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Diffstat (limited to 'fs/timerfd.c')
-rw-r--r--fs/timerfd.c68
1 files changed, 39 insertions, 29 deletions
diff --git a/fs/timerfd.c b/fs/timerfd.c
index c173cc196175..ece0c02d7e63 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -40,6 +40,7 @@ struct timerfd_ctx {
short unsigned settime_flags; /* to show in fdinfo */
struct rcu_head rcu;
struct list_head clist;
+ spinlock_t cancel_lock;
bool might_cancel;
};
@@ -112,7 +113,7 @@ void timerfd_clock_was_set(void)
rcu_read_unlock();
}
-static void timerfd_remove_cancel(struct timerfd_ctx *ctx)
+static void __timerfd_remove_cancel(struct timerfd_ctx *ctx)
{
if (ctx->might_cancel) {
ctx->might_cancel = false;
@@ -122,6 +123,13 @@ static void timerfd_remove_cancel(struct timerfd_ctx *ctx)
}
}
+static void timerfd_remove_cancel(struct timerfd_ctx *ctx)
+{
+ spin_lock(&ctx->cancel_lock);
+ __timerfd_remove_cancel(ctx);
+ spin_unlock(&ctx->cancel_lock);
+}
+
static bool timerfd_canceled(struct timerfd_ctx *ctx)
{
if (!ctx->might_cancel || ctx->moffs != KTIME_MAX)
@@ -132,6 +140,7 @@ static bool timerfd_canceled(struct timerfd_ctx *ctx)
static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags)
{
+ spin_lock(&ctx->cancel_lock);
if ((ctx->clockid == CLOCK_REALTIME ||
ctx->clockid == CLOCK_REALTIME_ALARM) &&
(flags & TFD_TIMER_ABSTIME) && (flags & TFD_TIMER_CANCEL_ON_SET)) {
@@ -141,9 +150,10 @@ static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags)
list_add_rcu(&ctx->clist, &cancel_list);
spin_unlock(&cancel_lock);
}
- } else if (ctx->might_cancel) {
- timerfd_remove_cancel(ctx);
+ } else {
+ __timerfd_remove_cancel(ctx);
}
+ spin_unlock(&ctx->cancel_lock);
}
static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx)
@@ -159,7 +169,7 @@ static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx)
}
static int timerfd_setup(struct timerfd_ctx *ctx, int flags,
- const struct itimerspec *ktmr)
+ const struct itimerspec64 *ktmr)
{
enum hrtimer_mode htmode;
ktime_t texp;
@@ -168,10 +178,10 @@ static int timerfd_setup(struct timerfd_ctx *ctx, int flags,
htmode = (flags & TFD_TIMER_ABSTIME) ?
HRTIMER_MODE_ABS: HRTIMER_MODE_REL;
- texp = timespec_to_ktime(ktmr->it_value);
+ texp = timespec64_to_ktime(ktmr->it_value);
ctx->expired = 0;
ctx->ticks = 0;
- ctx->tintv = timespec_to_ktime(ktmr->it_interval);
+ ctx->tintv = timespec64_to_ktime(ktmr->it_interval);
if (isalarm(ctx)) {
alarm_init(&ctx->t.alarm,
@@ -390,9 +400,9 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
clockid != CLOCK_BOOTTIME_ALARM))
return -EINVAL;
- if (!capable(CAP_WAKE_ALARM) &&
- (clockid == CLOCK_REALTIME_ALARM ||
- clockid == CLOCK_BOOTTIME_ALARM))
+ if ((clockid == CLOCK_REALTIME_ALARM ||
+ clockid == CLOCK_BOOTTIME_ALARM) &&
+ !capable(CAP_WAKE_ALARM))
return -EPERM;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
@@ -400,6 +410,7 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
return -ENOMEM;
init_waitqueue_head(&ctx->wqh);
+ spin_lock_init(&ctx->cancel_lock);
ctx->clockid = clockid;
if (isalarm(ctx))
@@ -421,16 +432,15 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
}
static int do_timerfd_settime(int ufd, int flags,
- const struct itimerspec *new,
- struct itimerspec *old)
+ const struct itimerspec64 *new,
+ struct itimerspec64 *old)
{
struct fd f;
struct timerfd_ctx *ctx;
int ret;
if ((flags & ~TFD_SETTIME_FLAGS) ||
- !timespec_valid(&new->it_value) ||
- !timespec_valid(&new->it_interval))
+ !itimerspec64_valid(new))
return -EINVAL;
ret = timerfd_fget(ufd, &f);
@@ -438,7 +448,7 @@ static int do_timerfd_settime(int ufd, int flags,
return ret;
ctx = f.file->private_data;
- if (!capable(CAP_WAKE_ALARM) && isalarm(ctx)) {
+ if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) {
fdput(f);
return -EPERM;
}
@@ -476,8 +486,8 @@ static int do_timerfd_settime(int ufd, int flags,
hrtimer_forward_now(&ctx->t.tmr, ctx->tintv);
}
- old->it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
- old->it_interval = ktime_to_timespec(ctx->tintv);
+ old->it_value = ktime_to_timespec64(timerfd_get_remaining(ctx));
+ old->it_interval = ktime_to_timespec64(ctx->tintv);
/*
* Re-program the timer to the new value ...
