From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752184AbbJaFmz (ORCPT ); Sat, 31 Oct 2015 01:42:55 -0400 Received: from mail.kernel.org ([198.145.29.136]:52743 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750919AbbJaFmx (ORCPT ); Sat, 31 Oct 2015 01:42:53 -0400 From: Andy Lutomirski To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Brian Gerst , Linus Torvalds , Borislav Petkov , Stas Sergeev , Andy Lutomirski Subject: [PATCH urgent 1/2] selftests/x86: Add a fork() to entry_from_vm86 to catch fork bugs Date: Fri, 30 Oct 2015 22:42:45 -0700 Message-Id: <08f83295460a80e41dc5e3e81ec40d6844d316f5.1446270067.git.luto@kernel.org> X-Mailer: git-send-email 2.4.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mere possession of vm86 state is strange. Make sure that nothing gets corrupted if we fork after calling vm86(). Signed-off-by: Andy Lutomirski --- tools/testing/selftests/x86/entry_from_vm86.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/testing/selftests/x86/entry_from_vm86.c b/tools/testing/selftests/x86/entry_from_vm86.c index 9a43a59a9bb4..13b2965472e3 100644 --- a/tools/testing/selftests/x86/entry_from_vm86.c +++ b/tools/testing/selftests/x86/entry_from_vm86.c @@ -229,5 +229,9 @@ int main(void) } clearhandler(SIGSEGV); + /* Make sure nothing explodes if we fork. */ + if (fork() > 0) + return 0; + return (nerrs == 0 ? 0 : 1); } -- 2.4.3