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 3D8E0C433DF for ; Thu, 2 Jul 2020 01:30:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 083AE2085B for ; Thu, 2 Jul 2020 01:30:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593653458; bh=6t0304VVq8qHRtF3VlLkSQavf4nL9jYUuZhfGtHtCTs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1i3mEVOiBhQOyGinT/0n1I49PaPIsd/gwSOvwlXPPrLCTHA8razHcpzpd8KrwhdV8 K/j5Yw0Q7RRQaxjDPAjDud8F6Enyl+HgIvq2vYJD0vJT299r6J9eKSPmHvmPHqfKiM h82NnzgCmM38udwQGJbYylaZBzo6eayOSWTeA8JM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729041AbgGBBaz (ORCPT ); Wed, 1 Jul 2020 21:30:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:58400 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729286AbgGBB0s (ORCPT ); Wed, 1 Jul 2020 21:26:48 -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 ECAC320748; Thu, 2 Jul 2020 01:26:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593653207; bh=6t0304VVq8qHRtF3VlLkSQavf4nL9jYUuZhfGtHtCTs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IQJXIB22tVDmNt3JankG873a+wVGMOC+2tA/IsTQYo6QxK35Sy5mu5hlAq8T28yYj q/NqbNu4PMBWoSu1YeTdNjhMSIcgjA1PItQVDWYwebAPaRpwZ1kdi4DujCx3wfgukn DtGU3cQlkJZ93o9AxnjNWCvcAqPkuPmyrgpYWiSg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Peter Zijlstra , Andy Lutomirski , Marco Elver , Lai Jiangshan , Sasha Levin Subject: [PATCH AUTOSEL 4.19 26/27] x86/entry: Increase entry_stack size to a full page Date: Wed, 1 Jul 2020 21:26:14 -0400 Message-Id: <20200702012615.2701532-26-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200702012615.2701532-1-sashal@kernel.org> References: <20200702012615.2701532-1-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: Peter Zijlstra [ Upstream commit c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 ] Marco crashed in bad_iret with a Clang11/KCSAN build due to overflowing the stack. Now that we run C code on it, expand it to a full page. Suggested-by: Andy Lutomirski Reported-by: Marco Elver Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Lai Jiangshan Tested-by: Marco Elver Link: https://lkml.kernel.org/r/20200618144801.819246178@infradead.org Signed-off-by: Sasha Levin --- arch/x86/include/asm/processor.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index efb44bd3a7140..0f750e7b24071 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -336,7 +336,7 @@ struct x86_hw_tss { #define INVALID_IO_BITMAP_OFFSET 0x8000 struct entry_stack { - unsigned long words[64]; + char stack[PAGE_SIZE]; }; struct entry_stack_page { -- 2.25.1