^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * fs/timerfd.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Thanks to Thomas Gleixner for code reviews and useful comments.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/alarmtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/hrtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/anon_inodes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/timerfd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/time_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <trace/hooks/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct timerfd_ctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct hrtimer tmr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct alarm alarm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) } t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ktime_t tintv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) ktime_t moffs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) wait_queue_head_t wqh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) u64 ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int clockid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) short unsigned expired;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) short unsigned settime_flags; /* to show in fdinfo */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct list_head clist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) spinlock_t cancel_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) bool might_cancel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static LIST_HEAD(cancel_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static DEFINE_SPINLOCK(cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static inline bool isalarm(struct timerfd_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return ctx->clockid == CLOCK_REALTIME_ALARM ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ctx->clockid == CLOCK_BOOTTIME_ALARM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * This gets called when the timer event triggers. We set the "expired"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * flag, but we do not re-arm the timer (in case it's necessary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * tintv != 0) until the timer is accessed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static void timerfd_triggered(struct timerfd_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) spin_lock_irqsave(&ctx->wqh.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ctx->expired = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) ctx->ticks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) wake_up_locked_poll(&ctx->wqh, EPOLLIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) spin_unlock_irqrestore(&ctx->wqh.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static enum hrtimer_restart timerfd_tmrproc(struct hrtimer *htmr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct timerfd_ctx *ctx = container_of(htmr, struct timerfd_ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) t.tmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) timerfd_triggered(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return HRTIMER_NORESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static enum alarmtimer_restart timerfd_alarmproc(struct alarm *alarm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) ktime_t now)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct timerfd_ctx *ctx = container_of(alarm, struct timerfd_ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) t.alarm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) timerfd_triggered(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return ALARMTIMER_NORESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Called when the clock was set to cancel the timers in the cancel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * list. This will wake up processes waiting on these timers. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * wake-up requires ctx->ticks to be non zero, therefore we increment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * it before calling wake_up_locked().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) void timerfd_clock_was_set(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ktime_t moffs = ktime_mono_to_real(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct timerfd_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) list_for_each_entry_rcu(ctx, &cancel_list, clist) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (!ctx->might_cancel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) spin_lock_irqsave(&ctx->wqh.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (ctx->moffs != moffs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) ctx->moffs = KTIME_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ctx->ticks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) wake_up_locked_poll(&ctx->wqh, EPOLLIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) spin_unlock_irqrestore(&ctx->wqh.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static void __timerfd_remove_cancel(struct timerfd_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (ctx->might_cancel) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ctx->might_cancel = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) spin_lock(&cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) list_del_rcu(&ctx->clist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) spin_unlock(&cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static void timerfd_remove_cancel(struct timerfd_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) spin_lock(&ctx->cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) __timerfd_remove_cancel(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) spin_unlock(&ctx->cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static bool timerfd_canceled(struct timerfd_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (!ctx->might_cancel || ctx->moffs != KTIME_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ctx->moffs = ktime_mono_to_real(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) spin_lock(&ctx->cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if ((ctx->clockid == CLOCK_REALTIME ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) ctx->clockid == CLOCK_REALTIME_ALARM) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) (flags & TFD_TIMER_ABSTIME) && (flags & TFD_TIMER_CANCEL_ON_SET)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!ctx->might_cancel) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) ctx->might_cancel = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) spin_lock(&cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) list_add_rcu(&ctx->clist, &cancel_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) spin_unlock(&cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) __timerfd_remove_cancel(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) spin_unlock(&ctx->cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ktime_t remaining;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (isalarm(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) remaining = alarm_expires_remaining(&ctx->t.alarm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) remaining = hrtimer_expires_remaining_adjusted(&ctx->t.tmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return remaining < 0 ? 0: remaining;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static int timerfd_setup(struct timerfd_ctx *ctx, int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) const struct itimerspec64 *ktmr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) enum hrtimer_mode htmode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) ktime_t texp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int clockid = ctx->clockid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) htmode = (flags & TFD_TIMER_ABSTIME) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) HRTIMER_MODE_ABS: HRTIMER_MODE_REL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) texp = timespec64_to_ktime(ktmr->it_value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) ctx->expired = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) ctx->ticks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) ctx->tintv = timespec64_to_ktime(ktmr->it_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (isalarm(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) alarm_init(&ctx->t.alarm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) ctx->clockid == CLOCK_REALTIME_ALARM ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) ALARM_REALTIME : ALARM_BOOTTIME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) timerfd_alarmproc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) hrtimer_init(&ctx->t.tmr, clockid, htmode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) hrtimer_set_expires(&ctx->t.tmr, texp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) ctx->t.tmr.function = timerfd_tmrproc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (texp != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (flags & TFD_TIMER_ABSTIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) texp = timens_ktime_to_host(clockid, texp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (isalarm(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (flags & TFD_TIMER_ABSTIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) alarm_start(&ctx->t.alarm, texp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) alarm_start_relative(&ctx->t.alarm, texp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) hrtimer_start(&ctx->t.tmr, texp, htmode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (timerfd_canceled(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return -ECANCELED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) ctx->settime_flags = flags & TFD_SETTIME_FLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static int timerfd_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct timerfd_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) timerfd_remove_cancel(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (isalarm(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) alarm_cancel(&ctx->t.alarm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) hrtimer_cancel(&ctx->t.tmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) kfree_rcu(ctx, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static __poll_t timerfd_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct timerfd_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) __poll_t events = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) poll_wait(file, &ctx->wqh, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) spin_lock_irqsave(&ctx->wqh.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (ctx->ticks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) events |= EPOLLIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) spin_unlock_irqrestore(&ctx->wqh.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return events;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct timerfd_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) ssize_t res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) u64 ticks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (count < sizeof(ticks))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) spin_lock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (file->f_flags & O_NONBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) res = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) res = wait_event_interruptible_locked_irq(ctx->wqh, ctx->ticks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) * If clock has changed, we do not care about the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * ticks and we do not rearm the timer. Userspace must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) * reevaluate anyway.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (timerfd_canceled(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) ctx->ticks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) ctx->expired = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) res = -ECANCELED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (ctx->ticks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) ticks = ctx->ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (ctx->expired && ctx->tintv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * If tintv != 0, this is a periodic timer that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * needs to be re-armed. We avoid doing it in the timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * callback to avoid DoS attacks specifying a very
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * short timer period.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (isalarm(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) ticks += alarm_forward_now(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) &ctx->t.alarm, ctx->tintv) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) alarm_restart(&ctx->t.alarm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) ticks += hrtimer_forward_now(&ctx->t.tmr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) ctx->tintv) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) hrtimer_restart(&ctx->t.tmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) ctx->expired = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) ctx->ticks = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) spin_unlock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (ticks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) res = put_user(ticks, (u64 __user *) buf) ? -EFAULT: sizeof(ticks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) #ifdef CONFIG_PROC_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static void timerfd_show(struct seq_file *m, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct timerfd_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) struct timespec64 value, interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) spin_lock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) value = ktime_to_timespec64(timerfd_get_remaining(ctx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) interval = ktime_to_timespec64(ctx->tintv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) spin_unlock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) seq_printf(m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) "clockid: %d\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) "ticks: %llu\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) "settime flags: 0%o\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) "it_value: (%llu, %llu)\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) "it_interval: (%llu, %llu)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) ctx->clockid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) (unsigned long long)ctx->ticks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) ctx->settime_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) (unsigned long long)value.tv_sec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) (unsigned long long)value.tv_nsec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) (unsigned long long)interval.tv_sec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) (unsigned long long)interval.tv_nsec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) #define timerfd_show NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) #ifdef CONFIG_CHECKPOINT_RESTORE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) static long timerfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct timerfd_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) case TFD_IOC_SET_TICKS: {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) u64 ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (copy_from_user(&ticks, (u64 __user *)arg, sizeof(ticks)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (!ticks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) spin_lock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (!timerfd_canceled(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) ctx->ticks = ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) wake_up_locked_poll(&ctx->wqh, EPOLLIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) ret = -ECANCELED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) spin_unlock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) ret = -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) #define timerfd_ioctl NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static const struct file_operations timerfd_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) .release = timerfd_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) .poll = timerfd_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) .read = timerfd_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) .llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) .show_fdinfo = timerfd_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) .unlocked_ioctl = timerfd_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static int timerfd_fget(int fd, struct fd *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct fd f = fdget(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if (!f.file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (f.file->f_op != &timerfd_fops) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) *p = f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) int ufd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) struct timerfd_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) char file_name_buf[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /* Check the TFD_* constants for consistency. