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

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Date:   Wed, 25 Apr 2018 18:03:11 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     y2038@...ts.linaro.org, linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org,
        linux-arch@...r.kernel.org, libc-alpha@...rceware.org,
        tglx@...utronix.de, netdev@...r.kernel.org, deepa.kernel@...il.com,
        viro@...iv.linux.org.uk, albert.aribaud@...ev.fr,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>
Subject: [PATCH 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 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