As part of the work to make these system calls handle 64-bit time_t, we move the compat handling closer to the actual system calls. The next step is to combine the actual implementation.
Signed-off-by: Arnd Bergmann <[email protected]> --- include/linux/compat_time.h | 4 + include/linux/posix-timers.h | 2 - kernel/compat.c | 177 +------------------------------------------ kernel/time/posix-timers.c | 174 +++++++++++++++++++++++++++++++++++++++++- 4 files changed, 179 insertions(+), 178 deletions(-) diff --git a/include/linux/compat_time.h b/include/linux/compat_time.h index 37c3860d97fa..afaa1ca7986d 100644 --- a/include/linux/compat_time.h +++ b/include/linux/compat_time.h @@ -120,6 +120,10 @@ extern int compat_get_timeval(struct timeval *, const void __user *); extern int compat_put_timeval(const struct timeval *, void __user *); extern int compat_get_timespec64(struct timespec64 *ts, const void __user *uts); extern int compat_put_timespec64(const struct timespec64 *ts, void __user *uts); +struct compat_timex; +struct timex; +extern int compat_get_timex(struct timex *txc, struct compat_timex __user *utp); +extern int compat_put_timex(struct compat_timex __user *utp, struct timex *txc); /* * This function convert a timespec if necessary and returns a *user diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index bc44076f7e0b..2d676be022e4 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -134,8 +134,6 @@ bool posix_cpu_timers_can_stop_tick(struct task_struct *tsk); void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, cputime_t *newval, cputime_t *oldval); -long clock_nanosleep_restart(struct restart_block *restart_block); - void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); int get_itimerspec(struct itimerspec *it, const struct __kernel_itimerspec __user *uit); diff --git a/kernel/compat.c b/kernel/compat.c index 13653247ba6c..22a20bd37a73 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -33,7 +33,7 @@ #include <asm/uaccess.h> #ifdef CONFIG_COMPAT_TIME -static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) +int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) { memset(txc, 0, sizeof(struct timex)); @@ -63,7 +63,7 @@ static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) return 0; } -static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc) +int compat_put_timex(struct compat_timex __user *utp, struct timex *txc) { if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || __put_user(txc->modes, &utp->modes) || @@ -743,180 +743,7 @@ COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, return sys_timer_create(which_clock, event, created_timer_id); } -#endif - -#ifdef CONFIG_COMPAT_TIME -COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, - struct compat_itimerspec __user *, new, - struct compat_itimerspec __user *, old) -{ - long err; - mm_segment_t oldfs; - struct itimerspec newts, oldts; - - if (!new) - return -EINVAL; - if (get_compat_itimerspec(&newts, new)) - return -EFAULT; - oldfs = get_fs(); - set_fs(KERNEL_DS); - err = sys_timer_settime(timer_id, flags, - (struct itimerspec __user *) &newts, - (struct itimerspec __user *) &oldts); - set_fs(oldfs); - if (!err && old && put_compat_itimerspec(old, &oldts)) - return -EFAULT; - return err; -} - -COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, - struct compat_itimerspec __user *, setting) -{ - long err; - mm_segment_t oldfs; - struct itimerspec ts; - - oldfs = get_fs(); - set_fs(KERNEL_DS); - err = sys_timer_gettime(timer_id, - (struct itimerspec __user *) &ts); - set_fs(oldfs); - if (!err && put_compat_itimerspec(setting, &ts)) - return -EFAULT; - return err; -} - -COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, - struct compat_timespec __user *, tp) -{ - long err; - mm_segment_t oldfs; - struct timespec ts; - if (compat_get_timespec(&ts, tp)) - return -EFAULT; - oldfs = get_fs(); - set_fs(KERNEL_DS); - err = sys_clock_settime(which_clock, - (struct timespec __user *) &ts); - set_fs(oldfs); - return err; -} - -COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, - struct compat_timespec __user *, tp) -{ - long err; - mm_segment_t oldfs; - struct timespec ts; - - oldfs = get_fs(); - set_fs(KERNEL_DS); - err = sys_clock_gettime(which_clock, - (struct timespec __user *) &ts); - set_fs(oldfs); - if (!err && compat_put_timespec(&ts, tp)) - return -EFAULT; - return err; -} - -COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, - struct compat_timex __user *, utp) -{ - struct timex txc; - mm_segment_t oldfs; - int err, ret; - - err = compat_get_timex(&txc, utp); - if (err) - return err; - - oldfs = get_fs(); - set_fs(KERNEL_DS); - ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); - set_fs(oldfs); - - err = compat_put_timex(utp, &txc); - if (err) - return err; - - return ret; -} - -COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, - struct compat_timespec __user *, tp) -{ - long err; - mm_segment_t oldfs; - struct timespec ts; - - oldfs = get_fs(); - set_fs(KERNEL_DS); - err = sys_clock_getres(which_clock, - (struct timespec __user *) &ts); - set_fs(oldfs); - if (!err && tp && compat_put_timespec(&ts, tp)) - return -EFAULT; - return err; -} - -static long compat_clock_nanosleep_restart(struct restart_block *restart) -{ - long err; - mm_segment_t oldfs; - struct timespec tu; - struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp; - - restart->nanosleep.rmtp = (struct timespec __user *) &tu; - oldfs = get_fs(); - set_fs(KERNEL_DS); - err = clock_nanosleep_restart(restart); - set_fs(oldfs); - - if ((err == -ERESTART_RESTARTBLOCK) && rmtp && - compat_put_timespec(&tu, rmtp)) - return -EFAULT; - - if (err == -ERESTART_RESTARTBLOCK) { - restart->fn = compat_clock_nanosleep_restart; - restart->nanosleep.compat_rmtp = rmtp; - } - return err; -} - -COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, - struct compat_timespec __user *, rqtp, - struct compat_timespec __user *, rmtp) -{ - long err; - mm_segment_t oldfs; - struct timespec in, out; - struct restart_block *restart; - - if (compat_get_timespec(&in, rqtp)) - return -EFAULT; - - oldfs = get_fs(); - set_fs(KERNEL_DS); - err = sys_clock_nanosleep(which_clock, flags, - (struct timespec __user *) &in, - (struct timespec __user *) &out); - set_fs(oldfs); - - if ((err == -ERESTART_RESTARTBLOCK) && rmtp && - compat_put_timespec(&out, rmtp)) - return -EFAULT; - - if (err == -ERESTART_RESTARTBLOCK) { - restart = ¤t->restart_block; - restart->fn = compat_clock_nanosleep_restart; - restart->nanosleep.compat_rmtp = rmtp; - } - return err; -} -#endif - -#ifdef CONFIG_COMPAT /* * We currently only need the following fields from the sigevent * structure: sigev_value, sigev_signo, sig_notify and (sometimes diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index c99b10725025..4c0d43c7c015 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -39,6 +39,7 @@ #include <asm/uaccess.h> #include <linux/list.h> #include <linux/init.h> +#include <linux/compat.h> #include <linux/compiler.h> #include <linux/hash.h> #include <linux/posix-clock.h> @@ -1146,7 +1147,7 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, * This will restart clock_nanosleep. This is required only by * compat_clock_nanosleep_restart for now. */ -long clock_nanosleep_restart(struct restart_block *restart_block) +static long clock_nanosleep_restart(struct restart_block *restart_block) { clockid_t which_clock = restart_block->nanosleep.clockid; struct k_clock *kc = clockid_to_kclock(which_clock); @@ -1156,3 +1157,174 @@ long clock_nanosleep_restart(struct restart_block *restart_block) return kc->nsleep_restart(restart_block); } + +#ifdef CONFIG_COMPAT_TIME +COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, + struct compat_itimerspec __user *, new, + struct compat_itimerspec __user *, old) +{ + long err; + mm_segment_t oldfs; + struct itimerspec newts, oldts; + + if (!new) + return -EINVAL; + if (get_compat_itimerspec(&newts, new)) + return -EFAULT; + oldfs = get_fs(); + set_fs(KERNEL_DS); + err = sys_timer_settime(timer_id, flags, + (struct itimerspec __user *) &newts, + (struct itimerspec __user *) &oldts); + set_fs(oldfs); + if (!err && old && put_compat_itimerspec(old, &oldts)) + return -EFAULT; + return err; +} + +COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, + struct compat_itimerspec __user *, setting) +{ + long err; + mm_segment_t oldfs; + struct itimerspec ts; + + oldfs = get_fs(); + set_fs(KERNEL_DS); + err = sys_timer_gettime(timer_id, + (struct itimerspec __user *) &ts); + set_fs(oldfs); + if (!err && put_compat_itimerspec(setting, &ts)) + return -EFAULT; + return err; +} + +COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, + struct compat_timespec __user *, tp) +{ + long err; + mm_segment_t oldfs; + struct timespec ts; + + if (compat_get_timespec(&ts, tp)) + return -EFAULT; + oldfs = get_fs(); + set_fs(KERNEL_DS); + err = sys_clock_settime(which_clock, + (struct timespec __user *) &ts); + set_fs(oldfs); + return err; +} + +COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, + struct compat_timespec __user *, tp) +{ + long err; + mm_segment_t oldfs; + struct timespec ts; + + oldfs = get_fs(); + set_fs(KERNEL_DS); + err = sys_clock_gettime(which_clock, + (struct timespec __user *) &ts); + set_fs(oldfs); + if (!err && compat_put_timespec(&ts, tp)) + return -EFAULT; + return err; +} + +COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, + struct compat_timex __user *, utp) +{ + struct timex txc; + mm_segment_t oldfs; + int err, ret; + + err = compat_get_timex(&txc, utp); + if (err) + return err; + + oldfs = get_fs(); + set_fs(KERNEL_DS); + ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); + set_fs(oldfs); + + err = compat_put_timex(utp, &txc); + if (err) + return err; + + return ret; +} + +COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, + struct compat_timespec __user *, tp) +{ + long err; + mm_segment_t oldfs; + struct timespec ts; + + oldfs = get_fs(); + set_fs(KERNEL_DS); + err = sys_clock_getres(which_clock, + (struct timespec __user *) &ts); + set_fs(oldfs); + if (!err && tp && compat_put_timespec(&ts, tp)) + return -EFAULT; + return err; +} + +static long compat_clock_nanosleep_restart(struct restart_block *restart) +{ + long err; + mm_segment_t oldfs; + struct timespec tu; + struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp; + + restart->nanosleep.rmtp = (struct timespec __user *) &tu; + oldfs = get_fs(); + set_fs(KERNEL_DS); + err = clock_nanosleep_restart(restart); + set_fs(oldfs); + + if ((err == -ERESTART_RESTARTBLOCK) && rmtp && + compat_put_timespec(&tu, rmtp)) + return -EFAULT; + + if (err == -ERESTART_RESTARTBLOCK) { + restart->fn = compat_clock_nanosleep_restart; + restart->nanosleep.compat_rmtp = rmtp; + } + return err; +} + +COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, + struct compat_timespec __user *, rqtp, + struct compat_timespec __user *, rmtp) +{ + long err; + mm_segment_t oldfs; + struct timespec in, out; + struct restart_block *restart; + + if (compat_get_timespec(&in, rqtp)) + return -EFAULT; + + oldfs = get_fs(); + set_fs(KERNEL_DS); + err = sys_clock_nanosleep(which_clock, flags, + (struct timespec __user *) &in, + (struct timespec __user *) &out); + set_fs(oldfs); + + if ((err == -ERESTART_RESTARTBLOCK) && rmtp && + compat_put_timespec(&out, rmtp)) + return -EFAULT; + + if (err == -ERESTART_RESTARTBLOCK) { + restart = ¤t->restart_block; + restart->fn = compat_clock_nanosleep_restart; + restart->nanosleep.compat_rmtp = rmtp; + } + return err; +} +#endif -- 2.1.0.rc2 _______________________________________________ Y2038 mailing list [email protected] https://lists.linaro.org/mailman/listinfo/y2038
