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![Arnd Bergmann](/assets/img/avatar_default.png)
Christoph Hellwig suggested a slightly different path for handling backwards compatibility with the 32-bit time_t based system calls: Rather than simply reusing the compat_sys_* entry points on 32-bit architectures unchanged, we get rid of those entry points and the compat_time types by renaming them to something that makes more sense on 32-bit architectures (which don't have a compat mode otherwise), and then share the entry points under the new name with the 64-bit architectures that use them for implementing the compatibility. The following types and interfaces are renamed here, and moved from linux/compat_time.h to linux/time32.h: old new --- --- compat_time_t old_time32_t struct compat_timeval struct old_timeval32 struct compat_timespec struct old_timespec32 struct compat_itimerspec struct old_itimerspec32 ns_to_compat_timeval() ns_to_old_timeval32() get_compat_itimerspec64() get_old_itimerspec32() put_compat_itimerspec64() put_old_itimerspec32() compat_get_timespec64() get_old_timespec32() compat_put_timespec64() put_old_timespec32() As we already have aliases in place, this patch addresses only the instances that are relevant to the system call interface in particular, not those that occur in device drivers and other modules. Those will get handled separately, while providing the 64-bit version of the respective interfaces. I'm not renaming the timex, rusage and itimerval structures, as we are still debating what the new interface will look like, and whether we will need a replacement at all. This also doesn't change the names of the syscall entry points, which can be done more easily when we actually switch over the 32-bit architectures to use them, at that point we need to change COMPAT_SYSCALL_DEFINEx to SYSCALL_DEFINEx with a new name, e.g. with a _time32 suffix. Suggested-by: Christoph Hellwig <hch@infradead.org> Link: https://lore.kernel.org/lkml/20180705222110.GA5698@infradead.org/ Signed-off-by: Arnd Bergmann <arnd@arndb.de>
589 lines
13 KiB
C
589 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/timerfd.c
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*
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* Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
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*
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*
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* Thanks to Thomas Gleixner for code reviews and useful comments.
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*
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*/
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#include <linux/alarmtimer.h>
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#include <linux/file.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/time.h>
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#include <linux/hrtimer.h>
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#include <linux/anon_inodes.h>
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#include <linux/timerfd.h>
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#include <linux/syscalls.h>
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#include <linux/compat.h>
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#include <linux/rcupdate.h>
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struct timerfd_ctx {
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union {
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struct hrtimer tmr;
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struct alarm alarm;
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} t;
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ktime_t tintv;
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ktime_t moffs;
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wait_queue_head_t wqh;
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u64 ticks;
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int clockid;
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short unsigned expired;
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short unsigned settime_flags; /* to show in fdinfo */
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struct rcu_head rcu;
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struct list_head clist;
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spinlock_t cancel_lock;
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bool might_cancel;
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};
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static LIST_HEAD(cancel_list);
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static DEFINE_SPINLOCK(cancel_lock);
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static inline bool isalarm(struct timerfd_ctx *ctx)
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{
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return ctx->clockid == CLOCK_REALTIME_ALARM ||
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ctx->clockid == CLOCK_BOOTTIME_ALARM;
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}
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/*
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* This gets called when the timer event triggers. We set the "expired"
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* flag, but we do not re-arm the timer (in case it's necessary,
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* tintv != 0) until the timer is accessed.
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*/
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static void timerfd_triggered(struct timerfd_ctx *ctx)
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{
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unsigned long flags;
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spin_lock_irqsave(&ctx->wqh.lock, flags);
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ctx->expired = 1;
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ctx->ticks++;
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wake_up_locked_poll(&ctx->wqh, EPOLLIN);
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spin_unlock_irqrestore(&ctx->wqh.lock, flags);
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}
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static enum hrtimer_restart timerfd_tmrproc(struct hrtimer *htmr)
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{
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struct timerfd_ctx *ctx = container_of(htmr, struct timerfd_ctx,
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t.tmr);
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timerfd_triggered(ctx);
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return HRTIMER_NORESTART;
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}
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static enum alarmtimer_restart timerfd_alarmproc(struct alarm *alarm,
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ktime_t now)
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{
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struct timerfd_ctx *ctx = container_of(alarm, struct timerfd_ctx,
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t.alarm);
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timerfd_triggered(ctx);
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return ALARMTIMER_NORESTART;
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}
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/*
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* Called when the clock was set to cancel the timers in the cancel
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* list. This will wake up processes waiting on these timers. The
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* wake-up requires ctx->ticks to be non zero, therefore we increment
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* it before calling wake_up_locked().
