Steven Rostedt (Google) ef38c79a52 tracing: Fix race where histograms can be called before the event ...

commit 94eedf3dde ("tracing: Fix race where eprobes can be called before
the event") fixed an issue where if an event is soft disabled, and the
trigger is being added, there's a small window where the event sees that
there's a trigger but does not see that it requires reading the event yet,
and then calls the trigger with the record == NULL.

This could be solved with adding memory barriers in the hot path, or to
make sure that all the triggers requiring a record check for NULL. The
latter was chosen.

Commit 94eedf3dde set the eprobe trigger handle to check for NULL, but
the same needs to be done with histograms.

Link: https://lore.kernel.org/linux-trace-kernel/20221118211809.701d40c0f8a757b0df3c025a@kernel.org/
Link: https://lore.kernel.org/linux-trace-kernel/20221123164323.03450c3a@gandalf.local.home

Cc: Tom Zanussi <zanussi@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 7491e2c442 ("tracing: Add a probe that attaches to trace events")
Reported-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

2022-11-23 19:05:50 -05:00

..

bpf

bpf: Initialize same number of free nodes for each pcpu_freelist

2022-11-11 12:05:14 -08:00

cgroup

Merge tag 'cgroup-for-6.1-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2022-10-17 18:52:43 -07:00

configs

Kbuild: add Rust support

2022-09-28 09:02:20 +02:00

debug

mm: remove vmacache

2022-09-26 19:46:18 -07:00

dma

Merge tag 'mm-stable-2022-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-10-10 17:53:04 -07:00

entry

entry: kmsan: introduce kmsan_unpoison_entry_regs()

2022-10-03 14:03:25 -07:00

events

perf: Improve missing SIGTRAP checking

2022-11-08 10:39:27 +01:00

futex

freezer,sched: Rewrite core freezer logic

2022-09-07 21:53:50 +02:00

gcov

gcov: support GCC 12.1 and newer compilers

2022-10-20 21:27:22 -07:00

irq

genirq: Provide generic_handle_domain_irq_safe().

2022-09-19 15:08:38 +02:00

kcsan

treewide: use get_random_bytes() when possible

2022-10-11 17:42:58 -06:00

livepatch

Merge tag 'livepatching-for-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

2022-10-10 11:36:19 -07:00

locking

treewide: use prandom_u32_max() when possible, part 1

2022-10-11 17:42:55 -06:00

module

module: tracking: Keep a record of tainted unloaded modules only

2022-10-10 12:16:19 -07:00

power

PM: hibernate: Allow hybrid sleep to work with s2idle

2022-10-25 14:53:19 +02:00

printk

printk: Mark __printk percpu data ready __ro_after_init

2022-09-29 15:20:52 +02:00

rcu

rcu: Keep synchronize_rcu() from enabling irqs in early boot

2022-10-20 15:34:49 -07:00

sched

sched: Fix race in task_call_func()

2022-11-14 09:58:32 +01:00

time

treewide: use prandom_u32_max() when possible, part 1

2022-10-11 17:42:55 -06:00

trace

tracing: Fix race where histograms can be called before the event

2022-11-23 19:05:50 -05:00

.gitignore

…

acct.c

acct: use VMA iterator instead of linked list

2022-09-26 19:46:22 -07:00

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

audit: fix potential double free on error path from fsnotify_add_inode_mark

2022-08-22 18:50:06 -04:00

audit_tree.c

audit: use fsnotify group lock helpers

2022-04-25 14:37:28 +02:00

audit_watch.c

audit_init_parent(): constify path

2022-09-01 17:39:30 -04:00

audit.c

audit: use time_after to compare time

2022-08-29 19:47:03 -04:00

audit.h

audit: remove selinux_audit_rule_update() declaration

2022-09-07 11:30:15 -04:00

auditfilter.c

…

auditsc.c

Merge tag 'audit-pr-20221003' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit

2022-10-04 11:05:43 -07:00

backtracetest.c

…

bounds.c

mm: multi-gen LRU: minimal implementation

2022-09-26 19:46:09 -07:00

capability.c

xfs: don't generate selinux audit messages for capability testing

2022-03-09 10:32:06 -08:00

cfi.c

cfi: Switch to -fsanitize=kcfi

2022-09-26 10:13:13 -07:00

compat.c

…

configs.c

…

context_tracking.c

MAINTAINERS: Add Paul as context tracking maintainer

2022-07-05 13:33:00 -07:00

cpu_pm.c

context_tracking: Take IRQ eqs entrypoints over RCU

2022-07-05 13:32:59 -07:00

cpu.c

Merge tag 'x86_tdx_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-05-23 17:51:12 -07:00

crash_core.c

vmcoreinfo: add kallsyms_num_syms symbol

2022-08-28 14:02:44 -07:00

crash_dump.c

…

cred.c

x86: Mark __invalid_creds() __noreturn

2022-03-15 10:32:44 +01:00

delayacct.c

delayacct: support re-entrance detection of thrashing accounting

2022-09-26 19:46:07 -07:00

dma.c

…

exec_domain.c

…

exit.c

Merge tag 'mm-nonmm-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-10-12 11:00:22 -07:00

extable.c

context_tracking: Take NMI eqs entrypoints over RCU

2022-07-05 13:32:59 -07:00

fail_function.c

fail_function: fix wrong use of fei_attr_remove()

2022-09-11 21:55:11 -07:00

fork.c

Merge tag 'mm-nonmm-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-10-12 11:00:22 -07:00

freezer.c

freezer,sched: Rewrite core freezer logic

2022-09-07 21:53:50 +02:00

gen_kheaders.sh

kbuild: build init/built-in.a just once

2022-09-29 04:40:15 +09:00

groups.c

security: Add LSM hook to setgroups() syscall

2022-07-15 18:21:49 +00:00

hung_task.c

sched: Fix more TASK_state comparisons

2022-09-30 16:50:39 +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: make initial NOP patching the special case

2022-06-24 09:48:55 +02:00

kallsyms_internal.h

kallsyms: move declarations to internal header

2022-07-17 17:31:39 -07:00

kallsyms.c

Merge tag 'kcfi-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

2022-10-03 17:11:07 -07:00

kcmp.c

…

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

…

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: kmsan: unpoison area->list in kcov_remote_area_put()

2022-10-03 14:03:23 -07:00

kexec_core.c

kexec: replace kmap() with kmap_local_page()

2022-09-11 21:55:08 -07:00

kexec_elf.c

…

kexec_file.c

panic, kexec: make __crash_kexec() NMI safe

2022-09-11 21:55:06 -07:00

kexec_internal.h

panic, kexec: make __crash_kexec() NMI safe

2022-09-11 21:55:06 -07:00

kexec.c

panic, kexec: make __crash_kexec() NMI safe

2022-09-11 21:55:06 -07:00

kheaders.c

…

kmod.c

…

kprobes.c

kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case

2022-11-18 10:15:34 +09:00

ksysfs.c

kexec: turn all kexec_mutex acquisitions into trylocks

2022-09-11 21:55:06 -07:00

kthread.c

Merge tag 'interrupting_kthread_stop-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-10-09 16:01:59 -07:00

latencytop.c

latencytop: use the last element of latency_record of system

2022-09-11 21:55:12 -07:00

Makefile

kmsan: disable instrumentation of unsupported common kernel code

2022-10-03 14:03:20 -07:00

module_signature.c

…

notifier.c

notifier: Add blocking/atomic_notifier_chain_register_unique_prio()

2022-05-19 19:30:30 +02:00

nsproxy.c

Revert "fs/exec: allow to unshare a time namespace on vfork+exec"

2022-09-13 10:38:43 -07:00

padata.c

padata: replace cpumask_weight with cpumask_empty in padata.c

2022-01-31 11:21:46 +11:00

panic.c

kernel/panic: Drop unblank_screen call

2022-09-01 16:55:35 +02:00

params.c

…

pid_namespace.c

kernel: pid_namespace: use NULL instead of using plain integer as pointer

2022-04-29 14:38:00 -07:00

pid.c

gfs2: Add glockfd debugfs file

2022-06-29 13:07:16 +02:00

profile.c

kernel/profile.c: simplify duplicated code in profile_setup()

