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Subject[PATCH 4/5] y2038: signal: Add sys_rt_sigtimedwait_time32
Date
Once sys_rt_sigtimedwait() gets changed to a 64-bit time_t, we have
to provide compatibility support for existing binaries.

An earlier version of this patch reused the compat_sys_rt_sigtimedwait
entry point to avoid code duplication, but this newer approach
duplicates the existing native entry point instead, which seems
a bit cleaner.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
include/linux/syscalls.h | 4 ++++
kernel/signal.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 03cda6793be3..251979d2e709 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -649,6 +649,10 @@ asmlinkage long sys_rt_sigtimedwait(const sigset_t __user *uthese,
siginfo_t __user *uinfo,
const struct __kernel_timespec __user *uts,
size_t sigsetsize);
+asmlinkage long sys_rt_sigtimedwait_time32(const sigset_t __user *uthese,
+ siginfo_t __user *uinfo,
+ const struct old_timespec32 __user *uts,
+ size_t sigsetsize);
asmlinkage long sys_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t __user *uinfo);

/* kernel/sys.c */
diff --git a/kernel/signal.c b/kernel/signal.c
index 3c8ea7a328e0..be6744cd0a11 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3332,6 +3332,39 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
return ret;
}

+#ifdef CONFIG_COMPAT_32BIT_TIME
+SYSCALL_DEFINE4(rt_sigtimedwait_time32, const sigset_t __user *, uthese,
+ siginfo_t __user *, uinfo,
+ const struct old_timespec32 __user *, uts,
+ size_t, sigsetsize)
+{
+ sigset_t these;
+ struct timespec64 ts;
+ kernel_siginfo_t info;
+ int ret;
+
+ if (sigsetsize != sizeof(sigset_t))
+ return -EINVAL;
+
+ if (copy_from_user(&these, uthese, sizeof(these)))
+ return -EFAULT;
+
+ if (uts) {
+ if (get_old_timespec32(&ts, uts))
+ return -EFAULT;
+ }
+
+ ret = do_sigtimedwait(&these, &info, uts ? &ts : NULL);
+
+ if (ret > 0 && uinfo) {
+ if (copy_siginfo_to_user(uinfo, &info))
+ ret = -EFAULT;
+ }
+
+ return ret;
+}
+#endif
+
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
struct compat_siginfo __user *, uinfo,
--
2.18.0
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