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Subject[PATCH 17/17] y2038: signal: Add compat_sys_rt_sigtimedwait_time64
Date
Now that 32-bit architectures have two variants of
sys_rt_sigtimedwaid() for 32-bit and 64-bit time_t, we also
need to have a second compat system call entry point on the
corresponding 64-bit architectures.

The traditional system call keeps getting handled
by compat_sys_rt_sigtimedwait(), and this adds a new
compat_sys_rt_sigtimedwait_time64() that differs only in
the timeout argument type.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
kernel/signal.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/kernel/signal.c b/kernel/signal.c
index 72609c6835fd..1927fcfa7077 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3249,6 +3249,38 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
}
#endif

+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait_time64, compat_sigset_t __user *, uthese,
+ struct compat_siginfo __user *, uinfo,
+ struct __kernel_timespec __user *, uts, compat_size_t, sigsetsize)
+{
+ sigset_t s;
+ struct timespec64 t;
+ siginfo_t info;
+ long ret;
+
+ if (sigsetsize != sizeof(sigset_t))
+ return -EINVAL;
+
+ if (get_compat_sigset(&s, uthese))
+ return -EFAULT;
+
+ if (uts) {
+ if (get_timespec64(&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
--
2.9.0
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