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Valentin Schneider d425f34821 kexec: turn all kexec_mutex acquisitions into trylocks 
commit 7bb5da0d49 upstream.

Patch series "kexec, panic: Making crash_kexec() NMI safe", v4.


This patch (of 2):

Most acquistions of kexec_mutex are done via mutex_trylock() - those were
a direct "translation" from:

  8c5a1cf0ad ("kexec: use a mutex for locking rather than xchg()")

there have however been two additions since then that use mutex_lock():
crash_get_memory_size() and crash_shrink_memory().

A later commit will replace said mutex with an atomic variable, and
locking operations will become atomic_cmpxchg().  Rather than having those
mutex_lock() become while (atomic_cmpxchg(&lock, 0, 1)), turn them into
trylocks that can return -EBUSY on acquisition failure.

This does halve the printable size of the crash kernel, but that's still
neighbouring 2G for 32bit kernels which should be ample enough.

Link: https://lkml.kernel.org/r/20220630223258.4144112-1-vschneid@redhat.com
Link: https://lkml.kernel.org/r/20220630223258.4144112-2-vschneid@redhat.com
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Juri Lelli <jlelli@redhat.com>
Cc: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Wen Yang <wenyang.linux@foxmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2023-04-20 12:10:29 +02:00
..
bpf bpf: Adjust insufficient default bpf_jit_limit 2023-04-05 11:23:35 +02:00
cgroup cgroup/cpuset: Wake up cpuset_attach_wq tasks in cpuset_cancel_attach() 2023-04-20 12:10:27 +02:00
configs
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debug lockdown: also lock down previous kgdb use 2022-05-30 09:33:22 +02:00
dma swiotlb: max mapping size takes min align mask into account 2022-10-05 10:38:40 +02:00
entry entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set 2023-01-04 11:39:22 +01:00
events perf/core: Fix the same task check in perf_event_set_output 2023-04-20 12:10:23 +02:00
futex futex: Resend potentially swallowed owner death notification 2023-01-14 10:15:20 +01:00
gcov gcov: add support for checksum field 2023-01-14 10:16:24 +01:00
irq irqdomain: Fix domain registration race 2023-03-17 08:45:08 +01:00
kcsan kcsan: avoid passing -g for test 2023-04-05 11:23:44 +02:00
livepatch livepatch: fix race between fork and KLP transition 2022-10-26 13:25:14 +02:00
locking locking/lockdep: Fix lockdep_init_map_*() confusion 2022-08-21 15:15:33 +02:00
power PM: EM: fix memory leak with using debugfs_lookup() 2023-03-11 16:39:51 +01:00
printk printk: fix return value of printk.devkmsg __setup handler 2022-04-08 14:40:08 +02:00
rcu rcu-tasks: Make rude RCU-Tasks work well with CPU hotplug 2023-03-11 16:39:49 +01:00
sched sched/fair: Fix imbalance overflow 2023-04-20 12:10:28 +02:00
time clocksource: Suspend the watchdog temporarily when high read latency detected 2023-03-11 16:39:50 +01:00
trace ring-buffer: Fix race while reader and writer are on the same page 2023-04-20 12:10:24 +02:00
.gitignore kbuild: update config_data.gz only when the content of .config is changed 2021-05-11 14:47:37 +02:00
Kconfig.freezer
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Kconfig.hz
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Kconfig.locks
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Kconfig.preempt
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Makefile futex: Move to kernel/futex/ 2023-01-14 10:15:20 +01:00
acct.c acct: fix potential integer overflow in encode_comp_t() 2023-01-14 10:16:14 +01:00
async.c Revert "module, async: async_synchronize_full() on module init iff async is used" 2022-02-23 12:01:00 +01:00
audit.c audit: improve audit queue handling when "audit=1" on cmdline 2022-02-08 18:30:34 +01:00
audit.h audit: log AUDIT_TIME_* records only from rules 2022-04-08 14:40:00 +02:00
audit_fsnotify.c audit: fix potential double free on error path from fsnotify_add_inode_mark 2022-08-31 17:15:13 +02:00
audit_tree.c audit: move put_tree() to avoid trim_trees refcount underflow and UAF 2021-09-03 10:09:31 +02:00
