From 5a2a43fcb15fb3cb3768929306a265ec6bb17ded Mon Sep 17 00:00:00 2001 From: bobychen Date: Tue, 19 Oct 2021 20:47:52 +0800 Subject: [PATCH] fix cve-2021-3592 cve-2021-3593 cve-2021-3595 fix submodule slirp cve-2021-3592 cve-2021-3593 and cve-2021-3595 Signed-off-by: imxcc Signed-off-by: bobychen --- Add-mtod_check.patch | 54 ++++ bootp-check-bootp_input-buffer-size.patch | 36 +++ ...or-specific-area-to-input-packet-mem.patch | 161 +++++++++++ qemu.spec | 11 +- tftp-check-tftp_input-buffer-size.patch | 37 +++ tftp-introduce-a-header-structure.patch | 252 ++++++++++++++++++ upd6-check-udp6_input-buffer-size.patch | 36 +++ 7 files changed, 586 insertions(+), 1 deletion(-) create mode 100644 Add-mtod_check.patch create mode 100644 bootp-check-bootp_input-buffer-size.patch create mode 100644 bootp-limit-vendor-specific-area-to-input-packet-mem.patch create mode 100644 tftp-check-tftp_input-buffer-size.patch create mode 100644 tftp-introduce-a-header-structure.patch create mode 100644 upd6-check-udp6_input-buffer-size.patch diff --git a/Add-mtod_check.patch b/Add-mtod_check.patch new file mode 100644 index 0000000..7309bc4 --- /dev/null +++ b/Add-mtod_check.patch @@ -0,0 +1,54 @@ +From 8cb4d202d4e5713e9b2b5f0ec817234941623f10 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= +Date: Fri, 4 Jun 2021 15:58:25 +0400 +Subject: [PATCH 1/6] Add mtod_check() +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Recent security issues demonstrate the lack of safety care when casting +a mbuf to a particular structure type. At least, it should check that +the buffer is large enough. The following patches will make use of this +function. + +Signed-off-by: Marc-André Lureau +Signed-off-by: imxcc +--- + slirp/src/mbuf.c | 11 +++++++++++ + slirp/src/mbuf.h | 1 + + 2 files changed, 12 insertions(+) + +diff --git a/slirp/src/mbuf.c b/slirp/src/mbuf.c +index 4fd62282..6d0653ed 100644 +--- a/slirp/src/mbuf.c ++++ b/slirp/src/mbuf.c +@@ -222,3 +222,14 @@ struct mbuf *dtom(Slirp *slirp, void *dat) + + return (struct mbuf *)0; + } ++ ++void *mtod_check(struct mbuf *m, size_t len) ++{ ++ if (m->m_len >= len) { ++ return m->m_data; ++ } ++ ++ DEBUG_ERROR("mtod failed"); ++ ++ return NULL; ++} +diff --git a/slirp/src/mbuf.h b/slirp/src/mbuf.h +index 546e7852..2015e323 100644 +--- a/slirp/src/mbuf.h ++++ b/slirp/src/mbuf.h +@@ -118,6 +118,7 @@ void m_inc(struct mbuf *, int); + void m_adj(struct mbuf *, int); + int m_copy(struct mbuf *, struct mbuf *, int, int); + struct mbuf *dtom(Slirp *, void *); ++void *mtod_check(struct mbuf *, size_t len); + + static inline void ifs_init(struct mbuf *ifm) + { +-- +2.27.0 + diff --git a/bootp-check-bootp_input-buffer-size.patch b/bootp-check-bootp_input-buffer-size.patch new file mode 100644 index 0000000..3c4829e --- /dev/null +++ b/bootp-check-bootp_input-buffer-size.patch @@ -0,0 +1,36 @@ +From ab454ca5f45a842b2517a0f4eb786b6ea3019d5a Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= +Date: Fri, 4 Jun 2021 16:15:14 +0400 +Subject: [PATCH 3/6] bootp: check bootp_input buffer size +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Fixes: CVE-2021-3592 +Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/44 + +Signed-off-by: Marc-André Lureau +Signed-off-by: imxcc +--- + slirp/src/bootp.