x32 move_pages compat_sys_move_pages 534 x32 preadv compat_sys_preadv64 535 x32 pwritev compat_sys_pwritev64 diff --git a/fs/splice.c b/fs/splice.c index 132d42b9871f9b..18d84544030b39 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -33,7 +33,6 @@ #include #include #include -#include #include #include "internal.h" @@ -1332,20 +1331,6 @@ static int vmsplice_type(struct fd f, int *type) * Currently we punt and implement it as a normal copy, see pipe_to_user(). * */ -static long do_vmsplice(struct file *f, struct iov_iter *iter, unsigned int flags) -{ - if (unlikely(flags & ~SPLICE_F_ALL)) - return -EINVAL; - - if (!iov_iter_count(iter)) - return 0; - - if (iov_iter_rw(iter) == WRITE) - return vmsplice_to_pipe(f, iter, flags); - else - return vmsplice_to_user(f, iter, flags); -} - SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov, unsigned long, nr_segs, unsigned int, flags) { @@ -1356,6 +1341,9 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov, struct fd f; int type; + if (unlikely(flags & ~SPLICE_F_ALL)) + return -EINVAL; + f = fdget(fd); error = vmsplice_type(f, &type); if (error) @@ -1363,40 +1351,21 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov, error = import_iovec(type, uiov, nr_segs, ARRAY_SIZE(iovstack), &iov, &iter); - if (error >= 0) { - error = do_vmsplice(f.file, &iter, flags); - kfree(iov); - } - fdput(f); - return error; -} + if (error < 0) + goto out_fdput; -#ifdef CONFIG_COMPAT -COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32, - unsigned int, nr_segs, unsigned int, flags) -{ - struct iovec iovstack[UIO_FASTIOV]; - struct iovec *iov = iovstack; - struct iov_iter iter; - ssize_t error; - struct fd f; - int type; - - f = fdget(fd); - error = vmsplice_type(f, &type); - if (error) - return error; + if (!iov_iter_count(&iter)) + error = 0; + else if (iov_iter_rw(&iter) == WRITE) + error = vmsplice_to_pipe(f.file, &iter, flags); + else + error = vmsplice_to_user(f.file, &iter, flags); - error = import_iovec(type, (struct iovec __user *)iov32, nr_segs, - ARRAY_SIZE(iovstack), &iov, &iter); - if (error >= 0) { - error = do_vmsplice(f.file, &iter, flags); - kfree(iov); - } + kfree(iov); +out_fdput: fdput(f); return error; } -#endif SYSCALL_DEFINE6(splice, int, fd_in, loff_t __user *, off_in, int, fd_out, loff_t __user *, off_out, diff --git a/include/linux/compat.h b/include/linux/compat.h index fa39b7a5488d70..14d8bf412bd02e 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -597,10 +597,6 @@ asmlinkage long compat_sys_signalfd4(int ufd, const compat_sigset_t __user *sigmask, compat_size_t sigsetsize, int flags); -/* fs/splice.c */ -asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *, - unsigned int nr_segs, unsigned int flags); - /* fs/stat.c */ asmlinkage long compat_sys_newfstatat(unsigned int dfd, const char __user *filename, diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index 211c9eacbda6eb..f2dcb0d5703014 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -237,7 +237,7 @@ __SC_COMP(__NR_signalfd4, sys_signalfd4, compat_sys_signalfd4) /* fs/splice.c */ #define __NR_vmsplice 75 -__SC_COMP(__NR_vmsplice, sys_vmsplice, compat_sys_vmsplice) +__SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_splice 76 __SYSCALL(__NR_splice, sys_splice) #define __NR_tee 77 diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h index 211c9eacbda6eb..f2dcb0d5703014 100644 --- a/tools/include/uapi/asm-generic/unistd.h +++ b/tools/include/uapi/asm-generic/unistd.h @@ -237,7 +237,7 @@ __SC_COMP(__NR_signalfd4, sys_signalfd4, compat_sys_signalfd4) /* fs/splice.c */ #define __NR_vmsplice 75 -__SC_COMP(__NR_vmsplice, sys_vmsplice, compat_sys_vmsplice) +__SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_splice 76 __SYSCALL(__NR_splice, sys_splice) #define __NR_tee 77 diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl index 46be68029587f9..26f0347c15118b 100644 --- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl @@ -363,7 +363,7 @@ 282 common unshare sys_unshare 283 common splice sys_splice 284 common tee sys_tee -285 common vmsplice sys_vmsplice compat_sys_vmsplice +285 common vmsplice sys_vmsplice 286 common openat sys_openat compat_sys_openat 287 common mkdirat sys_mkdirat 288 common mknodat sys_mknodat diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl index fb5e61ce9d5838..02ad81f69bb7e3 100644 --- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl @@ -316,7 +316,7 @@ 306 common splice sys_splice compat_sys_splice 307 common sync_file_range sys_sync_file_range compat_sys_s390_sync_file_range 308 common tee sys_tee compat_sys_tee -309 common vmsplice sys_vmsplice compat_sys_vmsplice +309 common vmsplice sys_vmsplice sys_vmsplice 310 common move_pages sys_move_pages compat_sys_move_pages 311 common getcpu sys_getcpu compat_sys_getcpu 312 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl index b1e59957c5c51c..642af919183de4 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl @@ -388,7 +388,7 @@ 529 x32 waitid compat_sys_waitid 530 x32 set_robust_list compat_sys_set_robust_list 531 x32 get_robust_list compat_sys_get_robust_list -532 x32 vmsplice compat_sys_vmsplice +532 x32 vmsplice sys_vmsplice 533 x32 move_pages compat_sys_move_pages 534 x32 preadv compat_sys_preadv64 535 x32 pwritev compat_sys_pwritev64 From patchwork Mon Sep 21 14:34:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 296708 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: 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DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=ShHDfKSHvkRkTEaa8JP/gWqoP0fP7YG7WDt5YzHhzPQ=; b=rHjk7FkDw/U8AF6E/h0jmVYVhG fDUwQb4ZV8viiDh/d7/0l6Ski8Nwuzrmj4gfYwiDj83RWZ6+Z7Aqy4/R+Oi6Axgxo5zNf+z6WaFLp /9De2H+nHnFhml3qDeoqbDcMDxFvANOd+naev1BMam2kUFoFrwn25Rxihh45aFs0tfAGAbDDxtgno g2MvRkrpBvvQXlRIZd+18fRIwxfcYbw/efgOdymwecG02ruloXENuQTwskX8tP2iPrhmbwXetxSWi DOLdiQAUB099ddx3KRIY2qQOhkFDyjoJa9kAoTp9zLPS0RUWovvWZd5kAnXFryfailzRf4ZLRHPTT IbzV2DYA==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtk-0007t4-Ki; Mon, 21 Sep 2020 14:34:33 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 10/11] mm: remove compat_process_vm_{readv,writev} Date: Mon, 21 Sep 2020 16:34:33 +0200 Message-Id: <20200921143434.707844-11-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Now that import_iovec handles compat iovecs, the native syscalls can be used for the compat case as well. Signed-off-by: Christoph Hellwig --- arch/arm64/include/asm/unistd32.h | 4 +- arch/mips/kernel/syscalls/syscall_n32.tbl | 4 +- arch/mips/kernel/syscalls/syscall_o32.tbl | 4 +- arch/parisc/kernel/syscalls/syscall.tbl | 4 +- arch/powerpc/kernel/syscalls/syscall.tbl | 4 +- arch/s390/kernel/syscalls/syscall.tbl | 4 +- arch/sparc/kernel/syscalls/syscall.tbl | 4 +- arch/x86/entry/syscall_x32.c | 2 + arch/x86/entry/syscalls/syscall_32.tbl | 4 +- arch/x86/entry/syscalls/syscall_64.tbl | 4 +- include/linux/compat.h | 8 --- include/uapi/asm-generic/unistd.h | 6 +- mm/process_vm_access.c | 71 ------------------- tools/include/uapi/asm-generic/unistd.h | 6 +- .../arch/powerpc/entry/syscalls/syscall.tbl | 4 +- .../perf/arch/s390/entry/syscalls/syscall.tbl | 4 +- .../arch/x86/entry/syscalls/syscall_64.tbl | 4 +- 17 files changed, 30 insertions(+), 111 deletions(-) diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 11dfae3a8563bd..0c280a05f699bf 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -763,9 +763,9 @@ __SYSCALL(__NR_sendmmsg, compat_sys_sendmmsg) #define __NR_setns 375 __SYSCALL(__NR_setns, sys_setns) #define __NR_process_vm_readv 376 -__SYSCALL(__NR_process_vm_readv, compat_sys_process_vm_readv) +__SYSCALL(__NR_process_vm_readv, sys_process_vm_readv) #define __NR_process_vm_writev 377 -__SYSCALL(__NR_process_vm_writev, compat_sys_process_vm_writev) +__SYSCALL(__NR_process_vm_writev, sys_process_vm_writev) #define __NR_kcmp 378 __SYSCALL(__NR_kcmp, sys_kcmp) #define __NR_finit_module 379 diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl index 5a39d4de0ac85b..0bc2e0fcf1ee56 100644 --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -317,8 +317,8 @@ 306 n32 syncfs sys_syncfs 307 n32 sendmmsg compat_sys_sendmmsg 308 n32 setns sys_setns -309 n32 process_vm_readv compat_sys_process_vm_readv -310 n32 process_vm_writev compat_sys_process_vm_writev +309 n32 process_vm_readv sys_process_vm_readv +310 n32 process_vm_writev sys_process_vm_writev 311 n32 kcmp sys_kcmp 312 n32 finit_module sys_finit_module 313 n32 sched_setattr sys_sched_setattr diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl index 136efc6b8c5444..b408c13b934296 100644 --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -356,8 +356,8 @@ 342 o32 syncfs sys_syncfs 343 o32 sendmmsg sys_sendmmsg compat_sys_sendmmsg 344 o32 setns sys_setns -345 o32 process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -346 o32 process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +345 o32 process_vm_readv sys_process_vm_readv +346 o32 process_vm_writev sys_process_vm_writev 347 o32 kcmp sys_kcmp 348 o32 finit_module sys_finit_module 349 o32 sched_setattr sys_sched_setattr diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl index a9e184192caedd..2015a5124b78ad 100644 --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -372,8 +372,8 @@ 327 common syncfs sys_syncfs 328 common setns sys_setns 329 common sendmmsg sys_sendmmsg compat_sys_sendmmsg -330 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -331 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +330 common process_vm_readv sys_process_vm_readv +331 common process_vm_writev sys_process_vm_writev 332 common kcmp sys_kcmp 333 common finit_module sys_finit_module 334 common sched_setattr sys_sched_setattr diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl index 0d4985919ca34d..66a472aa635d3f 100644 --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -449,8 +449,8 @@ 348 common syncfs sys_syncfs 349 common sendmmsg sys_sendmmsg compat_sys_sendmmsg 350 common setns sys_setns -351 nospu process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -352 nospu process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +351 nospu process_vm_readv sys_process_vm_readv +352 nospu process_vm_writev sys_process_vm_writev 353 nospu finit_module sys_finit_module 354 nospu kcmp sys_kcmp 355 common sched_setattr sys_sched_setattr diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl index b5495a42814bd1..7485867a490bb2 100644 --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -347,8 +347,8 @@ 337 common clock_adjtime sys_clock_adjtime sys_clock_adjtime32 338 common syncfs sys_syncfs sys_syncfs 339 common setns sys_setns sys_setns -340 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -341 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +340 common process_vm_readv sys_process_vm_readv sys_process_vm_readv +341 common process_vm_writev sys_process_vm_writev sys_process_vm_writev 342 common s390_runtime_instr sys_s390_runtime_instr sys_s390_runtime_instr 343 common kcmp sys_kcmp sys_kcmp 344 common finit_module sys_finit_module sys_finit_module diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl index f1810c1a35caa5..4a9365b2e340b2 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -406,8 +406,8 @@ 335 common syncfs sys_syncfs 336 common sendmmsg sys_sendmmsg compat_sys_sendmmsg 337 common setns sys_setns -338 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -339 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +338 common process_vm_readv sys_process_vm_readv +339 common process_vm_writev sys_process_vm_writev 340 32 kern_features sys_ni_syscall sys_kern_features 340 64 kern_features sys_kern_features 341 common kcmp sys_kcmp diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c index a4840b9d50ad14..f2fe0a33bcfdd5 100644 --- a/arch/x86/entry/syscall_x32.c +++ b/arch/x86/entry/syscall_x32.c @@ -17,6 +17,8 @@ #define __x32_sys_getsockopt __x64_sys_getsockopt #define __x32_sys_setsockopt __x64_sys_setsockopt #define __x32_sys_vmsplice __x64_sys_vmsplice +#define __x32_sys_process_vm_readv __x64_sys_process_vm_readv +#define __x32_sys_process_vm_writev __x64_sys_process_vm_writev #define __SYSCALL_64(nr, sym) diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index 0fb2f172581e51..5fbe10ad8a23fc 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -358,8 +358,8 @@ 344 i386 syncfs sys_syncfs 345 i386 sendmmsg sys_sendmmsg compat_sys_sendmmsg 346 i386 setns sys_setns -347 i386 process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -348 i386 process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +347 i386 process_vm_readv sys_process_vm_readv +348 i386 process_vm_writev sys_process_vm_writev 349 i386 kcmp sys_kcmp 350 i386 finit_module sys_finit_module 351 i386 sched_setattr sys_sched_setattr diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 642af919183de4..347809649ba28f 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -395,8 +395,8 @@ 536 x32 rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo 537 x32 recvmmsg compat_sys_recvmmsg_time64 538 x32 sendmmsg compat_sys_sendmmsg -539 x32 process_vm_readv compat_sys_process_vm_readv -540 x32 process_vm_writev compat_sys_process_vm_writev +539 x32 process_vm_readv sys_process_vm_readv +540 x32 process_vm_writev sys_process_vm_writev 541 x32 setsockopt sys_setsockopt 542 x32 getsockopt sys_getsockopt 543 x32 io_setup compat_sys_io_setup diff --git a/include/linux/compat.h b/include/linux/compat.h index 14d8bf412bd02e..d46e5905970817 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -780,14 +780,6 @@ asmlinkage long compat_sys_open_by_handle_at(int mountdirfd, int flags); asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, unsigned vlen, unsigned int flags); -asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid, - const struct compat_iovec __user *lvec, - compat_ulong_t liovcnt, const struct compat_iovec __user *rvec, - compat_ulong_t riovcnt, compat_ulong_t flags); -asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid, - const struct compat_iovec __user *lvec, - compat_ulong_t liovcnt, const struct compat_iovec __user *rvec, - compat_ulong_t riovcnt, compat_ulong_t flags); asmlinkage long compat_sys_execveat(int dfd, const char __user *filename, const compat_uptr_t __user *argv, const compat_uptr_t __user *envp, int flags); diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index f2dcb0d5703014..c1dfe99c9c3f70 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -727,11 +727,9 @@ __SYSCALL(__NR_setns, sys_setns) #define __NR_sendmmsg 269 __SC_COMP(__NR_sendmmsg, sys_sendmmsg, compat_sys_sendmmsg) #define __NR_process_vm_readv 270 -__SC_COMP(__NR_process_vm_readv, sys_process_vm_readv, \ - compat_sys_process_vm_readv) +__SYSCALL(__NR_process_vm_readv, sys_process_vm_readv) #define __NR_process_vm_writev 271 -__SC_COMP(__NR_process_vm_writev, sys_process_vm_writev, \ - compat_sys_process_vm_writev) +__SYSCALL(__NR_process_vm_writev, sys_process_vm_writev) #define __NR_kcmp 272 __SYSCALL(__NR_kcmp, sys_kcmp) #define __NR_finit_module 273 diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index b759ed264840d8..a5f49ae45643fc 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -14,10 +14,6 @@ #include #include -#ifdef CONFIG_COMPAT -#include -#endif - /** * process_vm_rw_pages - read/write pages from task specified * @pages: array of pointers to pages we want to copy @@ -309,70 +305,3 @@ SYSCALL_DEFINE6(process_vm_writev, pid_t, pid, { return process_vm_rw(pid, lvec, liovcnt, rvec, riovcnt, flags, 1); } - -#ifdef CONFIG_COMPAT - -static ssize_t -compat_process_vm_rw(compat_pid_t