diff options
| -rw-r--r-- | drivers/xen/xenbus/xenbus_xs.c | 6 | ||||
| -rw-r--r-- | include/xen/interface/io/xs_wire.h | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c index b3b8f2f3ad10..6f0121e3be69 100644 --- a/drivers/xen/xenbus/xenbus_xs.c +++ b/drivers/xen/xenbus/xenbus_xs.c @@ -810,6 +810,12 @@ static int process_msg(void) goto out; } + if (msg->hdr.len > XENSTORE_PAYLOAD_MAX) { + kfree(msg); + err = -EINVAL; + goto out; + } + body = kmalloc(msg->hdr.len + 1, GFP_NOIO | __GFP_HIGH); if (body == NULL) { kfree(msg); diff --git a/include/xen/interface/io/xs_wire.h b/include/xen/interface/io/xs_wire.h index f0b6890370be..3c1877caaefc 100644 --- a/include/xen/interface/io/xs_wire.h +++ b/include/xen/interface/io/xs_wire.h @@ -88,4 +88,7 @@ struct xenstore_domain_interface { XENSTORE_RING_IDX rsp_cons, rsp_prod; }; +/* Violating this is very bad. See docs/misc/xenstore.txt. */ +#define XENSTORE_PAYLOAD_MAX 4096 + #endif /* _XS_WIRE_H */ |