Puranjay Mohan 78b9778349 bpf: Send signals asynchronously if !preemptible ...

[ Upstream commit 87c544108b ]

BPF programs can execute in all kinds of contexts and when a program
running in a non-preemptible context uses the bpf_send_signal() kfunc,
it will cause issues because this kfunc can sleep.
Change `irqs_disabled()` to `!preemptible()`.

Reported-by: syzbot+97da3d7e0112d59971de@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/67486b09.050a0220.253251.0084.GAE@google.com/
Fixes: 1bc7896e9e ("bpf: Fix deadlock with rq_lock in bpf_send_signal()")
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20250115103647.38487-1-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-02-08 09:57:33 +01:00

..

bpf

bpf: Reject struct_ops registration that uses module ptr and the module btf_id is missing

2025-02-08 09:57:30 +01:00

cgroup

cgroup/cpuset: remove kernfs active break

2025-01-17 13:40:49 +01:00

configs

tinyconfig: remove unnecessary 'is not set' for choice blocks

2024-09-01 20:34:38 +09:00

debug

move asm/unaligned.h to linux/unaligned.h

2024-10-02 17:23:23 -04:00

dma

dma-debug: fix a possible deadlock on radix_lock

2024-12-14 20:03:52 +01:00

entry

treewide: context_tracking: Rename CONTEXT_* into CT_STATE_*

2024-07-29 07:33:10 +05:30

events

perf/core: Save raw sample data conditionally based on sample type

2025-02-08 09:56:53 +01:00

futex

fault-inject: improve build for CONFIG_FAULT_INJECTION=n

2024-09-01 20:43:33 -07:00

gcov

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irq

genirq: Make handle_enforce_irqctx() unconditionally available

2025-02-08 09:57:00 +01:00

kcsan

kcsan: Turn report_filterlist_lock into a raw_spinlock

2024-12-14 20:03:37 +01:00

livepatch

livepatch: Replace snprintf() with sysfs_emit()

2024-07-02 16:56:18 +02:00

locking

Merge tag 'locking-urgent-2024-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2024-09-29 08:51:30 -07:00

module

Merge tag 'modules-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux

2024-09-28 09:06:15 -07:00

power

[tree-wide] finally take no_llseek out

2024-09-27 08:18:43 -07:00

printk

printk: Defer legacy printing when holding printk_cpu_sync

2025-02-08 09:56:57 +01:00

rcu

rcuscale: Do a proper cleanup if kfree_scale_init() fails

2024-12-05 14:01:21 +01:00

sched

cpufreq: schedutil: Fix superfluous updates caused by need_freq_update

2025-02-08 09:57:06 +01:00

time

timers/migration: Enforce group initialization visibility to tree walkers

2025-01-23 17:23:03 +01:00

trace

bpf: Send signals asynchronously if !preemptible

2025-02-08 09:57:33 +01:00

.gitignore

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acct.c

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async.c

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audit_fsnotify.c

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audit_tree.c

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audit_watch.c

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audit.c

audit: Make use of str_enabled_disabled() helper

2024-09-03 16:35:16 -04:00

audit.h

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auditfilter.c

audit: use task_tgid_nr() instead of task_pid_nr()

2024-08-28 16:48:28 -04:00

auditsc.c

audit: use task_tgid_nr() instead of task_pid_nr()

2024-08-28 16:48:28 -04:00

backtracetest.c

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bounds.c

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capability.c

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cfi.c

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compat.c

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configs.c

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context_tracking.c

context_tracking, rcu: Rename rcu_dyntick trace event into rcu_watching

2024-08-15 21:30:43 +05:30

cpu_pm.c

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cpu.c

hrtimers: Handle CPU state correctly on hotplug

2025-01-23 17:23:03 +01:00

crash_core.c

Document/kexec: generalize crash hotplug description

2024-09-01 20:43:37 -07:00

crash_reserve.c

crash: fix crash memory reserve exceed system memory bug

2024-09-01 20:43:30 -07:00

cred.c

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delayacct.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

dma.c

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elfcorehdr.c

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exec_domain.c

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exit.c

Merge tag 'mm-stable-2024-09-20-02-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-09-21 07:29:05 -07:00

exit.h

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extable.c

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fail_function.c

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fork.c

fork: avoid inappropriate uprobe access to invalid mm

2025-01-02 10:34:10 +01:00

freezer.c

sched/fair: Fix external p->on_rq users

2024-10-14 09:14:35 +02:00

gen_kheaders.sh

kheaders: Ignore silly-rename files

2025-01-23 17:22:55 +01:00

groups.c

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hung_task.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

iomem.c

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irq_work.c

…

jump_label.c

jump_label: Fix static_key_slow_dec() yet again

2024-09-10 11:57:27 +02:00

kallsyms_internal.h

kallsyms: get rid of code for absolute kallsyms

2024-07-20 16:33:21 +09:00

kallsyms_selftest.c

kallsyms: Match symbols exactly with CONFIG_LTO_CLANG

2024-08-15 09:33:35 -07:00

kallsyms_selftest.h

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kallsyms.c

kallsyms: Match symbols exactly with CONFIG_LTO_CLANG

2024-08-15 09:33:35 -07:00

kcmp.c

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Kconfig.freezer

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Kconfig.hz

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Kconfig.kexec

crash, powerpc: default to CRASH_DUMP=n on PPC_BOOK3S_32

2024-11-14 22:43:48 -08:00

Kconfig.locks

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Kconfig.preempt

sched_ext: Build fix on !CONFIG_STACKTRACE[_SUPPORT]

