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| author | Vasiliy Kulikov <segoon@openwall.com> | 2011-07-26 16:08:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 16:49:44 -0700 |
| commit | b34a6b1da371ed8af1221459a18c67970f7e3d53 (patch) | |
| tree | 5addc850de13623b172395b9d0d7d670930fa6b3 /include/linux/ipc_namespace.h | |
| parent | d40dcdb0172a1ba853464983a059fb45e0aaf61a (diff) | |
| download | lwn-b34a6b1da371ed8af1221459a18c67970f7e3d53.tar.gz lwn-b34a6b1da371ed8af1221459a18c67970f7e3d53.zip | |
ipc: introduce shm_rmid_forced sysctl
Add support for the shm_rmid_forced sysctl. If set to 1, all shared
memory objects in current ipc namespace will be automatically forced to
use IPC_RMID.
The POSIX way of handling shmem allows one to create shm objects and
call shmdt(), leaving shm object associated with no process, thus
consuming memory not counted via rlimits.
With shm_rmid_forced=1 the shared memory object is counted at least for
one process, so OOM killer may effectively kill the fat process holding
the shared memory.
It obviously breaks POSIX - some programs relying on the feature would
stop working. So set shm_rmid_forced=1 only if you're sure nobody uses
"orphaned" memory. Use shm_rmid_forced=0 by default for compatability
reasons.
The feature was previously impemented in -ow as a configure option.
[akpm@linux-foundation.org: fix documentation, per Randy]
[akpm@linux-foundation.org: fix warning]
[akpm@linux-foundation.org: readability/conventionality tweaks]
[akpm@linux-foundation.org: fix shm_rmid_forced/shm_forced_rmid confusion, use standard comment layout]
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Serge E. Hallyn" <serge.hallyn@canonical.com>
Cc: Daniel Lezcano <daniel.lezcano@free.fr>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Solar Designer <solar@openwall.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/ipc_namespace.h')
| -rw-r--r-- | include/linux/ipc_namespace.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index a6d1655f9607..8a297a5e794c 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -44,6 +44,11 @@ struct ipc_namespace { size_t shm_ctlall; int shm_ctlmni; int shm_tot; + /* + * Defines whether IPC_RMID is forced for _all_ shm segments regardless + * of shmctl() + */ + int shm_rmid_forced; struct notifier_block ipcns_nb; @@ -72,6 +77,7 @@ extern int register_ipcns_notifier(struct ipc_namespace *); extern int cond_register_ipcns_notifier(struct ipc_namespace *); extern void unregister_ipcns_notifier(struct ipc_namespace *); extern int ipcns_notify(unsigned long); +extern void shm_destroy_orphaned(struct ipc_namespace *ns); #else /* CONFIG_SYSVIPC */ static inline int register_ipcns_notifier(struct ipc_namespace *ns) { return 0; } @@ -79,6 +85,7 @@ static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) { return 0; } static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } static inline int ipcns_notify(unsigned long l) { return 0; } +static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} #endif /* CONFIG_SYSVIPC */ #ifdef CONFIG_POSIX_MQUEUE |