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From 89c4300c97739aa3291f0322037bb65068e08d41 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Tue, 19 Jan 2021 23:34:33 -0500
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Subject: [PATCH] Drop bogus IPv6 messages
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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Message-id: <20210119233433.1352902-2-jmaloy@redhat.com>
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Patchwork-id: 100695
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 1/1] Drop bogus IPv6 messages
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Bugzilla: 1918054
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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From: Ralf Haferkamp <rhafer@suse.com>
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Drop IPv6 message shorter than what's mentioned in the payload
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length header (+ the size of the IPv6 header). They're invalid an could
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lead to data leakage in icmp6_send_echoreply().
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(cherry picked from libslirp commit c7ede54cbd2e2b25385325600958ba0124e31cc0)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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slirp/src/ip6_input.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/slirp/src/ip6_input.c b/slirp/src/ip6_input.c
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index d9d2b7e9cd4..0f2b17853ad 100644
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--- a/slirp/src/ip6_input.c
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+++ b/slirp/src/ip6_input.c
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@@ -49,6 +49,13 @@ void ip6_input(struct mbuf *m)
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goto bad;
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}
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+ // Check if the message size is big enough to hold what's
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+ // set in the payload length header. If not this is an invalid
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+ // packet
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+ if (m->m_len < ntohs(ip6->ip_pl) + sizeof(struct ip6)) {
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+ goto bad;
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+ }
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+
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/* check ip_ttl for a correct ICMP reply */
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if (ip6->ip_hl == 0) {
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icmp6_send_error(m, ICMP6_TIMXCEED, ICMP6_TIMXCEED_INTRANS);
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--
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2.27.0
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