new file mode 100644
@@ -0,0 +1,63 @@
+From eb92fb32b746f2104b0f370b5b295bb8dd4bd5e5 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Tue, 7 Mar 2023 22:07:46 +0000
+Subject: [PATCH] Set the default maximum DNS UDP packet size to 1232.
+
+Upstream-Status: Backport [https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=eb92fb32b746f2104b0f370b5b295bb8dd4bd5e5]
+CVE: CVE-2023-28450
+Signed-off-by: Vivek Kumbhar <vkumbhar@mvista.com>
+---
+ CHANGELOG | 8 ++++++++
+ man/dnsmasq.8 | 3 ++-
+ src/config.h | 2 +-
+ 3 files changed, 11 insertions(+), 2 deletions(-)
+
+diff --git a/CHANGELOG b/CHANGELOG
+index d1d7e41..7a560d3 100644
+--- a/CHANGELOG
++++ b/CHANGELOG
+@@ -91,6 +91,14 @@ version 2.81
+ Fix write-after-free error in DHCPv6 server code.
+ CVE-2022-0934 refers.
+
++ Set the default maximum DNS UDP packet sice to 1232. This
++ has been the recommended value since 2020 because it's the
++ largest value that avoid fragmentation, and fragmentation
++ is just not reliable on the modern internet, especially
++ for IPv6. It's still possible to override this with
++ --edns-packet-max for special circumstances.
++
++
+ version 2.80
+ Add support for RFC 4039 DHCP rapid commit. Thanks to Ashram Method
+ for the initial patch and motivation.
+diff --git a/man/dnsmasq.8 b/man/dnsmasq.8
+index f2803f9..3cca4bc 100644
+--- a/man/dnsmasq.8
++++ b/man/dnsmasq.8
+@@ -168,7 +168,8 @@ to zero completely disables DNS function, leaving only DHCP and/or TFTP.
+ .TP
+ .B \-P, --edns-packet-max=<size>
+ Specify the largest EDNS.0 UDP packet which is supported by the DNS
+-forwarder. Defaults to 4096, which is the RFC5625-recommended size.
++forwarder. Defaults to 1232, which is the recommended size following the
++DNS flag day in 2020. Only increase if you know what you are doing.
+ .TP
+ .B \-Q, --query-port=<query_port>
+ Send outbound DNS queries from, and listen for their replies on, the
+diff --git a/src/config.h b/src/config.h
+index 54f6f48..29ac3e7 100644
+--- a/src/config.h
++++ b/src/config.h
+@@ -19,7 +19,7 @@
+ #define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
+ #define TCP_MAX_QUERIES 100 /* Maximum number of queries per incoming TCP connection */
+ #define TCP_BACKLOG 32 /* kernel backlog limit for TCP connections */
+-#define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
++#define EDNS_PKTSZ 1232 /* default max EDNS.0 UDP packet from from /dnsflagday.net/2020 */
+ #define SAFE_PKTSZ 1280 /* "go anywhere" UDP packet size */
+ #define KEYBLOCK_LEN 40 /* choose to minimise fragmentation when storing DNSSEC keys */
+ #define DNSSEC_WORK 50 /* Max number of queries to validate one question */
+--
+2.18.2
+
@@ -12,4 +12,5 @@ SRC_URI += "\
file://CVE-2020-25686-2.patch \
file://CVE-2021-3448.patch \
file://CVE-2022-0934.patch \
+ file://CVE-2023-28450.patch \
"
Set the default maximum DNS UDP packet size to 1232. http://www.dnsflagday.net/2020/ refers. Signed-off-by: Vivek Kumbhar <vkumbhar@mvista.com> --- .../dnsmasq/dnsmasq/CVE-2023-28450.patch | 63 +++++++++++++++++++ .../recipes-support/dnsmasq/dnsmasq_2.81.bb | 1 + 2 files changed, 64 insertions(+) create mode 100644 meta-networking/recipes-support/dnsmasq/dnsmasq/CVE-2023-28450.patch