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*/
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void timerfd_clock_was_set(void)
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{
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ktime_t moffs = ktime_mono_to_real(0);
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struct timerfd_ctx *ctx;
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unsigned long flags;
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rcu_read_lock();
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list_for_each_entry_rcu(ctx, &cancel_list, clist) {
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if (!ctx->might_cancel)
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continue;
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spin_lock_irqsave(&ctx->wqh.lock, flags);
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if (ctx->moffs != moffs) {
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ctx->moffs = KTIME_MAX;
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ctx->ticks++;
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wake_up_locked_poll(&ctx->wqh, EPOLLIN);
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}
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spin_unlock_irqrestore(&ctx->wqh.lock, flags);
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}
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rcu_read_unlock();
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}
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static void __timerfd_remove_cancel(struct timerfd_ctx *ctx)
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{
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if (ctx->might_cancel) {
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ctx->might_cancel = false;
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spin_lock(&cancel_lock);
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list_del_rcu(&ctx->clist);
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spin_unlock(&cancel_lock);
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}
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}
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static void timerfd_remove_cancel(struct timerfd_ctx *ctx)
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{
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spin_lock(&ctx->cancel_lock);
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__timerfd_remove_cancel(ctx);
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spin_unlock(&ctx->cancel_lock);
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}
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static bool timerfd_canceled(struct timerfd_ctx *ctx)
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{
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if (!ctx->might_cancel || ctx->moffs != KTIME_MAX)
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return false;
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ctx->moffs = ktime_mono_to_real(0);
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return true;
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}
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static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags)
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{
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spin_lock(&ctx->cancel_lock);
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if ((ctx->clockid == CLOCK_REALTIME ||
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ctx->clockid == CLOCK_REALTIME_ALARM) &&
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(flags & TFD_TIMER_ABSTIME) && (flags & TFD_TIMER_CANCEL_ON_SET)) {
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if (!ctx->might_cancel) {
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ctx->might_cancel = true;
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spin_lock(&cancel_lock);
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list_add_rcu(&ctx->clist, &cancel_list);
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spin_unlock(&cancel_lock);
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}
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} else {
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__timerfd_remove_cancel(ctx);
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}
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spin_unlock(&ctx->cancel_lock);
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}
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static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx)
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{
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ktime_t remaining;
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if (isalarm(ctx))
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remaining = alarm_expires_remaining(&ctx->t.alarm);
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else
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remaining = hrtimer_expires_remaining_adjusted(&ctx->t.tmr);
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return remaining < 0 ? 0: remaining;
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}
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static int timerfd_setup(struct timerfd_ctx *ctx, int flags,
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const struct itimerspec64 *ktmr)
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{
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enum hrtimer_mode htmode;
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ktime_t texp;
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int clockid = ctx->clockid;
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htmode = (flags & TFD_TIMER_ABSTIME) ?
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HRTIMER_MODE_ABS: HRTIMER_MODE_REL;
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texp = timespec64_to_ktime(ktmr->it_value);
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ctx->expired = 0;
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ctx->ticks = 0;
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ctx->tintv = timespec64_to_ktime(ktmr->it_interval);
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if (isalarm(ctx)) {
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alarm_init(&ctx->t.alarm,
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ctx->clockid == CLOCK_REALTIME_ALARM ?
