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=-10.1 required=3.0 tests=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 BB021C4360C for ; Sun, 29 Sep 2019 17:35:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9525E2196E for ; Sun, 29 Sep 2019 17:35:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569778538; bh=Rq5KCnNb5DcsX1r+Iur5At0kw9Uc65vXdmpWwLR0yhI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eRU2It5HZdeNu/cOd8y51EbRN2h/M4dZ6TB6NgKjVvqut3WqkZ/joBWF0sOKcNlvO to010auvj6I223aawnYdFIecJ7PkbqbZ4hXLqqxv1Kq9cXbtoZPkbp2c+Yo8dnGgF5 Ewzid2UIAp+yKb8WajYl+v4W/iFwuSIOTgl/ROk0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730614AbfI2Rfi (ORCPT ); Sun, 29 Sep 2019 13:35:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:47704 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730605AbfI2Rfd (ORCPT ); Sun, 29 Sep 2019 13:35:33 -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 DDE3F21928; Sun, 29 Sep 2019 17:35:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569778532; bh=Rq5KCnNb5DcsX1r+Iur5At0kw9Uc65vXdmpWwLR0yhI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DGTXIzriZBYQ7lCcUwsiB5/dU0nVa3xwuPc+g2mpF/y6Up4MksFBmFMrECG68C4o9 Ii8DLuAFdmWNRK97QRUV1Db41H+3jyvwVKzdvEXGomjq309DZQkVhzyK1Hd1cdA2Pj JLSpYGliprzbGHUct+LC1vLh8plAh6Tyt11pZ/xQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alexandre Ghiti , Kees Cook , Luis Chamberlain , Albert Ou , Alexander Viro , Catalin Marinas , Christoph Hellwig , Christoph Hellwig , James Hogan , Palmer Dabbelt , Paul Burton , Ralf Baechle , Russell King , Will Deacon , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL 4.19 33/33] arm: use STACK_TOP when computing mmap base address Date: Sun, 29 Sep 2019 13:34:21 -0400 Message-Id: <20190929173424.9361-33-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190929173424.9361-1-sashal@kernel.org> References: <20190929173424.9361-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexandre Ghiti [ Upstream commit 86e568e9c0525fc40e76d827212d5e9721cf7504 ] mmap base address must be computed wrt stack top address, using TASK_SIZE is wrong since STACK_TOP and TASK_SIZE are not equivalent. Link: http://lkml.kernel.org/r/20190730055113.23635-8-alex@ghiti.fr Signed-off-by: Alexandre Ghiti Acked-by: Kees Cook Reviewed-by: Luis Chamberlain Cc: Albert Ou Cc: Alexander Viro Cc: Catalin Marinas Cc: Christoph Hellwig Cc: Christoph Hellwig Cc: James Hogan Cc: Palmer Dabbelt Cc: Paul Burton Cc: Ralf Baechle Cc: Russell King Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- arch/arm/mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index bff3d00bda5be..0b94b674aa91f 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -19,7 +19,7 @@ /* gap between mmap and stack */ #define MIN_GAP (128*1024*1024UL) -#define MAX_GAP ((TASK_SIZE)/6*5) +#define MAX_GAP ((STACK_TOP)/6*5) #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) static int mmap_is_legacy(struct rlimit *rlim_stack) @@ -51,7 +51,7 @@ static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack) else if (gap > MAX_GAP) gap = MAX_GAP; - return PAGE_ALIGN(TASK_SIZE - gap - rnd); + return PAGE_ALIGN(STACK_TOP - gap - rnd); } /* -- 2.20.1