Merge tag 'y2038-new-syscalls' of git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground into timers/2038

Pull y2038 - time64 system calls from Arnd Bergmann:

This series finally gets us to the point of having system calls with 64-bit
time_t on all architectures, after a long time of incremental preparation
patches.

There was actually one conversion that I missed during the summer,
i.e. Deepa's timex series, which I now updated based the 5.0-rc1 changes
and review comments.

The following system calls are now added on all 32-bit architectures using
the same system call numbers:

403 clock_gettime64
404 clock_settime64
405 clock_adjtime64
406 clock_getres_time64
407 clock_nanosleep_time64
408 timer_gettime64
409 timer_settime64
410 timerfd_gettime64
411 timerfd_settime64
412 utimensat_time64
413 pselect6_time64
414 ppoll_time64
416 io_pgetevents_time64
417 recvmmsg_time64
418 mq_timedsend_time64
419 mq_timedreceiv_time64
420 semtimedop_time64
421 rt_sigtimedwait_time64
422 futex_time64
423 sched_rr_get_interval_time64

Each one of these corresponds directly to an existing system call that
includes a 'struct timespec' argument, or a structure containing a timespec
or (in case of clock_adjtime) timeval. Not included here are new versions
of getitimer/setitimer and getrusage/waitid, which are planned for the
future but only needed to make a consistent API rather than for correct
operation beyond y2038. These four system calls are based on 'timeval', and
it has not been finally decided what the replacement kernel interface will
use instead.

So far, I have done a lot of build testing across most architectures, which
has found a number of bugs. Runtime testing so far included testing LTP on
32-bit ARM with the existing system calls, to ensure we do not regress for
existing binaries, and a test with a 32-bit x86 build of LTP against a
modified version of the musl C library that has been adapted to the new
system call interface [3].  This library can be used for testing on all
architectures supported by musl-1.1.21, but it is not how the support is
getting integrated into the official musl release. Official musl support is
planned but will require more invasive changes to the library.

Link: https://lore.kernel.org/lkml/20190110162435.309262-1-arnd@arndb.de/T/
Link: https://lore.kernel.org/lkml/20190118161835.2259170-1-arnd@arndb.de/
Link: https://git.linaro.org/people/arnd/musl-y2038.git/ [2]

4 files changed, 14 insertions, 14 deletions

diff --git a/fs/aio.c b/fs/aio.c
index b906ff70c90f..4394d3fe116a 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -2198,11 +2198,11 @@ SYSCALL_DEFINE6(io_pgetevents_time32,
 
 #if defined(CONFIG_COMPAT_32BIT_TIME)
 
-COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id,
-		       compat_long_t, min_nr,
-		       compat_long_t, nr,
-		       struct io_event __user *, events,
-		       struct old_timespec32 __user *, timeout)
+SYSCALL_DEFINE5(io_getevents_time32, __u32, ctx_id,
+		__s32, min_nr,
+		__s32, nr,
+		struct io_event __user *, events,
+		struct old_timespec32 __user *, timeout)
 {
 	struct timespec64 t;
 	int ret;
diff --git a/fs/select.c b/fs/select.c
index d0f35dbc0e8f..6cbc9ff56ba0 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -1379,7 +1379,7 @@ COMPAT_SYSCALL_DEFINE6(pselect6_time64, int, n, compat_ulong_t __user *, inp,
 
 #if defined(CONFIG_COMPAT_32BIT_TIME)
 
-COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
+COMPAT_SYSCALL_DEFINE6(pselect6_time32, int, n, compat_ulong_t __user *, inp,
 	compat_ulong_t __user *, outp, compat_ulong_t __user *, exp,
 	struct old_timespec32 __user *, tsp, void __user *, sig)
 {
@@ -1402,7 +1402,7 @@ COMPAT_SYSCALL_DEFINE6(pselect6, int, n, compat_ulong_t __user *, inp,
 #endif
 
 #if defined(CONFIG_COMPAT_32BIT_TIME)
-COMPAT_SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds,
+COMPAT_SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds,
 	unsigned int,  nfds, struct old_timespec32 __user *, tsp,
 	const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize)
 {
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 803ca070d42e..6a6fc8aa1de7 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -560,7 +560,7 @@ SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct __kernel_itimerspec __user *,
 }
 
 #ifdef CONFIG_COMPAT_32BIT_TIME
-COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
+SYSCALL_DEFINE4(timerfd_settime32, int, ufd, int, flags,
 		const struct old_itimerspec32 __user *, utmr,
 		struct old_itimerspec32 __user *, otmr)
 {
@@ -577,7 +577,7 @@ COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
 	return ret;
 }
 
-COMPAT_SYSCALL_DEFINE2(timerfd_gettime, int, ufd,
+SYSCALL_DEFINE2(timerfd_gettime32, int, ufd,
 		struct old_itimerspec32 __user *, otmr)
 {
 	struct itimerspec64 kotmr;
diff --git a/fs/utimes.c b/fs/utimes.c
index bdcf2daf39c1..350c9c16ace1 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -224,8 +224,8 @@ SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times)
  * of sys_utimes.
  */
 #ifdef __ARCH_WANT_SYS_UTIME32
-COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
-		       struct old_utimbuf32 __user *, t)
+SYSCALL_DEFINE2(utime32, const char __user *, filename,
+		struct old_utimbuf32 __user *, t)
 {
 	struct timespec64 tv[2];
 
@@ -240,7 +240,7 @@ COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
 }
 #endif
 
-COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct old_timespec32 __user *, t, int, flags)
+SYSCALL_DEFINE4(utimensat_time32, unsigned int, dfd, const char __user *, filename, struct old_timespec32 __user *, t, int, flags)
 {
 	struct timespec64 tv[2];
 
@@ -276,14 +276,14 @@ static long do_compat_futimesat(unsigned int dfd, const char __user *filename,
 	return do_utimes(dfd, filename, t ? tv : NULL, 0);
 }
 
-COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd,
+SYSCALL_DEFINE3(futimesat_time32, unsigned int, dfd,
 		       const char __user *, filename,
 		       struct old_timeval32 __user *, t)
 {
 	return do_compat_futimesat(dfd, filename, t);
 }
 
-COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct old_timeval32 __user *, t)
+SYSCALL_DEFINE2(utimes_time32, const char __user *, filename, struct old_timeval32 __user *, t)
 {
 	return do_compat_futimesat(AT_FDCWD, filename, t);
 }