From f6adb9a6aec0ec9540e15f354e5cdec88b2aea33 Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Fri, 23 Mar 2012 15:01:49 -0700 Subject: um: don't restore current->blocked on error If we fail to setup the signal stack frame then we don't need to restore current->blocked because it is not modified by setup_signal_stack_*. Acked-by: Oleg Nesterov Acked-by: Richard Weinberger Tested-by: Richard Weinberger Signed-off-by: Matt Fleming Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/signal.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'arch/um/kernel/signal.c') diff --git a/arch/um/kernel/signal.c b/arch/um/kernel/signal.c index e8b889d3bce..8382e0b91e8 100644 --- a/arch/um/kernel/signal.c +++ b/arch/um/kernel/signal.c @@ -65,13 +65,9 @@ static int handle_signal(struct pt_regs *regs, unsigned long signr, #endif err = setup_signal_stack_si(sp, signr, ka, regs, info, oldset); - if (err) { - spin_lock_irq(¤t->sighand->siglock); - current->blocked = *oldset; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); + if (err) force_sigsegv(signr, current); - } else { + else { spin_lock_irq(¤t->sighand->siglock); sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); -- cgit v1.2.3-70-g09d2 From d982d5955e9033015a2cc119aa7c0a878e275964 Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Fri, 23 Mar 2012 15:01:50 -0700 Subject: um: use set_current_blocked() and block_sigmask() As described in commit e6fa16ab9c1e ("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. Also, use the new helper function introduced in commit 5e6292c0f28f ("signal: add block_sigmask() for adding sigmask to current->blocked") which centralises the code for updating current->blocked after successfully delivering a signal and reduces the amount of duplicate code across architectures. In the past some architectures got this code wrong, so using this helper function should stop that from happening again. Acked-by: Oleg Nesterov Cc: Richard Weinberger Signed-off-by: Matt Fleming Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/signal.c | 20 ++++++-------------- 1 file changed, 6 insertions(+), 14 deletions(-) (limited to 'arch/um/kernel/signal.c') diff --git a/arch/um/kernel/signal.c b/arch/um/kernel/signal.c index 8382e0b91e8..fb12f4c5e64 100644 --- a/arch/um/kernel/signal.c +++ b/arch/um/kernel/signal.c @@ -67,15 +67,8 @@ static int handle_signal(struct pt_regs *regs, unsigned long signr, if (err) force_sigsegv(signr, current); - else { - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked, ¤t->blocked, - &ka->sa.sa_mask); - if (!(ka->sa.sa_flags & SA_NODEFER)) - sigaddset(¤t->blocked, signr); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } + else + block_sigmask(ka, signr); return err; } @@ -158,12 +151,11 @@ int do_signal(void) */ long sys_sigsuspend(int history0, int history1, old_sigset_t mask) { + sigset_t blocked; + mask &= _BLOCKABLE; - spin_lock_irq(¤t->sighand->siglock); - current->saved_sigmask = current->blocked; - siginitset(¤t->blocked, mask); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); + siginitset(&blocked, mask); + set_current_blocked(&blocked); current->state = TASK_INTERRUPTIBLE; schedule(); -- cgit v1.2.3-70-g09d2