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ALARM_REALTIME : ALARM_BOOTTIME,
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timerfd_alarmproc);
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} else {
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hrtimer_init(&ctx->t.tmr, clockid, htmode);
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hrtimer_set_expires(&ctx->t.tmr, texp);
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ctx->t.tmr.function = timerfd_tmrproc;
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}
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if (texp != 0) {
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if (isalarm(ctx)) {
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if (flags & TFD_TIMER_ABSTIME)
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alarm_start(&ctx->t.alarm, texp);
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else
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alarm_start_relative(&ctx->t.alarm, texp);
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} else {
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hrtimer_start(&ctx->t.tmr, texp, htmode);
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}
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if (timerfd_canceled(ctx))
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return -ECANCELED;
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}
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ctx->settime_flags = flags & TFD_SETTIME_FLAGS;
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return 0;
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}
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static int timerfd_release(struct inode *inode, struct file *file)
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{
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struct timerfd_ctx *ctx = file->private_data;
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timerfd_remove_cancel(ctx);
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if (isalarm(ctx))
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alarm_cancel(&ctx->t.alarm);
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else
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hrtimer_cancel(&ctx->t.tmr);
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kfree_rcu(ctx, rcu);
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return 0;
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}
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static __poll_t timerfd_poll(struct file *file, poll_table *wait)
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{
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struct timerfd_ctx *ctx = file->private_data;
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__poll_t events = 0;
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unsigned long flags;
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poll_wait(file, &ctx->wqh, wait);
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spin_lock_irqsave(&ctx->wqh.lock, flags);
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if (ctx->ticks)
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events |= EPOLLIN;
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spin_unlock_irqrestore(&ctx->wqh.lock, flags);
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return events;
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}
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static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct timerfd_ctx *ctx = file->private_data;
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ssize_t res;
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u64 ticks = 0;
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if (count < sizeof(ticks))
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return -EINVAL;
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spin_lock_irq(&ctx->wqh.lock);
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if (file->f_flags & O_NONBLOCK)
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res = -EAGAIN;
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else
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res = wait_event_interruptible_locked_irq(ctx->wqh, ctx->ticks);
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/*
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* If clock has changed, we do not care about the
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* ticks and we do not rearm the timer. Userspace must
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* reevaluate anyway.
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*/
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if (timerfd_canceled(ctx)) {
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ctx->ticks = 0;
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ctx->expired = 0;
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res = -ECANCELED;
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}
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if (ctx->ticks) {
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ticks = ctx->ticks;
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if (ctx->expired && ctx->tintv) {
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/*
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* If tintv != 0, this is a periodic timer that
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* needs to be re-armed. We avoid doing it in the timer
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* callback to avoid DoS attacks specifying a very
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* short timer period.
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*/
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if (isalarm(ctx)) {
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ticks += alarm_forward_now(
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&ctx->t.alarm, ctx->tintv) - 1;
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alarm_restart(&ctx->t.alarm);
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} else {
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ticks += hrtimer_forward_now(&ctx->t.tmr,
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ctx->tintv) - 1;
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hrtimer_restart(&ctx->t.tmr);
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}
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}
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ctx->expired = 0;
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ctx->ticks = 0;
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}
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spin_unlock_irq(&ctx->wqh.lock);
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if (ticks)
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res = put_user(ticks, (u64 __user *) buf) ? -EFAULT: sizeof(ticks);
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return res;
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}
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#ifdef CONFIG_PROC_FS
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static void timerfd_show(struct seq_file *m, struct file *file)
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{
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struct timerfd_ctx *ctx = file->private_data;
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struct itimerspec t;
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spin_lock_irq(&ctx->wqh.lock);
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t.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
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t.it_interval = ktime_to_timespec(ctx->tintv);
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spin_unlock_irq(&ctx->wqh.lock);
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seq_printf(m,
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"clockid: %d\n"
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"ticks: %llu\n"
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"settime flags: 0%o\n"
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"it_value: (%llu, %llu)\n"
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"it_interval: (%llu, %llu)\n",
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ctx->clockid,
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(unsigned long long)ctx->ticks,
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ctx->settime_flags,
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(unsigned long long)t.it_value.tv_sec,
