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openSUSE:Leap:15.2:Rings:1-MinimalX
qemu
slirp-use-correct-size-while-emulating-I.patch
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File slirp-use-correct-size-while-emulating-I.patch of Package qemu
From: Prasad J Pandit <pjp@fedoraproject.org> Date: Thu, 9 Jan 2020 15:12:27 +0530 Subject: slirp: use correct size while emulating IRC commands Git-commit: ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9 References: bsc#1163018, CVE-2020-8608 While emulating IRC DCC commands, tcp_emu() uses 'mbuf' size 'm->m_size' to write DCC commands via snprintf(3). This may lead to OOB write access, because 'bptr' points somewhere in the middle of 'mbuf' buffer, not at the start. Use M_FREEROOM(m) size to avoid OOB access. Reported-by: Vishnu Dev TJ <vishnudevtj@gmail.com> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Message-Id: <20200109094228.79764-2-ppandit@redhat.com> Signed-off-by: Bruce Rogers <brogers@suse.com> --- src/tcp_subr.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/slirp/src/tcp_subr.c b/slirp/src/tcp_subr.c index d6dd133a9f7082dbc6fafdfa7e01..6cd181c9f2875528adab3f636aec 100644 --- a/slirp/src/tcp_subr.c +++ b/slirp/src/tcp_subr.c @@ -778,7 +778,8 @@ int tcp_emu(struct socket *so, struct mbuf *m) return 1; } m->m_len = bptr - m->m_data; /* Adjust length */ - m->m_len += snprintf(bptr, m->m_size, "DCC CHAT chat %lu %u%c\n", + m->m_len += snprintf(bptr, M_FREEROOM(m), + "DCC CHAT chat %lu %u%c\n", (unsigned long)ntohl(so->so_faddr.s_addr), ntohs(so->so_fport), 1); } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, @@ -788,8 +789,8 @@ int tcp_emu(struct socket *so, struct mbuf *m) return 1; } m->m_len = bptr - m->m_data; /* Adjust length */ - m->m_len += - snprintf(bptr, m->m_size, "DCC SEND %s %lu %u %u%c\n", buff, + m->m_len += snprintf(bptr, M_FREEROOM(m), + "DCC SEND %s %lu %u %u%c\n", buff, (unsigned long)ntohl(so->so_faddr.s_addr), ntohs(so->so_fport), n1, 1); } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, @@ -799,8 +800,8 @@ int tcp_emu(struct socket *so, struct mbuf *m) return 1; } m->m_len = bptr - m->m_data; /* Adjust length */ - m->m_len += - snprintf(bptr, m->m_size, "DCC MOVE %s %lu %u %u%c\n", buff, + m->m_len += snprintf(bptr, M_FREEROOM(m), + "DCC MOVE %s %lu %u %u%c\n", buff, (unsigned long)ntohl(so->so_faddr.s_addr), ntohs(so->so_fport), n1, 1); }
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