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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 CDDE8C43464 for ; Fri, 18 Sep 2020 02:16:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8AFC0238EE for ; Fri, 18 Sep 2020 02:16:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395379; bh=JuUO/LAQki3vuHxqPqUSPGw+B0wpIrEOZt7xATwMrwU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vAdlGAOZIS9HSWTAE/yTjw5S9gXtBP9Rwfy/vp2od3z58J5Ll5zmkaqWLKgM5/a0b exvSrP9nY+TFoTJBV0YZF7io03rC1evq61op9ijDD3KIfAmQr9g+yBhOg7oUBsVVxi AxHrgtTlmEn+BZatemYF3xtXPG+opHx7VhTUatBA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729384AbgIRCQR (ORCPT ); Thu, 17 Sep 2020 22:16:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:45610 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729369AbgIRCQL (ORCPT ); Thu, 17 Sep 2020 22:16:11 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B384A23787; Fri, 18 Sep 2020 02:16:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395370; bh=JuUO/LAQki3vuHxqPqUSPGw+B0wpIrEOZt7xATwMrwU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cW6vxxHnbnQwyAl1s2UhstJ07HldSbN3VlrSU4TOGdpMB8IBhtbbk9NyGZfEL/Z7v nsMJrdfJWK13gSzUftvn9pn8sXlhy8LcyoBzdhazjGCZ0f7c4tuI7htV7/iVCPKdcn e0oBZoXC7u3rT5UvV92BLXT2xb5ePuNUnlQOkndk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jaewon Kim , Andrew Morton , Matthew Wilcox , Michel Lespinasse , Borislav Petkov , Linus Torvalds , Sasha Levin , linux-mm@kvack.org Subject: [PATCH AUTOSEL 4.9 63/90] mm/mmap.c: initialize align_offset explicitly for vm_unmapped_area Date: Thu, 17 Sep 2020 22:14:28 -0400 Message-Id: <20200918021455.2067301-63-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918021455.2067301-1-sashal@kernel.org> References: <20200918021455.2067301-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 7109f886e739e..7c8815636c482 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2028,6 +2028,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, info.low_limit = mm->mmap_base; info.high_limit = TASK_SIZE; info.align_mask = 0; + info.align_offset = 0; return vm_unmapped_area(&info); } #endif @@ -2069,6 +2070,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.low_limit = max(PAGE_SIZE, mmap_min_addr); info.high_limit = mm->mmap_base; info.align_mask = 0; + info.align_offset = 0; addr = vm_unmapped_area(&info); /* -- 2.25.1