ipc: fix ipc data structures inconsistency
authorPhilippe Mikoyan <philippe.mikoyan@skat.systems>
Tue, 6 Feb 2018 23:40:49 +0000 (15:40 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 7 Feb 2018 02:32:46 +0000 (18:32 -0800)
commit87ad4b0d853e8a65d6002f4e7bd3dce4ae3a52da
treec1e7faec69a13a77606fd6e8c9578080ffe531e1
parentbac7a1fff7926fb9891a18fe33650884b0e13e41
ipc: fix ipc data structures inconsistency

As described in the title, this patch fixes <ipc>id_ds inconsistency when
<ipc>ctl_stat executes concurrently with some ds-changing function, e.g.
shmat, msgsnd or whatever.

For instance, if shmctl(IPC_STAT) is running concurrently
with shmat, following data structure can be returned:
{... shm_lpid = 0, shm_nattch = 1, ...}

Link: http://lkml.kernel.org/r/20171202153456.6514-1-philippe.mikoyan@skat.systems
Signed-off-by: Philippe Mikoyan <philippe.mikoyan@skat.systems>
Reviewed-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
ipc/msg.c
ipc/sem.c
ipc/shm.c
ipc/util.c