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/slirp/src/bootp.c b/slirp/src/bootp.c +index 57543271..57891871 100644 +--- a/slirp/src/bootp.c ++++ b/slirp/src/bootp.c +@@ -366,9 +366,9 @@ udp_output(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY); + + void bootp_input(struct mbuf *m) + { +- struct bootp_t *bp = mtod(m, struct bootp_t *); ++ struct bootp_t *bp = mtod_check(m, sizeof(struct bootp_t)); + +- if (bp->bp_op == BOOTP_REQUEST) { ++ if (bp && bp->bp_op == BOOTP_REQUEST) { + bootp_reply(m->slirp, bp, m_end(m)); + } + } +-- +2.27.0 + diff --git a/bootp-limit-vendor-specific-area-to-input-packet-mem.patch b/bootp-limit-vendor-specific-area-to-input-packet-mem.patch new file mode 100644 index 0000000..07fe5cf --- /dev/null +++ b/bootp-limit-vendor-specific-area-to-input-packet-mem.patch @@ -0,0 +1,161 @@ +From 3369988416bd98e97dc3d0400af165c0d9e536e0 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= +Date: Fri, 4 Jun 2021 19:25:28 +0400 +Subject: [PATCH 2/6] bootp: limit vendor-specific area to input packet memory + buffer +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +sizeof(bootp_t) currently holds DHCP_OPT_LEN. Remove this optional field +from the structure, to help with the following patch checking for +minimal header size. Modify the bootp_reply() function to take the +buffer boundaries and avoiding potential buffer overflow. + +Related to CVE-2021-3592. + +https://gitlab.freedesktop.org/slirp/libslirp/-/issues/44 + +Signed-off-by: Marc-André Lureau +Signed-off-by: imxcc +--- + slirp/src/bootp.c | 26 +++++++++++++++----------- + slirp/src/bootp.h | 2 +- + slirp/src/mbuf.c | 5 +++++ + slirp/src/mbuf.h | 1 + + 4 files changed, 22 insertions(+), 12 deletions(-) + +diff --git a/slirp/src/bootp.c b/slirp/src/bootp.c +index 3f9ce255..57543271 100644 +--- a/slirp/src/bootp.c ++++ b/slirp/src/bootp.c +@@ -92,21 +92,22 @@ found: + return bc; + } + +-static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type, ++static void dhcp_decode(const struct bootp_t *bp, ++ const uint8_t *bp_end, ++ int *pmsg_type, + struct in_addr *preq_addr) + { +- const uint8_t *p, *p_end; ++ const uint8_t *p; + int len, tag; + + *pmsg_type = 0; + preq_addr->s_addr = htonl(0L); + + p = bp->bp_vend; +- p_end = p + DHCP_OPT_LEN; + if (memcmp(p, rfc1533_cookie, 4) != 0) + return; + p += 4; +- while (p < p_end) { ++ while (p < bp_end) { + tag = p[0]; + if (tag == RFC1533_PAD) { + p++; +@@ -114,10 +115,10 @@ static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type, + break; + } else { + p++; +- if (p >= p_end) ++ if (p >= bp_end) + break; + len = *p++; +- if (p + len > p_end) { ++ if (p + len > bp_end) { + break; + } + DPRINTF("dhcp: tag=%d len=%d\n", tag, len); +@@ -144,7 +145,9 @@ static void dhcp_decode(const struct bootp_t *bp, int *pmsg_type, + } + } + +-static void bootp_reply(Slirp *slirp, const struct bootp_t *bp) ++static void bootp_reply(Slirp *slirp, ++ const struct bootp_t *bp, ++ const uint8_t *bp_end) + { + BOOTPClient *bc = NULL; + struct mbuf *m; +@@ -157,7 +160,7 @@ static void bootp_reply(Slirp *slirp, const struct bootp_t *bp) + uint8_t client_ethaddr[ETH_ALEN]; + + /* extract exact DHCP msg type */ +- dhcp_decode(bp, &dhcp_msg_type, &preq_addr); ++ dhcp_decode(bp, bp_end, &dhcp_msg_type, &preq_addr); + DPRINTF("bootp packet op=%d msgtype=%d", bp->bp_op, dhcp_msg_type); + if (preq_addr.s_addr != htonl(0L)) + DPRINTF(" req_addr=%08" PRIx32 "\n", ntohl(preq_addr.s_addr)); +@@ -179,9 +182,10 @@ static void bootp_reply(Slirp *slirp, const struct bootp_t *bp) + return; + } + m->m_data += IF_MAXLINKHDR; ++ m_inc(m, sizeof(struct bootp_t) + DHCP_OPT_LEN); + rbp = (struct bootp_t *)m->m_data; + m->m_data += sizeof(struct udpiphdr); +- memset(rbp, 0, sizeof(struct bootp_t)); ++ memset(rbp, 0, sizeof(struct bootp_t) + DHCP_OPT_LEN); + + if (dhcp_msg_type == DHCPDISCOVER) { + if (preq_addr.s_addr != htonl(0L)) { +@@ -235,7 +239,7 @@ static void bootp_reply(Slirp *slirp, const struct bootp_t *bp) + rbp->bp_siaddr = saddr.sin_addr; /* Server IP address */ + + q = rbp->bp_vend; +- end = (uint8_t *)&rbp[1]; ++ end = rbp->bp_vend + DHCP_OPT_LEN; + memcpy(q, rfc1533_cookie, 4); + q += 4; + +@@ -365,6 +369,6 @@ void bootp_input(struct mbuf *m) + struct bootp_t *bp = mtod(m, struct bootp_t *); + + if (bp->bp_op == BOOTP_REQUEST) { +- bootp_reply(m->slirp, bp); ++ bootp_reply(m->slirp, bp, m_end(m)); + } + } +diff --git a/slirp/src/bootp.h b/slirp/src/bootp.h +index 03ece9bf..0d20a944 100644 +--- a/slirp/src/bootp.h ++++ b/slirp/src/bootp.h +@@ -114,7 +114,7 @@ struct bootp_t { + uint8_t bp_hwaddr[16]; + uint8_t bp_sname[64]; + uint8_t bp_file[128]; +- uint8_t bp_vend[DHCP_OPT_LEN]; ++ uint8_t bp_vend[]; + }; + + typedef struct { +diff --git a/slirp/src/mbuf.c b/slirp/src/mbuf.c +index 6d0653ed..7db07c08 100644 +--- a/slirp/src/mbuf.c ++++ b/slirp/src/mbuf.c +@@ -233,3 +233,8 @@ void *mtod_check(struct mbuf *m, size_t len) + + return NULL; + } ++ ++void *m_end(struct mbuf *m) ++{ ++ return m->m_data + m->m_len; ++} +diff --git a/slirp/src/mbuf.h b/slirp/src/mbuf.h +index 2015e323..a9752a36 100644 +--- a/slirp/src/mbuf.h ++++ b/slirp/src/mbuf.h +@@ -119,6 +119,7 @@ void m_adj(struct mbuf *, int); + int m_copy(struct mbuf *, struct mbuf *, int, int); + struct mbuf *dtom(Slirp *, void *); + void *mtod_check(struct mbuf *, size_t len); ++void *m_end(struct mbuf *); + + static inline void ifs_init(struct mbuf *ifm) + { +-- +2.27.0 + diff --git a/qemu.spec b/qemu.spec index 05da123..0e3d75d 100644 --- a/qemu.spec +++ b/qemu.spec @@ -1,6 +1,6 @@ Name: qemu Version: 4.1.0 -Release: 83 +Release: 84 Epoch: 2 Summary: QEMU is a generic and open source machine emulator and virtualizer License: GPLv2 and BSD and MIT and CC-BY-SA-4.0 @@ -560,6 +560,12 @@ Patch0547: vfio-common-Fix-incorrect-address-alignment-in-vfio_.patch Patch0548: vfio-common-Add-address-alignment-check-in-vfio_list.patch Patch0549: uas-add-stream-number-sanity-checks.patch Patch0550: virtio-net-fix-use-after-unmap-free-for-sg.patch +Patch0551: Add-mtod_check.patch +Patch0552: bootp-limit-vendor-specific-area-to-input-packet-mem.patch +Patch0553: bootp-check-bootp_input-buffer-size.patch +Patch0554: upd6-check-udp6_input-buffer-size.patch +Patch0555: tftp-check-tftp_input-buffer-size.patch +Patch0556: