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linux/fs/proc
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Oleg Nesterov 7601df8031 fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats 
lock_task_sighand() can trigger a hard lockup.  If NR_CPUS threads call
do_task_stat() at the same time and the process has NR_THREADS, it will
spin with irqs disabled O(NR_CPUS * NR_THREADS) time.

Change do_task_stat() to use sig->stats_lock to gather the statistics
outside of ->siglock protected section, in the likely case this code will
run lockless.

Link: https://lkml.kernel.org/r/20240123153357.GA21857@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Dylan Hatch <dylanbhatch@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-02-07 21:20:33 -08:00
..
array.c
fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats
2024-02-07 21:20:33 -08:00
base.c
proc: Use lsmids instead of lsm names for attrs
2023-11-12 22:54:42 -05:00
bootconfig.c
fs/proc: Add boot loader arguments as comment to /proc/bootconfig
2023-10-07 10:45:56 +09:00
cmdline.c
proc: mark /proc/cmdline as permanent
2023-02-02 22:50:02 -08:00
consoles.c
proc: consoles: use console_list_lock for list iteration
2022-12-02 11:25:02 +01:00
cpuinfo.c
x86/aperfmperf: Replace aperfmperf_get_khz()
2022-04-27 20:22:19 +02:00
devices.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
fd.c
file: convert to SLAB_TYPESAFE_BY_RCU
2023-10-19 11:02:48 +02:00
fd.h
fs: port ->permission() to pass mnt_idmap
2023-01-19 09:24:28 +01:00
generic.c
fs: pass the request_mask to generic_fillattr
2023-08-09 08:56:36 +02:00
inode.c
As usual, lots of singleton and doubleton patches all over the tree and
2023-11-02 20:53:31 -10:00
internal.h
proc: Use lsmids instead of lsm names for attrs
2023-11-12 22:54:42 -05:00
interrupts.c
proc: introduce proc_create_seq{,_data}
2018-05-16 07:23:35 +02:00
Kconfig
proc: make config PROC_CHILDREN depend on PROC_FS
2022-10-03 14:21:43 -07:00
kcore.c
proc/kcore: do not try to access unaccepted memory
2023-10-04 10:32:22 -07:00
kmsg.c
printk changes for 6.1
2022-10-10 11:24:19 -07:00
loadavg.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
Makefile
proc: bootconfig: Add /proc/bootconfig to show boot config list
2020-01-13 13:19:39 -05:00
meminfo.c
mm: memtest: convert to memtest_report_meminfo()
2023-08-21 13:37:47 -07:00
namespaces.c
Merge branch 'work.openat2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-01-29 11:20:24 -08:00
nommu.c
fs: create helper file_user_path() for user displayed mapped file path
2023-10-19 11:03:15 +02:00
page.c
mm, pagemap: remove SLOB and SLQB from comments and documentation
2023-03-29 10:32:11 +02:00
proc_net.c
v6.6-fs.proc.uapi
2023-08-28 11:43:19 -07:00
proc_sysctl.c
misc cleanups (the part that hadn't been picked by individual fs trees)
2024-01-11 20:23:50 -08:00
proc_tty.c
proc: delete unused <linux/uaccess.h> includes
2022-07-17 17:31:39 -07:00
root.c
fs: super: dynamically allocate the s_shrink
2023-10-04 10:32:26 -07:00
self.c
proc: convert to new timestamp accessors
2023-10-18 14:08:26 +02:00
softirqs.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
stat.c
proc/stat: remove arch_idle_time()
2023-04-18 16:39:33 -07:00
task_mmu.c
fs/proc/task_mmu: move mmu notification mechanism inside mm lock
2024-01-12 15:20:46 -08:00
task_nommu.c
vfs-6.7.misc
2023-10-30 09:14:19 -10:00
thread_self.c
proc: convert to new timestamp accessors
2023-10-18 14:08:26 +02:00
uptime.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
util.c
fs/proc/util.c: include fs/proc/internal.h for name_to_int()
2019-01-04 13:13:45 -08:00
version.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
vmcore.c
proc/vmcore: fix signedness bug in read_from_oldmem()
2023-07-27 13:07:05 -07:00