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Peter Zijlstra 3ac6487e58 perf: Fix sys_perf_event_open() race against self 
Norbert reported that it's possible to race sys_perf_event_open() such
that the looser ends up in another context from the group leader,
triggering many WARNs.

The move_group case checks for races against itself, but the
!move_group case doesn't, seemingly relying on the previous
group_leader->ctx == ctx check. However, that check is racy due to not
holding any locks at that time.

Therefore, re-check the result after acquiring locks and bailing
if they no longer match.

Additionally, clarify the not_move_group case from the
move_group-vs-move_group race.

Fixes: f63a8daa5812 ("perf: Fix event->ctx locking")
Reported-by: Norbert Slusarek <nslusarek@gmx.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-05-20 08:44:00 -10:00
..
bpf
bpf: Fix maximum permitted number of arguments check
2022-03-28 19:08:17 -07:00
cgroup
cgroup/cpuset: Remove cpus_allowed/mems_allowed setup in cpuset_init_smp()
2022-05-05 08:57:00 -10:00
configs
Char/Misc and other driver updates for 5.18-rc1
2022-03-28 12:27:35 -07:00
debug
kdb: Fix the putarea helper function
2022-03-24 16:39:47 +00:00
dma
dma-direct: avoid redundant memory sync for swiotlb
2022-04-14 06:30:39 +02:00
entry
entry: Fix compile error in dynamic_irqentry_exit_cond_resched()
2022-04-05 09:59:36 +02:00
events
perf: Fix sys_perf_event_open() race against self
2022-05-20 08:44:00 -10:00
futex
mm/truncate: Inline invalidate_complete_page() into its one caller
2022-03-21 12:59:01 -04:00
gcov
gcov: Remove compiler version check
2021-12-02 17:25:21 +09:00
irq
genirq: Remove WARN_ON_ONCE() in generic_handle_domain_irq()
2022-05-11 02:22:52 +02:00
kcsan
KCSAN updates for v5.17
2022-01-11 09:51:26 -08:00
livepatch
ptrace: Cleanups for v5.18
2022-03-28 17:29:53 -07:00
locking
Changes in this cycle were:
2022-03-22 13:44:21 -07:00
power
for-5.18/block-2022-03-18
2022-03-21 16:48:55 -07:00
printk
printk changes for 5.18
2022-03-23 10:54:27 -07:00
rcu
Changes in this cycle were:
2022-03-22 14:39:12 -07:00
sched
sched/tracing: Append prev_state to tp args instead
2022-05-12 00:37:11 +02:00
time
timekeeping: Mark NMI safe time accessors as notrace
2022-04-29 00:07:53 +02:00
trace
sched/tracing: Append prev_state to tp args instead
2022-05-12 00:37:11 +02:00
.gitignore
…
acct.c
kernel: remove spurious blkdev.h includes
2021-10-18 06:17:01 -06:00
async.c
Revert "module, async: async_synchronize_full() on module init iff async is used"
2022-02-03 11:20:34 -08:00
audit_fsnotify.c
fsnotify: clarify contract for create event hooks
2021-10-27 12:32:34 +02:00
audit_tree.c
audit: use struct_size() helper in kmalloc()
2021-12-14 17:39:42 -05:00
audit_watch.c
\n
2021-11-06 16:43:20 -07:00
audit.c
audit: improve audit queue handling when "audit=1" on cmdline
2022-01-25 13:22:51 -05:00
audit.h
audit: log AUDIT_TIME_* records only from rules
2022-02-22 13:51:40 -05:00
auditfilter.c
audit/stable-5.17 PR 20220110
2022-01-11 13:08:21 -08:00
auditsc.c
audit,io_uring,io-wq: call __audit_uring_exit for dummy contexts
2022-05-17 15:03:36 -04:00
backtracetest.c
…
bounds.c
…
capability.c
xfs: don't generate selinux audit messages for capability testing
