From patchwork Tue Jul 30 05:51:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 11065041 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B86EC746 for ; Tue, 30 Jul 2019 06:02:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A781028704 for ; Tue, 30 Jul 2019 06:02:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9BCF628716; Tue, 30 Jul 2019 06:02:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 470A928704 for ; Tue, 30 Jul 2019 06:02:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=04lBLcfG0o+AF6wWVBBzabTlxCdpMethYTqhxQ+5I4Y=; b=kIHsfIN+DsOT29 JbDeG7blwaNRU8w900eQ/bgOD/CRS+1k5dq5NitiSFpgegOXtgrzqCYAKA39YsYuu9jje/nuIpQ4A Ni4eJtrjvYo22/bT89J6R7HHkIVAsv7t505PTV/uDJU5Y9gGfmpgrpQtgNbsVPf6eJpoxTNzezO9X XWmlri/sL4+ANxd7axiIo3KFZbB2H5QcQAZ+Xr6K6IZFgxaaFRDjE+YMEupdnFdS03P7sVsxbFY1T mf0OLgSv0MKf02yLN0CPwcC0qOgATHtBWdxVQ9aQ/FDplkqar+8Zt5IF3CjgjeWzzJxrxf17JFeGp QbsOD0aM9SAQ+u6uaqHA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hsLDb-0008Hg-IH; Tue, 30 Jul 2019 06:02:39 +0000 Received: from relay8-d.mail.gandi.net ([217.70.183.201]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hsLDL-00085v-M6; Tue, 30 Jul 2019 06:02:25 +0000 X-Originating-IP: 79.86.19.127 Received: from alex.numericable.fr (127.19.86.79.rev.sfr.net [79.86.19.127]) (Authenticated sender: alex@ghiti.fr) by relay8-d.mail.gandi.net (Postfix) with ESMTPSA id 925B41BF20E; Tue, 30 Jul 2019 06:02:17 +0000 (UTC) From: Alexandre Ghiti To: Andrew Morton Subject: [PATCH v5 10/14] mips: Use STACK_TOP when computing mmap base address Date: Tue, 30 Jul 2019 01:51:09 -0400 Message-Id: <20190730055113.23635-11-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190730055113.23635-1-alex@ghiti.fr> References: <20190730055113.23635-1-alex@ghiti.fr> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190729_230223_874814_A92037DF X-CRM114-Status: UNSURE ( 9.83 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Albert Ou , Kees Cook , Alexandre Ghiti , Catalin Marinas , Palmer Dabbelt , Will Deacon , Russell King , Ralf Baechle , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Luis Chamberlain , Paul Burton , James Hogan , linux-fsdevel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-mips@vger.kernel.org, Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Alexander Viro Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP mmap base address must be computed wrt stack top address, using TASK_SIZE is wrong since STACK_TOP and TASK_SIZE are not equivalent. Signed-off-by: Alexandre Ghiti Acked-by: Kees Cook Acked-by: Paul Burton Reviewed-by: Luis Chamberlain --- arch/mips/mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c index f5c778113384..a7e84b2e71d7 100644 --- a/arch/mips/mm/mmap.c +++ b/arch/mips/mm/mmap.c @@ -22,7 +22,7 @@ EXPORT_SYMBOL(shm_align_mask); /* 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) @@ -54,7 +54,7 @@ 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); } #define COLOUR_ALIGN(addr, pgoff) \