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OpenRISC: Don't mask signals if we fail to setup signal stack

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setup_rt_frame() needs to return an indication of whether it succeeded
or failed in setting up the signal stack frame. If setup_rt_frame()
fails then we must not modify current->blocked.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux@lists.openrisc.net
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Jonas Bonn <jonas@southpole.se>
This commit is contained in:
Matt Fleming 2012-02-14 11:40:56 +00:00 committed by Jonas Bonn
parent b675eeb743
commit e933c70de0
1 changed files with 18 additions and 11 deletions
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29
arch/openrisc/kernel/signal.c
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@ -189,8 +189,8 @@ static inline void __user *get_sigframe(struct k_sigaction *ka,
* trampoline which performs the syscall sigreturn, or a provided
* user-mode trampoline.
*/
static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe *frame;
unsigned long return_ip;
@ -247,18 +247,23 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* actually move the usp to reflect the stacked frame */
regs->sp = (unsigned long)frame;
return;
return 0;
give_sigsegv:
force_sigsegv(sig, current);
return -EFAULT;
}
static inline void
static inline int
handle_signal(unsigned long sig,
siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
{
setup_rt_frame(sig, ka, info, oldset, regs);
int ret;
ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret)
return ret;
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
@ -267,6 +272,8 @@ handle_signal(unsigned long sig,
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
return 0;
}
/*
@ -355,13 +362,13 @@ void do_signal(struct pt_regs *regs)
oldset = &current->blocked;
/* Whee! Actually deliver the signal. */
handle_signal(signr, &info, &ka, oldset, regs);
/* a signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
* and will be restored by sigreturn, so we can simply
* clear the TIF_RESTORE_SIGMASK flag */
if (test_thread_flag(TIF_RESTORE_SIGMASK))
if (!handle_signal(signr, &info, &ka, oldset, regs)) {
/* a signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
* and will be restored by sigreturn, so we can simply
* clear the TIF_RESTORE_SIGMASK flag */
clear_thread_flag(TIF_RESTORE_SIGMASK);
}
tracehook_signal_handler(signr, &info, &ka, regs,
test_thread_flag(TIF_SINGLESTEP));