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From: Matt Fleming <matt@console-pimps.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: linux-kernel@vger.kernel.org, "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 28/41] sparc: Use set_current_blocked()
Date: Thu, 11 Aug 2011 14:57:02 +0100	[thread overview]
Message-ID: <1313071035-12047-29-git-send-email-matt@console-pimps.org> (raw)
In-Reply-To: <1313071035-12047-1-git-send-email-matt@console-pimps.org>

From: Matt Fleming <matt.fleming@intel.com>

As described in e6fa16ab ("signal: sigprocmask() should do
retarget_shared_pending()") the modification of current->blocked is
incorrect as we need to check whether the signal we're about to block
is pending in the shared queue.

Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
 arch/sparc/kernel/signal32.c  |   19 ++++++-------------
 arch/sparc/kernel/signal_32.c |   30 ++++++++++++------------------
 arch/sparc/kernel/signal_64.c |   30 ++++++++++++------------------
 3 files changed, 30 insertions(+), 49 deletions(-)

diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c
index 75fad42..4f381ce 100644
--- a/arch/sparc/kernel/signal32.c
+++ b/arch/sparc/kernel/signal32.c
@@ -287,10 +287,7 @@ void do_sigreturn32(struct pt_regs *regs)
 		case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
 	}
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 	return;
 
 segv:
@@ -383,10 +380,7 @@ asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
 		case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
 	}
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 	return;
 segv:
 	force_sig(SIGSEGV, current);
@@ -756,6 +750,7 @@ static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka,
 				  siginfo_t *info,
 				  sigset_t *oldset, struct pt_regs *regs)
 {
+	sigset_t blocked;
 	int err;
 
 	if (ka->sa.sa_flags & SA_SIGINFO)
@@ -766,12 +761,10 @@ static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka,
 	if (err)
 		return err;
 
-	spin_lock_irq(&current->sighand->siglock);
-	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
 	if (!(ka->sa.sa_flags & SA_NOMASK))
-		sigaddset(&current->blocked,signr);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+		sigaddset(&blocked, signr);
+	set_current_blocked(&blocked);
 
 	tracehook_signal_handler(signr, info, ka, regs, 0);
 
diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
index 5e5c5fd..d65c31d 100644
--- a/arch/sparc/kernel/signal_32.c
+++ b/arch/sparc/kernel/signal_32.c
@@ -60,12 +60,13 @@ struct rt_signal_frame {
 
 static int _sigpause_common(old_sigset_t set)
 {
-	set &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
+	sigset_t blocked;
+
 	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, set);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+
+	set &= _BLOCKABLE;
+	siginitset(&blocked, set);
+	set_current_blocked(&blocked);
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
@@ -165,10 +166,7 @@ asmlinkage void do_sigreturn(struct pt_regs *regs)
 		goto segv_and_exit;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 	return;
 
 segv_and_exit:
@@ -229,10 +227,7 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 	set_fs(old_fs);
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 	return;
 segv:
 	force_sig(SIGSEGV, current);
@@ -484,6 +479,7 @@ static inline int
 handle_signal(unsigned long signr, struct k_sigaction *ka,
 	      siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
 {
+	sigset_t blocked;
 	int err;
 
 	if (ka->sa.sa_flags & SA_SIGINFO)
@@ -494,12 +490,10 @@ handle_signal(unsigned long signr, struct k_sigaction *ka,
 	if (err)
 		return err;
 
-	spin_lock_irq(&current->sighand->siglock);
-	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
 	if (!(ka->sa.sa_flags & SA_NOMASK))
-		sigaddset(&current->blocked, signr);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+		sigaddset(&blocked, signr);
+	set_current_blocked(&blocked);
 
 	tracehook_signal_handler(signr, info, ka, regs, 0);
 
diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c
index 006fe45..bb153d1 100644
--- a/arch/sparc/kernel/signal_64.c
+++ b/arch/sparc/kernel/signal_64.c
@@ -69,10 +69,7 @@ asmlinkage void sparc64_set_context(struct pt_regs *regs)
 				goto do_sigsegv;
 		}
 		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 (test_thread_flag(TIF_32BIT)) {
 		pc &= 0xffffffff;
@@ -241,12 +238,13 @@ struct rt_signal_frame {
 