2022-09-11 21:55:12 -07:00

ptrace.c

freezer,sched: Rewrite core freezer logic

2022-09-07 21:53:50 +02:00

range.c

…

reboot.c

kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode

2022-10-04 15:59:36 +02:00

regset.c

…

relay.c

relay: use kvcalloc to alloc page array in relay_alloc_page_array

2022-10-03 14:21:43 -07:00

resource_kunit.c

…

resource.c

resource: Introduce alloc_free_mem_region()

2022-07-21 17:19:25 -07:00

rseq.c

rseq: Use pr_warn_once() when deprecated/unknown ABI flags are encountered

2022-11-14 09:58:32 +01:00

scftorture.c

scftorture: Fix distribution of short handler delays

2022-04-11 17:07:29 -07:00

scs.c

kasan, vmalloc: only tag normal vmalloc allocations

2022-03-24 19:06:48 -07:00

seccomp.c

seccomp: Add wait_killable semantic to seccomp user notifier

2022-05-03 14:11:58 -07:00

signal.c

Merge tag 'sched-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-10-10 09:10:28 -07:00

smp.c

Merge tag 'bitmap-6.1-rc1' of https://github.com/norov/linux

2022-10-10 12:49:34 -07:00

smpboot.c

smpboot: use atomic_try_cmpxchg in cpu_wait_death and cpu_report_death

2022-09-11 21:55:10 -07:00

smpboot.h

…

softirq.c

context_tracking: Take IRQ eqs entrypoints over RCU

2022-07-05 13:32:59 -07:00

stackleak.c

stackleak: add on/off stack variants

2022-05-08 01:33:09 -07:00

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

Merge tag 'sched-core-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-05-24 11:11:13 -07:00

sys_ni.c

kernel/sys_ni: add compat entry for fadvise64_64

2022-08-20 15:17:45 -07:00

sys.c

Merge tag 'random-6.1-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random

2022-10-10 10:41:21 -07:00

sysctl-test.c

kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}

2022-09-08 16:56:45 -07:00

sysctl.c

Merge tag 'mm-stable-2022-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-10-10 17:53:04 -07:00

task_work.c

task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run

2022-09-11 21:55:10 -07:00

taskstats.c

genetlink: start to validate reserved header bytes

2022-08-29 12:47:15 +01:00

torture.c

torture: Wake up kthreads after storing task_struct pointer

2022-02-01 17:24:39 -08:00

tracepoint.c

tracepoint: Optimize the critical region of mutex_lock in tracepoint_module_coming()

2022-09-26 13:01:18 -04:00

tsacct.c

taskstats: version 12 with thread group and exe info

2022-04-29 14:38:03 -07:00

ucount.c

ucounts: Split rlimit and ucount values and max values

2022-05-18 18:24:57 -05:00

uid16.c

…

uid16.h

…

umh.c

freezer,sched: Rewrite core freezer logic

2022-09-07 21:53:50 +02:00

up.c

…

user_namespace.c

Merge tag 'ucount-rlimits-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-10-09 16:24:05 -07:00

user-return-notifier.c

…

user.c

…

usermode_driver.c

blob_to_mnt(): kern_unmount() is needed to undo kern_mount()

2022-05-19 23:25:47 -04:00

utsname_sysctl.c

kernel/utsname_sysctl.c: Fix hostname polling

2022-10-23 12:01:01 -07:00

utsname.c

…

watch_queue.c

Merge tag 'docs-6.0' of git://git.lwn.net/linux

2022-08-02 19:24:24 -07:00

watchdog_hld.c

Revert "printk: add functions to prefer direct printing"

2022-06-23 18:41:40 +02:00

watchdog.c

Merge tag 'powerpc-6.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2022-08-06 16:38:17 -07:00

workqueue_internal.h

…

workqueue.c

Merge tag 'kcfi-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

2022-10-03 17:11:07 -07:00