Roman Gushchin 4e4d5cea79 cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock ...

[ Upstream commit 4dcabece4c ]

The number of descendant cgroups and the number of dying
descendant cgroups are currently synchronized using the cgroup_mutex.

The number of descendant cgroups will be required by the cgroup v2
freezer, which will use it to determine if a cgroup is frozen
(depending on total number of descendants and number of frozen
descendants). It's not always acceptable to grab the cgroup_mutex,
especially from quite hot paths (e.g. exit()).

To avoid this, let's additionally synchronize these counters using
the css_set_lock.

So, it's safe to read these counters with either cgroup_mutex or
css_set_lock locked, and for changing both locks should be acquired.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: kernel-team@fb.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2019-05-31 06:46:19 -07:00

..

bpf

bpf: devmap: fix use-after-free Read in __dev_map_entry_free

2019-05-31 06:46:04 -07:00

cgroup

cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock

2019-05-31 06:46:19 -07:00

configs

kconfig: tinyconfig: remove stale stack protector fixups

2018-06-15 07:15:28 +09:00

debug

kdb: Don't back trace on a cpu that didn't round up

2019-02-12 19:47:19 +01:00

dma

dma-direct: do not include SME mask in the DMA supported check

2019-01-13 09:51:05 +01:00

events

perf/core: Fix perf_event_disable_inatomic() race

2019-05-10 17:54:09 +02:00

gcov

gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT

2018-06-08 18:56:02 +09:00

irq

genirq: Prevent use-after-free and work list corruption

2019-05-10 17:54:10 +02:00

livepatch

Merge branch 'for-4.19/upstream' into for-linus

2018-08-20 18:33:50 +02:00

locking

locking/rwsem: Prevent decrement of reader count before increment

2019-05-22 07:37:34 +02:00

power

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

2018-10-12 12:35:02 +02:00

printk

printk: Fix panic caused by passing log_buf_len to command line

2018-11-13 11:08:48 -08:00

rcu

kprobes: Prohibit probing on RCU debug routine

2019-04-05 22:33:08 +02:00

sched

sched/nohz: Run NOHZ idle load balancer on HK_FLAG_MISC CPUs

2019-05-31 06:46:14 -07:00

time

timers/sched_clock: Prevent generic sched_clock wrap caused by tick_freeze()

2019-04-27 09:36:38 +02:00

trace

tracing: Fix partial reading of trace event's id file

2019-05-25 18:23:32 +02:00

.gitignore

…

acct.c

acct_on(): don't mess with freeze protection

2019-05-31 06:46:05 -07:00

async.c

kernel/async.c: revert "async: simplify lowest_in_progress()"

2018-02-06 18:32:44 -08:00

audit_fsnotify.c

fsnotify: add fsnotify_add_inode_mark() wrappers

2018-05-18 14:58:22 +02:00

audit_tree.c

Merge tag 'fsnotify_for_v4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

2018-08-17 09:41:28 -07:00

audit_watch.c

audit: fix use-after-free in audit_add_watch

2018-07-18 11:43:36 -04:00

audit.c

audit: use ktime_get_coarse_real_ts64() for timestamps

2018-07-17 14:45:08 -04:00

audit.h

audit: track the owner of the command mutex ourselves

2018-02-23 11:22:22 -05:00

auditfilter.c

audit: fix a memory leak bug

2019-05-31 06:46:17 -07:00

auditsc.c

Merge tag 'audit-pr-20180814' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit

2018-08-15 10:46:54 -07:00

backtracetest.c

…

bounds.c

kbuild: fix kernel/bounds.c 'W=1' warning

2018-11-13 11:08:47 -08:00

capability.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

compat.c

time: Enable get/put_compat_itimerspec64 always

2018-06-24 14:39:47 +02:00

configs.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

context_tracking.c

…

cpu_pm.c

PM / CPU: replace raw_notifier with atomic_notifier

2017-07-31 13:09:49 +02:00

cpu.c

cpu/speculation: Add 'mitigations=' cmdline option

2019-05-14 19:17:59 +02:00

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

doc: ReSTify credentials.txt

2017-05-18 10:30:19 -06:00

delayacct.c

delayacct: Use raw_spinlocks

2018-04-27 14:34:51 +02:00

dma.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

elfcore.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

exec_domain.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

exit.c

cgroup/pids: turn cgroup_subsys->free() into cgroup_subsys->release() to fix the accounting

2019-04-05 22:33:13 +02:00

extable.c

extable: Make init_kernel_text() global

2018-02-21 16:54:06 +01:00

fail_function.c

bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe

2018-06-21 12:33:19 +02:00

fork.c

userfaultfd: use RCU to free the task struct when fork fails

2019-05-22 07:37:41 +02:00

freezer.c

PM / reboot: Eliminate race between reboot and suspend

2018-08-06 12:35:20 +02:00

futex_compat.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

futex.c

locking/futex: Allow low-level atomic operations to return -EAGAIN

2019-05-10 17:54:11 +02:00

groups.c

kernel: make groups_sort calling a responsibility group_info allocators

2017-12-14 16:00:49 -08:00

hung_task.c

kernel: hung_task.c: disable on suspend

2019-04-20 09:16:02 +02:00

iomem.c

memremap: split devm_memremap_pages() and memremap() infrastructure

2018-05-15 23:08:33 -07:00

irq_work.c

irq/work: Improve the flag definitions

2018-01-08 19:43:15 +01:00

jump_label.c

jump_label: Fix typo in warning message

2018-09-10 10:15:48 +02:00

kallsyms.c

kallsyms, x86: Export addresses of PTI entry trampolines

2018-08-14 19:12:29 -03:00

kcmp.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

…

Kconfig.preempt

kconfig: include kernel/Kconfig.preempt from init/Kconfig

2018-08-02 08:06:54 +09:00

kcov.c

kernel/kcov.c: mark write_comp_data() as notrace

2019-02-12 19:47:20 +01:00

kexec_core.c

kexec: yield to scheduler when loading kimage segments

2018-06-15 07:55:24 +09:00

kexec_file.c

treewide: Use array_size() in vzalloc()

