From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754487AbeCVBpc (ORCPT ); Wed, 21 Mar 2018 21:45:32 -0400 Received: from akagi.fsij.org ([217.70.189.144]:38148 "EHLO akagi.fsij.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754466AbeCVBpa (ORCPT ); Wed, 21 Mar 2018 21:45:30 -0400 From: NIIBE Yutaka To: linux-kernel@vger.kernel.org Cc: NIIBE Yutaka Subject: [PATCH v2 2/4] signal/x86: do_signal: syscall restart should be done only once. Date: Thu, 22 Mar 2018 10:44:11 +0900 Message-Id: <20180322014413.24099-3-gniibe@fsij.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180322014413.24099-1-gniibe@fsij.org> References: <20180322014413.24099-1-gniibe@fsij.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org do_signal may be called multiple times from exit_to_usermode_loop. In those multiple calls, only the one should handle restarting the system call. When actually delivering a signal, make sure the register will not be examined again as syscall errno by another call of do_signal. Signed-off-by: NIIBE Yutaka --- arch/x86/kernel/signal.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index cdfb82031243..e709b54a01b8 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -729,6 +729,7 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs) regs->ip -= 2; break; } + regs->orig_ax = -1; } /* -- 2.11.0