2024-08-01 07:08:01 -10:00

kcov.c

kcov: mark in_softirq_really() as __always_inline

2025-01-09 13:33:49 +01:00

kexec_core.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

kexec_elf.c

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kexec_file.c

kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y

2024-09-01 17:59:01 -07:00

kexec_internal.h

kexec: use atomic_try_cmpxchg_acquire() in kexec_trylock()

2024-09-01 20:43:23 -07:00

kexec.c

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kheaders.c

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kprobes.c

kprobes: Fix to check symbol prefixes correctly

2024-08-05 14:04:03 +09:00

ksyms_common.c

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ksysfs.c

profiling: remove prof_cpu_mask

2024-07-29 10:45:54 -07:00

kthread.c

kthread: unpark only parked kthread

2024-10-09 12:47:19 -07:00

latencytop.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

Makefile

mm: move kernel/numa.c to mm/

2024-09-03 21:15:26 -07:00

module_signature.c

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notifier.c

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nsproxy.c

introduce fd_file(), convert all accessors to it.

2024-08-12 22:00:43 -04:00

padata.c

padata: fix sysfs store callback check

2025-02-08 09:57:30 +01:00

panic.c

Merge tag 'drm-next-2024-09-19' of https://gitlab.freedesktop.org/drm/kernel

2024-09-19 10:18:15 +02:00

params.c

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pid_namespace.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

pid_sysctl.h

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

pid.c

introduce fd_file(), convert all accessors to it.

2024-08-12 22:00:43 -04:00

profile.c

profiling: remove profile=sleep support

2024-08-04 13:36:28 -07:00

ptrace.c

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range.c

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reboot.c

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regset.c

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relay.c

[tree-wide] finally take no_llseek out

2024-09-27 08:18:43 -07:00

resource_kunit.c

resource, kunit: fix user-after-free in resource_test_region_intersects()

2024-10-09 12:47:19 -07:00

resource.c

resource,kexec: walk_system_ram_res_rev must retain resource flags

2024-10-28 21:40:40 -07:00

rseq.c

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scftorture.c

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scs.c

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seccomp.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

signal.c

posix-timers: Target group sigqueue to current task only if not exiting

2024-12-09 10:41:16 +01:00

smp.c

smp: print only local CPU info when sched_clock goes backward

2024-08-15 00:06:48 +05:30

smpboot.c

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smpboot.h

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softirq.c

softirq: Allow raising SCHED_SOFTIRQ from SMP-call-function on RT kernel

2024-12-14 20:04:16 +01:00

stackleak.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

stacktrace.c

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static_call_inline.c

x86/static-call: provide a way to do very early static-call updates

2024-12-19 18:13:23 +01:00

static_call.c

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stop_machine.c

rcu: Rename rcu_momentary_dyntick_idle() into rcu_momentary_eqs()

2024-08-15 21:30:42 +05:30

sys_ni.c

Merge tag 'probes-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

2024-07-18 12:19:20 -07:00

sys.c

Merge tag 'pull-stable-struct_fd' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2024-09-23 09:35:36 -07:00

sysctl-test.c

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sysctl.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

task_work.c

sched/core: Disable page allocation in task_tick_mm_cid()

2024-10-11 10:49:32 +02:00

taskstats.c

introduce fd_file(), convert all accessors to it.

2024-08-12 22:00:43 -04:00

torture.c

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tracepoint.c

tracepoint: Support iterating tracepoints in a loading module

2024-09-25 23:23:44 +09:00

tsacct.c

tsacct: replace strncpy() with strscpy()

2024-07-12 16:39:53 -07:00

ucount.c

signal: restore the override_rlimit logic

2024-11-07 14:14:59 -08:00

uid16.c

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uid16.h

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umh.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

up.c

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user_namespace.c

user_namespace: use kmemdup_array() instead of kmemdup() for multiple allocation

2024-09-09 16:47:42 -07:00

user-return-notifier.c

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user.c

uidgid: make sure we fit into one cacheline

2024-09-12 12:16:09 +02:00

usermode_driver.c

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utsname_sysctl.c

sysctl: treewide: constify the ctl_table argument of proc_handlers

2024-07-24 20:59:29 +02:00

utsname.c

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vhost_task.c

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vmcore_info.c

mm: support only one page_type per page

2024-09-03 21:15:43 -07:00

watch_queue.c

introduce fd_file(), convert all accessors to it.

2024-08-12 22:00:43 -04:00

watchdog_buddy.c

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watchdog_perf.c

watchdog/perf: properly initialize the turbo mode timestamp and rearm counter

2024-07-17 21:11:34 -07:00

watchdog.c

watchdog: handle the ENODEV failure case of lockup_detector_delay_init() separately

2024-09-01 20:43:32 -07:00

workqueue_internal.h

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workqueue.c

workqueue: Do not warn when cancelling WQ_MEM_RECLAIM work from !WQ_MEM_RECLAIM worker

2025-01-09 13:33:50 +01:00