audit_watch.c fsnotify: generalize handle_inode_event() 2020-12-30 11:54:18 +01:00
auditfilter.c
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auditsc.c audit: log AUDIT_TIME_* records only from rules 2022-04-08 14:40:00 +02:00
backtracetest.c
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bounds.c
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capability.c LSM: Signal to SafeSetID when setting group IDs 2020-10-13 09:17:34 -07:00
compat.c sched_getaffinity: don't assume 'cpumask_size()' is fully initialized 2023-04-05 11:23:45 +02:00
configs.c
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context_tracking.c
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cpu.c cpu/hotplug: Make target_store() a nop when target == state 2023-01-14 10:15:20 +01:00
cpu_pm.c PM: cpu: Make notifier chain use a raw_spinlock_t 2021-09-15 09:50:40 +02:00
crash_core.c crash_core, vmcoreinfo: append 'SECTION_SIZE_BITS' to vmcoreinfo 2021-06-23 14:42:52 +02:00
crash_dump.c
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cred.c Revert "Add a reference to ucounts for each cred" 2021-09-08 08:49:00 +02:00
delayacct.c
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dma.c
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exec_domain.c
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exit.c exit: Use READ_ONCE() for all oops/warn limit reads 2023-02-01 08:23:21 +01:00
extable.c
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fail_function.c kernel/fail_function: fix memory leak with using debugfs_lookup() 2023-03-11 16:40:18 +01:00
fork.c fork: allow CLONE_NEWTIME in clone3 flags 2023-03-17 08:45:06 +01:00
freezer.c Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing" 2021-04-07 15:00:14 +02:00
gen_kheaders.sh
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groups.c LSM: Signal to SafeSetID when setting group IDs 2020-10-13 09:17:34 -07:00
hung_task.c kernel/hung_task.c: make type annotations consistent 2020-11-02 12:14:19 -08:00
iomem.c
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irq_work.c
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jump_label.c jump_label: Fix jump_label_text_reserved() vs __init 2021-07-20 16:05:58 +02:00
kallsyms.c treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
kcmp.c exec: Transform exec_update_mutex into a rw_semaphore 2021-01-09 13:46:24 +01:00
kcov.c
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kexec.c kexec: move locking into do_kexec_load 2023-04-20 12:10:28 +02:00
kexec_core.c kexec: turn all kexec_mutex acquisitions into trylocks 2023-04-20 12:10:29 +02:00
kexec_elf.c
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kexec_file.c ima: force signature verification when CONFIG_KEXEC_SIG is configured 2022-07-21 21:20:11 +02:00
kexec_internal.h
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kheaders.c
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kmod.c
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kprobes.c x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range 2023-03-11 16:39:59 +01:00
ksysfs.c kexec: turn all kexec_mutex acquisitions into trylocks 2023-04-20 12:10:29 +02:00
kthread.c kthread: Fix PF_KTHREAD vs to_kthread() race 2021-09-03 10:09:31 +02:00
latencytop.c
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module-internal.h
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module.c module: Don't wait for GOING modules 2023-02-01 08:23:22 +01:00
module_signature.c module: harden ELF info handling 2021-03-25 09:04:11 +01:00
module_signing.c module: harden ELF info handling 2021-03-25 09:04:11 +01:00
notifier.c
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nsproxy.c
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padata.c padata: Fix list iterator in padata_do_serial() 2023-01-14 10:15:51 +01:00
panic.c exit: Use READ_ONCE() for all oops/warn limit reads 2023-02-01 08:23:21 +01:00
params.c params: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
