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Steven Rostedt (VMware) a3be1282ce tracing: Fix very unlikely race of registering two stat tracers 
[ Upstream commit dfb6cd1e654315168e36d947471bd2a0ccd834ae ]

Looking through old emails in my INBOX, I came across a patch from Luis
Henriques that attempted to fix a race of two stat tracers registering the
same stat trace (extremely unlikely, as this is done in the kernel, and
probably doesn't even exist). The submitted patch wasn't quite right as it
needed to deal with clean up a bit better (if two stat tracers were the
same, it would have the same files).

But to make the code cleaner, all we needed to do is to keep the
all_stat_sessions_mutex held for most of the registering function.

Link: http://lkml.kernel.org/r/1410299375-20068-1-git-send-email-luis.henriques@canonical.com

Fixes: 002bb86d8d42f ("tracing/ftrace: separate events tracing and stats tracing engine")
Reported-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-02-28 15:38:55 +01:00
..
bpf
bpf: silence warning messages in core
2019-08-04 09:34:46 +02:00
configs
kconfig: tinyconfig: provide whole choice blocks to avoid warnings
2016-09-24 10:07:42 +02:00
debug
kdb: do a sanity check on the cpu in kdb_per_cpu()
2020-01-29 10:21:43 +01:00
events
perf/core: Fix mlock accounting in perf_mmap()
2020-02-14 16:30:01 -05:00
gcov
gcov: disable for COMPILE_TEST
2018-01-23 19:50:10 +01:00
irq
genirq: Prevent NULL pointer dereference in resend_irqs()
2019-09-21 07:12:43 +02:00
livepatch
livepatch: x86: fix relocation computation with kASLR
2015-11-11 17:36:04 +01:00
locking
locking/spinlock/debug: Fix various data races
2020-01-12 11:22:46 +01:00
power
PM / Hibernate: Call flush_icache_range() on pages restored in-place
2019-04-03 06:23:24 +02:00
printk
printk: fix integer overflow in setup_log_buf()
2019-11-28 18:25:34 +01:00
rcu
rcutorture: Fix cleanup path for invalid torture_type strings
2019-06-11 12:24:04 +02:00
sched
sched/core: Allow putting thread_info into task_struct
2019-12-21 10:35:04 +01:00
time
clocksource: Prevent double add_timer_on() for watchdog_timer
2020-02-14 16:30:01 -05:00
trace
tracing: Fix very unlikely race of registering two stat tracers
2020-02-28 15:38:55 +01:00
.gitignore
certs: add .gitignore to stop git nagging about x509_certificate_list
2015-10-21 15:18:35 +01:00
acct.c
kernel/acct.c: fix the acct->needcheck check in check_free_space()
2018-01-10 09:27:08 +01:00
async.c
kernel/async.c: revert "async: simplify lowest_in_progress()"
2018-02-16 20:09:45 +01:00
audit_fsnotify.c
audit: clean simple fsnotify implementation
2015-08-06 16:14:53 -04:00
audit_tree.c
audit: audit_tree_match can be boolean
2015-11-04 08:23:51 -05:00
audit_watch.c
audit: fix use-after-free in audit_add_watch
2018-09-26 08:35:08 +02:00
audit.c
audit: return on memory error to avoid null pointer dereference
2018-05-30 07:49:16 +02:00
audit.h
audit: audit_tree_match can be boolean
2015-11-04 08:23:51 -05:00
auditfilter.c
audit: fix a memory leak bug
2019-06-11 12:23:58 +02:00
auditsc.c
audit: print empty EXECVE args
2019-11-28 18:26:01 +01:00
backtracetest.c
…
bounds.c
kbuild: fix kernel/bounds.c 'W=1' warning
2018-11-21 09:27:35 +01:00
capability.c
exec: Ensure mm->user_ns contains the execed files
2017-01-06 11:16:14 +01:00
cgroup_freezer.c
cgroup: fix handling of multi-destination migration from subtree_control enabling
2015-12-03 10:18:21 -05:00
cgroup_pids.c
cgroup: pids: use atomic64_t for pids->limit
2019-12-21 10:35:24 +01:00
cgroup.c
cgroup: Disable IRQs while holding css_set_lock
2019-09-06 10:18:11 +02:00
compat.c
…
configs.c
…
context_tracking.c
context_tracking: avoid irq_save/irq_restore on guest entry and exit
2015-11-10 12:06:23 +01:00
cpu_pm.c
kernel/cpu_pm: fix cpu_cluster_pm_exit comment
2015-09-03 02:42:20 +02:00
cpu.c
cpu/speculation: Warn on unsupported mitigations= parameter
2019-07-10 09:56:36 +02:00
cpuset.c
sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs
2017-10-12 11:27:35 +02:00
crash_dump.c
…
cred.c
access: avoid the RCU grace period for the temporary subjective credentials
2019-08-04 09:35:01 +02:00
delayacct.c
…
dma.c
…
elfcore.c
kernel/elfcore.c: include proper prototypes
2019-10-17 13:40:56 -07:00
exec_domain.c
…
exit.c
kernel/exit.c: release ptraced tasks before zap_pid_ns_processes
2019-02-06 19:43:07 +01:00
extable.c
kernel/extable.c: mark core_kernel_text notrace
2017-07-21 07:44:56 +02:00
fork.c
kernel/sysctl.c: do not override max_threads provided by userspace
2019-10-17 13:41:04 -07:00
freezer.c
…
futex_compat.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 12:01:16 -08:00
futex.c
futex: Fix futex lock the wrong page
