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Vasily Averin 05aae468d3 ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 
[ Upstream commit 5e698222c7 ]

Commit 89163f93c6 ("ipc/util.c: sysvipc_find_ipc() should increase
position index") is causing this bug (seen on 5.6.8):

   # ipcs -q

   ------ Message Queues --------
   key        msqid      owner      perms      used-bytes   messages

   # ipcmk -Q
   Message queue id: 0
   # ipcs -q

   ------ Message Queues --------
   key        msqid      owner      perms      used-bytes   messages
   0x82db8127 0          root       644        0            0

   # ipcmk -Q
   Message queue id: 1
   # ipcs -q

   ------ Message Queues --------
   key        msqid      owner      perms      used-bytes   messages
   0x82db8127 0          root       644        0            0
   0x76d1fb2a 1          root       644        0            0

   # ipcrm -q 0
   # ipcs -q

   ------ Message Queues --------
   key        msqid      owner      perms      used-bytes   messages
   0x76d1fb2a 1          root       644        0            0
   0x76d1fb2a 1          root       644        0            0

   # ipcmk -Q
   Message queue id: 2
   # ipcrm -q 2
   # ipcs -q

   ------ Message Queues --------
   key        msqid      owner      perms      used-bytes   messages
   0x76d1fb2a 1          root       644        0            0
   0x76d1fb2a 1          root       644        0            0

   # ipcmk -Q
   Message queue id: 3
   # ipcrm -q 1
   # ipcs -q

   ------ Message Queues --------
   key        msqid      owner      perms      used-bytes   messages
   0x7c982867 3          root       644        0            0
   0x7c982867 3          root       644        0            0
   0x7c982867 3          root       644        0            0
   0x7c982867 3          root       644        0            0

Whenever an IPC item with a low id is deleted, the items with higher ids
are duplicated, as if filling a hole.

new_pos should jump through hole of unused ids, pos can be updated
inside "for" cycle.

Fixes: 89163f93c6 ("ipc/util.c: sysvipc_find_ipc() should increase position index")
Reported-by: Andreas Schwab <schwab@suse.de>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Waiman Long <longman@redhat.com>
Cc: NeilBrown <neilb@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/4921fe9b-9385-a2b4-1dc4-1099be6d2e39@virtuozzo.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2020-05-20 08:20:16 +02:00
..
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ipc_sysctl.c proc/sysctl: add shared variables for range check 2019-07-18 17:08:07 -07:00
mq_sysctl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
mqueue.c ipc/mqueue.c: change __do_notify() to bypass check_kill_permission() 2020-05-14 07:58:26 +02:00
msg.c ipc/msg.c: consolidate all xxxctl_down() functions 2020-02-11 04:35:07 -08:00
msgutil.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 52 2019-05-24 17:36:42 +02:00
namespace.c ipc: Convert mqueue fs to fs_context 2019-02-28 03:29:29 -05:00
sem.c Revert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()" 2020-02-28 17:22:20 +01:00
shm.c ipc: rename old-style shmctl/semctl/msgctl syscalls 2019-01-25 17:22:50 +01:00
syscall.c ipc: rename old-style shmctl/semctl/msgctl syscalls 2019-01-25 17:22:50 +01:00
util.c ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:20:16 +02:00
util.h ipc: fix sparc64 ipc() wrapper 2019-09-07 21:42:25 +02:00