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From dfbfcf02738640ab83f7970e636b72b78f166675 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
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Date: Fri, 17 Jan 2020 12:07:58 +0100
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Subject: [PATCH 3/4] 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: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: <20200117120758.1076549-4-marcandre.lureau@redhat.com>
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Patchwork-id: 93401
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O-Subject: [RHEL-AV-8.1.0 qemu-kvm + RHEL-AV-8.2.0 qemu-kvm PATCH 3/3] slirp: use correct size while emulating commands
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Bugzilla: 1791568
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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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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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 commit 82ebe9c370a0e2970fb5695aa19aa5214a6a1c80)
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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slirp/src/tcp_subr.c | 9 ++++-----
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1 file changed, 4 insertions(+), 5 deletions(-)
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diff --git a/slirp/src/tcp_subr.c b/slirp/src/tcp_subr.c
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index cedbfb2..954d1a6 100644
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--- a/slirp/src/tcp_subr.c
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+++ b/slirp/src/tcp_subr.c
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@@ -696,7 +696,7 @@ int 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", n1, n2, n3, n4,
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n5, n6, x == 7 ? buff : "");
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return 1;
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@@ -731,8 +731,7 @@ int 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 +=
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- 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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@@ -758,8 +757,8 @@ int 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 =
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- snprintf(m->m_data, m->m_size, "%d", 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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