@@ -489,7 +499,7 @@ static int do_timerfd_settime(int ufd, int flags,
return ret;
}
-static int do_timerfd_gettime(int ufd, struct itimerspec *t)
+static int do_timerfd_gettime(int ufd, struct itimerspec64 *t)
{
struct fd f;
struct timerfd_ctx *ctx;
@@ -514,8 +524,8 @@ static int do_timerfd_gettime(int ufd, struct itimerspec *t)
hrtimer_restart(&ctx->t.tmr);
}
}
- t->it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
- t->it_interval = ktime_to_timespec(ctx->tintv);
+ t->it_value = ktime_to_timespec64(timerfd_get_remaining(ctx));
+ t->it_interval = ktime_to_timespec64(ctx->tintv);
spin_unlock_irq(&ctx->wqh.lock);
fdput(f);
return 0;
@@ -525,15 +535,15 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
const struct itimerspec __user *, utmr,
struct itimerspec __user *, otmr)
{
- struct itimerspec new, old;
+ struct itimerspec64 new, old;
int ret;
- if (copy_from_user(&new, utmr, sizeof(new)))
+ if (get_itimerspec64(&new, utmr))
return -EFAULT;
ret = do_timerfd_settime(ufd, flags, &new, &old);
if (ret)
return ret;
- if (otmr && copy_to_user(otmr, &old, sizeof(old)))
+ if (otmr && put_itimerspec64(&old, otmr))
return -EFAULT;
return ret;
@@ -541,11 +551,11 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr)
{
- struct itimerspec kotmr;
+ struct itimerspec64 kotmr;
int ret = do_timerfd_gettime(ufd, &kotmr);
if (ret)
return ret;
- return copy_to_user(otmr, &kotmr, sizeof(kotmr)) ? -EFAULT: 0;
+ return put_itimerspec64(&kotmr, otmr) ? -EFAULT : 0;
}
#ifdef CONFIG_COMPAT
@@ -553,15 +563,15 @@ COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
const struct compat_itimerspec __user *, utmr,
struct compat_itimerspec __user *, otmr)
{
- struct itimerspec new, old;
+ struct itimerspec64 new, old;
int ret;
- if (get_compat_itimerspec(&new, utmr))
+ if (get_compat_itimerspec64(&new, utmr))
return -EFAULT;
ret = do_timerfd_settime(ufd, flags, &new, &old);
if (ret)
return ret;
- if (otmr && put_compat_itimerspec(otmr, &old))
+ if (otmr && put_compat_itimerspec64(&old, otmr))
return -EFAULT;
return ret;
}
@@ -569,10 +579,10 @@ COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
COMPAT_SYSCALL_DEFINE2(timerfd_gettime, int, ufd,
struct compat_itimerspec __user *, otmr)
{
- struct itimerspec kotmr;
+ struct itimerspec64 kotmr;
int ret = do_timerfd_gettime(ufd, &kotmr);
if (ret)
return ret;
- return put_compat_itimerspec(otmr, &kotmr) ? -EFAULT: 0;
+ return put_compat_itimerspec64(&kotmr, otmr) ? -EFAULT : 0;
}
#endif
generated by cgit v1.2.3 (git 2.0.4) at 2024-09-21 21:28:04 +0000