[Qemu-devel] [PATCH for-2.6] nbd: Don't fail handshake on NBD_OPT_LIST descriptions

[Eric Blake <eblake@redhat.com>]

The NBD Protocol states that NBD_REP_SERVER may set
'length > sizeof(namelen) + namelen'; in which case the rest
of the packet is a UTF-8 description of the export.  While we
don't know of any NBD servers that send this description yet,
we had better consume the data so we don't choke when we start
to talk to such a server.

Also, a (buggy/malicious) server that replies with length <
sizeof(namelen) would cause us to block waiting for bytes that
the server is not sending, and one that replies with super-huge
lengths could cause us to temporarily allocate up to 4G memory.
Sanity check things before blindly reading incorrectly.

Signed-off-by: Eric Blake <eblake@redhat.com>
---

Yet another case of code introduced in 2.6 that doesn't play
nicely with spec-compliant servers...

Hopefully I've squashed them all now?

 nbd/client.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/nbd/client.c b/nbd/client.c
index 6777e58..48f2a21 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -192,13 +192,18 @@ static int nbd_receive_list(QIOChannel *ioc, char **name, Error **errp)
             return -1;
         }
     } else if (type == NBD_REP_SERVER) {
+        if (len < sizeof(namelen) || len > NBD_MAX_BUFFER_SIZE) {
+            error_setg(errp, "incorrect option length");
+            return -1;
+        }
         if (read_sync(ioc, &namelen, sizeof(namelen)) != sizeof(namelen)) {
             error_setg(errp, "failed to read option name length");
             return -1;
         }
         namelen = be32_to_cpu(namelen);
-        if (len != (namelen + sizeof(namelen))) {
-            error_setg(errp, "incorrect option mame length");
+        len -= sizeof(namelen);
+        if (len < namelen) {
+            error_setg(errp, "incorrect option name length");
             return -1;
         }
         if (namelen > 255) {
@@ -214,6 +219,20 @@ static int nbd_receive_list(QIOChannel *ioc, char **name, Error **errp)
             return -1;
         }
         (*name)[namelen] = '\0';
+        len -= namelen;
+        if (len) {
+            char *buf = g_malloc(len + 1);
+            if (read_sync(ioc, buf, len) != len) {
+                error_setg(errp, "failed to read export description");
+                g_free(*name);
+                g_free(buf);
+                *name = NULL;
+                return -1;
+            }
+            buf[len] = '\0';
+            TRACE("Ignoring export description: %s", buf);
+            g_free(buf);
+        }
     } else {
         error_setg(errp, "Unexpected reply type %x expected %x",
                    type, NBD_REP_SERVER);
-- 
2.5.5