| [PATCH] IPC: access to unmapped vmalloc area in grow_ary() [message #2697] |
Mon, 17 April 2006 11:32 |
Kirill Korotaev
Messages: 137
Registered: January 2006
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Senior Member |
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grow_ary() should not copy struct ipc_id_ary (it copies new->p, not
new). Due to this, memcpy() src pointer could hit unmapped vmalloc page
when near page boundary.
Found during OpenVZ stress testing
Signed-Off-By: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-Off-By: Kirill Korotaev <dev@openvz.org>
diff -urp ../git/linux-2.6.16-workgpl/ipc/util.c linux-2.6.16/ipc/util.c
--- ../git/linux-2.6.16-workgpl/ipc/util.c 2006-04-13 16:01:47.000000000 +0400
+++ linux-2.6.16/ipc/util.c 2006-04-13 16:01:05.000000000 +0400
@@ -187,8 +187,7 @@ static int grow_ary(struct ipc_ids* ids,
if(new == NULL)
return size;
new->size = newsize;
- memcpy(new->p, ids->entries->p, sizeof(struct kern_ipc_perm *)*size +
- sizeof(struct ipc_id_ary));
+ memcpy(new->p, ids->entries->p, sizeof(struct kern_ipc_perm *)*size);
for(i=size;i<newsize;i++) {
new->p[i] = NULL;
}
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