corosync: fix CVE-2025-30472

Corosync through 3.1.9, if encryption is disabled or the attacker knows
the encryption key, has a stack-based buffer overflow in
orf_token_endian_convert in exec/totemsrp.c via a large UDP packet.

References:
https://nvd.nist.gov/vuln/detail/CVE-2025-30472

Upstream patches:
https://github.com/corosync/corosync/commit/7839990f9cdf34e55435ed90109e82709032466a

Signed-off-by: Jiaying Song <jiaying.song.cn@windriver.com>

2 files changed, 75 insertions, 0 deletions

diff --git a/meta-networking/recipes-extended/corosync/corosync/0001-totemsrp-Check-size-of-orf_token-msg.patch b/meta-networking/recipes-extended/corosync/corosync/0001-totemsrp-Check-size-of-orf_token-msg.patch
new file mode 100644
index 0000000000..fa446624fd
--- /dev/null
+++ b/meta-networking/recipes-extended/corosync/corosync/0001-totemsrp-Check-size-of-orf_token-msg.patch
@@ -0,0 +1,74 @@
+From 8a9e16384720f1837f4676baf62807a441c1e7f1 Mon Sep 17 00:00:00 2001
+From: Jan Friesse <jfriesse@redhat.com>
+Date: Mon, 24 Mar 2025 12:05:08 +0100
+Subject: [PATCH] totemsrp: Check size of orf_token msg
+
+orf_token message is stored into preallocated array on endian convert
+so carefully crafted malicious message can lead to crash of corosync.
+
+Solution is to check message size beforehand.
+
+Upstream-Status: Backport
+[https://github.com/corosync/corosync/commit/7839990f9cdf34e55435ed90109e82709032466a]
+
+CVE: CVE-2025-30472
+
+Signed-off-by: Jan Friesse <jfriesse@redhat.com>
+Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
+Signed-off-by: Jiaying Song <jiaying.song.cn@windriver.com>
+---
+ exec/totemsrp.c | 18 +++++++++++++++++-
+ 1 file changed, 17 insertions(+), 1 deletion(-)
+
+diff --git a/exec/totemsrp.c b/exec/totemsrp.c
+index d8e960a..1e417e5 100644
+--- a/exec/totemsrp.c
++++ b/exec/totemsrp.c
+@@ -3637,12 +3637,20 @@ static int check_orf_token_sanity(
+        const struct totemsrp_instance *instance,
+        const void *msg,
+        size_t msg_len,
++       size_t max_msg_len,
+        int endian_conversion_needed)
+ {
+        int rtr_entries;
+        const struct orf_token *token = (const struct orf_token *)msg;
+        size_t required_len;
+ 
++       if (msg_len > max_msg_len) {
++               log_printf (instance->totemsrp_log_level_security,
++                   "Received orf_token message is too long...  ignoring.");
++
++               return (-1);
++       }
++
+        if (msg_len < sizeof(struct orf_token)) {
+                log_printf (instance->totemsrp_log_level_security,
+                    "Received orf_token message is too short...  ignoring.");
+@@ -3656,6 +3664,13 @@ static int check_orf_token_sanity(
+                rtr_entries = token->rtr_list_entries;
+        }
+ 
++       if (rtr_entries > RETRANSMIT_ENTRIES_MAX) {
++               log_printf (instance->totemsrp_log_level_security,
++                   "Received orf_token message rtr_entries is corrupted...  ignoring.");
++
++               return (-1);
++       }
++
+        required_len = sizeof(struct orf_token) + rtr_entries * sizeof(struct rtr_item);
+        if (msg_len < required_len) {
+                log_printf (instance->totemsrp_log_level_security,
+@@ -3824,7 +3839,8 @@ static int message_handler_orf_token (
+        "Time since last token %0.4f ms", ((float)tv_diff) / 1000000.0);
+ #endif
+ 
+-       if (check_orf_token_sanity(instance, msg, msg_len, endian_conversion_needed) == -1) {
++       if (check_orf_token_sanity(instance, msg, msg_len, sizeof(token_storage),
++           endian_conversion_needed) == -1) {
+                return (0);
+        }
+ 
+-- 
+2.34.1
+
diff --git a/meta-networking/recipes-extended/corosync/corosync_3.0.3.bb b/meta-networking/recipes-extended/corosync/corosync_3.0.3.bb
index ec2a785277..7c5e23ca2f 100644
--- a/meta-networking/recipes-extended/corosync/corosync_3.0.3.bb
+++ b/meta-networking/recipes-extended/corosync/corosync_3.0.3.bb
@@ -9,6 +9,7 @@ inherit autotools pkgconfig systemd
 
 SRC_URI = "https://github.com/${BPN}/${BPN}/releases/download/v${PV}/${BP}.tar.gz \
            file://corosync.conf \
+           file://0001-totemsrp-Check-size-of-orf_token-msg.patch \
           "
 SRC_URI[sha256sum] = "20eb903eb984f6a728282c199825e442e8bba869acefd22390076ef3a33a4ded"
 UPSTREAM_CHECK_REGEX = "(?P<pver>\d+\.(?!99)\d+(\.\d+)+)"