diff options
authorManfred Spraul <manfred@colorfullife.com>2014-06-06 14:37:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-06 16:08:14 -0700
commit1376327ce1f790070ec7128b285e2d8965e760a5 (patch)
parent09c6eb1f651dad601f02435bbd79734954960c42 (diff)
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>
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;

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