tftp-introduce-a-header-structure.patch BuildRequires: flex BuildRequires: gcc @@ -964,6 +970,9 @@ getent passwd qemu >/dev/null || \ %endif %changelog +* Tue Oct 26 2021 imxcc +- fix cve-2021-3592 cve-2021-3593 cve-2021-3595 + * Sun Sep 26 2021 Chen Qun - virtio-net: fix use after unmap/free for sg diff --git a/tftp-check-tftp_input-buffer-size.patch b/tftp-check-tftp_input-buffer-size.patch new file mode 100644 index 0000000..1c642f6 --- /dev/null +++ b/tftp-check-tftp_input-buffer-size.patch @@ -0,0 +1,37 @@ +From 968656cf302ba7f8a3dfaf1013f7d8e80663e63e Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= +Date: Fri, 4 Jun 2021 16:34:30 +0400 +Subject: [PATCH 5/6] tftp: check tftp_input buffer size +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Fixes: CVE-2021-3595 +Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/46 + +Signed-off-by: Marc-André Lureau +Signed-off-by: imxcc +--- + slirp/src/tftp.c | 6 +++++- + 1 file changed, 5 insertions(+), 1 deletion(-) + +diff --git a/slirp/src/tftp.c b/slirp/src/tftp.c +index 2b4176cc..035a0cab 100644 +--- a/slirp/src/tftp.c ++++ b/slirp/src/tftp.c +@@ -449,7 +449,11 @@ static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas, + + void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m) + { +- struct tftp_t *tp = (struct tftp_t *)m->m_data; ++ struct tftp_t *tp = mtod_check(m, offsetof(struct tftp_t, x.tp_buf)); ++ ++ if (tp == NULL) { ++ return; ++ } + + switch (ntohs(tp->tp_op)) { + case TFTP_RRQ: +-- +2.27.0 + diff --git a/tftp-introduce-a-header-structure.patch b/tftp-introduce-a-header-structure.patch new file mode 100644 index 0000000..8f9c790 --- /dev/null +++ b/tftp-introduce-a-header-structure.patch @@ -0,0 +1,252 @@ +From 4330205483be65148e365d968d21efc3f56c4228 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= +Date: Fri, 4 Jun 2021 20:01:20 +0400 +Subject: [PATCH 6/6] tftp: introduce a header structure +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Instead of using a composed structure and potentially reading past the +incoming buffer, use a different structure for the header. + +Signed-off-by: Marc-André Lureau +Signed-off-by: imxcc +--- + slirp/src/tftp.c | 61 ++++++++++++++++++++++++------------------------ + slirp/src/tftp.h | 6 ++++- + 2 files changed, 36 insertions(+), 31 deletions(-) + +diff --git a/slirp/src/tftp.c b/slirp/src/tftp.c +index 035a0cab..ed89e0b5 100644 +--- a/slirp/src/tftp.c ++++ b/slirp/src/tftp.c +@@ -50,7 +50,7 @@ static void tftp_session_terminate(struct tftp_session *spt) + } + + static int tftp_session_allocate(Slirp *slirp, struct sockaddr_storage *srcsas, +- struct tftp_t *tp) ++ struct tftphdr *hdr) + { + struct tftp_session *spt; + int k; +@@ -75,7 +75,7 @@ found: + memcpy(&spt->client_addr, srcsas, sockaddr_size(srcsas)); + spt->fd = -1; + spt->block_size = 512; +- spt->client_port = tp->udp.uh_sport; ++ spt->client_port = hdr->udp.uh_sport; + spt->slirp = slirp; + + tftp_session_update(spt); +@@ -84,7 +84,7 @@ found: + } + + static int tftp_session_find(Slirp *slirp, struct sockaddr_storage *srcsas, +- struct tftp_t *tp) ++ struct tftphdr *hdr) + { + struct tftp_session *spt; + int k; +@@ -94,7 +94,7 @@ static int