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
devices.c
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
Kconfig
kcore.c	proc/kcore: do not try to access unaccepted memory	2023-10-04 10:32:22 -07:00
kmsg.c
loadavg.c
Makefile
meminfo.c	mm: memtest: convert to memtest_report_meminfo()	2023-08-21 13:37:47 -07:00
namespaces.c
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
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
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
util.c
version.c
vmcore.c	proc/vmcore: fix signedness bug in read_from_oldmem()	2023-07-27 13:07:05 -07:00