rt_sigtimedwait(): move compat to native

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 35 insertions, 1 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 6237f492adfc..fe5b3608c31c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2768,7 +2768,7 @@ int copy_siginfo_to_user(siginfo_t __user *to, const siginfo_t *from)
  *  @info: if non-null, the signal's siginfo is returned here
  *  @ts: upper bound on process time suspension
  */
-int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
+static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
 		    const struct timespec *ts)
 {
 	ktime_t *to = NULL, timeout = KTIME_MAX;
@@ -2857,6 +2857,40 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
+		struct compat_siginfo __user *, uinfo,
+		struct compat_timespec __user *, uts, compat_size_t, sigsetsize)
+{
+	compat_sigset_t s32;
+	sigset_t s;
+	struct timespec t;
+	siginfo_t info;
+	long ret;
+
+	if (sigsetsize != sizeof(sigset_t))
+		return -EINVAL;
+
+	if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
+		return -EFAULT;
+	sigset_from_compat(&s, &s32);
+
+	if (uts) {
+		if (compat_get_timespec(&t, uts))
+			return -EFAULT;
+	}
+
+	ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
+
+	if (ret > 0 && uinfo) {
+		if (copy_siginfo_to_user32(uinfo, &info))
+			ret = -EFAULT;
+	}
+
+	return ret;
+}
+#endif
+
 /**
  *  sys_kill - send a signal to a process
  *  @pid: the PID of the process