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46307fd6e27a3f678a1678b02e667678c22aa8cc
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Michal Koutný 46307fd6e2 cgroup: Reorganize css_set_lock and kernfs path processing 
The commit 74e4b956eb incorrectly wrapped kernfs_walk_and_get
(might_sleep) under css_set_lock (spinlock). css_set_lock is needed by
__cset_cgroup_from_root to ensure stable cset->cgrp_links but not for
kernfs_walk_and_get.

We only need to make sure that the returned root_cgrp won't be freed
under us. This is given in the case of global root because it is static
(cgrp_dfl_root.cgrp). When the root_cgrp is lower in the hierarchy, it
is pinned by cgroup_ns->root_cset (and `current` task cannot switch
namespace asynchronously so ns_proxy pins cgroup_ns).

Note this reasoning won't hold for root cgroups in v1 hierarchies,
therefore create a special-cased helper function just for the default
hierarchy.

Fixes: 74e4b956eb ("cgroup: Honor caller's cgroup NS when resolving path")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2022-10-10 10:23:18 -10:00
..
bpf
Merge tag 'perf-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:27:46 -07:00
cgroup
cgroup: Reorganize css_set_lock and kernfs path processing
2022-10-10 10:23:18 -10:00
configs
Kbuild: add Rust support
2022-09-28 09:02:20 +02:00
debug
Merge tag 'modules-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux
2022-05-26 17:13:43 -07:00
dma
dma-mapping: mark dma_supported static
2022-09-07 10:38:28 +02:00
entry
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
events
Merge tag 'perf-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:27:46 -07:00
futex
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
gcov
gcov: Remove compiler version check
2021-12-02 17:25:21 +09:00
irq
Merge tag 'irqchip-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core
2022-07-28 12:36:35 +02:00
kcsan
kcsan: test: Add a .kunitconfig to run KCSAN tests
2022-07-22 09:22:59 -06:00
livepatch
Merge tag 'livepatching-for-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
2022-10-10 11:36:19 -07:00
locking
Merge tag 'locking-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:44:12 -07:00
module
Merge tag 'driver-core-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
2022-10-07 17:04:10 -07:00
power
Merge tag 'sched-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:10:28 -07:00
printk
printk: Mark __printk percpu data ready __ro_after_init
2022-09-29 15:20:52 +02:00
rcu
Merge branches 'doc.2022.08.31b', 'fixes.2022.08.31b', 'kvfree.2022.08.31b', 'nocb.2022.09.01a', 'poll.2022.08.31b', 'poll-srcu.2022.08.31b' and 'tasks.2022.08.31b' into HEAD
2022-09-01 10:55:57 -07:00
sched
Merge tag 'sched-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:10:28 -07:00
time
Merge tag 'sched-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:10:28 -07:00
trace
Merge tag 'perf-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:27:46 -07:00
.gitignore
…
acct.c
kernel/acct: move acct sysctls to its own file
2022-04-06 13:43:44 -07:00
async.c
Revert "module, async: async_synchronize_full() on module init iff async is used"
2022-02-03 11:20:34 -08:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-22 18:50:06 -04:00
audit_tree.c
audit: use fsnotify group lock helpers
2022-04-25 14:37:28 +02:00
audit_watch.c
audit_init_parent(): constify path
2022-09-01 17:39:30 -04:00
audit.c
audit: use time_after to compare time
2022-08-29 19:47:03 -04:00
audit.h
audit: remove selinux_audit_rule_update() declaration
2022-09-07 11:30:15 -04:00
auditfilter.c
Merge tag 'audit-pr-20220110' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2022-01-11 13:08:21 -08:00
auditsc.c
Merge tag 'audit-pr-20221003' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2022-10-04 11:05:43 -07:00
backtracetest.c
…
bounds.c
…
capability.c
xfs: don't generate selinux audit messages for capability testing
2022-03-09 10:32:06 -08:00
cfi.c
cfi: Switch to -fsanitize=kcfi
2022-09-26 10:13:13 -07:00
compat.c
…
configs.c
…
context_tracking.c
MAINTAINERS: Add Paul as context tracking maintainer
2022-07-05 13:33:00 -07:00
cpu_pm.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
cpu.c
Merge tag 'x86_tdx_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-05-23 17:51:12 -07:00
crash_core.c
vmcoreinfo: add kallsyms_num_syms symbol
2022-08-28 14:02:44 -07:00
crash_dump.c
…
cred.c
x86: Mark __invalid_creds() __noreturn
2022-03-15 10:32:44 +01:00
delayacct.c
delayacct: track delays from write-protect copy
2022-06-01 15:55:25 -07:00
dma.c
…
exec_domain.c
…
exit.c
Merge tag 'sched-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:10:28 -07:00
extable.c
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
fail_function.c
…
fork.c
Merge tag 'sched-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:10:28 -07:00
freezer.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
gen_kheaders.sh
kheaders: Have cpio unconditionally replace files
2022-05-08 03:16:59 +09:00
groups.c
security: Add LSM hook to setgroups() syscall
2022-07-15 18:21:49 +00:00
hung_task.c
sched: Fix more TASK_state comparisons
2022-09-30 16:50:39 +02:00
iomem.c
…
irq_work.c
irq_work: use kasan_record_aux_stack_noalloc() record callstack
