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Oleg Nesterov cf4b8c39b9 fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats 
[ Upstream commit 7601df8031fd67310af891897ef6cc0df4209305 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-03-15 10:48:22 -04:00
..
array.c
fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats
2024-03-15 10:48:22 -04:00
base.c
procfs: block chmod on /proc/thread-self/comm
2023-09-13 09:43:02 +02:00
bootconfig.c
proc: bootconfig: Add null pointer check
2022-04-02 08:40:09 -04:00
cmdline.c
…
consoles.c
…
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
procfs: prevent unprivileged processes accessing fdinfo dir
2022-05-09 17:34:28 -07:00
fd.h
…
generic.c
proc: fix dentry/inode overinstantiating under /proc/${pid}/net
2022-05-09 18:29:19 -07:00
inode.c
take care to handle NULL ->proc_lseek()
2022-08-14 15:16:18 -04:00
internal.h
proc: nommu: fix empty /proc/<pid>/maps
2023-10-06 14:56:42 +02:00
interrupts.c
…
Kconfig
proc: make config PROC_CHILDREN depend on PROC_FS
2022-10-03 14:21:43 -07:00
kcore.c
fs/proc/kcore.c: remove check of list iterator against head past the loop body
2022-04-29 14:37:59 -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
…
meminfo.c
proc/meminfo: fix spacing in SecPageTables
2022-11-22 18:50:44 -08:00
namespaces.c
…
nommu.c
proc: delete unused <linux/uaccess.h> includes
2022-07-17 17:31:39 -07:00
page.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
proc_net.c
proc: add some (hopefully) insightful comments
2022-07-29 18:12:35 -07:00
proc_sysctl.c
watchdog: move softlockup_panic back to early_param
2023-11-28 17:07:09 +00:00
proc_tty.c
proc: delete unused <linux/uaccess.h> includes
2022-07-17 17:31:39 -07:00
root.c
proc: add some (hopefully) insightful comments
2022-07-29 18:12:35 -07:00
self.c
…
softirqs.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
stat.c
fs/proc/uptime.c: Fix idle time reporting in /proc/uptime
2021-10-05 15:51:35 +02:00
task_mmu.c
mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
2023-02-09 11:28:20 +01:00
task_nommu.c
proc: nommu: fix empty /proc/<pid>/maps
2023-10-06 14:56:42 +02:00
thread_self.c
…
uptime.c
proc: mark more files as permanent
2022-10-03 14:21:45 -07:00
util.c
…
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()
2023-08-03 10:24:14 +02:00