 static long _sigpause_common(old_sigset_t set)
 {
-	set &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
+	sigset_t blocked;
+
 	current->saved_sigmask = current->blocked;
-	siginitset(&current->blocked, set);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+
+	set &= _BLOCKABLE;
+	siginitset(&blocked, set);
+	set_current_blocked(&set);
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
@@ -341,10 +339,7 @@ void do_rt_sigreturn(struct pt_regs *regs)
 	pt_regs_clear_syscall(regs);
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 	return;
 segv:
 	force_sig(SIGSEGV, current);
@@ -498,18 +493,17 @@ static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
 				siginfo_t *info,
 				sigset_t *oldset, struct pt_regs *regs)
 {
+	sigset_t blocked;
 	int err;
 
 	err = setup_rt_frame(ka, regs, signr, oldset,
 			     (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
 	if (err)
 		return err;
-	spin_lock_irq(&current->sighand->siglock);
-	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
 	if (!(ka->sa.sa_flags & SA_NOMASK))
-		sigaddset(&current->blocked,signr);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+		sigaddset(&blocked, signr);
+	set_current_blocked(&blocked);
 
 	tracehook_signal_handler(signr, info, ka, regs, 0);
 
-- 
1.7.4.4


  parent reply	other threads:[~2011-08-11 14:01 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-11 13:56 [PATCH 00/41] signal: Use set_current_blocked() Matt Fleming
2011-08-11 13:56 ` [PATCH 01/41] alpha: " Matt Fleming
2011-08-11 13:56 ` [PATCH 02/41] arm: " Matt Fleming
2011-08-11 17:04   ` Will Deacon
2011-08-11 13:56 ` [PATCH 03/41] avr32: Don't mask signals in the error path Matt Fleming
2011-08-11 13:56 ` [PATCH 04/41] avr32: use set_current_blocked() in handle_signal/sys_rt_sigreturn Matt Fleming
2011-08-11 13:56 ` [PATCH 05/41] blackfin: Use set_current_blocked() Matt Fleming
2011-08-11 13:56 ` [PATCH 06/41] cris: " Matt Fleming
2011-08-11 13:56 ` [PATCH 07/41] frv: " Matt Fleming
2011-08-11 13:56 ` [PATCH 08/41] h8300: " Matt Fleming
2011-08-11 13:56 ` [PATCH 09/41] ia64: " Matt Fleming
2011-08-11 13:56 ` [PATCH 10/41] m32r: " Matt Fleming
2011-08-11 13:56 ` [PATCH 11/41] m68k: " Matt Fleming
2011-08-11 13:56 ` [PATCH 12/41] microblaze: Don't reimplement force_sigsegv() Matt Fleming
2011-08-16 17:20   ` Oleg Nesterov
2011-08-16 17:20     ` Oleg Nesterov
2011-08-17 13:01       ` Michal Simek
2011-08-17 13:14         ` Oleg Nesterov
2011-08-17 13:25           ` Matt Fleming
2011-08-17 13:17         ` Matt Fleming
2011-08-17 13:22           ` Michal Simek
2011-08-11 13:56 ` [PATCH 13/41] microblaze: No need to reset handler if SA_ONESHOT Matt Fleming
2011-08-11 13:56 ` [PATCH 14/41] microblaze: Fix signal masking Matt Fleming
2011-08-11 13:56 ` [PATCH 15/41] microblaze: Use set_current_blocked() Matt Fleming
2011-08-11 13:56 ` [PATCH 16/41] MIPS: " Matt Fleming
2011-08-11 13:56 ` [PATCH 17/41] mn10300: " Matt Fleming
2011-08-11 13:56 ` [PATCH 18/41] OpenRISC: Don't reimplement force_sigsegv() Matt Fleming
2011-08-16 16:49   ` Oleg Nesterov
2011-08-16 19:33     ` Matt Fleming
2011-08-18 17:47       ` Oleg Nesterov
2011-08-11 13:56 ` [PATCH 19/41] OpenRISC: No need to reset handler if SA_ONESHOT Matt Fleming
2011-08-16 16:53   ` Oleg Nesterov