pid, - const struct compat_iovec __user *lvec, - unsigned long liovcnt, - const struct compat_iovec __user *rvec, - unsigned long riovcnt, - unsigned long flags, int vm_write) -{ - struct iovec iovstack_l[UIO_FASTIOV]; - struct iovec iovstack_r[UIO_FASTIOV]; - struct iovec *iov_l = iovstack_l; - struct iovec *iov_r = iovstack_r; - struct iov_iter iter_l, iter_r; - ssize_t rc = -EFAULT; - int dir = vm_write ? WRITE : READ; - - if (flags != 0) - return -EINVAL; - - rc = import_iovec(dir, (const struct iovec __user *)iov_l, liovcnt, - UIO_FASTIOV, &iov_l, &iter_l); - if (rc < 0) - return rc; - if (!iov_iter_count(&iter_l)) - goto free_iovecs; - rc = import_iovec(CHECK_IOVEC_ONLY, iov_r, riovcnt, UIO_FASTIOV, &iov_r, - &iter_r); - if (rc <= 0) - goto free_iovecs; - - rc = process_vm_rw_core(pid, &iter_l, iter_r.iov, iter_r.nr_segs, - flags, vm_write); - -free_iovecs: - if (iov_r != iovstack_r) - kfree(iov_r); - if (iov_l != iovstack_l) - kfree(iov_l); - return rc; -} - -COMPAT_SYSCALL_DEFINE6(process_vm_readv, compat_pid_t, pid, - const struct compat_iovec __user *, lvec, - compat_ulong_t, liovcnt, - const struct compat_iovec __user *, rvec, - compat_ulong_t, riovcnt, - compat_ulong_t, flags) -{ - return compat_process_vm_rw(pid, lvec, liovcnt, rvec, - riovcnt, flags, 0); -} - -COMPAT_SYSCALL_DEFINE6(process_vm_writev, compat_pid_t, pid, - const struct compat_iovec __user *, lvec, - compat_ulong_t, liovcnt, - const struct compat_iovec __user *, rvec, - compat_ulong_t, riovcnt, - compat_ulong_t, flags) -{ - return compat_process_vm_rw(pid, lvec, liovcnt, rvec, - riovcnt, flags, 1); -} - -#endif diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h index f2dcb0d5703014..c1dfe99c9c3f70 100644 --- a/tools/include/uapi/asm-generic/unistd.h +++ b/tools/include/uapi/asm-generic/unistd.h @@ -727,11 +727,9 @@ __SYSCALL(__NR_setns, sys_setns) #define __NR_sendmmsg 269 __SC_COMP(__NR_sendmmsg, sys_sendmmsg, compat_sys_sendmmsg) #define __NR_process_vm_readv 270 -__SC_COMP(__NR_process_vm_readv, sys_process_vm_readv, \ - compat_sys_process_vm_readv) +__SYSCALL(__NR_process_vm_readv, sys_process_vm_readv) #define __NR_process_vm_writev 271 -__SC_COMP(__NR_process_vm_writev, sys_process_vm_writev, \ - compat_sys_process_vm_writev) +__SYSCALL(__NR_process_vm_writev, sys_process_vm_writev) #define __NR_kcmp 272 __SYSCALL(__NR_kcmp, sys_kcmp) #define __NR_finit_module 273 diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl index 26f0347c15118b..a188f053cbf90a 100644 --- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl @@ -443,8 +443,8 @@ 348 common syncfs sys_syncfs 349 common sendmmsg sys_sendmmsg compat_sys_sendmmsg 350 common setns sys_setns -351 nospu process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -352 nospu process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +351 nospu process_vm_readv sys_process_vm_readv +352 nospu process_vm_writev sys_process_vm_writev 353 nospu finit_module sys_finit_module 354 nospu kcmp sys_kcmp 355 common sched_setattr sys_sched_setattr diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl index 02ad81f69bb7e3..c44c83032c3a04 100644 --- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl @@ -347,8 +347,8 @@ 337 common clock_adjtime sys_clock_adjtime compat_sys_clock_adjtime 338 common syncfs sys_syncfs sys_syncfs 339 common setns sys_setns sys_setns -340 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv -341 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +340 common process_vm_readv sys_process_vm_readv sys_process_vm_readv +341 common process_vm_writev sys_process_vm_writev sys_process_vm_writev 342 common s390_runtime_instr sys_s390_runtime_instr sys_s390_runtime_instr 343 common kcmp sys_kcmp compat_sys_kcmp 344 common finit_module sys_finit_module compat_sys_finit_module diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl index 