From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933511Ab1DNRt6 (ORCPT ); Thu, 14 Apr 2011 13:49:58 -0400 Received: from mail.windriver.com ([147.11.1.11]:38610 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933473Ab1DNRr1 (ORCPT ); Thu, 14 Apr 2011 13:47:27 -0400 From: Paul Gortmaker To: stable@kernel.org, linux-kernel@vger.kernel.org Cc: stable-review@kernel.org, "David S. Miller" , Paul Gortmaker Subject: [34-longterm 110/209] sparc: Prevent no-handler signal syscall restart recursion. Date: Thu, 14 Apr 2011 13:42:20 -0400 Message-Id: <1302803039-9400-111-git-send-email-paul.gortmaker@windriver.com> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1302803039-9400-1-git-send-email-paul.gortmaker@windriver.com> References: <1302803039-9400-1-git-send-email-paul.gortmaker@windriver.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: David S. Miller ===================================================================== | This is a commit scheduled for the next v2.6.34 longterm release. | | If you see a problem with using this for longterm, please comment.| ===================================================================== commit c27852597829128a9c9d96d79ec454a83c6b0da5 upstream. Explicitly clear the "in-syscall" bit when we have no signal handler and back up the program counters to back up the system call. Reported-by: Al Viro Signed-off-by: David S. Miller Signed-off-by: Paul Gortmaker --- arch/sparc/kernel/signal32.c | 4 +++- arch/sparc/kernel/signal_32.c | 2 ++ arch/sparc/kernel/signal_64.c | 2 ++ 3 files changed, 7 insertions(+), 1 deletions(-) diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c index 643a354..75fad42 100644 --- a/arch/sparc/kernel/signal32.c +++ b/arch/sparc/kernel/signal32.c @@ -616,7 +616,7 @@ static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs, flush_signal_insns(address); } - return; + return 0; sigill: do_exit(SIGILL); @@ -840,12 +840,14 @@ void do_signal32(sigset_t *oldset, struct pt_regs * regs, regs->u_regs[UREG_I0] = orig_i0; regs->tpc -= 4; regs->tnpc -= 4; + pt_regs_clear_syscall(regs); } if (restart_syscall && regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { regs->u_regs[UREG_G1] = __NR_restart_syscall; regs->tpc -= 4; regs->tnpc -= 4; + pt_regs_clear_syscall(regs); } /* If there's no signal to deliver, we just put the saved sigmask diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c index 99c85e9..5e5c5fd 100644 --- a/arch/sparc/kernel/signal_32.c +++ b/arch/sparc/kernel/signal_32.c @@ -580,12 +580,14 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0) regs->u_regs[UREG_I0] = orig_i0; regs->pc -= 4; regs->npc -= 4; + pt_regs_clear_syscall(regs); } if (restart_syscall && regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { regs->u_regs[UREG_G1] = __NR_restart_syscall; regs->pc -= 4; regs->npc -= 4; + pt_regs_clear_syscall(regs); } /* if there's no signal to deliver, we just put the saved sigmask diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c index 3f19e67..006fe45 100644 --- a/arch/sparc/kernel/signal_64.c +++ b/arch/sparc/kernel/signal_64.c @@ -600,12 +600,14 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0) regs->u_regs[UREG_I0] = orig_i0; regs->tpc -= 4; regs->tnpc -= 4; + pt_regs_clear_syscall(regs); } if (restart_syscall && regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { regs->u_regs[UREG_G1] = __NR_restart_syscall; regs->tpc -= 4; regs->tnpc -= 4; + pt_regs_clear_syscall(regs); } /* If there's no signal to deliver, we just put the saved sigmask -- 1.7.4.4