From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 E9871C4727C for ; Tue, 29 Sep 2020 12:02:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CD5B206F7 for ; Tue, 29 Sep 2020 12:02:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601380937; bh=j47Y/OmtPQBlLz+805C+9tGJZUihfnFkicJQ1q/pSBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IhNuZwLeRD67knRZpUE2NfLbNLocoQiusXA2efoDgtEhuHG7xnfMs3mZ4jGxpDujJ XnNzdC0FJDOyOIGOjRhxoc9R8Dw9lpnMz33hp0C5N78+IBSGVGt9wQtI1FWln3GgPX MXkIsaJb2TsyGU8wzLFBpW7NKr9YsaJ+IMW9Du4g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731757AbgI2MCQ (ORCPT ); Tue, 29 Sep 2020 08:02:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:34556 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730489AbgI2Ljj (ORCPT ); Tue, 29 Sep 2020 07:39:39 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B56F5206E5; Tue, 29 Sep 2020 11:39:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601379579; bh=j47Y/OmtPQBlLz+805C+9tGJZUihfnFkicJQ1q/pSBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kw3C1XaWYuOQhzDEeZH+14SErpgO09h6WPX7eJy7ISiLY0gsiuL/7T+wd356Qzvok JWW4RKr74974QnMesiQTwNfL5mYLneHj0s4p1C1Hh3U/1e2U3aeZQ/BdbH50wohE5N 9+BINzmv6qVVzXel8xvO+m4TzqniJjw3tpuMxctQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jaewon Kim , Andrew Morton , "Matthew Wilcox (Oracle)" , Michel Lespinasse , Borislav Petkov , Linus Torvalds , Sasha Levin Subject: [PATCH 5.4 227/388] mm/mmap.c: initialize align_offset explicitly for vm_unmapped_area Date: Tue, 29 Sep 2020 12:59:18 +0200 Message-Id: <20200929110021.466184620@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200929110010.467764689@linuxfoundation.org> References: <20200929110010.467764689@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jaewon Kim [ Upstream commit 09ef5283fd96ac424ef0e569626f359bf9ab86c9 ] On passing requirement to vm_unmapped_area, arch_get_unmapped_area and arch_get_unmapped_area_topdown did not set align_offset. Internally on both unmapped_area and unmapped_area_topdown, if info->align_mask is 0, then info->align_offset was meaningless. But commit df529cabb7a2 ("mm: mmap: add trace point of vm_unmapped_area") always prints info->align_offset even though it is uninitialized. Fix this uninitialized value issue by setting it to 0 explicitly. Before: vm_unmapped_area: addr=0x755b155000 err=0 total_vm=0x15aaf0 flags=0x1 len=0x109000 lo=0x8000 hi=0x75eed48000 mask=0x0 ofs=0x4022 After: vm_unmapped_area: addr=0x74a4ca1000 err=0 total_vm=0x168ab1 flags=0x1 len=0x9000 lo=0x8000 hi=0x753d94b000 mask=0x0 ofs=0x0 Signed-off-by: Jaewon Kim Signed-off-by: Andrew Morton Reviewed-by: Andrew Morton Cc: Matthew Wilcox (Oracle) Cc: Michel Lespinasse Cc: Borislav Petkov Link: http://lkml.kernel.org/r/20200409094035.19457-1-jaewon31.kim@samsung.com Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/mmap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/mmap.c b/mm/mmap.c index a3584a90c55c2..ba78f1f1b1bd1 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2126,6 +2126,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, info.low_limit = mm->mmap_base; info.high_limit = mmap_end; info.align_mask = 0; + info.align_offset = 0; return vm_unmapped_area(&info); } #endif @@ -2167,6 +2168,7 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, info.low_limit = max(PAGE_SIZE, mmap_min_addr); info.high_limit = arch_get_mmap_base(addr, mm->mmap_base); info.align_mask = 0; + info.align_offset = 0; addr = vm_unmapped_area(&info); /* -- 2.25.1