From patchwork Fri Dec 23 09:27:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 636334 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B10BC3DA7A for ; Fri, 23 Dec 2022 09:27:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236183AbiLWJ1Y (ORCPT ); Fri, 23 Dec 2022 04:27:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236197AbiLWJ1U (ORCPT ); Fri, 23 Dec 2022 04:27:20 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D301E3720E; Fri, 23 Dec 2022 01:27:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=uj5J1LKb/4UIpagExHs49WqhLRVbYSUrTZ0b+D0WTrE=; b=nIi94Z7xg6PPdFGLsL4tc1cRkg fk8vpDY3Qb3un4xD1x2lRvrSE26lm0N2VFu2vOaxEEGO0wHPAN1Yxwhvxql+tye9eIB5BRKK8X8XV qanYlBggDmH2iPfyygKTQw+sRmJFClDwKQ2kuS5u26BxfEccIXUncjf++Bd5jYUx+wbGGQKfYdk4c 7/mdYbO9Mwpwbfp/CjA+1UI4MNSaFjOBU4i6+PdCtDeRCOcmkq8GcN830iPnmFv/pc+vl/vmUZblo TDK7c8vj1Clg2JWlevxJIVFeIehSHNSv5VExgK9skZq/Qyl4aoiTv6ZetYah0ZlvZ0ESd3tYFwVPO Judum79A==; Received: from [2001:4bb8:199:7829:8d88:c8b3:6416:2f03] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1p8eKe-005hTn-Jv; Fri, 23 Dec 2022 09:27:13 +0000 From: Christoph Hellwig To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Mathieu Poirier , Andrew Morton , Uladzislau Rezki Cc: linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux.dev Subject: [PATCH 2/2] vmalloc: reject vmap with VM_FLUSH_RESET_PERMS Date: Fri, 23 Dec 2022 10:27:03 +0100 Message-Id: <20221223092703.61927-3-hch@lst.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221223092703.61927-1-hch@lst.de> References: <20221223092703.61927-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org VM_FLUSH_RESET_PERMS is just for use with vmalloc as it is tied to freeing the underlying pages. Signed-off-by: Christoph Hellwig --- mm/vmalloc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 9e30f0b3920325..88a644cde9fb12 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2849,6 +2849,9 @@ void *vmap(struct page **pages, unsigned int count, might_sleep(); + if (WARN_ON_ONCE(flags & VM_FLUSH_RESET_PERMS)) + return NULL; + /* * Your top guard is someone else's bottom guard. Not having a top * guard compromises someone else's mappings too.