From: Manfred Spraul Date: Fri, 6 Jun 2014 21:37:42 +0000 (-0700) Subject: ipc/shm.c: increase the defaults for SHMALL, SHMMAX X-Git-Tag: firefly_0821_release~176^2~3820^2~4^2~55 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=060028bac94bf60a65415d1d55a359c3a17d5c31;p=firefly-linux-kernel-4.4.55.git ipc/shm.c: increase the defaults for SHMALL, SHMMAX System V shared memory a) can be abused to trigger out-of-memory conditions and the standard measures against out-of-memory do not work: - it is not possible to use setrlimit to limit the size of shm segments. - segments can exist without association with any processes, thus the oom-killer is unable to free that memory. b) is typically used for shared information - today often multiple GB. (e.g. database shared buffers) The current default is a maximum segment size of 32 MB and a maximum total size of 8 GB. This is often too much for a) and not enough for b), which means that lots of users must change the defaults. This patch increases the default limits (nearly) to the maximum, which is perfect for case b). The defaults are used after boot and as the initial value for each new namespace. Admins/distros that need a protection against a) should reduce the limits and/or enable shm_rmid_forced. Unix has historically required setting these limits for shared memory, and Linux inherited such behavior. The consequence of this is added complexity for users and administrators. One very common example are Database setup/installation documents and scripts, where users must manually calculate the values for these limits. This also requires (some) knowledge of how the underlying memory management works, thus causing, in many occasions, the limits to just be flat out wrong. Disabling these limits sooner could have saved companies a lot of time, headaches and money for support. But it's never too late, simplify users life now. Further notes: - The patch only changes default, overrides behave as before: # sysctl kernel.shmall=33554432 would recreate the previous limit for SHMMAX (for the current namespace). - Disabling sysv shm allocation is possible with: # sysctl kernel.shmall=0 (not a new feature, also per-namespace) - The limits are intentionally set to a value slightly less than ULONG_MAX, to avoid triggering overflows in user space apps. [not unreasonable, see http://marc.info/?l=linux-mm&m=139638334330127] Signed-off-by: Manfred Spraul Signed-off-by: Davidlohr Bueso Reported-by: Davidlohr Bueso Acked-by: Michael Kerrisk Acked-by: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/linux/shm.h b/include/linux/shm.h index 1e2cd2e6b540..57d77709fbe2 100644 --- a/include/linux/shm.h +++ b/include/linux/shm.h @@ -3,9 +3,8 @@ #include #include - -#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */ #include + struct shmid_kernel /* private to the kernel */ { struct kern_ipc_perm shm_perm; diff --git a/include/uapi/linux/shm.h b/include/uapi/linux/shm.h index 78b69413f582..74e786de6f4e 100644 --- a/include/uapi/linux/shm.h +++ b/include/uapi/linux/shm.h @@ -9,15 +9,13 @@ /* * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can - * be increased by sysctl + * be modified by sysctl. */ -#define SHMMAX 0x2000000 /* max shared seg size (bytes) */ #define SHMMIN 1 /* min shared seg size (bytes) */ #define SHMMNI 4096 /* max num of segs system wide */ -#ifndef __KERNEL__ -#define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16)) -#endif +#define SHMMAX (ULONG_MAX - (1L<<24)) /* max shared seg size (bytes) */ +#define SHMALL (ULONG_MAX - (1L<<24)) /* max shm system wide (pages) */ #define SHMSEG SHMMNI /* max shared segs per process */