From patchwork Tue Aug 17 15:45:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislav Fomichev X-Patchwork-Id: 499641 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 CDD4DC4320A for ; Tue, 17 Aug 2021 15:46:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B613560FD7 for ; Tue, 17 Aug 2021 15:46:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237624AbhHQPqh (ORCPT ); Tue, 17 Aug 2021 11:46:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237594AbhHQPqf (ORCPT ); Tue, 17 Aug 2021 11:46:35 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF55BC0613C1 for ; Tue, 17 Aug 2021 08:46:01 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id f8-20020a2585480000b02905937897e3daso20639256ybn.2 for ; Tue, 17 Aug 2021 08:46:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=lNhDLK5X+HI8/KKYOncoy8HlwWwZCMsAcseeTB6ZMlU=; b=noFiPtuxPimiZMlQhYytzSBx9S5waYGbZfSUcfUd67xPDodjI20APHtg1JLdEUNxG+ 727Ia59qnZatVBratAICxwalBwTUU3ZE6avj5O9vAVPE/vHRpF+61qJiJ9qx9Ku6gQkH DbO8n4s4sCgjTmmxl+xDZWiW8cG+32xzvleTSGsxuVTN+iJLN3svBFp5XlunmRH3AZo3 tNGyeCNS1QKEPLYblqy2tMLETSEl3CIIFkFWHup2Dwg5/DgcHXD73bkMdhBixp6Xtx8X l/+ZOt8pa5gEIt5nCpBSOEKLSUrwGSaqEF1SDwsv+zLviqpKGTmVxsopmrkgBv+4QMdG Bceg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=lNhDLK5X+HI8/KKYOncoy8HlwWwZCMsAcseeTB6ZMlU=; b=p7oVhilfjGyDK1R28w4d0n4XnVLXCif0Eb7vLCthgJ3JFbZw+rG8Tv39q43I5ytula f2QoS0/eup3FHGPhuCn+WUYLTDWBt5WCw0Hxo+MZ7vhcsQgvzxx5AmuaBdmPuyWenqyX AP3q6vVchulR926ODB0Ax14kvhUlWdE/ExoitEnzzghrY1xtixl8w24nt4tAC7+IQD0g OoDgmNCLY3eDaR1SLUtCi3OiGapC5s8fEjjOe/lXY7Xg/ZdPFbBYG4+9aa5TckYeXdjq nI3MwGoHbo7QoGap9CpHaKuaviCcX0KylNpvr/7zRt3lZafYH06enct3BUUhsDlSz6iX EErA== X-Gm-Message-State: AOAM5333d8bLrt+vP/iFgtovFYs3zrEaT77HX1qi1hzmi0I2UqGnAYG9 8AEGPIAq/rpXYFNES/KdbuHGYBp5CNg6TIksbPc8EBqpqVsdMNuoIZlEzxHszPOenfSx+e8od6n ZpSZMF9M4rz3+Un9GMB3U9eQW4dn3AcjLu9wVhaOC1cOdmJEuiugEvQ== X-Google-Smtp-Source: ABdhPJxOFj1wgxv+4Heod5c/Rr5pLLl0Gbx15EsbHA1TETxlbWC+9LuVFN0Pt+/VLD9x9bRtooZUF0A= X-Received: from sdf2.svl.corp.google.com ([2620:15c:2c4:201:e3f2:64ab:dda:c30f]) (user=sdf job=sendgmr) by 2002:a25:764e:: with SMTP id r75mr5021506ybc.263.1629215161138; Tue, 17 Aug 2021 08:46:01 -0700 (PDT) Date: Tue, 17 Aug 2021 08:45:56 -0700 In-Reply-To: <20210817154556.92901-1-sdf@google.com> Message-Id: <20210817154556.92901-2-sdf@google.com> Mime-Version: 1.0 References: <20210817154556.92901-1-sdf@google.com> X-Mailer: git-send-email 2.33.0.rc1.237.g0d66db33f3-goog Subject: [PATCH bpf-next v2 2/2] bpf: use kvmalloc for map keys in syscalls From: Stanislav Fomichev To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, Stanislav Fomichev Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Same as previous patch but for the keys. memdup_bpfptr is renamed to vmemdup_bpfptr (and converted to kvmalloc). Signed-off-by: Stanislav Fomichev --- include/linux/bpfptr.h | 12 ++++++++++-- kernel/bpf/syscall.c | 34 +++++++++++++++++----------------- 2 files changed, 27 insertions(+), 19 deletions(-) diff --git a/include/linux/bpfptr.h b/include/linux/bpfptr.h index 5cdeab497cb3..84eeffb4316a 100644 --- a/include/linux/bpfptr.h +++ b/include/linux/bpfptr.h @@ -62,9 +62,17 @@ static inline int copy_to_bpfptr_offset(bpfptr_t dst, size_t offset, return copy_to_sockptr_offset((sockptr_t) dst, offset, src, size); } -static inline void *memdup_bpfptr(bpfptr_t src, size_t len) +static inline void *vmemdup_bpfptr(bpfptr_t src, size_t len) { - return memdup_sockptr((sockptr_t) src, len); + void *p = kvmalloc(len, GFP_USER | __GFP_NOWARN); + + if (!p) + return ERR_PTR(-ENOMEM); + if (copy_from_sockptr(p, (sockptr_t) src, len)) { + kvfree(p); + return ERR_PTR(-EFAULT); + } + return p; } static inline long strncpy_from_bpfptr(char *dst, bpfptr_t src, size_t count) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 075f650d297a..ac230f4234cd 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1013,7 +1013,7 @@ int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) static void *__bpf_copy_key(void __user *ukey, u64 key_size) { if (key_size) - return memdup_user(ukey, key_size); + return vmemdup_user(ukey, key_size); if (ukey) return ERR_PTR(-EINVAL); @@ -1024,7 +1024,7 @@ static void *__bpf_copy_key(void __user *ukey, u64 key_size) static void *___bpf_copy_key(bpfptr_t ukey, u64 key_size) { if (key_size) - return memdup_bpfptr(ukey, key_size); + return vmemdup_bpfptr(ukey, key_size); if (!bpfptr_is_null(ukey)) return ERR_PTR(-EINVAL); @@ -1093,7 +1093,7 @@ static int map_lookup_elem(union bpf_attr *attr) free_value: kvfree(value); free_key: - kfree(key); + kvfree(key); err_put: fdput(f); return err; @@ -1153,7 +1153,7 @@ static int map_update_elem(union bpf_attr *attr, bpfptr_t uattr) free_value: kvfree(value); free_key: - kfree(key); + kvfree(key); err_put: fdput(f); return err; @@ -1205,7 +1205,7 @@ static int map_delete_elem(union bpf_attr *attr) bpf_enable_instrumentation(); maybe_wait_bpf_programs(map); out: - kfree(key); + kvfree(key); err_put: fdput(f); return err; @@ -1247,7 +1247,7 @@ static int map_get_next_key(union bpf_attr *attr) } err = -ENOMEM; - next_key = kmalloc(map->key_size, GFP_USER); + next_key = kvmalloc(map->key_size, GFP_USER); if (!next_key) goto free_key; @@ -1270,9 +1270,9 @@ static int map_get_next_key(union bpf_attr *attr) err = 0; free_next_key: - kfree(next_key); + kvfree(next_key); free_key: - kfree(key); + kvfree(key); err_put: fdput(f); return err; @@ -1299,7 +1299,7 @@ int generic_map_delete_batch(struct bpf_map *map, if (!max_count) return 0; - key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN); + key = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN); if (!key) return -ENOMEM; @@ -1326,7 +1326,7 @@ int generic_map_delete_batch(struct bpf_map *map, if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp))) err = -EFAULT; - kfree(key); + kvfree(key); return err; } @@ -1357,13 +1357,13 @@ int generic_map_update_batch(struct bpf_map *map, if (!max_count) return 0; - key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN); + key = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN); if (!key) return -ENOMEM; value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN); if (!value) { - kfree(key); + kvfree(key); return -ENOMEM; } @@ -1385,7 +1385,7 @@ int generic_map_update_batch(struct bpf_map *map, err = -EFAULT; kvfree(value); - kfree(key); + kvfree(key); return err; } @@ -1419,13 +1419,13 @@ int generic_map_lookup_batch(struct bpf_map *map, if (put_user(0, &uattr->batch.count)) return -EFAULT; - buf_prevkey = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN); + buf_prevkey = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN); if (!buf_prevkey) return -ENOMEM; buf = kvmalloc(map->key_size + value_size, GFP_USER | __GFP_NOWARN); if (!buf) { - kfree(buf_prevkey); + kvfree(buf_prevkey); return -ENOMEM; } @@ -1485,7 +1485,7 @@ int generic_map_lookup_batch(struct bpf_map *map, err = -EFAULT; free_buf: - kfree(buf_prevkey); + kvfree(buf_prevkey); kvfree(buf); return err; } @@ -1575,7 +1575,7 @@ static int map_lookup_and_delete_elem(union bpf_attr *attr) free_value: kvfree(value); free_key: - kfree(key); + kvfree(key); err_put: fdput(f); return err;