4508bb8a0c
- kvm-tcp_emu-Fix-oob-access.patch [bz#1791568] - kvm-slirp-use-correct-size-while-emulating-IRC-commands.patch [bz#1791568] - kvm-slirp-use-correct-size-while-emulating-commands.patch [bz#1791568] - kvm-RHEL-hw-i386-disable-nested-PERF_GLOBAL_CTRL-MSR-sup.patch [bz#1559846] - Resolves: bz#1559846 (Nested KVM: limit VMX features according to CPU models - Fast Train) - Resolves: bz#1791568 (CVE-2020-7039 qemu-kvm: QEMU: slirp: OOB buffer access while emulating tcp protocols in tcp_emu() [rhel-av-8.2.0])
72 lines
3.0 KiB
Diff
72 lines
3.0 KiB
Diff
From dfbfcf02738640ab83f7970e636b72b78f166675 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
|
|
Date: Fri, 17 Jan 2020 12:07:58 +0100
|
|
Subject: [PATCH 3/4] slirp: use correct size while emulating commands
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
Message-id: <20200117120758.1076549-4-marcandre.lureau@redhat.com>
|
|
Patchwork-id: 93401
|
|
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
|
|
Bugzilla: 1791568
|
|
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
|
|
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
|
From: Prasad J Pandit <pjp@fedoraproject.org>
|
|
|
|
While emulating services in tcp_emu(), it uses 'mbuf' size
|
|
'm->m_size' to write commands via snprintf(3). Use M_FREEROOM(m)
|
|
size to avoid possible OOB access.
|
|
|
|
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
|
|
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
|
|
Message-Id: <20200109094228.79764-3-ppandit@redhat.com>
|
|
|
|
(cherry picked from commit 82ebe9c370a0e2970fb5695aa19aa5214a6a1c80)
|
|
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
---
|
|
slirp/src/tcp_subr.c | 9 ++++-----
|
|
1 file changed, 4 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/slirp/src/tcp_subr.c b/slirp/src/tcp_subr.c
|
|
index cedbfb2..954d1a6 100644
|
|
--- a/slirp/src/tcp_subr.c
|
|
+++ b/slirp/src/tcp_subr.c
|
|
@@ -696,7 +696,7 @@ int tcp_emu(struct socket *so, struct mbuf *m)
|
|
n4 = (laddr & 0xff);
|
|
|
|
m->m_len = bptr - m->m_data; /* Adjust length */
|
|
- m->m_len += snprintf(bptr, m->m_size - m->m_len,
|
|
+ m->m_len += snprintf(bptr, M_FREEROOM(m),
|
|
"ORT %d,%d,%d,%d,%d,%d\r\n%s", n1, n2, n3, n4,
|
|
n5, n6, x == 7 ? buff : "");
|
|
return 1;
|
|
@@ -731,8 +731,7 @@ int tcp_emu(struct socket *so, struct mbuf *m)
|
|
n4 = (laddr & 0xff);
|
|
|
|
m->m_len = bptr - m->m_data; /* Adjust length */
|
|
- m->m_len +=
|
|
- snprintf(bptr, m->m_size - m->m_len,
|
|
+ m->m_len += snprintf(bptr, M_FREEROOM(m),
|
|
"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
|
|
n1, n2, n3, n4, n5, n6, x == 7 ? buff : "");
|
|
|
|
@@ -758,8 +757,8 @@ int tcp_emu(struct socket *so, struct mbuf *m)
|
|
if (m->m_data[m->m_len - 1] == '\0' && lport != 0 &&
|
|
(so = tcp_listen(slirp, INADDR_ANY, 0, so->so_laddr.s_addr,
|
|
htons(lport), SS_FACCEPTONCE)) != NULL)
|
|
- m->m_len =
|
|
- snprintf(m->m_data, m->m_size, "%d", ntohs(so->so_fport)) + 1;
|
|
+ m->m_len = snprintf(m->m_data, M_ROOM(m),
|
|
+ "%d", ntohs(so->so_fport)) + 1;
|
|
return 1;
|
|
|
|
case EMU_IRC:
|
|
--
|
|
1.8.3.1
|
|
|