diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2010-10-03 01:15:49 -0400 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2011-01-07 14:01:34 +0100 |
| commit | f85741eb5fb2653fd9138b4bef68396615c720f7 (patch) | |
| tree | cf57bfb2816c43ab7bc832ce1535b92000b20af0 /arch/m68k | |
| parent | 9e4930dbf17c1eba72631cd52a0c621da3d1a816 (diff) | |
m68k: Don't lose state if sigframe setup fails
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>
Diffstat (limited to 'arch/m68k')
| -rw-r--r-- | arch/m68k/kernel/signal.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c index a18b251fe59..a6dd61418e7 100644 --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -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(¤t->blocked,¤t->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; } |