netdev - [PATCH v2 17/17] y2038: signal: Add compat_sys_rt_sigtimedwait

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Date:   Mon, 16 Jul 2018 18:11:03 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     tglx@...utronix.de
Cc:     y2038@...ts.linaro.org, hch@...radead.org,
        linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
        libc-alpha@...rceware.org, albert.aribaud@...ev.fr,
        netdev@...r.kernel.org, viro@...iv.linux.org.uk,
        peterz@...radead.org, dvhart@...radead.org, ebiederm@...ssion.com,
        linux@...inikbrodowski.net, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v2 17/17] y2038: signal: Add compat_sys_rt_sigtimedwait_time64

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@...db.de>
---
 kernel/signal.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/kernel/signal.c b/kernel/signal.c
index 8d4382d5182f..332f019dc421 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3172,6 +3172,38 @@ 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