[PATCH] IPC: access to unmapped vmalloc area in grow_ary()

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 <[email protected]> Signed-off-by: Kirill Korotaev <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
ValorVl · Apr 18, 2006 · a9a5cd5 · a9a5cd5
1 parent 69cf0fa
commit a9a5cd5
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/ipc/util.c b/ipc/util.c
@@ -183,8 +183,7 @@ static int grow_ary(struct ipc_ids* ids, int newsize)
 	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;
 	}