diff options
Diffstat (limited to 'fs/timerfd.c')
| -rw-r--r-- | fs/timerfd.c | 85 |
1 files changed, 66 insertions, 19 deletions
diff --git a/fs/timerfd.c b/fs/timerfd.c index d03822bbf19..0e606b12a59 100644 --- a/fs/timerfd.c +++ b/fs/timerfd.c @@ -22,6 +22,7 @@ #include <linux/anon_inodes.h> #include <linux/timerfd.h> #include <linux/syscalls.h> +#include <linux/compat.h> #include <linux/rcupdate.h> struct timerfd_ctx { @@ -278,21 +279,17 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags) return ufd; } -SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags, - const struct itimerspec __user *, utmr, - struct itimerspec __user *, otmr) +static int do_timerfd_settime(int ufd, int flags, + const struct itimerspec *new, + struct itimerspec *old) { struct fd f; struct timerfd_ctx *ctx; - struct itimerspec ktmr, kotmr; int ret; - if (copy_from_user(&ktmr, utmr, sizeof(ktmr))) - return -EFAULT; - if ((flags & ~TFD_SETTIME_FLAGS) || - !timespec_valid(&ktmr.it_value) || - !timespec_valid(&ktmr.it_interval)) + !timespec_valid(&new->it_value) || + !timespec_valid(&new->it_interval)) return -EINVAL; ret = timerfd_fget(ufd, &f); @@ -323,27 +320,23 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags, if (ctx->expired && ctx->tintv.tv64) hrtimer_forward_now(&ctx->tmr, ctx->tintv); - kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx)); - kotmr.it_interval = ktime_to_timespec(ctx->tintv); + old->it_value = ktime_to_timespec(timerfd_get_remaining(ctx)); + old->it_interval = ktime_to_timespec(ctx->tintv); /* * Re-program the timer to the new value ... */ - ret = timerfd_setup(ctx, flags, &ktmr); + ret = timerfd_setup(ctx, flags, new); spin_unlock_irq(&ctx->wqh.lock); fdput(f); - if (otmr && copy_to_user(otmr, &kotmr, sizeof(kotmr))) - return -EFAULT; - return ret; } -SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr) +static int do_timerfd_gettime(int ufd, struct itimerspec *t) { struct fd f; struct timerfd_ctx *ctx; - struct itimerspec kotmr; int ret = timerfd_fget(ufd, &f); if (ret) return ret; @@ -356,11 +349,65 @@ SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr) hrtimer_forward_now(&ctx->tmr, ctx->tintv) - 1; hrtimer_restart(&ctx->tmr); } - kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx)); - kotmr.it_interval = ktime_to_timespec(ctx->tintv); + t->it_value = ktime_to_timespec(timerfd_get_remaining(ctx)); + t->it_interval = ktime_to_timespec(ctx->tintv); spin_unlock_irq(&ctx->wqh.lock); fdput(f); + return 0; +} + +SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags, + const struct itimerspec __user *, utmr, + struct itimerspec __user *, otmr) +{ + struct itimerspec new, old; + int ret; + + if (copy_from_user(&new, utmr, sizeof(new))) + return -EFAULT; + ret = do_timerfd_settime(ufd, flags, &new, &old); + if (ret) + return ret; + if (otmr && copy_to_user(otmr, &old, sizeof(old))) + return -EFAULT; + + return ret; +} +SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr) +{ + struct itimerspec kotmr; + int ret = do_timerfd_gettime(ufd, &kotmr); + if (ret) + return ret; return copy_to_user(otmr, &kotmr, sizeof(kotmr)) ? -EFAULT: 0; } +#ifdef COMPAT +COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags, + const struct itimerspec __user *, utmr, + struct itimerspec __user *, otmr) +{ + struct itimerspec new, old; + int ret; + + if (get_compat_itimerspec(&new, utmr)) + return -EFAULT; + ret = do_timerfd_settime(ufd, flags, &new, &old); + if (ret) + return ret; + if (otmr && put_compat_itimerspec(otmr, &old)) + return -EFAULT; + return ret; +} + +COMPAT_SYSCALL_DEFINE2(timerfd_gettime, int, ufd, + struct itimerspec __user *, otmr) +{ + struct itimerspec kotmr; + int ret = do_timerfd_gettime(ufd, &kotmr); + if (ret) + return ret; + return put_compat_itimerspec(otmr, &t) ? -EFAULT: 0; +} +#endif |