Jianlin Shi 36969d97fe ipc: only destroy orphaned shm segments on sysctl write ...

proc_ipc_dointvec_minmax_orphans() currently calls shm_destroy_orphaned()
whenever shm_rmid_forced is set, including on sysctl reads.  Reading
/proc/sys/kernel/shm_rmid_forced should not take shm_ids rwsem for write
and walk all segments.

Only run the cleanup when the sysctl is written and the forced RMID policy
is enabled.

When shm_rmid_forced=1, monitoring tools that read
/proc/sys/kernel/shm_rmid_forced trigger the cleanup on every read.

Link: https://lore.kernel.org/all/?q=only+destroy+orphaned+shm+segments+on+sysctl+write
Link: https://lore.kernel.org/tencent_738A8BC6E9EA205F555E4B0DAA154D4F8E0A@qq.com
Signed-off-by: Jianlin Shi <shijianlin11@foxmail.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2026-08-13 15:42:04 -07:00

..

compat.c

…

ipc_sysctl.c

ipc: only destroy orphaned shm segments on sysctl write

2026-08-13 15:42:04 -07:00

Makefile

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mq_sysctl.c

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mqueue.c

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

msg.c

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21 01:02:28 -08:00

msgutil.c

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namespace.c

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21 01:02:28 -08:00

sem.c

ipc/sem.c: use unsigned int for nsops

2026-05-27 14:10:25 +02:00

shm.c

ipc/shm: serialize orphan cleanup with shm_nattch updates

2026-06-03 16:25:49 -07:00

syscall.c

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util.c

ipc: limit next_id allocation to the valid ID range

2026-05-21 19:06:11 -07:00

util.h

…