diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-18 15:29:16 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-12-19 18:07:40 -0500 |
| commit | 5c49574ffd7ac07eae8c3b065d19e6ebc7e4760f (patch) | |
| tree | 10c25476b152eca9917eea82fbecff28718eb2fc | |
| parent | 031b6566983ad9c0247087f039af22b3f87596a3 (diff) | |
new helper: restore_altstack()
to be used by rt_sigreturn instances
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | include/linux/signal.h | 2 | ||||
| -rw-r--r-- | kernel/signal.c | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/signal.h b/include/linux/signal.h index e19a011b43b7..5969522136fe 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -385,4 +385,6 @@ int unhandled_signal(struct task_struct *tsk, int sig); void signals_init(void); +int restore_altstack(const stack_t __user *); + #endif /* _LINUX_SIGNAL_H */ diff --git a/kernel/signal.c b/kernel/signal.c index e75e4bd2839b..887f2fefe207 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -3103,6 +3103,13 @@ out: return error; } +int restore_altstack(const stack_t __user *uss) +{ + int err = do_sigaltstack(uss, NULL, current_user_stack_pointer()); + /* squash all but EFAULT for now */ + return err == -EFAULT ? err : 0; +} + #ifdef __ARCH_WANT_SYS_SIGPENDING /** |