2019-06-22 08:18:22 +02:00
groups.c
kernel: make groups_sort calling a responsibility group_info allocators
2018-01-10 09:27:10 +01:00
hung_task.c
kernel/hung_task.c: break RCU locks based on jiffies
2019-02-20 10:13:14 +01:00
irq_work.c
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
jump_label.c
jump_label: Invoke jump_label_test() via early_initcall()
2017-12-16 10:33:55 +01:00
kallsyms.c
…
kcmp.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 12:01:16 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kexec_core.c
kexec: use file name as the output message prefix
2015-11-06 17:50:42 -08:00
kexec_file.c
kexec: fix double-free when failing to relocate the purgatory
2016-09-24 10:07:36 +02:00
kexec_internal.h
kexec: split kexec_file syscall code to kexec_file.c
2015-09-10 13:29:01 -07:00
kexec.c
kexec: use file name as the output message prefix
2015-11-06 17:50:42 -08:00
kmod.c
kmod: don't run async usermode helper as a child of kworker thread
2015-10-23 17:55:10 +09:00
kprobes.c
kprobes: Don't call BUG_ON() if there is a kprobe in use on free list
2019-11-25 15:53:55 +01:00
ksysfs.c
kexec: split kexec_load syscall from kexec core code
2015-09-10 13:29:01 -07:00
kthread.c
kthread, tracing: Don't expose half-written comm when creating kthreads
2018-09-09 20:04:34 +02:00
latencytop.c
…
Makefile
sys_membarrier(): system-wide memory barrier (generic, x86)
2015-09-11 15:21:34 -07:00
membarrier.c
Fix: Disable sys_membarrier when nohz_full is enabled
2017-03-12 06:37:26 +01:00
memremap.c
mm, devm_memremap_pages: kill mapping "System RAM" support
2019-01-13 10:05:32 +01:00
module_signing.c
KEYS: Merge the type-specific data with the payload data
2015-10-21 15:18:36 +01:00
module-internal.h
…
module.c
kernel/module.c: wakeup processes in module_wq on module unload
2019-12-21 10:35:38 +01:00
notifier.c
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-09-01 08:40:25 -07:00
nsproxy.c
…
padata.c
padata: Remove broken queue flushing
2020-02-28 15:38:49 +01:00
panic.c
panic: ensure preemption is disabled during panic()
2019-10-17 13:40:58 -07:00
params.c
Nothing exciting, minor tweaks and cleanups.
2015-11-09 15:53:39 -08:00
pid_namespace.c
signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig
2019-08-04 09:34:42 +02:00
pid.c
pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()
2018-04-13 19:50:03 +02:00
profile.c
profile: hide unused functions when !CONFIG_PROC_FS
2018-02-25 11:03:44 +01:00
ptrace.c
ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME
2019-07-10 09:56:42 +02:00
range.c
…
reboot.c
kexec: split kexec_load syscall from kexec core code
2015-09-10 13:29:01 -07:00
relay.c
kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE
2018-05-30 07:49:00 +02:00
resource.c
resource: fix integer overflow at reallocation
2018-04-24 09:32:05 +02:00
seccomp.c
seccomp: Move speculation migitation control to arch code
2018-07-25 10:18:27 +02:00
signal.c
signal: Allow cifs and drbd to receive their terminating signals
2020-01-29 10:21:47 +01:00
smp.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
smpboot.c
stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()
2015-10-20 10:23:55 +02:00
smpboot.h
…
softirq.c
…
stacktrace.c
…
stop_machine.c
kernel: remove stop_machine() Kconfig dependency
2015-12-12 10:15:34 -08:00
sys_ni.c
mm: mlock: add new mlock system call
2015-11-05 19:34:48 -08:00
sys.c
kernel/sys.c: prctl: fix false positive in validate_prctl_map()
2019-06-22 08:18:18 +02:00
sysctl_binary.c
fs/coredump: prevent fsuid=0 dumps into user-controlled directories
2016-04-12 09:08:58 -07:00
sysctl.c
kernel: sysctl: make drop_caches write-only
2020-01-04 13:34:37 +01:00
task_work.c
task_work: remove fifo ordering guarantee
2015-09-05 13:46:58 -07:00
taskstats.c
taskstats: fix data-race
2020-01-12 11:22:40 +01:00
test_kprobes.c
…
torture.c
torture: Consolidate cond_resched_rcu_qs() into stutter_wait()
2015-10-06 11:25:01 -07:00
tracepoint.c
tracepoint: Do not warn on ENOMEM
2018-05-16 10:06:47 +02:00
tsacct.c
…
uid16.c
kernel: make groups_sort calling a responsibility group_info allocators
2018-01-10 09:27:10 +01:00
up.c
…
user_namespace.c
userns: move user access out of the mutex
2018-09-09 20:04:35 +02:00
user-return-notifier.c
…
user.c
…
utsname_sysctl.c
sys: don't hold uts_sem while accessing userspace memory
2018-09-09 20:04:35 +02:00
utsname.c
…
watchdog.c
kernel/watchdog: use nmi registers snapshot in hardlockup handler
2017-01-06 11:16:16 +01:00
workqueue_internal.h
workqueue: Fix NULL pointer dereference
2017-11-15 17:13:11 +01:00
workqueue.c
workqueue: Fix missing kfree(rescuer) in destroy_workqueue()
2019-12-21 10:35:37 +01:00