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) BUILD_BUG_ON(TFD_NONBLOCK != O_NONBLOCK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if ((flags & ~TFD_CREATE_FLAGS) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) (clockid != CLOCK_MONOTONIC &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) clockid != CLOCK_REALTIME &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) clockid != CLOCK_REALTIME_ALARM &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) clockid != CLOCK_BOOTTIME &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) clockid != CLOCK_BOOTTIME_ALARM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if ((clockid == CLOCK_REALTIME_ALARM ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) clockid == CLOCK_BOOTTIME_ALARM) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) !capable(CAP_WAKE_ALARM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (!ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) init_waitqueue_head(&ctx->wqh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) spin_lock_init(&ctx->cancel_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) ctx->clockid = clockid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (isalarm(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) alarm_init(&ctx->t.alarm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) ctx->clockid == CLOCK_REALTIME_ALARM ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) ALARM_REALTIME : ALARM_BOOTTIME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) timerfd_alarmproc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) hrtimer_init(&ctx->t.tmr, clockid, HRTIMER_MODE_ABS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) ctx->moffs = ktime_mono_to_real(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) strlcpy(file_name_buf, "[timerfd]", sizeof(file_name_buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) trace_android_vh_timerfd_create(file_name_buf, sizeof(file_name_buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) ufd = anon_inode_getfd(file_name_buf, &timerfd_fops, ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) O_RDWR | (flags & TFD_SHARED_FCNTL_FLAGS));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (ufd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) kfree(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return ufd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) static int do_timerfd_settime(int ufd, int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) const struct itimerspec64 *new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) struct itimerspec64 *old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct fd f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct timerfd_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if ((flags & ~TFD_SETTIME_FLAGS) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) !itimerspec64_valid(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) ret = timerfd_fget(ufd, &f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) ctx = f.file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) timerfd_setup_cancel(ctx, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * We need to stop the existing timer before reprogramming
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * it to the new values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) spin_lock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (isalarm(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) if (alarm_try_to_cancel(&ctx->t.alarm) >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if (hrtimer_try_to_cancel(&ctx->t.tmr) >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) spin_unlock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (isalarm(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) hrtimer_cancel_wait_running(&ctx->t.alarm.timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) hrtimer_cancel_wait_running(&ctx->t.tmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) * If the timer is expired and it's periodic, we need to advance it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * because the caller may want to know the previous expiration time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * We do not update "ticks" and "expired" since the timer will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * re-programmed again in the following timerfd_setup() call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (ctx->expired && ctx->tintv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (isalarm(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) alarm_forward_now(&ctx->t.alarm, ctx->tintv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) hrtimer_forward_now(&ctx->t.tmr, ctx->tintv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) old->it_value = ktime_to_timespec64(timerfd_get_remaining(ctx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) old->it_interval = ktime_to_timespec64(ctx->tintv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) * Re-program the timer to the new value ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) ret = timerfd_setup(ctx, flags, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) spin_unlock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) static int do_timerfd_gettime(int ufd, struct itimerspec64 *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) struct fd f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) struct timerfd_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) int ret = timerfd_fget(ufd, &f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) ctx = f.file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) spin_lock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (ctx->expired && ctx->tintv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) ctx->expired = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) if (isalarm(ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) ctx->ticks +=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) alarm_forward_now(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) &ctx->t.alarm, ctx->tintv) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) alarm_restart(&ctx->t.alarm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) ctx->ticks +=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) hrtimer_forward_now(&ctx->t.tmr, ctx->tintv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) hrtimer_restart(&ctx->t.tmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) t->it_value = ktime_to_timespec64(timerfd_get_remaining(ctx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) t->it_interval = ktime_to_timespec64(ctx->tintv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) spin_unlock_irq(&ctx->wqh.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) const struct __kernel_itimerspec __user *, utmr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) struct __kernel_itimerspec __user *, otmr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) struct itimerspec64 new, old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (get_itimerspec64(&new, utmr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) ret = do_timerfd_settime(ufd, flags, &new, &old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (otmr && put_itimerspec64(&old, otmr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct __kernel_itimerspec __user *, otmr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) struct itimerspec64 kotmr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) int ret = do_timerfd_gettime(ufd, &kotmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) return put_itimerspec64(&kotmr, otmr) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) #ifdef CONFIG_COMPAT_32BIT_TIME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) SYSCALL_DEFINE4(timerfd_settime32, int, ufd, int, flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) const struct old_itimerspec32 __user *, utmr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) struct old_itimerspec32 __user *, otmr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) struct itimerspec64 new, old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (get_old_itimerspec32(&new, utmr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) ret = do_timerfd_settime(ufd, flags, &new, &old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (otmr && put_old_itimerspec32(&old, otmr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) SYSCALL_DEFINE2(timerfd_gettime32, int, ufd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) struct old_itimerspec32 __user *, otmr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) struct itimerspec64 kotmr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) int ret = do_timerfd_gettime(ufd, &kotmr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) return put_old_itimerspec32(&kotmr, otmr) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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