[PATCH] signals: convert the X86_32 code to use set_current_blocked()

[PATCH] signals: convert the X86_32 code to use set_current_blocked()

[Oleg Nesterov]

sys_sigsuspend() and sys_sigreturn() change ->blocked directly.
This is not correct, see the changelog in e6fa16ab
"signal: sigprocmask() should do retarget_shared_pending()"

Change them to use set_current_blocked().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---

 arch/x86/kernel/signal.c |   18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

--- ptrace/arch/x86/kernel/signal.c~3_x86_set_current_blocked	2011-07-10 19:45:21.000000000 +0200
+++ ptrace/arch/x86/kernel/signal.c	2011-07-10 21:00:04.000000000 +0200
@@ -485,17 +485,18 @@ static int __setup_rt_frame(int sig, str
 asmlinkage int
 sys_sigsuspend(int history0, int history1, old_sigset_t mask)
 {
-	mask &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
+	sigset_t blocked;
+
 	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, mask);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+
+	mask &= _BLOCKABLE;
+	siginitset(&blocked, mask);
+	set_current_blocked(&blocked);
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
-	set_restore_sigmask();
 
+	set_restore_sigmask();
 	return -ERESTARTNOHAND;
 }
 
@@ -572,10 +573,7 @@ unsigned long sys_sigreturn(struct pt_re
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 
 	if (restore_sigcontext(regs, &frame->sc, &ax))
 		goto badframe;

Re: [PATCH] signals: convert the X86_32 code to use set_current_blocked()

[Matt Fleming]

On Sun, 10 Jul 2011 21:27:27 +0200
Oleg Nesterov <oleg@redhat.com> wrote:

> sys_sigsuspend() and sys_sigreturn() change ->blocked directly.
> This is not correct, see the changelog in e6fa16ab
> "signal: sigprocmask() should do retarget_shared_pending()"
> 
> Change them to use set_current_blocked().
> 
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>

Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com>

Re: [PATCH] signals: convert the X86_32 code to use set_current_blocked()

[Tejun Heo]

On Sun, Jul 10, 2011 at 09:27:27PM +0200, Oleg Nesterov wrote:
> sys_sigsuspend() and sys_sigreturn() change ->blocked directly.
> This is not correct, see the changelog in e6fa16ab
> "signal: sigprocmask() should do retarget_shared_pending()"
> 
> Change them to use set_current_blocked().
> 
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>

Acked-by: Tejun Heo <tj@kernel.org>

-- 
tejun

[tip:x86/signal] x86, signals: Convert the X86_32 code to use set_current_blocked()

[tip-bot for Oleg Nesterov]

Commit-ID:  3982294b0342474ff91472b34c6afb701785f524
Gitweb:     http://git.kernel.org/tip/3982294b0342474ff91472b34c6afb701785f524
Author:     Oleg Nesterov <oleg@redhat.com>
AuthorDate: Sun, 10 Jul 2011 21:27:27 +0200
Committer:  H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Thu, 14 Jul 2011 21:21:57 -0700

x86, signals: Convert the X86_32 code to use set_current_blocked()

sys_sigsuspend() and sys_sigreturn() change ->blocked directly.
This is not correct, see the changelog in e6fa16ab
"signal: sigprocmask() should do retarget_shared_pending()"

Change them to use set_current_blocked().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: http://lkml.kernel.org/r/20110710192727.GA31759@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 arch/x86/kernel/signal.c |   18 ++++++++----------
 1 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 40a2493..bf9345d 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -485,17 +485,18 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 asmlinkage int
 sys_sigsuspend(int history0, int history1, old_sigset_t mask)
 {
-	mask &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
+	sigset_t blocked;
+
 	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, mask);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+
+	mask &= _BLOCKABLE;
+	siginitset(&blocked, mask);
+	set_current_blocked(&blocked);
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
-	set_restore_sigmask();
 
+	set_restore_sigmask();
 	return -ERESTARTNOHAND;
 }
 
@@ -572,10 +573,7 @@ unsigned long sys_sigreturn(struct pt_regs *regs)
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 
 	if (restore_sigcontext(regs, &frame->sc, &ax))
 		goto badframe;