connman: backport fix for CVE-2023-28488

(From OE-Core rev: ee1de8f4e52f98c141f0807484b505287f161aa6)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 64 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/connman/connman/0001-gdhcp-Verify-and-sanitize-packet-length-first.patch b/meta/recipes-connectivity/connman/connman/0001-gdhcp-Verify-and-sanitize-packet-length-first.patch
new file mode 100644
index 0000000000..8e2f47a1d5
--- /dev/null
+++ b/meta/recipes-connectivity/connman/connman/0001-gdhcp-Verify-and-sanitize-packet-length-first.patch
@@ -0,0 +1,63 @@
+From 99e2c16ea1cced34a5dc450d76287a1c3e762138 Mon Sep 17 00:00:00 2001
+From: Daniel Wagner <wagi@monom.org>
+Date: Tue, 11 Apr 2023 08:12:56 +0200
+Subject: [PATCH] gdhcp: Verify and sanitize packet length first
+
+Avoid overwriting the read packet length after the initial test. Thus
+move all the length checks which depends on the total length first
+and do not use the total lenght from the IP packet afterwards.
+
+Fixes CVE-2023-28488
+
+Reported by Polina Smirnova <moe.hwr@gmail.com>
+
+CVE: CVE-2023-28488
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+---
+ gdhcp/client.c | 16 +++++++++-------
+ 1 file changed, 9 insertions(+), 7 deletions(-)
+
+diff --git a/gdhcp/client.c b/gdhcp/client.c
+index 7efa7e45..82017692 100644
+--- a/gdhcp/client.c
++++ b/gdhcp/client.c
+@@ -1319,9 +1319,9 @@ static bool sanity_check(struct ip_udp_dhcp_packet *packet, int bytes)
+ static int dhcp_recv_l2_packet(struct dhcp_packet *dhcp_pkt, int fd,
+                                struct sockaddr_in *dst_addr)
+ {
+-       int bytes;
+        struct ip_udp_dhcp_packet packet;
+        uint16_t check;
++       int bytes, tot_len;
+ 
+        memset(&packet, 0, sizeof(packet));
+ 
+@@ -1329,15 +1329,17 @@ static int dhcp_recv_l2_packet(struct dhcp_packet *dhcp_pkt, int fd,
+        if (bytes < 0)
+                return -1;
+ 
+-       if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp)))
+-               return -1;
+-
+-       if (bytes < ntohs(packet.ip.tot_len))
++       tot_len = ntohs(packet.ip.tot_len);
++       if (bytes > tot_len) {
++               /* ignore any extra garbage bytes */
++               bytes = tot_len;
++       } else if (bytes < tot_len) {
+                /* packet is bigger than sizeof(packet), we did partial read */
+                return -1;
++       }
+ 
+-       /* ignore any extra garbage bytes */
+-       bytes = ntohs(packet.ip.tot_len);
++       if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp)))
++               return -1;
+ 
+        if (!sanity_check(&packet, bytes))
+                return -1;
+-- 
+2.34.1
+
diff --git a/meta/recipes-connectivity/connman/connman_1.41.bb b/meta/recipes-connectivity/connman/connman_1.41.bb
index 79542b2175..3f2e29820f 100644
--- a/meta/recipes-connectivity/connman/connman_1.41.bb
+++ b/meta/recipes-connectivity/connman/connman_1.41.bb
@@ -8,6 +8,7 @@ SRC_URI = "${KERNELORG_MIRROR}/linux/network/${BPN}/${BP}.tar.xz \
            file://CVE-2022-32293_p1.patch \
            file://CVE-2022-32293_p2.patch \
            file://CVE-2022-32292.patch \
+           file://0001-gdhcp-Verify-and-sanitize-packet-length-first.patch \
            "
 
 SRC_URI:append:libc-musl = " file://0002-resolve-musl-does-not-implement-res_ninit.patch"