diff options
| author | Serge E. Hallyn | 2008-04-29 01:01:00 -0700 |
|---|---|---|
| committer | Linus Torvalds | 2008-04-29 08:06:14 -0700 |
| commit | 02fdb36ae7f55db7757b623acd27a62d5000d755 (patch) | |
| tree | 9d96036a7ee174a2828fbb7497a9f365f4f148a1 /fs/ext4/fsync.c | |
| parent | 6013f67fc1a4c7fa5bcab2d39c1eaa3e260c7ac1 (diff) | |
ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)
CLONE_NEWIPC|CLONE_SYSVSEM interaction isn't handled properly. This can cause
a kernel memory corruption. CLONE_NEWIPC must detach from the existing undo
lists.
Fix, part 3: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC).
With unshare, specifying CLONE_SYSVSEM means unshare the sysvsem. So it seems
reasonable that CLONE_NEWIPC without CLONE_SYSVSEM would just imply
CLONE_SYSVSEM.
However with clone, specifying CLONE_SYSVSEM means *share* the sysvsem. So
calling clone(CLONE_SYSVSEM|CLONE_NEWIPC) is explicitly asking for something
we can't allow. So return -EINVAL in that case.
[akpm@linux-foundation.org: cleanups]
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Cc: Pierre Peiffer <peifferp@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext4/fsync.c')
0 files changed, 0 insertions, 0 deletions