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Song Liu 7438239690 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 04:35:54 -08:00
..
bpf
bpf, devmap: Pass lockdep expression to RCU lists
2020-02-11 04:35:29 -08:00
cgroup
cgroup: Prevent double killing of css when enabling threaded cgroup
2020-02-05 21:22:42 +00:00
configs
…
debug
kgdb: don't use a notifier to enter kgdb at panic; call directly
2019-09-25 17:51:40 -07:00
dma
dma-direct: don't check swiotlb=force in dma_direct_map_resource
2020-01-26 10:01:08 +01:00
events
perf/core: Fix mlock accounting in perf_mmap()
2020-02-11 04:35:54 -08:00
gcov
Revert "um: Enable CONFIG_CONSTRUCTORS"
2020-02-01 09:34:53 +00:00
irq
x86/apic/msi: Plug non-maskable MSI affinity race
2020-02-11 04:35:54 -08:00
livepatch
livepatch: Nullify obj->mod in klp_module_coming()'s error path
2019-08-19 13:03:37 +02:00
locking
locking/lockdep: Fix buffer overrun problem in stack_trace[]
2020-01-23 08:22:39 +01:00
power
PM: hibernate: fix crashes with init_on_free=1
2020-01-29 16:45:25 +01:00
printk
Merge branch 'for-5.4' into for-linus
2019-09-16 12:54:25 +02:00
rcu
rcu: Use READ_ONCE() for ->expmask in rcu_read_unlock_special()
2020-02-11 04:35:08 -08:00
sched
sched/cpufreq: Move the cfs_rq_util_change() call to cpufreq_update_util()
2020-01-26 10:01:08 +01:00
time
clocksource: Prevent double add_timer_on() for watchdog_timer
2020-02-11 04:35:54 -08:00
trace
ftrace: Protect ftrace_graph_hash with ftrace_sync
2020-02-11 04:35:28 -08:00
.gitignore
…
acct.c
…
async.c
…
audit_fsnotify.c
…
audit_tree.c
…
audit_watch.c
audit_get_nd(): don't unlock parent too early
2019-11-10 11:56:55 -05:00
audit.c
…
audit.h
…
auditfilter.c
…
auditsc.c
…
backtracetest.c
…
bounds.c
…
capability.c
…
compat.c
…
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
…
cpu.c
cpu/SMT: Fix x86 link error without CONFIG_SYSFS
2020-01-23 08:22:36 +01:00
crash_core.c
…
crash_dump.c
…
cred.c
keys: Fix request_key() cache
2020-01-17 19:48:42 +01:00
delayacct.c
…
dma.c
…
elfcore.c
kernel/elfcore.c: include proper prototypes
2019-09-25 17:51:39 -07:00
exec_domain.c
…
exit.c
exit: panic before exit_mm() on global init exit
2020-01-09 10:20:01 +01:00
extable.c
extable: Add function to search only kernel exception table
2019-08-21 22:23:48 +10:00
fail_function.c
…
fork.c
clone3: ensure copy_thread_tls is implemented
2020-01-14 20:08:35 +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
futex: Prevent exit livelock
2019-11-29 10:10:14 +01:00
gen_kheaders.sh
kheaders: substituting --sort in archive creation
2019-10-17 09:08:19 +09:00
groups.c
…
hung_task.c
…
iomem.c
…
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: Don't let kallsyms_lookup_size_offset() fail on retrieving the first symbol
2019-08-27 16:19:56 +01:00
kcmp.c
…
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
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kexec_core.c
kexec: bail out upon SIGKILL when allocating memory.
2019-09-25 17:51:40 -07:00
kexec_elf.c
kexec_elf: support 32 bit ELF files
2019-09-06 23:58:44 +02:00
kexec_file.c
Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2019-09-28 08:14:15 -07:00
kexec_internal.h
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kexec.c
kexec_load: Disable at runtime if the kernel is locked down
2019-08-19 21:54:15 -07:00
kheaders.c
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kmod.c
…
kprobes.c
Merge tag 'trace-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2019-09-20 11:19:48 -07:00
ksysfs.c
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kthread.c
kthread: make __kthread_queue_delayed_work static
2019-10-16 09:20:58 -07:00
latencytop.c
…
Makefile
Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity
2019-09-27 19:37:27 -07:00
module_signature.c
MODSIGN: Export module signature definitions
2019-08-05 18:39:56 -04:00
module_signing.c
MODSIGN: Export module signature definitions
2019-08-05 18:39:56 -04:00
module-internal.h
…
module.c
kernel/module.c: wakeup processes in module_wq on module unload
2020-01-09 10:20:02 +01:00
notifier.c
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nsproxy.c
…
padata.c
crypto: pcrypt - Avoid deadlock by using per-instance padata queues
2020-02-11 04:35:28 -08:00
panic.c
panic: ensure preemption is disabled during panic()
2019-10-07 15:47:19 -07:00
params.c
lockdown: Lock down module params that specify hardware parameters (eg. ioport)
2019-08-19 21:54:16 -07:00
pid_namespace.c
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pid.c
…
profile.c
…
ptrace.c
ptrace: reintroduce usage of subjective credentials in ptrace_has_cap()
2020-01-23 08:22:36 +01:00
range.c
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reboot.c
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relay.c
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resource.c
mm/memory_hotplug.c: use PFN_UP / PFN_DOWN in walk_system_ram_range()
2019-09-24 15:54:09 -07:00
rseq.c
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seccomp.c
seccomp: Check that seccomp_notif is zeroed out by the user
2020-01-09 10:19:57 +01:00
signal.c
cgroup: freezer: call cgroup_enter_frozen() with preemption disabled in ptrace_stop()
2019-10-11 08:39:57 -07:00
smp.c
smp: Warn on function calls from softirq context
2019-07-20 11:27:16 +02:00
smpboot.c
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smpboot.h
…
softirq.c
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stackleak.c
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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
…
sys.c
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-09-17 12:35:15 -07:00
sysctl_binary.c
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sysctl.c
kernel: sysctl: make drop_caches write-only
2020-01-04 19:18:32 +01:00
task_work.c
…
taskstats.c
taskstats: fix data-race
2020-01-09 10:19:54 +01:00
test_kprobes.c
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torture.c
torture: Remove exporting of internal functions
2019-08-01 14:30:22 -07:00
tracepoint.c
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tsacct.c
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ucount.c
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uid16.c
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uid16.h
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umh.c
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up.c
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user_namespace.c
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user-return-notifier.c
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user.c
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utsname_sysctl.c
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utsname.c
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watchdog_hld.c
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watchdog.c
watchdog: Mark watchdog_hrtimer to expire in hard interrupt context
2019-08-01 20:51:20 +02:00
workqueue_internal.h
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workqueue.c
workqueue: Add RCU annotation for pwq list walk
2020-01-26 10:01:07 +01:00