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[PULL,v3,30/31] block/export: fix vhost-user-blk get_config() information leak

Message ID 20201104184040.285057-31-mst@redhat.com
State Accepted
Commit f8ffcb2bda22bad8e91da70c28ec52724a054f92
Headers show
Series [PULL,v3,01/31] pc: comment style fixup | expand

Commit Message

Michael S. Tsirkin Nov. 4, 2020, 6:42 p.m. UTC 
From: Stefan Hajnoczi <stefanha@redhat.com>

Refuse get_config() requests in excess of sizeof(struct virtio_blk_config).

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20201027173528.213464-5-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 block/export/vhost-user-blk-server.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/block/export/vhost-user-blk-server.c b/block/export/vhost-user-blk-server.c
index 33cc0818b8..62672d1cb9 100644
--- a/block/export/vhost-user-blk-server.c
+++ b/block/export/vhost-user-blk-server.c
@@ -266,6 +266,9 @@  vu_blk_get_config(VuDev *vu_dev, uint8_t *config, uint32_t len)
 {
     VuServer *server = container_of(vu_dev, VuServer, vu_dev);
     VuBlkExport *vexp = container_of(server, VuBlkExport, vu_server);
+
+    g_return_val_if_fail(len <= sizeof(struct virtio_blk_config), -1);
+
     memcpy(config, &vexp->blkcfg, len);
     return 0;
 }