2022-03-09 10:32:06 -08:00
cfi.c
cfi: Use rcu_read_{un}lock_sched_notrace
2021-08-11 13:11:12 -07:00
compat.c
arch: remove compat_alloc_user_space
2021-09-08 15:32:35 -07:00
configs.c
…
context_tracking.c
…
cpu_pm.c
PM: cpu: Make notifier chain use a raw_spinlock_t
2021-08-16 18:55:32 +02:00
cpu.c
cpu/hotplug: Remove the 'cpu' member of cpuhp_cpu_state
2022-04-13 21:25:40 +02:00
crash_core.c
kernel/crash_core: suppress unknown crashkernel parameter warning
2021-12-25 12:20:55 -08:00
crash_dump.c
…
cred.c
x86: Mark __invalid_creds() __noreturn
2022-03-15 10:32:44 +01:00
delayacct.c
delayacct: track delays from memory compact
2022-01-20 08:52:55 +02:00
dma.c
…
exec_domain.c
…
exit.c
ptrace: Cleanups for v5.18
2022-03-28 17:29:53 -07:00
extable.c
lkdtm: Really write into kernel text in WRITE_KERN
2022-02-16 23:25:12 +11:00
fail_function.c
…
fork.c
mm: Fix PASID use-after-free issue
2022-05-01 10:17:17 +02:00
freezer.c
sched: Add get_current_state()
2021-06-18 11:43:08 +02:00
gen_kheaders.sh
…
groups.c
…
hung_task.c
hung_task: move hung_task sysctl interface to hung_task.c
2022-01-22 08:33:34 +02:00
iomem.c
…
irq_work.c
irq_work: use kasan_record_aux_stack_noalloc() record callstack
2022-04-15 14:49:55 -07:00
jump_label.c
jump_label: Fix jump_label_text_reserved() vs __init
2021-07-05 10:46:20 +02:00
kallsyms.c
kallsyms: Skip the name search for empty string
2022-03-17 20:17:18 -07:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/rwlock: Provide RT variant
2021-08-17 17:50:51 +02:00
Kconfig.preempt
Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"
2022-03-31 10:36:55 +02:00
kcov.c
kcov: don't generate a warning on vm_insert_page()'s failure
2022-04-21 20:01:10 -07:00
kexec_core.c
exit: Move oops specific logic from do_exit into make_task_dead
2021-12-13 12:04:45 -06:00
kexec_elf.c
…
kexec_file.c
memblock: add MEMBLOCK_DRIVER_MANAGED to mimic IORESOURCE_SYSRAM_DRIVER_MANAGED
2021-11-06 13:30:42 -07:00
kexec_internal.h
…
kexec.c
kexec: avoid compat_alloc_user_space
2021-09-08 15:32:34 -07:00
kheaders.c
…
kmod.c
…
kprobes.c
kprobes: Fix KRETPROBES when CONFIG_KRETPROBE_ON_RETHOOK is set
2022-04-26 16:09:36 +02:00
ksysfs.c
kernel/ksysfs.c: use helper macro __ATTR_RW
2022-03-23 19:00:33 -07:00
kthread.c
asm-generic updates for 5.18
2022-03-23 18:03:08 -07:00
latencytop.c
…
Makefile
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
module_decompress.c
module: fix building with sysfs disabled
2022-02-16 12:51:32 -08:00
module_signature.c
…
module_signing.c
…
module-internal.h
module: add in-kernel support for decompressing
2022-01-11 18:45:02 -08:00
module.c
NFSD: Remove svc_serv_ops::svo_module
2022-02-28 10:26:40 -05:00
notifier.c
notifier: Return an error when a callback has already been registered
2021-12-29 10:37:33 +01:00
nsproxy.c
memcg: enable accounting for new namesapces and struct nsproxy
2021-09-03 09:58:12 -07:00
padata.c
padata: replace cpumask_weight with cpumask_empty in padata.c
2022-01-31 11:21:46 +11:00
panic.c
panic: move panic_print before kmsg dumpers
2022-03-23 19:00:35 -07:00
params.c
kobject: remove kset from struct kset_uevent_ops callbacks
2021-12-28 11:26:18 +01:00
pid_namespace.c
memcg: enable accounting for new namesapces and struct nsproxy
