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]

1 files changed, 61 insertions, 4 deletions

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 938d8908b9e0..94369f5bd8e5 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -54,7 +54,7 @@ struct __sysctl_args;
 struct sysinfo;
 struct timespec;
 struct timeval;
-struct timex;
+struct __kernel_timex;
 struct timezone;
 struct tms;
 struct utimbuf;
@@ -297,6 +297,11 @@ asmlinkage long sys_io_getevents(aio_context_t ctx_id,
 				long nr,
 				struct io_event __user *events,
 				struct __kernel_timespec __user *timeout);
+asmlinkage long sys_io_getevents_time32(__u32 ctx_id,
+				__s32 min_nr,
+				__s32 nr,
+				struct io_event __user *events,
+				struct old_timespec32 __user *timeout);
 asmlinkage long sys_io_pgetevents(aio_context_t ctx_id,
 				long min_nr,
 				long nr,
@@ -522,11 +527,19 @@ asmlinkage long sys_timerfd_settime(int ufd, int flags,
 				    const struct __kernel_itimerspec __user *utmr,
 				    struct __kernel_itimerspec __user *otmr);
 asmlinkage long sys_timerfd_gettime(int ufd, struct __kernel_itimerspec __user *otmr);
+asmlinkage long sys_timerfd_gettime32(int ufd,
+				   struct old_itimerspec32 __user *otmr);
+asmlinkage long sys_timerfd_settime32(int ufd, int flags,
+				   const struct old_itimerspec32 __user *utmr,
+				   struct old_itimerspec32 __user *otmr);
 
 /* fs/utimes.c */
 asmlinkage long sys_utimensat(int dfd, const char __user *filename,
 				struct __kernel_timespec __user *utimes,
 				int flags);
+asmlinkage long sys_utimensat_time32(unsigned int dfd,
+				const char __user *filename,
+				struct old_timespec32 __user *t, int flags);
 
 /* kernel/acct.c */
 asmlinkage long sys_acct(const char __user *name);
@@ -555,6 +568,9 @@ asmlinkage long sys_unshare(unsigned long unshare_flags);
 asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
 			struct __kernel_timespec __user *utime, u32 __user *uaddr2,
 			u32 val3);
+asmlinkage long sys_futex_time32(u32 __user *uaddr, int op, u32 val,
+			struct old_timespec32 __user *utime, u32 __user *uaddr2,
+			u32 val3);
 asmlinkage long sys_get_robust_list(int pid,
 				    struct robust_list_head __user * __user *head_ptr,
 				    size_t __user *len_ptr);
@@ -564,6 +580,8 @@ asmlinkage long sys_set_robust_list(struct robust_list_head __user *head,
 /* kernel/hrtimer.c */
 asmlinkage long sys_nanosleep(struct __kernel_timespec __user *rqtp,
 			      struct __kernel_timespec __user *rmtp);
+asmlinkage long sys_nanosleep_time32(struct old_timespec32 __user *rqtp,
+				     struct old_timespec32 __user *rmtp);
 
 /* kernel/itimer.c */
 asmlinkage long sys_getitimer(int which, struct itimerval __user *value);
@@ -591,7 +609,7 @@ asmlinkage long sys_timer_gettime(timer_t timer_id,
 asmlinkage long sys_timer_getoverrun(timer_t timer_id);
 asmlinkage long sys_timer_settime(timer_t timer_id, int flags,
 				const struct __kernel_itimerspec __user *new_setting,
-				struct itimerspec __user *old_setting);
+				struct __kernel_itimerspec __user *old_setting);
 asmlinkage long sys_timer_delete(timer_t timer_id);
 asmlinkage long sys_clock_settime(clockid_t which_clock,
 				const struct __kernel_timespec __user *tp);
@@ -602,6 +620,20 @@ asmlinkage long sys_clock_getres(clockid_t which_clock,
 asmlinkage long sys_clock_nanosleep(clockid_t which_clock, int flags,
 				const struct __kernel_timespec __user *rqtp,
 				struct __kernel_timespec __user *rmtp);
+asmlinkage long sys_timer_gettime32(timer_t timer_id,
+				 struct old_itimerspec32 __user *setting);
+asmlinkage long sys_timer_settime32(timer_t timer_id, int flags,
+					 struct old_itimerspec32 __user *new,
+					 struct old_itimerspec32 __user *old);
+asmlinkage long sys_clock_settime32(clockid_t which_clock,
+				struct old_timespec32 __user *tp);
+asmlinkage long sys_clock_gettime32(clockid_t which_clock,
+				struct old_timespec32 __user *tp);
+asmlinkage long sys_clock_getres_time32(clockid_t which_clock,
+				struct old_timespec32 __user *tp);
+asmlinkage long sys_clock_nanosleep_time32(clockid_t which_clock, int flags,
+				struct old_timespec32 __user *rqtp,
+				struct old_timespec32 __user *rmtp);
 
