diff options
| author | Manfred Spraul <manfred@colorfullife.com> | 2014-06-06 14:37:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-06 16:08:14 -0700 |
| commit | 1376327ce1f790070ec7128b285e2d8965e760a5 (patch) | |
| tree | 6d6c8b14231b487e476e0aa84775173be45ff455 /ipc | |
| parent | 09c6eb1f651dad601f02435bbd79734954960c42 (diff) | |
| download | lwn-1376327ce1f790070ec7128b285e2d8965e760a5.tar.gz lwn-1376327ce1f790070ec7128b285e2d8965e760a5.zip | |
ipc/shm.c: check for integer overflow during shmget.
SHMMAX is the upper limit for the size of a shared memory segment, counted
in bytes. The actual allocation is that size, rounded up to the next full
page.
Add a check that prevents the creation of segments where the rounded up
size causes an integer overflow.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/shm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 9e51bf246344..89fc354156cb 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -493,6 +493,9 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params) if (size < SHMMIN || size > ns->shm_ctlmax) return -EINVAL; + if (numpages << PAGE_SHIFT < size) + return -ENOSPC; + if (ns->shm_tot + numpages < ns->shm_tot || ns->shm_tot + numpages > ns->shm_ctlall) return -ENOSPC; |