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| author |   Manfred Spraul <manfred@colorfullife.com> | 2018-08-21 22:01:21 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-22 10:52:51 -0700 |
| commit | 615c999cd8a07b7c3c93bbdee89ef705d2ce52e1 (patch) | |
| tree | 9a61d371b17498dead9ff9136ebd25402bab82fa /ipc/util.c | |
| parent | init/Kconfig: remove EXPERT from CHECKPOINT_RESTORE (diff) | |
| download | linux-dev-615c999cd8a07b7c3c93bbdee89ef705d2ce52e1.tar.xz linux-dev-615c999cd8a07b7c3c93bbdee89ef705d2ce52e1.zip | |
ipc: compute kern_ipc_perm.id under the ipc lock
ipc_addid() initializes kern_ipc_perm.id after having called
ipc_idr_alloc().
Thus a parallel semctl() or msgctl() that uses e.g. MSG_STAT may use this
unitialized value as the return code.
The patch moves all accesses to kern_ipc_perm.id under the spin_lock().
The issues is related to the finding of
syzbot+2827ef6b3385deb07eaf@syzkaller.appspotmail.com: syzbot found an
issue with kern_ipc_perm.seq
Link: http://lkml.kernel.org/r/20180712185241.4017-2-manfred@colorfullife.com
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Reviewed-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/util.c')
0 files changed, 0 insertions, 0 deletions