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From 95cf6abd88bedca0533ababfdb6480c3174f3b81 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@redhat.com>
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Date: Fri, 17 Jan 2020 12:00:37 +0100
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Subject: [PATCH 3/3] slirp: use correct size while emulating commands
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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: Philippe Mathieu-Daudé <philmd@redhat.com>
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Message-id: <20200117120037.12800-4-philmd@redhat.com>
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Patchwork-id: 93397
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O-Subject: [RHEL-7.7.z qemu-kvm + RHEL-7.8 qemu-kvm + RHEL-7.9 qemu-kvm PATCH v2 3/3] slirp: use correct size while emulating commands
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Bugzilla: 1791560
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Prasad J Pandit <pjp@fedoraproject.org>
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While emulating services in tcp_emu(), it uses 'mbuf' size
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'm->m_size' to write commands via snprintf(3). Use M_FREEROOM(m)
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size to avoid possible OOB access.
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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Message-Id: <20200109094228.79764-3-ppandit@redhat.com>
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(cherry picked from libslirp commit 82ebe9c370a0e2970fb5695aa19aa5214a6a1c80)
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Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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slirp/tcp_subr.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
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index 321c2a4..19e2245 100644
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--- a/slirp/tcp_subr.c
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+++ b/slirp/tcp_subr.c
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@@ -648,7 +648,7 @@ tcp_emu(struct socket *so, struct mbuf *m)
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n4 = (laddr & 0xff);
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m->m_len = bptr - m->m_data; /* Adjust length */
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- m->m_len += snprintf(bptr, m->m_size - m->m_len,
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+ m->m_len += snprintf(bptr, M_FREEROOM(m),
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"ORT %d,%d,%d,%d,%d,%d\r\n%s",
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n1, n2, n3, n4, n5, n6, x==7?buff:"");
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return 1;
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@@ -681,7 +681,7 @@ tcp_emu(struct socket *so, struct mbuf *m)
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n4 = (laddr & 0xff);
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m->m_len = bptr - m->m_data; /* Adjust length */
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- m->m_len += snprintf(bptr, m->m_size - m->m_len,
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+ m->m_len += snprintf(bptr, M_FREEROOM(m),
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"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
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n1, n2, n3, n4, n5, n6, x==7?buff:"");
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@@ -707,8 +707,8 @@ tcp_emu(struct socket *so, struct mbuf *m)
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if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
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(so = tcp_listen(slirp, INADDR_ANY, 0, so->so_laddr.s_addr,
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htons(lport), SS_FACCEPTONCE)) != NULL)
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- m->m_len = snprintf(m->m_data, m->m_size, "%d",
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- ntohs(so->so_fport)) + 1;
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+ m->m_len = snprintf(m->m_data, M_ROOM(m),
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+ "%d", ntohs(so->so_fport)) + 1;
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return 1;
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case EMU_IRC:
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--
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1.8.3.1
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