Tze-nan Wu 302ceb625d tracing: Fix overflow in get_free_elt() ... commit bcf86c01ca upstream. "tracing_map->next_elt" in get_free_elt() is at risk of overflowing. Once it overflows, new elements can still be inserted into the tracing_map even though the maximum number of elements (`max_elts`) has been reached. Continuing to insert elements after the overflow could result in the tracing_map containing "tracing_map->max_size" elements, leaving no empty entries. If any attempt is made to insert an element into a full tracing_map using `__tracing_map_insert()`, it will cause an infinite loop with preemption disabled, leading to a CPU hang problem. Fix this by preventing any further increments to "tracing_map->next_elt" once it reaches "tracing_map->max_elt". Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Fixes: 08d43a5fa0 ("tracing: Add lock-free tracing_map") Co-developed-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com> Link: https://lore.kernel.org/20240805055922.6277-1-Tze-nan.Wu@mediatek.com Signed-off-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com> Signed-off-by: Tze-nan Wu <Tze-nan.Wu@mediatek.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-08-19 05:32:16 +02:00
..
bpf	bpf: Fix stackmap overflow check on 32-bit arches	2024-03-26 18:22:36 -04:00
cgroup	sched/fair: Allow disabling sched_balance_newidle with sched_relax_domain_level	2024-06-16 13:23:32 +02:00
configs
debug	kdb: Use the passed prompt in kdb_position_cursor()	2024-08-19 05:32:06 +02:00
dma	dma: fix call order in dmam_free_coherent	2024-08-19 05:32:06 +02:00
events	perf: Prevent passing zero nr_pages to rb_alloc_aux()	2024-08-19 05:31:58 +02:00
gcov	gcov: add support for GCC 14	2024-07-05 09:00:29 +02:00
irq	genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline	2024-06-16 13:23:38 +02:00
livepatch	livepatch: fix race between fork and KLP transition	2022-10-26 13:19:23 +02:00
locking	locking/ww_mutex/test: Fix potential workqueue corruption	2023-11-28 16:46:30 +00:00
power	PM: suspend: Set mem_sleep_current during kernel command line setup	2024-04-13 12:50:04 +02:00
printk	printk: Update @console_may_schedule in console_trylock_spinning()	2024-04-13 12:50:09 +02:00
rcu	rcutorture: Fix rcu_torture_one_read() pipe_count overflow comment	2024-07-05 09:00:26 +02:00
sched	sched/fair: Allow disabling sched_balance_newidle with sched_relax_domain_level	2024-06-16 13:23:32 +02:00
time	ntp: Safeguard against time_constant overflow	2024-08-19 05:32:16 +02:00
trace	tracing: Fix overflow in get_free_elt()	2024-08-19 05:32:16 +02:00
.gitignore
acct.c	acct: fix potential integer overflow in encode_comp_t()	2023-01-18 11:30:34 +01:00
async.c	treewide: Remove uninitialized_var() usage	2023-08-11 11:45:01 +02:00
audit_fsnotify.c	audit: fix potential double free on error path from fsnotify_add_inode_mark	2022-09-05 10:26:28 +02:00
audit_tree.c	audit: Embed key into chunk	2019-12-13 08:51:11 +01:00
audit_watch.c	audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()	2023-11-28 16:46:34 +00:00
audit.c	audit: Send netlink ACK before setting connection in auditd_set	2024-02-23 08:12:44 +01:00
audit.h	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:05:13 +02:00
auditfilter.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:05:13 +02:00
auditsc.c	audit: fix possible soft lockup in __audit_inode_child()	2023-09-23 10:48:04 +02:00
backtracetest.c
bounds.c	kbuild: fix kernel/bounds.c 'W=1' warning	2018-11-13 11:08:47 -08:00
capability.c	LSM: generalize flag passing to security_capable	2020-01-23 08:21:29 +01:00
compat.c	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-04-05 11:15:39 +02:00
configs.c
context_tracking.c
cpu_pm.c	kernel/cpu_pm: Fix uninitted local in cpu_pm	2020-06-22 09:05:28 +02:00
cpu.c	hrtimers: Push pending hrtimers away from outgoing CPU earlier	2023-12-13 17:42:15 +01:00
crash_core.c	kernel/crash_core.c: print timestamp using time64_t	2018-08-22 10:52:47 -07:00
crash_dump.c
cred.c	cred: switch to using atomic_long_t	2023-12-20 15:38:01 +01:00
delayacct.c
dma.c
exec_domain.c
exit.c	mm: optimize the redundant loop of mm_update_owner_next()	2024-07-18 11:39:35 +02:00
extable.c	kernel/extable.c: use address-of operator on section symbols	2023-06-09 10:24:02 +02:00
fail_function.c	fail_function: Remove a redundant mutex unlock	2020-11-24 13:27:23 +01:00
fork.c	mm/hugetlb: initialize hugetlb_usage in mm_init	2021-09-22 11:48:09 +02:00
