Steven Rostedt (VMware) c1e6e42740 ring-buffer: Protect ring_buffer_reset() from reentrancy ... commit 51d157946666382e779f94c39891e8e9a020da78 upstream. The resetting of the entire ring buffer use to simply go through and reset each individual CPU buffer that had its own protection and synchronization. But this was very slow, due to performing a synchronization for each CPU. The code was reshuffled to do one disabling of all CPU buffers, followed by a single RCU synchronization, and then the resetting of each of the CPU buffers. But unfortunately, the mutex that prevented multiple occurrences of resetting the buffer was not moved to the upper function, and there is nothing to protect from it. Take the ring buffer mutex around the global reset. Cc: stable@vger.kernel.org Fixes: b23d7a5f4a ("ring-buffer: speed up buffer resets by avoiding synchronize_rcu for each CPU") Reported-by: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-11-18 14:03:49 +01:00
..
bpf	bpf: Prevent increasing bpf_jit_limit above max	2021-11-18 14:03:42 +01:00
cgroup	cgroup: Fix memory leak caused by missing cgroup_bpf_offline	2021-11-02 19:48:21 +01:00
configs
debug
dma	dma-debug: fix sg checks in debug_dma_map_sg()	2021-10-27 09:56:47 +02:00
entry	KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest	2021-10-06 15:55:49 +02:00
events	perf/core: fix userpage->time_enabled of inactive events	2021-10-17 10:43:33 +02:00
gcov
irq	genirq/timings: Fix error return code in irq_timings_test_irqs()	2021-09-15 09:50:29 +02:00
kcsan	kcsan: Fix debugfs initcall return type	2021-05-26 12:06:54 +02:00
livepatch
locking	locking/lockdep: Mark local_lock_t	2021-09-15 09:50:41 +02:00
power	PM: EM: Increase energy calculation precision	2021-09-15 09:50:37 +02:00
printk	printk/console: Allow to disable console output by using console="" or console=null	2021-11-12 14:58:33 +01:00
rcu	rcu: Fix macro name CONFIG_TASKS_RCU_TRACE	2021-09-18 13:40:19 +02:00
sched	sched/scs: Reset the shadow stack when idle_task_exit	2021-10-27 09:56:55 +02:00
time	Revert "posix-cpu-timers: Force next expiration recalc after itimer reset"	2021-09-16 12:51:23 +02:00
trace	ring-buffer: Protect ring_buffer_reset() from reentrancy	2021-11-18 14:03:49 +01:00
.gitignore	kbuild: update config_data.gz only when the content of .config is changed	2021-05-11 14:47:37 +02:00
acct.c
async.c
audit_fsnotify.c
audit_tree.c	audit: move put_tree() to avoid trim_trees refcount underflow and UAF	2021-09-03 10:09:31 +02:00
audit_watch.c
audit.c
audit.h
auditfilter.c
auditsc.c	audit: fix possible null-pointer dereference in audit_filter_rules	2021-10-27 09:56:52 +02:00
backtracetest.c
bounds.c
capability.c
compat.c
configs.c
context_tracking.c
cpu_pm.c	PM: cpu: Make notifier chain use a raw_spinlock_t	2021-09-15 09:50:40 +02:00
cpu.c	cpu/hotplug: Cure the cpusets trainwreck	2021-07-19 09:44:59 +02:00
crash_core.c	crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo	2021-06-23 14:42:52 +02:00
crash_dump.c
cred.c	Revert "Add a reference to ucounts for each cred"	2021-09-08 08:49:00 +02:00
delayacct.c
dma.c
exec_domain.c
exit.c
extable.c
fail_function.c
fork.c	mm/hugetlb: initialize hugetlb_usage in mm_init	2021-09-18 13:40:36 +02:00
freezer.c
futex.c	mm, futex: fix shared futex pgoff on shmem huge page	2021-06-30 08:47:29 -04:00
gen_kheaders.sh
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c	jump_label: Fix jump_label_text_reserved() vs __init	2021-07-20 16:05:58 +02:00
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec_core.c
kexec_elf.c
kexec_file.c	kernel: kexec_file: fix error return code of kexec_calculate_store_digests()	2021-05-19 10:13:09 +02:00
kexec_internal.h
kexec.c
kheaders.c
kmod.c
kprobes.c
ksysfs.c
kthread.c	kthread: Fix PF_KTHREAD vs to_kthread() race	2021-09-03 10:09:31 +02:00
latencytop.c
Makefile	kbuild: update config_data.gz only when the content of .config is changed	2021-05-11 14:47:37 +02:00
module_signature.c
module_signing.c
module-internal.h
module.c	module: limit enabling module.sig_enforce	2021-06-30 08:47:15 -04:00
notifier.c
nsproxy.c
padata.c
panic.c
params.c
pid_namespace.c	memcg: enable accounting for pids in nested pid namespaces	2021-09-18 13:40:36 +02:00
pid.c
profile.c	profiling: fix shift-out-of-bounds bugs	2021-09-26 14:08:58 +02:00
ptrace.c	ptrace: make ptrace() fail if the tracee changed its pid unexpectedly	2021-05-26 12:06:49 +02:00
range.c
reboot.c
regset.c
relay.c
resource.c	kernel/resource: make walk_mem_res() find all busy IORESOURCE_MEM resources	2021-05-19 10:13:09 +02:00
rseq.c	KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest	2021-10-06 15:55:49 +02:00
scftorture.c
scs.c
seccomp.c	seccomp: Fix setting loaded filter count during TSYNC	2021-08-18 08:59:06 +02:00
signal.c	signal: Remove the bogus sigkill_pending in ptrace_stop	2021-11-18 14:03:47 +01:00
smp.c	smp: Fix smp_call_function_single_async prototype	2021-05-14 09:50:46 +02:00
smpboot.c	sched/core: Initialize the idle task with preemption disabled	2021-07-14 16:55:50 +02:00
smpboot.h
softirq.c
stackleak.c
stacktrace.c
static_call.c	static_call: Fix unused variable warn w/o MODULE	2021-09-08 08:49:00 +02:00
stop_machine.c
sys_ni.c
sys.c	prctl: allow to setup brk for et_dyn executables	2021-09-26 14:08:57 +02:00
sysctl-test.c
sysctl.c
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Use rcu get state and cond sync for static call updates	2021-09-03 10:09:30 +02:00
tsacct.c
ucount.c	Revert "Add a reference to ucounts for each cred"	2021-09-08 08:49:00 +02:00
uid16.c
uid16.h
umh.c
up.c	smp: Fix smp_call_function_single_async prototype	2021-05-14 09:50:46 +02:00
user_namespace.c	Revert "Add a reference to ucounts for each cred"	2021-09-08 08:49:00 +02:00
user-return-notifier.c
user.c
usermode_driver.c
utsname_sysctl.c
utsname.c
watch_queue.c
watchdog_hld.c
watchdog.c	watchdog: fix barriers when printing backtraces from all CPUs	2021-05-19 10:13:00 +02:00
workqueue_internal.h
workqueue.c	workqueue: Fix possible memory leaks in wq_numa_init()	2021-09-18 13:40:23 +02:00