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linux-rockchip/kernel
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Alexei Starovoitov 0fc3287d49 bpf: Avoid kfree_rcu() under lock in bpf_lpm_trie. 
[ Upstream commit 59f2f841179aa6a0899cb9cf53659149a35749b7 ]

syzbot reported the following lock sequence:
cpu 2:
  grabs timer_base lock
    spins on bpf_lpm lock

cpu 1:
  grab rcu krcp lock
    spins on timer_base lock

cpu 0:
  grab bpf_lpm lock
    spins on rcu krcp lock

bpf_lpm lock can be the same.
timer_base lock can also be the same due to timer migration.
but rcu krcp lock is always per-cpu, so it cannot be the same lock.
Hence it's a false positive.
To avoid lockdep complaining move kfree_rcu() after spin_unlock.

Reported-by: syzbot+1fa663a2100308ab6eab@syzkaller.appspotmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240329171439.37813-1-alexei.starovoitov@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-08-29 17:30:22 +02:00
..
bpf
bpf: Avoid kfree_rcu() under lock in bpf_lpm_trie.
2024-08-29 17:30:22 +02:00
cgroup
cgroup: Make operations on the cgroup root_list RCU safe
2024-08-19 06:00:06 +02:00
configs
…
debug
kdb: Use the passed prompt in kdb_position_cursor()
2024-08-03 08:49:47 +02:00
dma
dma: fix call order in dmam_free_coherent
2024-08-03 08:49:49 +02:00
entry
entry: Respect changes to system call number by trace_sys_enter()
2024-04-03 15:19:44 +02:00
events
bpf, events: Use prog to emit ksymbol event for main program
2024-08-03 08:49:49 +02:00
futex
futex: Don't include process MM in futex key on no-MMU
2023-11-20 11:51:50 +01:00
gcov
gcov: add support for GCC 14
2024-06-27 13:46:22 +02:00
irq
genirq/irqdesc: Honor caller provided affinity in alloc_desc()
2024-08-14 13:52:58 +02:00
kcsan
kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures
2023-07-19 16:21:37 +02:00
livepatch
livepatch: Fix missing newline character in klp_resolve_symbols()
2023-11-20 11:52:10 +01:00
locking
locking/rwsem: Add __always_inline annotation to __down_write_common() and inlined callers
2024-08-03 08:49:08 +02:00
module
modules: wait do_free_init correctly
2024-03-26 18:20:52 -04:00
power
PM: s2idle: Make sure CPUs will wakeup directly on resume
2024-04-17 11:18:22 +02:00
printk
printk: Update @console_may_schedule in console_trylock_spinning()
2024-04-03 15:19:44 +02:00
rcu
rcu: Fix rcu_barrier() VS post CPUHP_TEARDOWN_CPU invocation
2024-08-14 13:52:45 +02:00
sched
sched/smt: Fix unbalance sched_smt_present dec/inc
2024-08-14 13:53:00 +02:00
time
posix-timers: Ensure timer ID search-loop limit is valid
2024-08-29 17:30:17 +02:00
trace
tracing: Fix overflow in get_free_elt()
2024-08-14 13:52:59 +02:00
.gitignore
…
acct.c
…
async.c
async: Introduce async_schedule_dev_nocall()
2024-01-31 16:17:00 -08:00
audit_fsnotify.c
…
audit_tree.c
…
audit_watch.c
audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()
2023-11-28 17:07:08 +00:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-05 20:12:47 +00:00
audit.h
…
auditfilter.c
ima: Avoid blocking in RCU read-side critical section
2024-07-11 12:47:16 +02:00
auditsc.c
audit,io_uring: io_uring openat triggers audit reference count underflow
2023-10-25 12:03:04 +02:00
backtracetest.c
…
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-05-02 16:29:32 +02:00
capability.c
…
cfi.c
…
compat.c
…
configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
cpu/hotplug: Fix dynstate assignment in __cpuhp_setup_state_cpuslocked()
2024-07-05 09:31:56 +02:00
crash_core.c
…
crash_dump.c
…
cred.c
cred: switch to using atomic_long_t
2023-12-20 17:00:20 +01:00
delayacct.c
…
dma.c
…
