Oleg Nesterov f90fff1e15 posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() ... If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent or debugger right after unlock_task_sighand(). If a concurrent posix_cpu_timer_del() runs at that moment, it won't be able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or lock_task_sighand() will fail. Add the tsk->exit_state check into run_posix_cpu_timers() to fix this. This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because exit_task_work() is called before exit_notify(). But the check still makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail anyway in this case. Cc: stable@vger.kernel.org Reported-by: Benoît Sevens <bsevens@google.com> Fixes: 0bdd2ed413 ("sched: run_posix_cpu_timers: Don't check ->exit_state, use lock_task_sighand()") Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2025-06-13 10:55:49 -07:00
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alarmtimer.c	alarmtimer: Switch spin_{lock,unlock}_irqsave() to guards	2025-04-30 09:06:23 +02:00
clockevents.c	clockevents: Shutdown and unregister current clockevents at CPUHP_AP_TICK_DYING	2024-10-31 10:41:42 +01:00
clocksource-wdtest.c	clocksource/wdtest: Print time values for short udelay(1)	2025-01-15 19:49:13 +01:00
clocksource.c	clocksource: Fix the CPUs' choice in the watchdog per CPU verification	2025-05-13 15:38:55 +02:00
hrtimer.c	hrtimer: Add missing ACCESS_PRIVATE() for hrtimer::function	2025-04-09 21:00:42 +02:00
itimer.c	signal: Confine POSIX_TIMERS properly	2024-10-29 11:43:18 +01:00
jiffies.c	time/jiffies: Change register_refined_jiffies() to void __init	2025-04-30 09:06:23 +02:00
Kconfig	timekeeping: Always check for negative motion	2024-11-02 10:14:31 +01:00
Makefile	tracing: Disable branch profiling in noinstr code	2025-03-22 09:49:26 +01:00
namespace.c	vdso: Rework struct vdso_time_data and introduce struct vdso_clock	2025-03-08 14:37:41 +01:00
ntp_internal.h	ntp: Make sure RTC is synchronized when time goes backwards	2024-09-10 13:50:40 +02:00
ntp.c	time: Switch to hrtimer_setup()	2025-02-18 10:32:33 +01:00
posix-clock.c	Networking changes for 6.15.	2025-03-26 21:48:21 -07:00
posix-cpu-timers.c	posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()	2025-06-13 10:55:49 -07:00
posix-stubs.c	posix-timers: Get rid of [COMPAT_]SYS_NI() uses	2023-12-20 21:30:27 -08:00
posix-timers.c	posix-timers: Initialize cache early and move pointer into __timer_data	2025-04-09 21:21:36 +02:00
posix-timers.h	posix-timers: Cleanup SIG_IGN workaround leftovers	2024-11-07 02:14:45 +01:00
sched_clock.c	time: Switch to hrtimer_setup()	2025-02-18 10:32:33 +01:00
sleep_timeout.c	treewide, timers: Rename from_timer() to timer_container_of()	2025-06-08 09:07:37 +02:00
test_udelay.c	time: Add MODULE_DESCRIPTION() to time test modules	2024-06-03 11:18:50 +02:00
tick-broadcast-hrtimer.c	time: Switch to hrtimer_setup()	2025-02-18 10:32:33 +01:00
tick-broadcast.c	tick/broadcast: Add kernel-doc for function parameters	2025-01-15 19:49:14 +01:00
tick-common.c	timekeeping: Add a lockdep override in tick_freeze()	2025-04-09 22:30:39 +02:00
tick-internal.h	clockevents: Shutdown and unregister current clockevents at CPUHP_AP_TICK_DYING	2024-10-31 10:41:42 +01:00
tick-legacy.c	timekeeping: remove xtime_update	2020-10-30 21:57:07 +01:00
tick-oneshot.c	time: Fix various kernel-doc problems	2023-01-03 11:07:58 +01:00
tick-sched.c	time: Switch to hrtimer_setup()	2025-02-18 10:32:33 +01:00
tick-sched.h	tick/sched: Fix struct tick_sched doc warnings	2024-04-01 10:36:35 +02:00
time_test.c	time: Add MODULE_DESCRIPTION() to time test modules	2024-06-03 11:18:50 +02:00
time.c	time: Fix references to _msecs_to_jiffies() handling of values	2024-10-25 19:50:10 +02:00
timeconst.bc	time: Add SPDX license identifiers	2018-11-23 11:51:20 +01:00
timeconv.c	time: Improve performance of time64_to_tm()	2021-06-24 11:51:59 +02:00
timecounter.c	time/timecounter: Mark 1st argument of timecounter_cyc2time() as const	2021-04-16 21:03:50 +02:00
timekeeping_debug.c	timekeeping: Add percpu counter for tracking floor swap events	2024-10-10 10:20:46 +02:00
timekeeping_internal.h	clocksource: Make negative motion detection more robust	2024-12-05 16:03:24 +01:00
timekeeping.c	timekeeping: Prevent coarse clocks going backwards	2025-04-28 11:17:29 +02:00
timekeeping.h	asm-generic: cross-architecture timer cleanup	2020-12-16 00:07:17 -08:00
timer_list.c	hrtimers: Make callback function pointer private	2025-04-05 10:30:17 +02:00
timer_migration.c	timers/migration: Fix off-by-one root mis-connection	2025-02-07 09:02:16 +01:00
timer_migration.h	timer/migration: Fix kernel-doc warnings for union tmigr_state	2025-01-15 19:49:14 +01:00
timer.c	Updates for the time/timer core code:	2025-05-27 09:04:15 -07:00
vsyscall.c	timekeeping: Prevent coarse clocks going backwards	2025-04-28 11:17:29 +02:00