From 5c49574ffd7ac07eae8c3b065d19e6ebc7e4760f Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 18 Nov 2012 15:29:16 -0500 Subject: new helper: restore_altstack() to be used by rt_sigreturn instances Signed-off-by: Al Viro --- kernel/signal.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'kernel/signal.c') diff --git a/kernel/signal.c b/kernel/signal.c index e75e4bd2839..887f2fefe20 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 /** -- cgit v1.2.3-18-g5258