044d25bcda
Regenerate the patches using --no-signature --zero-commit --no-numbered as it makes it easier to regenerate exactly the same patches on a different setup.
39 lines
1.6 KiB
Diff
39 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Frediano Ziglio <fziglio@redhat.com>
|
|
Date: Tue, 13 Dec 2016 14:40:10 +0000
|
|
Subject: [spice-server] Prevent integer overflows in capability checks
|
|
|
|
The limits for capabilities are specified using 32 bit unsigned integers.
|
|
This could cause possible integer overflows causing buffer overflows.
|
|
For instance the sum of num_common_caps and num_caps can be 0 avoiding
|
|
additional checks.
|
|
As the link message is now capped to 4096 and the capabilities are
|
|
contained in the link message limit the capabilities to 1024
|
|
(capabilities are expressed in number of uint32_t items).
|
|
|
|
Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
|
|
Acked-by: Christophe Fergeau <cfergeau@redhat.com>
|
|
---
|
|
server/reds.c | 8 ++++++++
|
|
1 file changed, 8 insertions(+)
|
|
|
|
diff --git a/server/reds.c b/server/reds.c
|
|
index e7ebc43..953a95a 100644
|
|
--- a/server/reds.c
|
|
+++ b/server/reds.c
|
|
@@ -2186,6 +2186,14 @@ static void reds_handle_read_link_done(void *opaque)
|
|
link_mess->num_channel_caps = GUINT32_FROM_LE(link_mess->num_channel_caps);
|
|
link_mess->num_common_caps = GUINT32_FROM_LE(link_mess->num_common_caps);
|
|
|
|
+ /* Prevent DoS. Currently we defined only 13 capabilities,
|
|
+ * I expect 1024 to be valid for quite a lot time */
|
|
+ if (link_mess->num_channel_caps > 1024 || link_mess->num_common_caps > 1024) {
|
|
+ reds_send_link_error(link, SPICE_LINK_ERR_INVALID_DATA);
|
|
+ reds_link_free(link);
|
|
+ return;
|
|
+ }
|
|
+
|
|
num_caps = link_mess->num_common_caps + link_mess->num_channel_caps;
|
|
caps = (uint32_t *)((uint8_t *)link_mess + link_mess->caps_offset);
|
|
|