freezer.c	PM / reboot: Eliminate race between reboot and suspend	2018-08-06 12:35:20 +02:00
futex.c	treewide: Remove uninitialized_var() usage	2023-08-11 11:45:01 +02:00
groups.c
hung_task.c	kernel: hung_task.c: disable on suspend	2019-04-20 09:16:02 +02:00
iomem.c
irq_work.c	irq_work: Do not raise an IPI when queueing work on the local CPU	2019-05-31 06:46:19 -07:00
jump_label.c	locking/static_key: Fix false positive warnings on concurrent dec/inc	2021-03-04 09:39:30 +01:00
kallsyms.c	kallsyms: Refactor kallsyms_show_value() to take cred	2020-07-16 08:17:26 +02:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kernel/kcov.c: mark write_comp_data() as notrace	2019-02-12 19:47:20 +01:00
kexec_core.c	kexec: fix a memory leak in crash_shrink_memory()	2023-08-11 11:45:06 +02:00
kexec_file.c	kexec: support purgatories with .text.hot sections	2023-06-21 15:39:57 +02:00
kexec_internal.h
kexec.c
kmod.c	kmod: make request_module() return an error when autoloading is disabled	2020-04-17 10:48:52 +02:00
kprobes.c	kprobes: Fix possible use-after-free issue on kprobe registration	2024-05-02 16:17:09 +02:00
ksysfs.c
kthread.c	kthread: prevent deadlock when kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync()	2021-07-11 12:49:31 +02:00
latencytop.c
Makefile	elfcore: fix building with clang	2021-02-10 09:21:06 +01:00
memremap.c	mm/memory_hotplug: shrink zones when offlining memory	2020-01-29 16:43:27 +01:00
module_signing.c
module-internal.h
module.c	modules: only allow symbol_get of EXPORT_SYMBOL_GPL modules	2023-09-23 10:47:56 +02:00
notifier.c	x86/mm: split vmalloc_sync_all()	2020-03-25 08:06:13 +01:00
nsproxy.c
padata.c	crypto: pcrypt - Fix hungtask for PADATA_RESET	2023-11-28 16:46:31 +00:00
panic.c	exit: Use READ_ONCE() for all oops/warn limit reads	2023-02-06 07:49:46 +01:00
params.c	params: lift param_set_uint_minmax to common code	2024-06-16 13:23:35 +02:00
pid_namespace.c	memcg: enable accounting for pids in nested pid namespaces	2021-09-22 11:48:09 +02:00
pid.c	Fix failure path in alloc_pid()	2019-01-13 09:51:06 +01:00
profile.c	profiling: fix shift too large makes kernel panic	2022-08-25 11:15:20 +02:00
ptrace.c	ptrace: Reimplement PTRACE_KILL by always sending SIGKILL	2022-06-14 16:59:14 +02:00
range.c
reboot.c	reboot: fix overflow parsing reboot cpu number	2020-11-18 19:18:52 +01:00
relay.c	relayfs: fix out-of-bounds access in relay_file_read	2023-05-17 11:13:23 +02:00
resource.c	resource: fix locking in find_next_iomem_res()	2019-09-16 08:22:20 +02:00
rseq.c
seccomp.c	seccomp: Invalidate seccomp mode to catch death failures	2022-02-16 12:51:47 +01:00
signal.c	signal handling: don't use BUG_ON() for debugging	2022-07-21 21:09:32 +02:00
smp.c	smp: Fix offline cpu check in flush_smp_call_function_queue()	2022-04-20 09:12:50 +02:00
smpboot.c	kthread: Extract KTHREAD_IS_PER_CPU	2021-02-07 14:48:38 +01:00
smpboot.h
softirq.c
stacktrace.c
stop_machine.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-08-13 11:25:07 -07:00
sys_ni.c	kernel/sys_ni: add compat entry for fadvise64_64	2022-09-05 10:26:28 +02:00
sys.c	Revert "y2038: rusage: use __kernel_old_timeval"	2024-05-02 16:17:14 +02:00
sysctl_binary.c
sysctl.c	sched/rt: Disallow writing invalid values to sched_rt_period_us	2024-03-01 13:06:08 +01:00
task_work.c
taskstats.c	taskstats: fix data-race	2020-01-09 10:18:59 +01:00
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing	2021-07-20 16:15:42 +02:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-02-23 11:58:39 +01:00
ucount.c
uid16.c
uid16.h
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-14 10:31:21 +02:00
up.c	smp: Fix smp_call_function_single_async prototype	2021-05-22 10:59:39 +02:00
user_namespace.c	userns: also map extents in the reverse map to kernel IDs	2018-11-13 11:09:00 -08:00
user-return-notifier.c
user.c	userns: use irqsave variant of refcount_dec_and_lock()	2018-08-22 10:52:47 -07:00
utsname_sysctl.c	sys: don't hold uts_sem while accessing userspace memory	2018-08-11 02:05:53 -05:00
utsname.c
watchdog_hld.c	watchdog/perf: properly initialize the turbo mode timestamp and rearm counter	2024-08-19 05:32:05 +02:00
watchdog.c	watchdog: export lockup_detector_reconfigure	2022-08-25 11:15:46 +02:00
workqueue_internal.h
workqueue.c	workqueue: Override implicit ordered attribute in workqueue_apply_unbound_cpumask()	2023-10-25 11:16:26 +02:00