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(unsigned long long)t.it_value.tv_nsec,
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(unsigned long long)t.it_interval.tv_sec,
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(unsigned long long)t.it_interval.tv_nsec);
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}
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#else
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#define timerfd_show NULL
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#endif
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#ifdef CONFIG_CHECKPOINT_RESTORE
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static long timerfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct timerfd_ctx *ctx = file->private_data;
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int ret = 0;
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switch (cmd) {
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case TFD_IOC_SET_TICKS: {
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u64 ticks;
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if (copy_from_user(&ticks, (u64 __user *)arg, sizeof(ticks)))
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return -EFAULT;
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if (!ticks)
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return -EINVAL;
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spin_lock_irq(&ctx->wqh.lock);
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if (!timerfd_canceled(ctx)) {
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ctx->ticks = ticks;
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wake_up_locked_poll(&ctx->wqh, EPOLLIN);
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} else
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ret = -ECANCELED;
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spin_unlock_irq(&ctx->wqh.lock);
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break;
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}
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default:
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ret = -ENOTTY;
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break;
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}
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return ret;
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}
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#else
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#define timerfd_ioctl NULL
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#endif
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static const struct file_operations timerfd_fops = {
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.release = timerfd_release,
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.poll = timerfd_poll,
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.read = timerfd_read,
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.llseek = noop_llseek,
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.show_fdinfo = timerfd_show,
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.unlocked_ioctl = timerfd_ioctl,
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};
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static int timerfd_fget(int fd, struct fd *p)
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{
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struct fd f = fdget(fd);
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if (!f.file)
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return -EBADF;
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if (f.file->f_op != &timerfd_fops) {
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fdput(f);
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return -EINVAL;
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}
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*p = f;
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return 0;
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}
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SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
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{
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int ufd;
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struct timerfd_ctx *ctx;
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/* Check the TFD_* constants for consistency. */
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BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC);
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BUILD_BUG_ON(TFD_NONBLOCK != O_NONBLOCK);
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if ((flags & ~TFD_CREATE_FLAGS) ||
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(clockid != CLOCK_MONOTONIC &&
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clockid != CLOCK_REALTIME &&
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clockid != CLOCK_REALTIME_ALARM &&
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clockid != CLOCK_BOOTTIME &&
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clockid != CLOCK_BOOTTIME_ALARM))
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return -EINVAL;
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if ((clockid == CLOCK_REALTIME_ALARM ||
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clockid == CLOCK_BOOTTIME_ALARM) &&
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!capable(CAP_WAKE_ALARM))
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return -EPERM;
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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init_waitqueue_head(&ctx->wqh);
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spin_lock_init(&ctx->cancel_lock);
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ctx->clockid = clockid;
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if (isalarm(ctx))
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alarm_init(&ctx->t.alarm,
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ctx->clockid == CLOCK_REALTIME_ALARM ?
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ALARM_REALTIME : ALARM_BOOTTIME,
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timerfd_alarmproc);
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else
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hrtimer_init(&ctx->t.tmr, clockid, HRTIMER_MODE_ABS);
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ctx->moffs = ktime_mono_to_real(0);
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ufd = anon_inode_getfd("[timerfd]", &timerfd_fops, ctx,
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O_RDWR | (flags & TFD_SHARED_FCNTL_FLAGS));
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if (ufd < 0)
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kfree(ctx);
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return ufd;
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}
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static int do_timerfd_settime(int ufd, int flags,
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const struct itimerspec64 *new,
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struct itimerspec64 *old)
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{
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struct fd f;
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struct timerfd_ctx *ctx;
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int ret;
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if ((flags & ~TFD_SETTIME_FLAGS) ||
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!itimerspec64_valid(new))
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return -EINVAL;
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ret = timerfd_fget(ufd, &f);
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if (ret)
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return ret;
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ctx = f.file->private_data;
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if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) {
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fdput(f);
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return -EPERM;
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}
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timerfd_setup_cancel(ctx, flags);
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/*
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* We need to stop the existing timer before reprogramming
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* it to the new values.
