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m68k: Don't lose state if sigframe setup fails

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If we'd failed in setup_frame(), we've no place to store
the original sigmask.  It's not an unrecoverable situation -
we raise SIGSEGV, but that SIGSEGV might be successfully
handled (e.g. on altstack).  In that case we really don't
want sa_mask of original signal permanently slapped on
the set of blocked signals.

Standard solution: have setup_frame()/setup_rt_frame()
report failure and don't mess with the signal-related
state if that has happened...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Al Viro 2010-10-03 01:15:49 -04:00 committed by Geert Uytterhoeven
parent 9e4930dbf1
commit f85741eb5f
1 changed files with 12 additions and 7 deletions
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19
arch/m68k/kernel/signal.c
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@ -743,7 +743,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
return (void __user *)((usp - frame_size) & -8UL);
}
static void setup_frame (int sig, struct k_sigaction *ka,
static int setup_frame (int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs *regs)
{
struct sigframe __user *frame;
@ -813,14 +813,14 @@ adjust_stack:
tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
return;
return err;
give_sigsegv:
force_sigsegv(sig, current);
goto adjust_stack;
}
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;
@ -901,7 +901,7 @@ adjust_stack:
tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
return;
return err;
give_sigsegv:
force_sigsegv(sig, current);
@ -963,6 +963,7 @@ static void
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs)
{
int err;
/* are we from a system call? */
if (regs->orig_d0 >= 0)
/* If so, check system call restarting.. */
@ -970,9 +971,12 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
/* set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
setup_rt_frame(sig, ka, info, oldset, regs);
err = setup_rt_frame(sig, ka, info, oldset, regs);
else
setup_frame(sig, ka, oldset, regs);
err = setup_frame(sig, ka, oldset, regs);
if (err)
return;
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NODEFER))
@ -983,6 +987,8 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->sr &= ~0x8000;
send_sig(SIGTRAP, current, 1);
}
clear_thread_flag(TIF_RESTORE_SIGMASK);
}
/*
@ -1008,7 +1014,6 @@ asmlinkage void do_signal(struct pt_regs *regs)
if (signr > 0) {
/* Whee! Actually deliver the signal. */
handle_signal(signr, &ka, &info, oldset, regs);
clear_thread_flag(TIF_RESTORE_SIGMASK);
return;
}