642af919183de4..347809649ba28f 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl @@ -395,8 +395,8 @@ 536 x32 rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo 537 x32 recvmmsg compat_sys_recvmmsg_time64 538 x32 sendmmsg compat_sys_sendmmsg -539 x32 process_vm_readv compat_sys_process_vm_readv -540 x32 process_vm_writev compat_sys_process_vm_writev +539 x32 process_vm_readv sys_process_vm_readv +540 x32 process_vm_writev sys_process_vm_writev 541 x32 setsockopt sys_setsockopt 542 x32 getsockopt sys_getsockopt 543 x32 io_setup compat_sys_io_setup From patchwork Mon Sep 21 14:34:34 2020 Content-Type: text/plain; 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Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtm-0007tU-EZ; Mon, 21 Sep 2020 14:34:34 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 11/11] security/keys: remove compat_keyctl_instantiate_key_iov Date: Mon, 21 Sep 2020 16:34:34 +0200 Message-Id: <20200921143434.707844-12-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Now that import_iovec handles compat iovecs, the native version of keyctl_instantiate_key_iov can be used for the compat case as well. Signed-off-by: Christoph Hellwig --- security/keys/compat.c | 36 ++---------------------------------- security/keys/internal.h | 5 ----- security/keys/keyctl.c | 2 +- 3 files changed, 3 insertions(+), 40 deletions(-) diff --git a/security/keys/compat.c b/security/keys/compat.c index 7ae531db031cf8..1545efdca56227 100644 --- a/security/keys/compat.c +++ b/security/keys/compat.c @@ -11,38 +11,6 @@ #include #include "internal.h" -/* - * Instantiate a key with the specified compatibility multipart payload and - * link the key into the destination keyring if one is given. - * - * The caller must have the appropriate instantiation permit set for this to - * work (see keyctl_assume_authority). No other permissions are required. - * - * If successful, 0 will be returned. - */ -static long compat_keyctl_instantiate_key_iov( - key_serial_t id, - const struct compat_iovec __user *_payload_iov, - unsigned ioc, - key_serial_t ringid) -{ - struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; - struct iov_iter from; - long ret; - - if (!_payload_iov) - ioc = 0; - - ret = import_iovec(WRITE, (const struct iovec __user *)_payload_iov, - ioc, ARRAY_SIZE(iovstack), &iov, &from); - if (ret < 0) - return ret; - - ret = keyctl_instantiate_key_common(id, &from, ringid); - kfree(iov); - return ret; -} - /* * The key control system call, 32-bit compatibility version for 64-bit archs */ @@ -113,8 +81,8 @@ COMPAT_SYSCALL_DEFINE5(keyctl, u32, option, return keyctl_reject_key(arg2, arg3, arg4, arg5); case KEYCTL_INSTANTIATE_IOV: - return compat_keyctl_instantiate_key_iov( - arg2, compat_ptr(arg3), arg4, arg5); + return keyctl_instantiate_key_iov(arg2, compat_ptr(arg3), arg4, + arg5); case KEYCTL_INVALIDATE: return keyctl_invalidate_key(arg2); diff --git a/security/keys/internal.h b/security/keys/internal.h index 338a526cbfa516..9b9cf3b6fcbb4d 100644 --- a/security/keys/internal.h +++ b/security/keys/internal.h @@ -262,11 +262,6 @@ extern long keyctl_instantiate_key_iov(key_serial_t, const struct iovec __user *, unsigned, key_serial_t); extern long keyctl_invalidate_key(key_serial_t); - -struct iov_iter; -extern long keyctl_instantiate_key_common(key_serial_t, - struct iov_iter *, - key_serial_t); extern long keyctl_restrict_keyring(key_serial_t id, const char __user *_type, const char __user *_restriction); diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 9febd37a168fd0..e26bbccda7ccee 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -1164,7 +1164,7 @@ static int keyctl_change_reqkey_auth(struct key *key) * * If successful, 0 will be returned. */ -long keyctl_instantiate_key_common(key_serial_t id, +static long keyctl_instantiate_key_common(key_serial_t id, struct iov_iter *from, key_serial_t ringid) {