Aaron Tomlin e69a66147d module: kallsyms: Ensure preemption in add_kallsyms() with PREEMPT_RT ...

The commit 08126db5ff ("module: kallsyms: Fix suspicious rcu usage")
under PREEMPT_RT=y, disabling preemption introduced an unbounded
latency since the loop is not fixed. This change caused a regression
since previously preemption was not disabled and we would dereference
RCU-protected pointers explicitly. That being said, these pointers
cannot change.

Before kallsyms-specific data is prepared/or set-up, we ensure that
the unformed module is known to be unique i.e. does not already exist
(see load_module()). Therefore, we can fix this by using the common and
more appropriate RCU flavour as this section of code can be safely
preempted.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Fixes: 08126db5ff ("module: kallsyms: Fix suspicious rcu usage")
Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

2022-07-11 10:19:09 -07:00

..

bpf

bpf: Limit maximum modifier chain length in btf_check_type_tags

2022-06-15 19:32:12 +02:00

cgroup

Merge branch 'for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2022-05-25 11:47:25 -07:00

configs

x86/configs: Add x86 debugging Kconfig fragment plus docs

2022-04-06 19:56:29 +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-direct: use the correct size for dma_set_encrypted()

2022-06-23 15:26:59 +02:00

entry

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2022-06-08 09:16:31 -07:00

events

Merge tag 'perf-urgent-2022-06-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-06-05 10:40:31 -07:00

futex

Merge tag 'drm-next-2022-05-25' of git://anongit.freedesktop.org/drm/drm

2022-05-25 16:18:27 -07:00

gcov

gcov: Remove compiler version check

2021-12-02 17:25:21 +09:00

irq

genirq: PM: Use runtime PM for chained interrupts

2022-06-09 15:58:13 +01:00

kcsan

Merge tag 'linux-kselftest-kunit-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

2022-05-25 11:32:53 -07:00

livepatch

Merge tag 'livepatching-for-5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

2022-06-02 08:55:01 -07:00

locking

locking/lockdep: Use sched_clock() for random numbers

2022-06-13 10:29:57 +02:00

module

module: kallsyms: Ensure preemption in add_kallsyms() with PREEMPT_RT

2022-07-11 10:19:09 -07:00

power

PM: hibernate: Use kernel_can_power_off()

2022-06-21 20:57:30 +02:00

printk

Revert "printk: add functions to prefer direct printing"

2022-06-23 18:41:40 +02:00

rcu

Merge branch 'rework/kthreads' into for-linus

2022-06-23 19:11:28 +02:00

sched

sched: Fix balance_push() vs __sched_setscheduler()

2022-06-13 10:15:07 +02:00

time

tick/nohz: unexport __init-annotated tick_nohz_full_setup()

2022-06-27 10:43:12 -07:00

trace

Merge tag 'block-5.19-2022-06-24' of git://git.kernel.dk/linux-block

2022-06-24 11:07:54 -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

fsnotify: make allow_dups a property of the group

2022-04-25 14:37:18 +02:00

audit_tree.c

audit: use fsnotify group lock helpers

2022-04-25 14:37:28 +02:00

audit_watch.c

fsnotify: pass flags argument to fsnotify_alloc_group()

2022-04-25 14:37:12 +02:00

audit.c

audit: improve audit queue handling when "audit=1" on cmdline

2022-01-25 13:22:51 -05:00

audit.h

audit: log AUDIT_TIME_* records only from rules

2022-02-22 13:51:40 -05:00

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

audit: free module name

2022-06-15 19:28:44 -04:00

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: Fix __cfi_slowpath_diag RCU usage with cpuidle

2022-06-13 09:18:46 -07:00

compat.c

arch: remove compat_alloc_user_space

2021-09-08 15:32:35 -07:00

configs.c

…

context_tracking.c

…

cpu_pm.c

PM: cpu: Make notifier chain use a raw_spinlock_t

2021-08-16 18:55:32 +02:00

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

Merge tag 'mm-nonmm-stable-2022-05-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-05-27 11:22:03 -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 'ptrace-cleanups-for-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-03-28 17:29:53 -07:00

extable.c

lkdtm: Really write into kernel text in WRITE_KERN

2022-02-16 23:25:12 +11:00

fail_function.c

…

fork.c

Merge tag 'kthread-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-06-03 16:03:05 -07:00

freezer.c

…

gen_kheaders.sh

kheaders: Have cpio unconditionally replace files

2022-05-08 03:16:59 +09:00

groups.c

…

hung_task.c

Merge branch 'rework/kthreads' into for-linus

2022-06-23 19:11:28 +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

…

kallsyms.c

ftrace: Add ftrace_lookup_symbols function

2022-05-10 14:42:06 -07:00

kcmp.c

…

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

locking/rwlock: Provide RT variant

2021-08-17 17:50:51 +02:00

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

Merge tag 'mm-nonmm-stable-2022-05-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-05-27 11:22:03 -07:00

kexec_elf.c

…

kexec_file.c

Merge tag 'riscv-for-linus-5.19-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