pid.c exec: Transform exec_update_mutex into a rw_semaphore 2021-01-09 13:46:24 +01:00
pid_namespace.c rcu-tasks: Fix synchronize_rcu_tasks() VS zap_pid_ns_processes() 2023-03-11 16:39:19 +01:00
profile.c profiling: fix shift too large makes kernel panic 2022-08-21 15:16:05 +02:00
ptrace.c ptrace: Reimplement PTRACE_KILL by always sending SIGKILL 2022-06-09 10:20:49 +02:00
range.c kernel.h: split out min()/max() et al. helpers 2020-10-16 11:11:19 -07:00
reboot.c reboot: fix overflow parsing reboot cpu number 2020-11-14 11:26:03 -08:00
regset.c
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relay.c relay: fix type mismatch when allocating memory in relay_create_buf() 2023-01-14 10:15:22 +01:00
resource.c dax/kmem: Fix leak of memory-hotplug resources 2023-03-11 16:40:04 +01:00
rseq.c rseq: Remove broken uapi field layout on 32-bit little endian 2022-04-08 14:40:03 +02:00
scftorture.c scftorture: Fix distribution of short handler delays 2022-06-09 10:21:01 +02:00
scs.c
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seccomp.c seccomp: Fix setting loaded filter count during TSYNC 2021-08-18 08:59:06 +02:00
signal.c task_work: unconditionally run task_work from get_signal() 2023-01-04 11:39:23 +01:00
smp.c smp: Fix offline cpu check in flush_smp_call_function_queue() 2022-04-20 09:23:29 +02:00
smpboot.c sched/core: Initialize the idle task with preemption disabled 2021-07-14 16:55:50 +02:00
smpboot.h
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softirq.c
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stackleak.c gcc-plugins/stackleak: Use noinstr in favor of notrace 2022-02-23 12:01:00 +01:00
stacktrace.c
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static_call.c static_call: Fix unused variable warn w/o MODULE 2021-09-08 08:49:00 +02:00
stop_machine.c stop_machine, rcu: Mark functions as notrace 2020-10-26 12:12:27 +01:00
sys.c prlimit: do_prlimit needs to have a speculation check 2023-01-24 07:19:58 +01:00
sys_ni.c kernel/sys_ni: add compat entry for fadvise64_64 2022-08-31 17:15:13 +02:00
sysctl-test.c
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sysctl.c sysctl: add proc_dou8vec_minmax() 2023-04-20 12:10:26 +02:00
task_work.c task_work: add helper for more targeted task_work canceling 2023-01-04 11:39:23 +01:00
taskstats.c taskstats: move specifying netlink policy back to ops 2020-10-02 19:11:12 -07:00
test_kprobes.c
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torture.c
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tracepoint.c tracepoint: Use rcu get state and cond sync for static call updates 2021-09-03 10:09:30 +02:00
tsacct.c taskstats: Cleanup the use of task->exit_code 2022-01-27 10:54:33 +01:00
ucount.c Revert "Add a reference to ucounts for each cred" 2021-09-08 08:49:00 +02:00
uid16.c
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uid16.h
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umh.c usermodehelper: reset umask to default before executing user process 2020-10-06 10:31:52 -07:00
up.c smp: Fix smp_call_function_single_async prototype 2021-05-14 09:50:46 +02:00
user-return-notifier.c
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user.c
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user_namespace.c Revert "Add a reference to ucounts for each cred" 2021-09-08 08:49:00 +02:00
usermode_driver.c bpf: Fix umd memory leak in copy_process() 2021-03-30 14:32:03 +02:00
utsname.c
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utsname_sysctl.c
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watch_queue.c watch_queue: fix IOC_WATCH_QUEUE_SET_SIZE alloc error paths 2023-03-17 08:45:13 +01:00
watchdog.c watchdog: export lockup_detector_reconfigure 2022-08-25 11:38:20 +02:00
watchdog_hld.c
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workqueue.c workqueue: don't skip lockdep work dependency in cancel_work_sync() 2022-09-28 11:10:40 +02:00
workqueue_internal.h
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