linux-stable/kernel
Wen Yang 1a2985af2a ftrace: Avoid potential division by zero in function profiler
commit e31f7939c1 upstream.

The ftrace_profile->counter is unsigned long and
do_div truncates it to 32 bits, which means it can test
non-zero and be truncated to zero for division.
Fix this issue by using div64_ul() instead.

Link: http://lkml.kernel.org/r/20200103030248.14516-1-wenyang@linux.alibaba.com

Cc: stable@vger.kernel.org
Fixes: e330b3bcd8 ("tracing: Show sample std dev in function profiling")
Fixes: 34886c8bc5 ("tracing: add average time in function to function profiler")
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-12 11:24:15 +01:00
..
bpf bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K 2019-08-25 10:51:50 +02:00
configs config: android: enable CONFIG_SECCOMP 2016-10-11 15:06:32 -07:00
debug kdb: use memmove instead of overlapping memcpy 2018-12-08 13:05:05 +01:00
events signal: Properly deliver SIGILL from uprobes 2019-11-25 09:52:12 +01:00
gcov gcov: support GCC 7.1 2017-09-02 07:07:53 +02:00
irq genirq: Prevent NULL pointer dereference in resend_irqs() 2019-09-21 07:14:04 +02:00
livepatch livepatch/module: make TAINT_LIVEPATCH module-specific 2016-08-26 14:42:08 +02:00
locking locking/lockdep: Add debug_locks check in __lock_downgrade() 2019-10-05 12:30:10 +02:00
power PM / hibernate: memory_bm_find_bit(): Tighten node optimisation 2020-01-12 11:24:11 +01:00
printk printk: fix integer overflow in setup_log_buf() 2019-11-28 18:28:15 +01:00
rcu rcuperf: Fix cleanup path for invalid perf_type strings 2019-05-31 06:48:30 -07:00
sched sched/fair: Scale bandwidth quota and period without losing quota/period ratio precision 2019-12-21 10:41:28 +01:00
time hrtimer: Annotate lockless access to timer->state 2020-01-04 13:41:08 +01:00
trace ftrace: Avoid potential division by zero in function profiler 2020-01-12 11:24:15 +01:00
.gitignore
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
Makefile x86/uaccess, kcov: Disable stack protector 2019-06-22 08:17:19 +02:00
acct.c kernel/acct.c: fix the acct->needcheck check in check_free_space() 2018-01-10 09:29:51 +01:00
async.c kernel/async.c: revert "async: simplify lowest_in_progress()" 2018-02-17 13:21:18 +01:00
audit.c audit: return on memory error to avoid null pointer dereference 2018-05-30 07:50:49 +02:00
audit.h Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit 2016-07-29 17:54:17 -07:00
audit_fsnotify.c
audit_tree.c
audit_watch.c audit_get_nd(): don't unlock parent too early 2019-12-21 10:40:48 +01:00
auditfilter.c audit: fix a memory leak bug 2019-05-31 06:48:20 -07:00
auditsc.c audit: print empty EXECVE args 2019-11-28 18:28:55 +01:00
backtracetest.c
bounds.c kbuild: fix kernel/bounds.c 'W=1' warning 2018-11-13 11:16:57 -08:00
capability.c ptrace: Capture the ptracer's creds not PT_PTRACE_CAP 2017-01-06 10:40:13 +01:00
cgroup.c cgroup: Fix deadlock in cpu hotplug path 2018-10-13 09:18:56 +02:00
cgroup_freezer.c
cgroup_pids.c cgroup: pids: use atomic64_t for pids->limit 2019-12-21 10:42:02 +01:00
compat.c
configs.c
context_tracking.c
cpu.c cpu/SMT: State SMT is disabled even with nosmt and without "=force" 2019-11-25 09:53:32 +01:00
cpu_pm.c
cpuset.c sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs 2017-10-12 11:51:25 +02:00
crash_dump.c
cred.c memcg: account security cred as well to kmemcg 2020-01-12 11:24:13 +01:00
delayacct.c
dma.c
elfcore.c kernel/elfcore.c: include proper prototypes 2019-10-17 13:42:13 -07:00
exec_domain.c
exit.c kernel/exit.c: release ptraced tasks before zap_pid_ns_processes 2019-02-06 17:33:29 +01:00
extable.c kernel/extable.c: mark core_kernel_text notrace 2017-07-21 07:42:21 +02:00
fork.c kernel/sysctl.c: do not override max_threads provided by userspace 2019-10-17 13:42:44 -07:00
freezer.c freezer, oom: check TIF_MEMDIE on the correct task 2016-07-28 16:07:41 -07:00
futex.c futex: Ensure that futex address is aligned in handle_futex_death() 2019-03-27 14:13:03 +09:00
futex_compat.c
groups.c kernel: make groups_sort calling a responsibility group_info allocators 2018-01-10 09:29:52 +01:00
hung_task.c kernel: hung_task.c: disable on suspend 2019-04-20 09:07:52 +02:00
irq_work.c