2022-05-31 14:10:54 -07:00

kexec_internal.h

…

kexec.c

kexec: avoid compat_alloc_user_space

2021-09-08 15:32:34 -07:00

kheaders.c

…

kmod.c

…

kprobes.c

Merge tag 'trace-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2022-05-29 10:31:36 -07:00

ksysfs.c

kernel/ksysfs.c: use helper macro __ATTR_RW

2022-03-23 19:00:33 -07:00

kthread.c

kthread: make it clear that kthread_create_on_node() might be terminated by any fatal signal

2022-06-16 19:11:30 -07:00

latencytop.c

latencytop: move sysctl to its own file

2022-04-21 11:40:59 -07:00

Makefile

kernel: add platform_has() infrastructure

2022-06-06 08:06:00 +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

memcg: enable accounting for new namesapces and struct nsproxy

2021-09-03 09:58:12 -07:00

padata.c

padata: replace cpumask_weight with cpumask_empty in padata.c

2022-01-31 11:21:46 +11:00

panic.c

Merge branch 'rework/kthreads' into for-linus

2022-06-23 19:11:28 +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

platform-feature.c

kernel: add platform_has() infrastructure

2022-06-06 08:06:00 +02:00

profile.c

exit: Remove profile_handoff_task

2022-01-08 12:43:57 -06:00

ptrace.c

Merge tag 'ptrace_stop-cleanup-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-06-03 16:13:25 -07:00

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

kernel/resource: fix kfree() of bootmem memory again

2022-03-23 19:00:35 -07:00

rseq.c

rseq: Remove broken uapi field layout on 32-bit little endian

2022-02-02 13:11:34 +01:00

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 'ptrace_stop-cleanup-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-06-03 16:13:25 -07:00

smp.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

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

smp: Make softirq handling RT safe in flush_smp_call_function_queue()

2022-05-01 10:03:43 +02:00

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

mm/mempolicy: wire up syscall set_mempolicy_home_node

2022-01-15 16:30:30 +02:00

sys.c

arm64/sme: Implement vector length configuration prctl()s

2022-04-22 18:50:54 +01:00

sysctl-test.c

…

sysctl.c

Merge tag 'sysctl-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux

2022-05-26 16:57:20 -07:00

task_work.c

task_work: allow TWA_SIGNAL without a rescheduling IPI

2022-04-30 08:39:32 -06:00

taskstats.c

kernel: make taskstats available from all net namespaces

2022-04-29 14:38:03 -07:00

torture.c

torture: Wake up kthreads after storing task_struct pointer

2022-02-01 17:24:39 -08:00

tracepoint.c

tracepoint: Fix kerneldoc comments

2021-08-16 11:39:51 -04:00

tsacct.c

taskstats: version 12 with thread group and exe info

2022-04-29 14:38:03 -07:00

ucount.c

ucounts: Handle wrapping in is_ucounts_overlimit

2022-02-17 09:11:57 -06:00

uid16.c

…

uid16.h

…

umh.c

kthread: Don't allocate kthread_struct for init and umh

2022-05-06 14:49:44 -05:00

up.c

…

user_namespace.c

ucounts: Fix systemd LimitNPROC with private users regression

2022-02-25 10:40:14 -06:00

user-return-notifier.c

…

user.c

fs/epoll: use a per-cpu counter for user's watches count

2021-09-08 11:50:27 -07:00

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.c

…

watch_queue.c

watch_queue: Free the page array when watch_queue is dismantled

2022-04-02 10:37:39 -07:00

watchdog_hld.c

Revert "printk: add functions to prefer direct printing"

2022-06-23 18:41:40 +02:00

watchdog.c

Merge branch 'rework/kthreads' into for-linus

2022-06-23 19:11:28 +02:00

workqueue_internal.h

workqueue: Assign a color to barrier work items

2021-08-17 07:49:10 -10:00

workqueue.c

workqueue: Wrap flush_workqueue() using a macro

2022-06-07 07:07:14 -10:00