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Kees Cook a7cc1b5d76 exit: Use READ_ONCE() for all oops/warn limit reads 
commit 7535b832c6399b5ebfc5b53af5c51dd915ee2538 upstream.

Use a temporary variable to take full advantage of READ_ONCE() behavior.
Without this, the report (and even the test) might be out of sync with
the initial test.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/lkml/Y5x7GXeluFmZ8E0E@hirez.programming.kicks-ass.net
Fixes: 9fc9e278a5c0 ("panic: Introduce warn_limit")
Fixes: d4ccd54d28d3 ("exit: Put an upper limit on how often we can oops")
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Jann Horn <jannh@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: tangmeng <tangmeng@uniontech.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-06 07:52:50 +01:00
..
bpf
bpf: Fix pointer-leak due to insufficient speculative store bypass mitigation
2023-02-06 07:52:36 +01:00
cgroup
memcg: fix possible use-after-free in memcg_write_event_control()
2022-12-14 11:30:43 +01:00
configs
…
debug
lockdown: also lock down previous kgdb use
2022-06-06 08:33:48 +02:00
dma
dma-debug: make things less spammy under memory pressure
2022-06-22 14:11:19 +02:00
events
perf: Fix possible memleak in pmu_dev_alloc()
2023-01-18 11:40:53 +01:00
gcov
gcov: add support for checksum field
2023-01-18 11:41:42 +01:00
irq
genirq/irqdesc: Don't try to remove non-existing sysfs files
2023-01-18 11:40:55 +01:00
livepatch
livepatch: fix race between fork and KLP transition
2022-10-26 13:22:18 +02:00
locking
locking/lockdep: Avoid RCU-induced noinstr fail
2021-11-17 09:48:28 +01:00
power
PM: hibernate: Fix mistake in kerneldoc comment
2023-01-18 11:40:53 +01:00
printk
printk: fix return value of printk.devkmsg __setup handler
2022-04-15 14:18:08 +02:00
rcu
rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()
2023-01-18 11:41:33 +01:00
sched
panic: Consolidate open-coded panic_on_warn checks
2023-02-06 07:52:50 +01:00
time
timekeeping: contribute wall clock to rng on time change
2022-08-25 11:18:15 +02:00
trace
bpf: Skip task with pid=1 in send_signal_common()
2023-02-06 07:52:48 +01:00
.gitignore
kbuild: update config_data.gz only when the content of .config is changed
2021-05-11 14:04:16 +02:00
acct.c
acct: fix potential integer overflow in encode_comp_t()
2023-01-18 11:41:34 +01:00
async.c
Revert "module, async: async_synchronize_full() on module init iff async is used"
2022-02-23 11:59:56 +01:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-09-05 10:27:38 +02:00
audit_tree.c
audit: move put_tree() to avoid trim_trees refcount underflow and UAF
2021-09-03 10:08:16 +02:00
audit_watch.c
audit: CONFIG_CHANGE don't log internal bookkeeping as an event
2020-10-01 13:17:32 +02:00
audit.c
audit: improve audit queue handling when "audit=1" on cmdline
2022-02-08 18:24:26 +01:00
audit.h
audit: log AUDIT_TIME_* records only from rules
2022-04-15 14:18:04 +02:00
auditfilter.c
audit: fix a net reference leak in audit_list_rules_send()
2020-06-22 09:30:59 +02:00
auditsc.c
audit: log AUDIT_TIME_* records only from rules
2022-04-15 14:18:04 +02:00
backtracetest.c
…
bounds.c
…
capability.c
…
compat.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
configs.c
kernel/configs: Replace GPL boilerplate code with SPDX identifier
2019-07-30 18:34:15 +02:00
context_tracking.c
…
cpu_pm.c
kernel/cpu_pm: Fix uninitted local in cpu_pm
2020-06-22 09:31:22 +02:00
cpu.c
random: clear fast pool, crng, and batches in cpuhp bring up
2022-06-22 14:11:12 +02:00
crash_core.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230
2019-06-19 17:09:06 +02:00
crash_dump.c
…
cred.c
keys: Fix request_key() cache
2020-01-17 19:48:42 +01:00
delayacct.c
…
dma.c
…
exec_domain.c
…
exit.c
exit: Use READ_ONCE() for all oops/warn limit reads
2023-02-06 07:52:50 +01:00
extable.c
extable: Add function to search only kernel exception table
2019-08-21 22:23:48 +10:00
fail_function.c
fail_function: Remove a redundant mutex unlock
2020-11-24 13:29:18 +01:00
fork.c
copy_process(): Move fd_install() out of sighand->siglock critical section
2022-02-23 12:00:00 +01:00
freezer.c
Revert "libata, freezer: avoid block device removal while system is frozen"
2019-10-06 09:11:37 -06:00
futex.c
mm, futex: fix shared futex pgoff on shmem huge page
2021-06-30 08:47:55 -04:00
gen_kheaders.sh
kbuild: add variables for compression tools
2020-09-03 11:27:10 +02:00
groups.c
…
hung_task.c
…
iomem.c
mm/nvdimm: add is_ioremap_addr and use that to check ioremap address
2019-07-12 11:05:40 -07:00
irq_work.c
…
jump_label.c
jump_label: Don't warn on __exit jump entries
