diff options
| author | Manfred Spraul <manfred@colorfullife.com> | 2008-04-29 01:00:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:14 -0700 |
| commit | 6013f67fc1a4c7fa5bcab2d39c1eaa3e260c7ac1 (patch) | |
| tree | 33f61a88048e659359864ec10104e304d8a97a73 /kernel/nsproxy.c | |
| parent | 9edff4ab1f8d82675277a04e359d0ed8bf14a7b7 (diff) | |
ipc: sysvsem: force unshare(CLONE_SYSVSEM) when CLONE_NEWIPC
sys_unshare(CLONE_NEWIPC) doesn't handle the undo lists properly, this can
cause a kernel memory corruption. CLONE_NEWIPC must detach from the existing
undo lists.
Fix, part 2: perform an implicit CLONE_SYSVSEM in CLONE_NEWIPC. CLONE_NEWIPC
creates a new IPC namespace, the task cannot access the existing semaphore
arrays after the unshare syscall. Thus the task can/must detach from the
existing undo list entries, too.
This fixes the kernel corruption, because it makes it impossible that
undo records from two different namespaces are in sysvsem.undo_list.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Serge E. Hallyn <serue@us.ibm.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 'kernel/nsproxy.c')
0 files changed, 0 insertions, 0 deletions