 /* kernel/printk.c */
 asmlinkage long sys_syslog(int type, char __user *buf, int len);
@@ -627,6 +659,8 @@ asmlinkage long sys_sched_get_priority_max(int policy);
 asmlinkage long sys_sched_get_priority_min(int policy);
 asmlinkage long sys_sched_rr_get_interval(pid_t pid,
 				struct __kernel_timespec __user *interval);
+asmlinkage long sys_sched_rr_get_interval_time32(pid_t pid,
+						 struct old_timespec32 __user *interval);
 
 /* kernel/signal.c */
 asmlinkage long sys_restart_syscall(void);
@@ -695,7 +729,8 @@ asmlinkage long sys_gettimeofday(struct timeval __user *tv,
 				struct timezone __user *tz);
 asmlinkage long sys_settimeofday(struct timeval __user *tv,
 				struct timezone __user *tz);
-asmlinkage long sys_adjtimex(struct timex __user *txc_p);
+asmlinkage long sys_adjtimex(struct __kernel_timex __user *txc_p);
+asmlinkage long sys_adjtimex_time32(struct old_timex32 __user *txc_p);
 
 /* kernel/timer.c */
 asmlinkage long sys_getpid(void);
@@ -714,6 +749,14 @@ asmlinkage long sys_mq_timedsend(mqd_t mqdes, const char __user *msg_ptr, size_t
 asmlinkage long sys_mq_timedreceive(mqd_t mqdes, char __user *msg_ptr, size_t msg_len, unsigned int __user *msg_prio, const struct __kernel_timespec __user *abs_timeout);
 asmlinkage long sys_mq_notify(mqd_t mqdes, const struct sigevent __user *notification);
 asmlinkage long sys_mq_getsetattr(mqd_t mqdes, const struct mq_attr __user *mqstat, struct mq_attr __user *omqstat);
+asmlinkage long sys_mq_timedreceive_time32(mqd_t mqdes,
+			char __user *u_msg_ptr,
+			unsigned int msg_len, unsigned int __user *u_msg_prio,
+			const struct old_timespec32 __user *u_abs_timeout);
+asmlinkage long sys_mq_timedsend_time32(mqd_t mqdes,
+			const char __user *u_msg_ptr,
+			unsigned int msg_len, unsigned int msg_prio,
+			const struct old_timespec32 __user *u_abs_timeout);
 
 /* ipc/msg.c */
 asmlinkage long sys_msgget(key_t key, int msgflg);
@@ -731,6 +774,9 @@ asmlinkage long sys_old_semctl(int semid, int semnum, int cmd, unsigned long arg
 asmlinkage long sys_semtimedop(int semid, struct sembuf __user *sops,
 				unsigned nsops,
 				const struct __kernel_timespec __user *timeout);
+asmlinkage long sys_semtimedop_time32(int semid, struct sembuf __user *sops,
+				unsigned nsops,
+				const struct old_timespec32 __user *timeout);
 asmlinkage long sys_semop(int semid, struct sembuf __user *sops,
 				unsigned nsops);
 
@@ -870,7 +916,9 @@ asmlinkage long sys_open_by_handle_at(int mountdirfd,
 				      struct file_handle __user *handle,
 				      int flags);
 asmlinkage long sys_clock_adjtime(clockid_t which_clock,
-				struct timex __user *tx);
+				struct __kernel_timex __user *tx);
+asmlinkage long sys_clock_adjtime32(clockid_t which_clock,
+				struct old_timex32 __user *tx);
 asmlinkage long sys_syncfs(int fd);
 asmlinkage long sys_setns(int fd, int nstype);
 asmlinkage long sys_sendmmsg(int fd, struct mmsghdr __user *msg,
@@ -1006,6 +1054,7 @@ asmlinkage long sys_alarm(unsigned int seconds);
 asmlinkage long sys_getpgrp(void);
 asmlinkage long sys_pause(void);
 asmlinkage long sys_time(time_t __user *tloc);
+asmlinkage long sys_time32(old_time32_t __user *tloc);
 #ifdef __ARCH_WANT_SYS_UTIME
 asmlinkage long sys_utime(char __user *filename,
 				struct utimbuf __user *times);
@@ -1014,6 +1063,13 @@ asmlinkage long sys_utimes(char __user *filename,
 asmlinkage long sys_futimesat(int dfd, const char __user *filename,
 			      struct timeval __user *utimes);
 #endif
+asmlinkage long sys_futimesat_time32(unsigned int dfd,
+				     const char __user *filename,
+				     struct old_timeval32 __user *t);
+asmlinkage long sys_utime32(const char __user *filename,
+				 struct old_utimbuf32 __user *t);
+asmlinkage long sys_utimes_time32(const char __user *filename,
+				  struct old_timeval32 __user *t);
 asmlinkage long sys_creat(const char __user *pathname, umode_t mode);
 asmlinkage long sys_getdents(unsigned int fd,
 				struct linux_dirent __user *dirent,
@@ -1038,6 +1094,7 @@ asmlinkage long sys_fork(void);
 
 /* obsolete: kernel/time/time.c */
 asmlinkage long sys_stime(time_t __user *tptr);
+asmlinkage long sys_stime32(old_time32_t __user *tptr);
 
 /* obsolete: kernel/signal.c */
 asmlinkage long sys_sigpending(old_sigset_t __user *uset);