2019-08-29 15:10:10 +01:00
kallsyms.c
kallsyms: Refactor kallsyms_show_value() to take cred
2020-07-16 08:16:44 +02:00
kcmp.c
exec: Transform exec_update_mutex into a rw_semaphore
2021-01-09 13:44:55 +01:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
sched/rt, Kconfig: Unbreak def/oldconfig with CONFIG_PREEMPT=y
2019-07-22 18:05:11 +02:00
kcov.c
…
kexec_core.c
kernel: kexec: remove the lock operation of system_transition_mutex
2021-02-03 23:25:56 +01:00
kexec_elf.c
kexec_elf: support 32 bit ELF files
2019-09-06 23:58:44 +02:00
kexec_file.c
kexec_file: drop weak attribute from arch_kexec_apply_relocations[_add]
2022-07-02 16:28:50 +02:00
kexec_internal.h
…
kexec.c
kexec_load: Disable at runtime if the kernel is locked down
2019-08-19 21:54:15 -07:00
kheaders.c
…
kmod.c
kmod: make request_module() return an error when autoloading is disabled
2020-04-17 10:50:22 +02:00
kprobes.c
kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case
2022-11-25 17:42:21 +01:00
ksysfs.c
…
kthread.c
kthread: Fix PF_KTHREAD vs to_kthread() race
2021-09-12 08:56:39 +02:00
latencytop.c
…
Makefile
kbuild: update config_data.gz only when the content of .config is changed
2021-05-11 14:04:16 +02:00
module_signature.c
module: harden ELF info handling
2021-04-07 14:47:38 +02:00
module_signing.c
module: harden ELF info handling
2021-04-07 14:47:38 +02:00
module-internal.h
…
module.c
module: Don't wait for GOING modules
2023-02-06 07:52:43 +01:00
notifier.c
kernel/notifier.c: intercept duplicate registrations to avoid infinite loops
2020-10-01 13:17:23 +02:00
nsproxy.c
…
padata.c
padata: add separate cpuhp node for CPUHP_PADATA_DEAD
2020-06-17 16:40:22 +02:00
panic.c
exit: Use READ_ONCE() for all oops/warn limit reads
2023-02-06 07:52:50 +01:00
params.c
lockdown: Lock down module params that specify hardware parameters (eg. ioport)
2019-08-19 21:54:16 -07:00
pid_namespace.c
memcg: enable accounting for pids in nested pid namespaces
2021-09-22 12:26:37 +02:00
pid.c
kernel/pid.c: convert struct pid count to refcount_t
2019-07-16 19:23:24 -07:00
profile.c
profiling: fix shift too large makes kernel panic
2022-08-25 11:18:02 +02:00
ptrace.c
ptrace: Reimplement PTRACE_KILL by always sending SIGKILL
2022-06-14 18:11:24 +02:00
range.c
…
reboot.c
reboot: fix overflow parsing reboot cpu number
2020-11-18 19:20:30 +01:00
relay.c
relay: fix type mismatch when allocating memory in relay_create_buf()
2023-01-18 11:40:58 +01:00
resource.c
/dev/mem: Revoke mappings when a driver claims the region
2020-06-24 17:50:35 +02:00
rseq.c
…
seccomp.c
seccomp: Invalidate seccomp mode to catch death failures
2022-02-16 12:52:53 +01:00
signal.c
signal handling: don't use BUG_ON() for debugging
2022-07-21 20:59:27 +02:00
smp.c
smp: Fix offline cpu check in flush_smp_call_function_queue()
2022-04-20 09:19:39 +02:00
smpboot.c
kthread: Extract KTHREAD_IS_PER_CPU
2021-02-07 15:35:49 +01:00
smpboot.h
…
softirq.c
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-07-08 11:01:13 -07:00
stackleak.c
…
stacktrace.c
stacktrace: Don't skip first entry on noncurrent tasks
2019-11-04 21:19:25 +01:00
stop_machine.c
stop_machine: Avoid potential race behaviour
2019-10-17 12:47:12 +02:00
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-09-05 10:27:38 +02:00
sys.c
prlimit: do_prlimit needs to have a speculation check
2023-01-24 07:17:59 +01:00
sysctl_binary.c
…
sysctl-test.c
kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()
2020-10-01 13:17:10 +02:00
sysctl.c
proc: proc_skip_spaces() shouldn't think it is working on C strings
2022-12-08 11:23:06 +01:00
task_work.c
…
taskstats.c
taskstats: fix data-race
2020-01-09 10:19:54 +01:00
test_kprobes.c
…
torture.c
torture: Remove exporting of internal functions
2019-08-01 14:30:22 -07:00
tracepoint.c
tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
2021-07-14 16:53:08 +02:00
tsacct.c
taskstats: Cleanup the use of task->exit_code
2022-02-23 11:59:57 +01:00
ucount.c
proc/sysctl: add shared variables for range check
2019-07-18 17:08:07 -07:00
uid16.c
…
uid16.h
…
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-14 10:32:58 +02:00
up.c
smp: Fix smp_call_function_single_async prototype
2021-05-14 09:44:33 +02:00
user_namespace.c
Keyrings namespacing
2019-07-08 19:36:47 -07:00
user-return-notifier.c
…
user.c
Keyrings namespacing
2019-07-08 19:36:47 -07:00
utsname_sysctl.c
…
utsname.c
…
watchdog_hld.c
…
watchdog.c
watchdog: export lockup_detector_reconfigure
2022-08-25 11:18:37 +02:00
workqueue_internal.h
…
workqueue.c
workqueue: don't skip lockdep work dependency in cancel_work_sync()
2022-09-28 11:04:09 +02:00