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authorMatt Fleming <matt.fleming@intel.com>2012-05-11 10:58:04 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2012-05-21 23:52:34 -0400
commitbcb8c8d0b7131df1b5aad011db33e17f8def5d0b (patch)
treeb1c8b02bb4b6afa271565e530be64358fa13db87 /arch/microblaze/kernel
parenta12c3694aeb0321d5e6a50321c63881bd92a1bf2 (diff)
downloadlinux-linaro-stable-bcb8c8d0b7131df1b5aad011db33e17f8def5d0b.tar.gz
microblaze: fix signal masking
There are a couple of problems with the current signal code, 1. If we failed to setup the signal stack frame then we should not be masking any signals. 2. ka->sa.sa_mask is only added to the current blocked signals list if SA_NODEFER is set in ka->sa.sa_flags. If we successfully setup the signal frame and are going to run the handler then we must honour sa_mask. Acked-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Michal Simek <monstr@monstr.eu> Signed-off-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/microblaze/kernel')
-rw-r--r--arch/microblaze/kernel/signal.c31
1 files changed, 18 insertions, 13 deletions
diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index 9e749c032af8..f2c13d5a6261 100644
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -169,7 +169,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
return (void __user *)((sp - frame_size) & -8UL);
}
-static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
@@ -267,10 +267,11 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
current->comm, current->pid, frame, regs->pc);
#endif
- return;
+ return 0;
give_sigsegv:
force_sigsegv(sig, current);
+ return -EFAULT;
}
/* Handle restarting system calls */
@@ -314,21 +315,25 @@ static int
handle_signal(unsigned long sig, struct k_sigaction *ka,
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
{
+ int ret;
+
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
- setup_rt_frame(sig, ka, info, oldset, regs);
+ ret = setup_rt_frame(sig, ka, info, oldset, regs);
else
- setup_rt_frame(sig, ka, NULL, oldset, regs);
+ ret = setup_rt_frame(sig, ka, NULL, oldset, regs);
+
+ if (ret)
+ return ret;
- if (!(ka->sa.sa_flags & SA_NODEFER)) {
- spin_lock_irq(&current->sighand->siglock);
- sigorsets(&current->blocked,
- &current->blocked, &ka->sa.sa_mask);
+ 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, sig);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
- }
- return 1;
+ recalc_sigpending();
+ spin_unlock_irq(&current->sighand->siglock);
+
+ return 0;
}
/*
@@ -369,7 +374,7 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall)
/* Whee! Actually deliver the signal. */
if (in_syscall)
handle_restart(regs, &ka, 1);
- if (handle_signal(signr, &ka, &info, oldset, regs)) {
+ if (!handle_signal(signr, &ka, &info, oldset, regs)) {
/*
* A signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,