linux/kernel
Song Liu a3623db43a perf/core: Fix mlock accounting in perf_mmap()
commit 003461559e upstream.

Decreasing sysctl_perf_event_mlock between two consecutive perf_mmap()s of
a perf ring buffer may lead to an integer underflow in locked memory
accounting. This may lead to the undesired behaviors, such as failures in
BPF map creation.

Address this by adjusting the accounting logic to take into account the
possibility that the amount of already locked memory may exceed the
current limit.

Fixes: c4b7547974 ("perf/core: Make the mlock accounting simple again")
Suggested-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: <stable@vger.kernel.org>
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lkml.kernel.org/r/20200123181146.2238074-1-songliubraving@fb.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-02-11 04:34:19 -08:00
..
bpf bpf, offload: Unlock on error in bpf_offload_dev_create() 2020-01-27 14:51:20 +01:00
cgroup cgroup: Prevent double killing of css when enabling threaded cgroup 2020-02-05 14:43:39 +00:00
configs
debug kdb: do a sanity check on the cpu in kdb_per_cpu() 2020-01-27 14:50:48 +01:00
dma dma-debug: add a schedule point in debug_dma_dump_mappings() 2020-01-04 19:12:43 +01:00
events perf/core: Fix mlock accounting in perf_mmap() 2020-02-11 04:34:19 -08:00
gcov
irq x86/apic/msi: Plug non-maskable MSI affinity race 2020-02-11 04:34:18 -08:00
livepatch
locking locking/spinlock/debug: Fix various data races 2020-01-12 12:17:05 +01:00
power PM / hibernate: memory_bm_find_bit(): Tighten node optimisation 2020-01-09 10:18:58 +01:00
printk printk: fix exclusive_console replaying 2020-02-11 04:33:51 -08:00
rcu rcu: Avoid data-race in rcu_gp_fqs_check_wake() 2020-02-11 04:33:55 -08:00
sched sched/fair: Fix insertion in rq->leaf_cfs_rq_list 2020-02-01 09:37:10 +00:00
time clocksource: Prevent double add_timer_on() for watchdog_timer 2020-02-11 04:34:18 -08:00
trace ftrace: Protect ftrace_graph_hash with ftrace_sync 2020-02-11 04:34:05 -08:00
.gitignore
acct.c
async.c
audit_fsnotify.c
audit_tree.c audit: Embed key into chunk 2019-12-13 08:51:11 +01:00
audit_watch.c audit_get_nd(): don't unlock parent too early 2019-12-13 08:51:02 +01:00
audit.c
audit.h
auditfilter.c
auditsc.c audit: print empty EXECVE args 2019-12-01 09:17:17 +01:00
backtracetest.c
bounds.c
capability.c LSM: generalize flag passing to security_capable 2020-01-23 08:21:29 +01:00
compat.c
configs.c
context_tracking.c
cpu_pm.c
cpu.c cpu/SMT: State SMT is disabled even with nosmt and without "=force" 2019-11-24 08:20:18 +01:00
crash_core.c
crash_dump.c
cred.c memcg: account security cred as well to kmemcg 2020-01-09 10:19:00 +01:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c exit: panic before exit_mm() on global init exit 2020-01-09 10:19:02 +01:00
extable.c
fail_function.c
fork.c fork,memcg: alloc_thread_stack_node needs to set tsk->stack 2020-01-27 14:50:58 +01:00
freezer.c
futex.c futex: Prevent robust futex exit race 2019-12-01 09:17:38 +01:00
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec_core.c kexec: Allocate decrypted control pages for kdump if SME is enabled 2019-11-24 08:20:29 +01:00
kexec_file.c
kexec_internal.h
kexec.c
kmod.c
kprobes.c kprobes: Blacklist symbols in arch-defined prohibited area 2019-12-05 09:20:26 +01:00
ksysfs.c
kthread.c
latencytop.c
Makefile y2038: futex: Move compat implementation into futex.c 2019-12-01 09:17:38 +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 kernel/module: Fix memleak in module_add_modinfo_attrs() 2020-02-11 04:33:50 -08:00
notifier.c
nsproxy.c
padata.c padata: Remove broken queue flushing 2020-02-11 04:34:04 -08:00
panic.c kernel/panic.c: do not append newline to the stack protector panic string 2019-12-01 09:17:10 +01:00
params.c
pid_namespace.c
pid.c
profile.c
ptrace.c ptrace: reintroduce usage of subjective credentials in ptrace_has_cap() 2020-01-23 08:21:29 +01:00
range.c
reboot.c
relay.c
resource.c
rseq.c
seccomp.c LSM: generalize flag passing to security_capable 2020-01-23 08:21:29 +01:00
signal.c signal: Allow cifs and drbd to receive their terminating signals 2020-01-27 14:51:05 +01:00
smp.c
smpboot.c
smpboot.h
softirq.c
stacktrace.c
stop_machine.c
sys_ni.c
sys.c
sysctl_binary.c
sysctl.c kernel: sysctl: make drop_caches write-only 2020-01-04 19:13:17 +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
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c
up.c
user_namespace.c
user-return-notifier.c
user.c
utsname_sysctl.c
utsname.c
watchdog_hld.c
watchdog.c
workqueue_internal.h
workqueue.c workqueue: Fix missing kfree(rescuer) in destroy_workqueue() 2019-12-17 20:35:50 +01:00