2011-08-11 13:56 ` [PATCH 20/41] OpenRISC: Don't mask signals if we fail to setup signal stack Matt Fleming
2011-08-11 13:56 ` [PATCH 21/41] OpenRISC: Use set_current_blocked() Matt Fleming
2011-08-11 13:56 ` [PATCH 22/41] parisc: " Matt Fleming
2011-08-11 13:56 ` [PATCH 23/41] powerpc: " Matt Fleming
2011-08-11 13:56 ` [PATCH 24/41] score: Don't mask signals if we fail to setup signal stack Matt Fleming
2011-08-11 13:56 ` [PATCH 25/41] score: Use set_current_blocked() Matt Fleming
2011-08-11 13:57 ` [PATCH 26/41] sh: No need to reset handler if SA_ONESHOT Matt Fleming
2011-08-16 17:25   ` Oleg Nesterov
2011-08-11 13:57 ` [PATCH 27/41] sh: Use set_current_blocked() Matt Fleming
2011-08-11 13:57 ` Matt Fleming [this message]
2011-08-11 13:57 ` [PATCH 29/41] tile: " Matt Fleming
2011-08-11 17:10   ` Chris Metcalf
2011-08-11 13:57 ` [PATCH 30/41] um: " Matt Fleming
2011-08-11 13:57 ` [PATCH 31/41] um: Don't restore current->blocked on error Matt Fleming
2011-08-16 17:38   ` Oleg Nesterov
2011-08-11 13:57 ` [PATCH 32/41] unicore32: Use set_current_blocked() Matt Fleming
2011-08-18  8:34   ` Guan Xuetao
2011-08-11 13:57 ` [PATCH 33/41] xtensa: Don't reimplement force_sigsegv() Matt Fleming
2011-08-16 17:40   ` Oleg Nesterov
2011-08-11 13:57 ` [PATCH 34/41] xtensa: No need to reset handler if SA_ONESHOT Matt Fleming
2011-08-11 13:57 ` [PATCH 35/41] xtensa: Don't mask signals if we fail to setup signal stack Matt Fleming
2011-08-11 13:57 ` [PATCH 36/41] xtensa: Use set_current_blocked() Matt Fleming
2011-08-11 13:57 ` [PATCH 37/41] autofs4: " Matt Fleming
2011-08-16 17:47   ` Oleg Nesterov
2011-08-16 20:29     ` Matt Fleming
2011-08-11 13:57 ` [PATCH 38/41] coda: " Matt Fleming
2011-08-11 13:57 ` [PATCH 39/41] dlm: Remove another superfluous call to recalc_sigpending() Matt Fleming
2011-08-11 15:39   ` David Teigland
2011-08-16 19:36   ` Oleg Nesterov
2011-08-11 13:57 ` [PATCH 40/41] ncpfs: Use set_current_blocked() Matt Fleming
2011-08-16 17:56   ` Oleg Nesterov
2011-08-16 20:56     ` Matt Fleming
2011-08-17 12:04       ` Oleg Nesterov
2011-08-17 13:58         ` Matt Fleming
2011-08-17 14:41           ` Oleg Nesterov
     [not found]             ` <CA+i2_De=mKMHj++b5=ZPdXxp7pm2KzY+PzCaG++GWSud20a_qQ@mail.gmail.com>
2011-08-18 17:05               ` Oleg Nesterov
2011-08-18 20:09                 ` Matt Fleming
2011-08-11 13:57 ` [PATCH 41/41] exit: Use __set_task_blocked() Matt Fleming
2011-08-16 18:06   ` Oleg Nesterov
2011-08-16 19:44     ` [PATCH 0/1] kthreads: allow_signal: don't play with ->blocked Oleg Nesterov
2011-08-16 19:44       ` [PATCH 1/1] " Oleg Nesterov
2011-08-16 19:51         ` Tejun Heo
2011-08-16 20:07           ` Oleg Nesterov
2011-08-16 21:50           ` Matt Fleming
2011-08-17  7:27             ` Tejun Heo
2011-08-17  9:56               ` Matt Fleming
2011-08-17 18:26               ` Oleg Nesterov
2011-08-16 21:51     ` [PATCH 41/41] exit: Use __set_task_blocked() Matt Fleming
2011-08-11 16:03 ` [PATCH 00/41] signal: Use set_current_blocked() Oleg Nesterov
2011-08-16 19:40   ` Matt Fleming
2011-08-17 17:01     ` Oleg Nesterov
2011-08-17 22:17       ` Matt Fleming
2011-08-18 11:09         ` Matt Fleming
2011-08-18 18:36           ` Oleg Nesterov
2011-08-16 19:58 ` Oleg Nesterov

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