2021-09-03 09:58:12 -07:00
pid.c
pid: add pidfd_get_task() helper
2021-10-14 13:29:18 +02:00
profile.c
exit: Remove profile_handoff_task
2022-01-08 12:43:57 -06:00
ptrace.c
ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE
2022-03-22 13:06:05 -05:00
range.c
…
reboot.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2021-11-12 11:53:16 -08:00
regset.c
…
relay.c
…
resource_kunit.c
…
resource.c
kernel/resource: fix kfree() of bootmem memory again
2022-03-23 19:00:35 -07:00
rseq.c
rseq: Remove broken uapi field layout on 32-bit little endian
2022-02-02 13:11:34 +01:00
scftorture.c
scftorture: Always log error message
2021-12-07 16:36:17 -08:00
scs.c
kasan, vmalloc: only tag normal vmalloc allocations
2022-03-24 19:06:48 -07:00
seccomp.c
ptrace: Cleanups for v5.18
2022-03-28 17:29:53 -07:00
signal.c
Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"
2022-03-31 10:36:55 +02:00
smp.c
smp: Fix offline cpu check in flush_smp_call_function_queue()
2022-04-13 18:44:35 +02:00
smpboot.c
smpboot: Replace deprecated CPU-hotplug functions.
2021-08-10 14:57:42 +02:00
smpboot.h
…
softirq.c
genirq, softirq: Use in_hardirq() instead of in_irq()
2022-02-02 21:34:19 +01:00
stackleak.c
gcc-plugins/stackleak: Use noinstr in favor of notrace
2022-02-03 17:02:21 -08:00
stacktrace.c
uaccess: remove CONFIG_SET_FS
2022-02-25 09:36:06 +01:00
static_call_inline.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
static_call.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
stop_machine.c
…
sys_ni.c
mm/mempolicy: wire up syscall set_mempolicy_home_node
2022-01-15 16:30:30 +02:00
sys.c
prlimit: do not grab the tasklist_lock
2022-03-08 14:33:36 -06:00
sysctl-test.c
kernel/sysctl-test: Remove some casts which are no-longer required
2021-06-23 16:41:24 -06:00
sysctl.c
Merge branch 'akpm' (patches from Andrew)
2022-03-22 16:11:53 -07:00
task_work.c
resume_user_mode: Move to resume_user_mode.h
2022-03-10 16:51:50 -06:00
taskstats.c
taskstats: remove unneeded dead assignment
2022-03-23 19:00:35 -07:00
torture.c
torture: Wake up kthreads after storing task_struct pointer
2022-02-01 17:24:39 -08:00
tracepoint.c
tracepoint: Fix kerneldoc comments
2021-08-16 11:39:51 -04:00
tsacct.c
taskstats: Cleanup the use of task->exit_code
2022-01-08 12:43:57 -06:00
ucount.c
ucounts: Handle wrapping in is_ucounts_overlimit
2022-02-17 09:11:57 -06:00
uid16.c
…
uid16.h
…
umh.c
…
up.c
…
user_namespace.c
ucounts: Fix systemd LimitNPROC with private users regression
2022-02-25 10:40:14 -06:00
user-return-notifier.c
…
user.c
fs/epoll: use a per-cpu counter for user's watches count
2021-09-08 11:50:27 -07:00
usermode_driver.c
Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2021-07-03 11:41:14 -07:00
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
watch_queue: Free the page array when watch_queue is dismantled
2022-04-02 10:37:39 -07:00
watchdog_hld.c
…
watchdog.c
sched/isolation: Use single feature type while referring to housekeeping cpumask
2022-02-16 15:57:55 +01:00
workqueue_internal.h
workqueue: Assign a color to barrier work items
2021-08-17 07:49:10 -10:00
workqueue.c
Merge branch 'for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2022-03-23 12:40:51 -07:00