exec_domain.c
…
exit.c
mm: optimize the redundant loop of mm_update_owner_next()
2024-07-11 12:47:13 +02:00
extable.c
…
fail_function.c
…
fork.c
Revert "fork: defer linking file vma until vma is fully initialized"
2024-06-21 14:35:59 +02:00
freezer.c
…
gen_kheaders.sh
kheaders: explicitly define file modes for archived headers
2024-06-27 13:46:24 +02:00
groups.c
…
hung_task.c
…
iomem.c
…
irq_work.c
…
jump_label.c
jump_label: Fix the fix, brown paper bags galore
2024-08-14 13:52:43 +02:00
kallsyms_internal.h
kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]
2023-10-25 12:03:16 +02:00
kallsyms.c
kallsyms: Add helper kallsyms_on_each_match_symbol()
2023-10-25 12:03:16 +02:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: properly check for softirq context
2024-08-14 13:52:58 +02:00
kexec_core.c
kexec: fix a memory leak in crash_shrink_memory()
2023-07-19 16:21:08 +02:00
kexec_elf.c
…
kexec_file.c
kexec: support purgatories with .text.hot sections
2023-06-21 16:00:55 +02:00
kexec_internal.h
…
kexec.c
kernel: kexec: copy user-array safely
2023-11-28 17:06:57 +00:00
kheaders.c
kheaders: Use array declaration instead of char
2023-05-11 23:03:02 +09:00
kmod.c
…
kprobes.c
kprobes: Fix to check symbol prefixes correctly
2024-08-14 13:52:54 +02:00
ksysfs.c
…
kthread.c
…
latencytop.c
…
Makefile
kernel/numa.c: Move logging out of numa.h
2024-06-12 11:03:16 +02:00
module_signature.c
…
notifier.c
…
nsproxy.c
…
numa.c
kernel/numa.c: Move logging out of numa.h
2024-06-12 11:03:16 +02:00
padata.c
padata: Fix possible divide-by-0 panic in padata_mt_helper()
2024-08-14 13:52:59 +02:00
panic.c
panic: Flush kernel log buffer at the end
2024-04-13 13:04:54 +02:00
params.c
…
pid_namespace.c
pid: Replace struct pid 1-element array with flex-array
2024-08-29 17:30:18 +02:00
pid.c
pid: Replace struct pid 1-element array with flex-array
2024-08-29 17:30:18 +02:00
profile.c
profiling: remove profile=sleep support
2024-08-14 13:52:50 +02:00
ptrace.c
…
range.c
…
reboot.c
kernel/reboot: emergency_restart: Set correct system_state
2023-11-28 17:07:13 +00:00
regset.c
…
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-11 23:03:03 +09:00
resource_kunit.c
…
resource.c
PCI: Allow drivers to request exclusive config regions
2023-09-13 09:42:46 +02:00
rseq.c
…
scftorture.c
scftorture: Forgive memory-allocation failure if KASAN
2023-09-23 11:11:00 +02:00
scs.c
…
seccomp.c
…
signal.c
kernel: rerun task_work while freezing in get_signal()
2024-08-03 08:49:31 +02:00
smp.c
smp,csd: Throw an error if a CSD lock is stuck for too long
2023-11-28 17:06:55 +00:00
smpboot.c
…
smpboot.h
…
softirq.c
softirq: Fix suspicious RCU usage in __do_softirq()
2024-06-12 11:03:01 +02:00
stackleak.c
…
stacktrace.c
…
static_call_inline.c
…
static_call.c
…
stop_machine.c
…
sys_ni.c
syscalls: fix compat_sys_io_pgetevents_time64 usage
2024-07-05 09:31:59 +02:00
sys.c
getrusage: use sig->stats_lock rather than lock_task_sighand()
2024-03-15 10:48:22 -04:00
sysctl-test.c
…
sysctl.c
…
task_work.c
task_work: Introduce task_work_cancel() again
2024-08-03 08:49:34 +02:00
taskstats.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
…
usermode_driver.c
…
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
kernel: watch_queue: copy user-array safely
2023-11-28 17:06:57 +00:00
watchdog_hld.c
watchdog/perf: properly initialize the turbo mode timestamp and rearm counter
2024-08-03 08:49:42 +02:00
watchdog.c
watchdog: move softlockup_panic back to early_param
2023-11-28 17:07:09 +00:00
workqueue_internal.h
…
workqueue.c
workqueue: Provide one lock class key per work_on_cpu() callsite
2023-11-28 17:06:55 +00:00