1 files changed, 35 insertions, 0 deletions
diff --git a/app-emulation/qemu/files/qemu-5.0.0-ipv6-slirp-CVE-2020-10756.patch b/app-emulation/qemu/files/qemu-5.0.0-ipv6-slirp-CVE-2020-10756.patch
new file mode 100644
index 000000000000..d1d3c49a58f6
--- /dev/null
+++ b/app-emulation/qemu/files/qemu-5.0.0-ipv6-slirp-CVE-2020-10756.patch
@@ -0,0 +1,35 @@
+https://gitlab.freedesktop.org/slirp/libslirp/-/commit/c7ede54cbd2e2b25385325600958ba0124e31cc0
+https://bugzilla.redhat.com/show_bug.cgi?id=1835986
+https://bugs.gentoo.org/731992
+
+From c7ede54cbd2e2b25385325600958ba0124e31cc0 Mon Sep 17 00:00:00 2001
+From: Ralf Haferkamp <rhafer@suse.com>
+Date: Fri, 3 Jul 2020 14:51:16 +0200
+Subject: [PATCH] Drop bogus IPv6 messages
+
+Drop IPv6 message shorter than what's mentioned in the payload
+length header (+ the size of the IPv6 header). They're invalid an could
+lead to data leakage in icmp6_send_echoreply().
+---
+ src/ip6_input.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+--- a/slirp/src/ip6_input.c
++++ b/slirp/src/ip6_input.c
+@@ -49,6 +49,13 @@ void ip6_input(struct mbuf *m)
+         goto bad;
+     }
+ 
++    // Check if the message size is big enough to hold what's
++    // set in the payload length header. If not this is an invalid
++    // packet
++    if (m->m_len < ntohs(ip6->ip_pl) + sizeof(struct ip6)) {
++        goto bad;
++    }
++
+     /* check ip_ttl for a correct ICMP reply */
+     if (ip6->ip_hl == 0) {
+         icmp6_send_error(m, ICMP6_TIMXCEED, ICMP6_TIMXCEED_INTRANS);
+-- 
+GitLab
+