2018-06-12 16:19:22 -07:00

kexec_internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

kexec.c

kexec: add call to LSM hook in original kexec_load syscall

2018-07-16 12:31:57 -07:00

kmod.c

kmod: move #ifdef CONFIG_MODULES wrapper to Makefile

2017-09-08 18:26:51 -07:00

kprobes.c

kprobes: Fix error check when reusing optimized probes

2019-04-27 09:36:37 +02:00

ksysfs.c

kexec: move vmcoreinfo out of the kernel's .bss section

2017-07-12 16:25:59 -07:00

kthread.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

latencytop.c

sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>

2017-03-02 08:42:39 +01:00

Makefile

kbuild: move bin2c back to scripts/ from scripts/basic/

2018-07-18 01:18:05 +09:00

memremap.c

mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support

2019-01-13 09:51:04 +01:00

module_signing.c

modsign: log module name in the event of an error

2018-07-02 11:36:17 +02:00

module-internal.h

modsign: log module name in the event of an error

2018-07-02 11:36:17 +02:00

module.c

x86/modules: Avoid breaking W^X while loading modules

2019-05-31 06:46:12 -07:00

notifier.c

kernel/notifier.c: simplify expression

2017-02-24 17:46:56 -08:00

nsproxy.c

perf: Add PERF_RECORD_NAMESPACES to include namespaces related info

2017-03-13 15:57:41 -03:00

padata.c

padata: add SPDX identifier

2018-01-05 18:43:00 +11:00

panic.c

panic: avoid deadlocks in re-entrant console drivers

2018-12-29 13:37:57 +01:00

params.c

kernel/params.c: downgrade warning for unsafe parameters

2018-04-11 10:28:37 -07:00

pid_namespace.c

Merge branch 'userns-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2018-04-03 19:15:32 -07:00

pid.c

Fix failure path in alloc_pid()

2019-01-13 09:51:06 +01:00

profile.c

sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>

2017-03-02 08:42:39 +01:00

ptrace.c

ptrace: take into account saved_sigmask in PTRACE{GET,SET}SIGMASK

2019-05-04 09:20:22 +02:00

range.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

reboot.c

PM / reboot: Eliminate race between reboot and suspend

2018-08-06 12:35:20 +02:00

relay.c

relay: check return of create_buf_file() properly

2019-03-13 14:02:35 -07:00

resource.c

Merge tag 'libnvdimm-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

2018-06-08 17:21:52 -07:00

rseq.c

rseq: uapi: Declare rseq_cs field as union, update includes

2018-07-10 22:18:52 +02:00

seccomp.c

Merge tag 'audit-pr-20180605' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit

2018-06-06 16:34:00 -07:00

signal.c

signal: Restore the stop PTRACE_EVENT_EXIT

2019-02-20 10:25:48 +01:00

smp.c

cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM

2019-02-12 19:47:25 +01:00

smpboot.c

smpboot: Remove cpumask from the API

2018-07-03 09:20:44 +02:00

smpboot.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

softirq.c

nohz: Fix missing tick reprogram when interrupting an inline softirq

2018-08-03 15:52:10 +02:00

stacktrace.c

stacktrace/x86: add function for detecting reliable stack traces

2017-03-08 09:18:02 +01:00

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

Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2018-06-10 10:17:09 -07:00

sys.c

kernel/sys.c: remove duplicated include

2018-09-20 22:01:11 +02:00

sysctl_binary.c

staging: irda: remove remaining remants of irda code removal

2018-04-16 11:26:49 +02:00

sysctl.c

kernel/sysctl.c: fix out-of-bounds access when setting file-max

2019-04-27 09:36:41 +02:00

task_work.c

locking/barriers: Convert users of lockless_dereference() to READ_ONCE()

2017-12-17 13:57:15 +01:00

taskstats.c

pids: introduce find_get_task_by_vpid() helper

2018-02-06 18:32:46 -08:00

test_kprobes.c

kprobes: Remove jprobe API implementation

2018-06-21 12:33:05 +02:00

torture.c

torture: Keep old-school dmesg format

2018-06-25 11:30:10 -07:00

tracepoint.c

tracepoint: Fix tracepoint array element size mismatch

2018-10-17 15:35:29 -04:00

tsacct.c

sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>

2017-03-02 08:42:39 +01:00

ucount.c

headers: untangle kmemleak.h from mm.h

2018-04-05 21:36:27 -07:00

uid16.c

fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers

2018-04-02 20:15:59 +02:00

uid16.h

kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c

2018-04-02 20:15:30 +02:00

umh.c

umh: fix race condition

2018-06-07 16:56:28 -04:00

up.c

smp: Avoid using two cache lines for struct call_single_data

2017-08-29 15:14:38 +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

uts: create "struct uts_namespace" from kmem_cache

2018-04-11 10:28:35 -07:00

watchdog_hld.c

watchdog: Mark watchdog touch functions as notrace

2018-08-30 12:56:40 +02:00

watchdog.c

watchdog: Respect watchdog cpumask on CPU hotplug

2019-04-03 06:26:29 +02:00

workqueue_internal.h

workqueue: Set worker->desc to workqueue name by default

2018-05-18 08:47:13 -07:00

workqueue.c

workqueue: Try to catch flush_work() without INIT_WORK().

2019-05-02 09:58:56 +02:00