2022-04-15 14:49:55 -07:00
jump_label.c
jump_label: make initial NOP patching the special case
2022-06-24 09:48:55 +02:00
kallsyms_internal.h
kallsyms: move declarations to internal header
2022-07-17 17:31:39 -07:00
kallsyms.c
Merge tag 'kcfi-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2022-10-03 17:11:07 -07:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"
2022-03-31 10:36:55 +02:00
kcov.c
kcov: update pos before writing pc in trace function
2022-05-25 13:05:42 -07:00
kexec_core.c
kexec: drop weak attribute from functions
2022-07-15 12:21:16 -04:00
kexec_elf.c
…
kexec_file.c
Merge tag 'mm-nonmm-stable-2022-08-06-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2022-08-07 10:03:24 -07:00
kexec_internal.h
…
kexec.c
…
kheaders.c
…
kmod.c
…
kprobes.c
Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2022-10-03 13:02:49 -07:00
ksysfs.c
kernel/ksysfs.c: use helper macro __ATTR_RW
2022-03-23 19:00:33 -07:00
kthread.c
Merge tag 'interrupting_kthread_stop-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-10-09 16:01:59 -07:00
latencytop.c
latencytop: move sysctl to its own file
2022-04-21 11:40:59 -07:00
Makefile
kernel: remove platform_has() infrastructure
2022-08-01 07:42:56 +02:00
module_signature.c
…
notifier.c
notifier: Add blocking/atomic_notifier_chain_register_unique_prio()
2022-05-19 19:30:30 +02:00
nsproxy.c
Revert "fs/exec: allow to unshare a time namespace on vfork+exec"
2022-09-13 10:38:43 -07:00
padata.c
padata: replace cpumask_weight with cpumask_empty in padata.c
2022-01-31 11:21:46 +11:00
panic.c
kernel/panic: Drop unblank_screen call
2022-09-01 16:55:35 +02:00
params.c
kobject: remove kset from struct kset_uevent_ops callbacks
2021-12-28 11:26:18 +01:00
pid_namespace.c
kernel: pid_namespace: use NULL instead of using plain integer as pointer
2022-04-29 14:38:00 -07:00
pid.c
pid: add pidfd_get_task() helper
2021-10-14 13:29:18 +02:00
profile.c
profile: setup_profiling_timer() is moslty not implemented
2022-07-29 18:12:36 -07:00
ptrace.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
range.c
…
reboot.c
Merge branch 'rework/kthreads' into for-linus
2022-06-23 19:11:28 +02:00
regset.c
…
relay.c
relay: remove redundant assignment to pointer buf
2022-05-12 20:38:37 -07:00
resource_kunit.c
…
resource.c
resource: Introduce alloc_free_mem_region()
2022-07-21 17:19:25 -07:00
rseq.c
rseq: Kill process when unknown flags are encountered in ABI structures
2022-08-01 15:21:42 +02:00
scftorture.c
scftorture: Fix distribution of short handler delays
2022-04-11 17:07:29 -07:00
scs.c
kasan, vmalloc: only tag normal vmalloc allocations
2022-03-24 19:06:48 -07:00
seccomp.c
seccomp: Add wait_killable semantic to seccomp user notifier
2022-05-03 14:11:58 -07:00
signal.c
Merge tag 'sched-core-2022-10-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-10-10 09:10:28 -07:00
smp.c
sched/debug: Try trigger_single_cpu_backtrace(cpu) in dump_cpu_task()
2022-08-31 05:03:14 -07:00
smpboot.c
cpu/hotplug: Allow the CPU in CPU_UP_PREPARE state to be brought up again.
2022-04-12 14:13:01 +02:00
smpboot.h
…
softirq.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
stackleak.c
stackleak: add on/off stack variants
2022-05-08 01:33:09 -07:00
stacktrace.c
uaccess: remove CONFIG_SET_FS
2022-02-25 09:36:06 +01:00
static_call_inline.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
static_call.c
static_call: Don't make __static_call_return0 static
2022-04-05 09:59:38 +02:00
stop_machine.c
Merge tag 'sched-core-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-05-24 11:11:13 -07:00
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-08-20 15:17:45 -07:00
sys.c
Merge tag 'random-6.1-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random
2022-10-10 10:41:21 -07:00
sysctl-test.c
…
sysctl.c
kernel/sysctl.c: Remove trailing white space
2022-08-08 09:01:36 -07:00
task_work.c
task_work: allow TWA_SIGNAL without a rescheduling IPI
2022-04-30 08:39:32 -06:00
taskstats.c
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
torture.c
torture: Wake up kthreads after storing task_struct pointer
2022-02-01 17:24:39 -08:00
tracepoint.c
tracepoint: Allow trace events in modules with TAINT_TEST
2022-09-06 22:26:00 -04:00
tsacct.c
taskstats: version 12 with thread group and exe info
2022-04-29 14:38:03 -07:00
ucount.c
ucounts: Split rlimit and ucount values and max values
2022-05-18 18:24:57 -05:00
uid16.c
…
uid16.h
…
umh.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
up.c
…
user_namespace.c
Merge tag 'ucount-rlimits-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-10-09 16:24:05 -07:00
user-return-notifier.c
…
user.c
…
usermode_driver.c
blob_to_mnt(): kern_unmount() is needed to undo kern_mount()
2022-05-19 23:25:47 -04:00
utsname_sysctl.c
utsname: contribute changes to RNG
2022-09-29 21:37:27 +02:00
utsname.c
…
watch_queue.c
Merge tag 'docs-6.0' of git://git.lwn.net/linux
2022-08-02 19:24:24 -07:00
watchdog_hld.c
Revert "printk: add functions to prefer direct printing"
2022-06-23 18:41:40 +02:00
watchdog.c
Merge tag 'powerpc-6.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2022-08-06 16:38:17 -07:00
workqueue_internal.h
…
workqueue.c
Merge tag 'kcfi-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2022-10-03 17:11:07 -07:00