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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> |
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| .. | ||
| compat.c | ||
| ipc_sysctl.c | ||
| Makefile | ||
| mq_sysctl.c | ||
| mqueue.c | ||
| msg.c | ||
| msgutil.c | ||
| namespace.c | ||
| sem.c | ||
| shm.c | ||
| syscall.c | ||
| util.c | ||
| util.h | ||