jump_label.c jump_label: Invoke jump_label_test() via early_initcall() 2017-12-14 09:28:24 +01:00
kallsyms.c
kcmp.c
kcov.c kcov: ensure irq code sees a valid area 2018-08-03 07:55:12 +02:00
kexec.c kexec: allow architectures to override boot mapping 2016-08-02 19:35:27 -04:00
kexec_core.c objtool, x86: Add several functions and files to the objtool whitelist 2018-06-05 10:28:57 +02:00
kexec_file.c kexec: fix double-free when failing to relocate the purgatory 2016-09-01 17:52:01 -07:00
kexec_internal.h
kmod.c
kprobes.c kprobes: Don't call BUG_ON() if there is a kprobe in use on free list 2019-11-25 09:52:15 +01:00
ksysfs.c kexec: add a kexec_crash_loaded() function 2016-08-02 19:35:30 -04:00
kthread.c kthread, tracing: Don't expose half-written comm when creating kthreads 2018-08-03 07:55:12 +02:00
latencytop.c
membarrier.c Fix: Disable sys_membarrier when nohz_full is enabled 2017-03-12 06:41:45 +01:00
memremap.c mm, devm_memremap_pages: kill mapping "System RAM" support 2019-01-13 10:03:51 +01:00
module-internal.h
module.c kernel/module.c: wakeup processes in module_wq on module unload 2019-12-21 10:42:21 +01:00
module_signing.c
notifier.c
nsproxy.c
padata.c padata: use smp_mb in padata_reorder to avoid orphaned padata jobs 2019-08-04 09:33:28 +02:00
panic.c panic: ensure preemption is disabled during panic() 2019-10-17 13:42:25 -07:00
params.c
pid.c pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid() 2018-04-13 19:47:53 +02:00
pid_namespace.c signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig 2019-08-04 09:33:16 +02:00
profile.c profile: Convert to hotplug state machine 2016-07-15 10:41:42 +02:00
ptrace.c ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME 2019-07-10 09:55:45 +02:00
range.c
reboot.c
relay.c kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE 2018-05-30 07:50:29 +02:00
resource.c resource: fix integer overflow at reallocation 2018-04-24 09:34:09 +02:00
seccomp.c seccomp: Move speculation migitation control to arch code 2018-05-22 16:58:02 +02:00
signal.c signal: Always ignore SIGKILL and SIGSTOP sent to the global init 2019-11-25 09:52:12 +01:00
smp.c cpu/hotplug: Fix SMT supported evaluation 2018-08-15 18:14:53 +02:00
smpboot.c kthread/smpboot: do not park in kthread_create_on_cpu() 2016-10-11 15:06:33 -07:00
smpboot.h
softirq.c Mark HI and TASKLET softirq synchronous 2018-08-15 18:14:42 +02:00
stacktrace.c stacktrace, lockdep: Fix address, newline ugliness 2017-02-14 15:25:42 -08:00
stop_machine.c stop_machine: Use raw spinlocks 2018-08-03 07:55:24 +02:00
sys.c kernel/sys.c: prctl: fix false positive in validate_prctl_map() 2019-06-22 08:17:13 +02:00
sys_ni.c x86/pkeys: Fix pkeys build breakage for some non-x86 arches 2016-09-13 14:41:36 +02:00
sysctl.c kernel: sysctl: make drop_caches write-only 2020-01-04 13:41:04 +01:00
sysctl_binary.c kernel/sysctl_binary.c: use generic UUID library 2016-05-20 17:58:30 -07:00
task_work.c task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works 2016-08-02 19:35:02 -04:00
taskstats.c taskstats: fix data-race 2020-01-12 11:24:12 +01:00
test_kprobes.c
torture.c torture: Convert torture_shutdown() to hrtimer 2016-08-22 10:01:49 -07:00
tracepoint.c tracepoint: Do not warn on ENOMEM 2018-05-09 09:50:20 +02:00
tsacct.c
ucount.c kernel/ucount.c: mark user_header with kmemleak_ignore() 2017-06-17 06:41:51 +02:00
uid16.c kernel: make groups_sort calling a responsibility group_info allocators 2018-01-10 09:29:52 +01:00
up.c smp: Add function to execute a function synchronously on a CPU 2016-09-05 13:52:39 +02:00
user-return-notifier.c
user.c
user_namespace.c userns: move user access out of the mutex 2018-09-09 20:01:24 +02:00
utsname.c Merge branch 'nsfs-ioctls' into HEAD 2016-09-22 20:00:36 -05:00
utsname_sysctl.c sys: don't hold uts_sem while accessing userspace memory 2018-09-09 20:01:24 +02:00
watchdog.c kernel/watchdog: prevent false hardlockup on overloaded system 2017-06-17 06:41:57 +02:00
watchdog_hld.c kernel/watchdog: prevent false hardlockup on overloaded system 2017-06-17 06:41:57 +02:00
workqueue.c workqueue: Fix missing kfree(rescuer) in destroy_workqueue() 2019-12-21 10:42:19 +01:00
workqueue_internal.h workqueue: Fix NULL pointer dereference 2017-11-15 15:53:17 +01:00