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=-9.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 09E39C43441 for ; Mon, 12 Nov 2018 00:19:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C629E2084C for ; Mon, 12 Nov 2018 00:19:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="k4E8kkqx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C629E2084C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730189AbeKLKKP (ORCPT ); Mon, 12 Nov 2018 05:10:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:58420 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729768AbeKLIQy (ORCPT ); Mon, 12 Nov 2018 03:16:54 -0500 Received: from localhost (unknown [206.108.79.134]) (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 CCE9C2175B; Sun, 11 Nov 2018 22:26:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541975218; bh=Rx3BK9wNQ7WRAINZj8JQsEa0Nf7iAX5LUk5+nLvsV2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k4E8kkqxzMhiyVwSU4uXp/4Ifen24sbTPQ1ZhP3eXuUm99c0ADcSP9ih+YD8N2w47 fx3bz3kPWnPHRRug3FMGOtZUEd+1tIgqsyKweaG6Q+4Z3elHVnfaaKcwu/nDK9c83G 8qRoheWiB6IsqcIxB4xoVApxqMy3XXYmmT/PpZFQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Huacai Chen , Paul Burton , Ralf Baechle , James Hogan , linux-mips@linux-mips.org, Fuxin Zhang , Zhangjin Wu , Huacai Chen , Sasha Levin Subject: [PATCH 4.19 002/361] MIPS: VDSO: Reduce VDSO_RANDOMIZE_SIZE to 64MB for 64bit Date: Sun, 11 Nov 2018 14:15:49 -0800 Message-Id: <20181111221620.507857847@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181111221619.915519183@linuxfoundation.org> References: <20181111221619.915519183@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit c61c7def1fa0a722610d89790e0255b74f3c07dd ] Commit ea7e0480a4b6 ("MIPS: VDSO: Always map near top of user memory") set VDSO_RANDOMIZE_SIZE to 256MB for 64bit kernel. But take a look at arch/mips/mm/mmap.c we can see that MIN_GAP is 128MB, which means the mmap_base may be at (user_address_top - 128MB). This make the stack be surrounded by mmaped areas, then stack expanding fails and causes a segmentation fault. Therefore, VDSO_RANDOMIZE_SIZE should be less than MIN_GAP and this patch reduce it to 64MB. Signed-off-by: Huacai Chen Signed-off-by: Paul Burton Fixes: ea7e0480a4b6 ("MIPS: VDSO: Always map near top of user memory") Patchwork: https://patchwork.linux-mips.org/patch/20910/ Cc: Ralf Baechle Cc: James Hogan Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang Cc: Zhangjin Wu Cc: Huacai Chen Cc: stable@vger.kernel.org # 4.19 Signed-off-by: Sasha Levin --- arch/mips/include/asm/processor.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h index 49d6046ca1d0..c373eb605040 100644 --- a/arch/mips/include/asm/processor.h +++ b/arch/mips/include/asm/processor.h @@ -81,7 +81,7 @@ extern unsigned int vced_count, vcei_count; #endif -#define VDSO_RANDOMIZE_SIZE (TASK_IS_32BIT_ADDR ? SZ_1M : SZ_256M) +#define VDSO_RANDOMIZE_SIZE (TASK_IS_32BIT_ADDR ? SZ_1M : SZ_64M) extern unsigned long mips_stack_top(void); #define STACK_TOP mips_stack_top() -- 2.17.1