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*/
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for (;;) {
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spin_lock_irq(&ctx->wqh.lock);
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if (isalarm(ctx)) {
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if (alarm_try_to_cancel(&ctx->t.alarm) >= 0)
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break;
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} else {
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if (hrtimer_try_to_cancel(&ctx->t.tmr) >= 0)
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break;
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}
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spin_unlock_irq(&ctx->wqh.lock);
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cpu_relax();
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}
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/*
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* If the timer is expired and it's periodic, we need to advance it
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* because the caller may want to know the previous expiration time.
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* We do not update "ticks" and "expired" since the timer will be
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* re-programmed again in the following timerfd_setup() call.
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*/
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if (ctx->expired && ctx->tintv) {
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if (isalarm(ctx))
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alarm_forward_now(&ctx->t.alarm, ctx->tintv);
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|
else
|
|
hrtimer_forward_now(&ctx->t.tmr, 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 ...
|
|
*/
|
|
ret = timerfd_setup(ctx, flags, new);
|
|
|
|
spin_unlock_irq(&ctx->wqh.lock);
|
|
fdput(f);
|
|
return ret;
|
|
}
|
|
|
|
static int do_timerfd_gettime(int ufd, struct itimerspec64 *t)
|
|
{
|
|
struct fd f;
|
|
struct timerfd_ctx *ctx;
|
|
int ret = timerfd_fget(ufd, &f);
|
|
if (ret)
|
|
return ret;
|
|
ctx = f.file->private_data;
|
|
|
|
spin_lock_irq(&ctx->wqh.lock);
|
|
if (ctx->expired && ctx->tintv) {
|
|
ctx->expired = 0;
|
|
|
|
if (isalarm(ctx)) {
|
|
ctx->ticks +=
|
|
alarm_forward_now(
|
|
&ctx->t.alarm, ctx->tintv) - 1;
|
|
alarm_restart(&ctx->t.alarm);
|
|
} else {
|
|
ctx->ticks +=
|
|
hrtimer_forward_now(&ctx->t.tmr, ctx->tintv)
|
|
- 1;
|
|
hrtimer_restart(&ctx->t.tmr);
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
|
|
const struct __kernel_itimerspec __user *, utmr,
|
|
struct __kernel_itimerspec __user *, otmr)
|
|
{
|
|
struct itimerspec64 new, old;
|
|
int ret;
|
|
|
|
if (get_itimerspec64(&new, utmr))
|
|
return -EFAULT;
|
|
ret = do_timerfd_settime(ufd, flags, &new, &old);
|
|
if (ret)
|
|
return ret;
|
|
if (otmr && put_itimerspec64(&old, otmr))
|
|
return -EFAULT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct __kernel_itimerspec __user *, otmr)
|
|
{
|
|
struct itimerspec64 kotmr;
|
|
int ret = do_timerfd_gettime(ufd, &kotmr);
|
|
if (ret)
|
|
return ret;
|
|
return put_itimerspec64(&kotmr, otmr) ? -EFAULT : 0;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT_32BIT_TIME
|
|
COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
|
|
const struct old_itimerspec32 __user *, utmr,
|
|
struct old_itimerspec32 __user *, otmr)
|
|
{
|
|
struct itimerspec64 new, old;
|
|
int ret;
|
|
|
|
if (get_old_itimerspec32(&new, utmr))
|
|
return -EFAULT;
|
|
ret = do_timerfd_settime(ufd, flags, &new, &old);
|
|
if (ret)
|
|
return ret;
|
|
if (otmr && put_old_itimerspec32(&old, otmr))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(timerfd_gettime, int, ufd,
|
|
struct old_itimerspec32 __user *, otmr)
|
|
{
|
|
struct itimerspec64 kotmr;
|
|
int ret = do_timerfd_gettime(ufd, &kotmr);
|
|
if (ret)
|
|
return ret;
|
|
return put_old_itimerspec32(&kotmr, otmr) ? -EFAULT : 0;
|
|
}
|
|
#endif
|