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authorMatt Fleming <matt.fleming@intel.com>2012-03-23 23:01:50 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-24 00:58:31 +0100
commitd982d5955e9033015a2cc119aa7c0a878e275964 (patch)
tree19ce3a7db9d68886c73124831eb9937ad7a019b7
parentum: don't restore current->blocked on error (diff)
downloadlinux-d982d5955e9033015a2cc119aa7c0a878e275964.tar.xz
linux-d982d5955e9033015a2cc119aa7c0a878e275964.zip
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 <oleg@redhat.com> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/um/kernel/signal.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/arch/um/kernel/signal.c b/arch/um/kernel/signal.c
index 8382e0b91e8b..fb12f4c5e649 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(&current->sighand->siglock);
- sigorsets(&current->blocked, &current->blocked,
- &ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(&current->blocked, signr);
- recalc_sigpending();
- spin_unlock_irq(&current->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(&current->sighand->siglock);
- current->saved_sigmask = current->blocked;
- siginitset(&current->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
+ siginitset(&blocked, mask);
+ set_current_blocked(&blocked);
current->state = TASK_INTERRUPTIBLE;
schedule();