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From 0f659af4870f151e25a7d2184b9a383bff58e3ba 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 12:07:57 +0100
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Subject: [PATCH 2/4] slirp: use correct size while emulating IRC 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: <20200117120758.1076549-3-marcandre.lureau@redhat.com>
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Patchwork-id: 93400
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O-Subject: [RHEL-AV-8.1.0 qemu-kvm + RHEL-AV-8.2.0 qemu-kvm PATCH 2/3] slirp: use correct size while emulating IRC 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 IRC DCC commands, tcp_emu() uses 'mbuf' size
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'm->m_size' to write DCC commands via snprintf(3). This may
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lead to OOB write access, because 'bptr' points somewhere in
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the middle of 'mbuf' buffer, not at the start. Use M_FREEROOM(m)
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size to avoid OOB access.
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Reported-by: Vishnu Dev TJ <vishnudevtj@gmail.com>
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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Message-Id: <20200109094228.79764-2-ppandit@redhat.com>
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(cherry picked from libslirp commit ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9)
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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 | 11 ++++++-----
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1 file changed, 6 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 cbecd64..cedbfb2 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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@@ -778,7 +778,8 @@ int tcp_emu(struct socket *so, struct mbuf *m)
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return 1;
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}
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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, "DCC CHAT chat %lu %u%c\n",
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+ m->m_len += snprintf(bptr, M_FREEROOM(m),
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+ "DCC CHAT chat %lu %u%c\n",
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(unsigned long)ntohl(so->so_faddr.s_addr),
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ntohs(so->so_fport), 1);
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} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport,
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@@ -788,8 +789,8 @@ int tcp_emu(struct socket *so, struct mbuf *m)
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return 1;
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}
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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, "DCC SEND %s %lu %u %u%c\n", buff,
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+ m->m_len += snprintf(bptr, M_FREEROOM(m),
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+ "DCC SEND %s %lu %u %u%c\n", buff,
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(unsigned long)ntohl(so->so_faddr.s_addr),
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ntohs(so->so_fport), n1, 1);
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} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport,
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@@ -799,8 +800,8 @@ int tcp_emu(struct socket *so, struct mbuf *m)
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return 1;
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}
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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, "DCC MOVE %s %lu %u %u%c\n", buff,
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+ m->m_len += snprintf(bptr, M_FREEROOM(m),
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+ "DCC MOVE %s %lu %u %u%c\n", buff,
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(unsigned long)ntohl(so->so_faddr.s_addr),
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ntohs(so->so_fport), n1, 1);
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}
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--
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1.8.3.1
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