tftp_session_find(Slirp *slirp, struct sockaddr_storage *srcsas, + + if (tftp_session_in_use(spt)) { + if (sockaddr_equal(&spt->client_addr, srcsas)) { +- if (spt->client_port == tp->udp.uh_sport) { ++ if (spt->client_port == hdr->udp.uh_sport) { + return k; + } + } +@@ -146,13 +146,13 @@ static struct tftp_t *tftp_prep_mbuf_data(struct tftp_session *spt, + } + + static void tftp_udp_output(struct tftp_session *spt, struct mbuf *m, +- struct tftp_t *recv_tp) ++ struct tftphdr *hdr) + { + if (spt->client_addr.ss_family == AF_INET6) { + struct sockaddr_in6 sa6, da6; + + sa6.sin6_addr = spt->slirp->vhost_addr6; +- sa6.sin6_port = recv_tp->udp.uh_dport; ++ sa6.sin6_port = hdr->udp.uh_dport; + da6.sin6_addr = ((struct sockaddr_in6 *)&spt->client_addr)->sin6_addr; + da6.sin6_port = spt->client_port; + +@@ -161,7 +161,7 @@ static void tftp_udp_output(struct tftp_session *spt, struct mbuf *m, + struct sockaddr_in sa4, da4; + + sa4.sin_addr = spt->slirp->vhost_addr; +- sa4.sin_port = recv_tp->udp.uh_dport; ++ sa4.sin_port = hdr->udp.uh_dport; + da4.sin_addr = ((struct sockaddr_in *)&spt->client_addr)->sin_addr; + da4.sin_port = spt->client_port; + +@@ -183,7 +183,7 @@ static int tftp_send_oack(struct tftp_session *spt, const char *keys[], + + tp = tftp_prep_mbuf_data(spt, m); + +- tp->tp_op = htons(TFTP_OACK); ++ tp->hdr.tp_op = htons(TFTP_OACK); + for (i = 0; i < nb; i++) { + n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s", + keys[i]) + +@@ -193,9 +193,8 @@ static int tftp_send_oack(struct tftp_session *spt, const char *keys[], + 1; + } + +- m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + n - +- sizeof(struct udphdr); +- tftp_udp_output(spt, m, recv_tp); ++ m->m_len = G_SIZEOF_MEMBER(struct tftp_t, hdr.tp_op) + n; ++ tftp_udp_output(spt, m, &recv_tp->hdr); + + return 0; + } +@@ -216,21 +215,21 @@ static void tftp_send_error(struct tftp_session *spt, uint16_t errorcode, + + tp = tftp_prep_mbuf_data(spt, m); + +- tp->tp_op = htons(TFTP_ERROR); ++ tp->hdr.tp_op = htons(TFTP_ERROR); + tp->x.tp_error.tp_error_code = htons(errorcode); + slirp_pstrcpy((char *)tp->x.tp_error.tp_msg, sizeof(tp->x.tp_error.tp_msg), + msg); + + m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + 3 + + strlen(msg) - sizeof(struct udphdr); +- tftp_udp_output(spt, m, recv_tp); ++ tftp_udp_output(spt, m, &recv_tp->hdr); + + out: + tftp_session_terminate(spt); + } + + static void tftp_send_next_block(struct tftp_session *spt, +- struct tftp_t *recv_tp) ++ struct tftphdr *hdr) + { + struct mbuf *m; + struct tftp_t *tp; +@@ -244,7 +243,7 @@ static void tftp_send_next_block(struct tftp_session *spt, + + tp = tftp_prep_mbuf_data(spt, m); + +- tp->tp_op = htons(TFTP_DATA); ++ tp->hdr.tp_op = htons(TFTP_DATA); + tp->x.tp_data.tp_block_nr = htons((spt->block_nr + 1) & 0xffff); + + nobytes = tftp_read_data(spt, spt->block_nr, tp->x.tp_data.tp_buf, +@@ -262,7 +261,7 @@ static void tftp_send_next_block(struct tftp_session *spt, + + m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX - nobytes) - + sizeof(struct udphdr); +- tftp_udp_output(spt, m, recv_tp); ++ tftp_udp_output(spt, m, hdr); + + if (nobytes == spt->block_size) { + tftp_session_update(spt); +@@ -285,12 +284,12 @@ static void tftp_handle_rrq(Slirp *slirp, struct sockaddr_storage *srcsas, + int nb_options = 0; + + /* check if a session already exists and if so terminate it */ +- s = tftp_session_find(slirp, srcsas, tp); ++ s = tftp_session_find(slirp, srcsas, &tp->hdr); + if (s >= 0) { + tftp_session_terminate(&slirp->tftp_sessions[s]); + } + +- s = tftp_session_allocate(slirp, srcsas, tp); ++ s = tftp_session_allocate(slirp, srcsas, &tp->hdr); + + if (s < 0) { + return; +@@ -416,29 +415,29 @@ static void tftp_handle_rrq(Slirp *slirp, struct sockaddr_storage *srcsas, + } + + spt->block_nr = 0; +- tftp_send_next_block(spt, tp); ++ tftp_send_next_block(spt, &tp->hdr); + } + + static void tftp_handle_ack(Slirp *slirp, struct sockaddr_storage *srcsas, +- struct tftp_t *tp, int pktlen) ++ struct tftphdr *hdr) + { + int s; + +- s = tftp_session_find(slirp, srcsas, tp); ++ s = tftp_session_find(slirp, srcsas, hdr); + + if (s < 0) { + return; + } + +- tftp_send_next_block(&slirp->tftp_sessions[s], tp); ++ tftp_send_next_block(&slirp->tftp_sessions[s], hdr); + } + + static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas, +- struct tftp_t *tp, int pktlen) ++ struct tftphdr *hdr) + { + int s; + +- s = tftp_session_find(slirp, srcsas, tp); ++ s = tftp_session_find(slirp, srcsas, hdr); + + if (s < 0) { + return; +@@ -449,23 +448,25 @@ static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas, + + void tftp_input(struct sockaddr_storage *srcsas, struct mbuf *m) + { +- struct tftp_t *tp = mtod_check(m, offsetof(struct tftp_t, x.tp_buf)); ++ struct tftphdr *hdr = mtod_check(m, sizeof(struct tftphdr)); + +- if (tp == NULL) { ++ if (hdr == NULL) { + return; + } + +- switch (ntohs(tp->tp_op)) { ++ switch (ntohs(hdr->tp_op)) { + case TFTP_RRQ: +- tftp_handle_rrq(m->slirp, srcsas, tp, m->m_len); ++ tftp_handle_rrq(m->slirp, srcsas, ++ mtod(m, struct tftp_t *), ++ m->m_len); + break; + + case TFTP_ACK: +- tftp_handle_ack(m->slirp, srcsas, tp, m->m_len); ++ tftp_handle_ack(m->slirp, srcsas, hdr); + break; + + case TFTP_ERROR: +- tftp_handle_error(m->slirp, srcsas, tp, m->m_len); ++ tftp_handle_error(m->slirp, srcsas, hdr); + break; + } + } +diff --git a/slirp/src/tftp.h b/slirp/src/tftp.h +index c47bb43c..021f6cf1 100644 +--- a/slirp/src/tftp.h ++++ b/slirp/src/tftp.h +@@ -18,9 +18,13 @@ + #define TFTP_FILENAME_MAX 512 + #define TFTP_BLOCKSIZE_MAX 1428 + +-struct tftp_t { ++struct tftphdr { + struct udphdr udp; + uint16_t tp_op; ++} SLIRP_PACKED; ++ ++struct tftp_t { ++ struct tftphdr hdr; + union { + struct { + uint16_t tp_block_nr; +-- +2.27.0 + diff --git a/upd6-check-udp6_input-buffer-size.patch b/upd6-check-udp6_input-buffer-size.patch new file mode 100644 index 0000000..d9402fe --- /dev/null +++ b/upd6-check-udp6_input-buffer-size.patch @@ -0,0 +1,36 @@ +From 054a233306e781ae3cf66b386b67b68e8ac33c37 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= +Date: Fri, 4 Jun 2021 16:32:55 +0400 +Subject: [PATCH 4/6] upd6: check udp6_input buffer size +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Fixes: CVE-2021-3593 +Fixes: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/45 + +Signed-off-by: Marc-André Lureau +Signed-off-by: imxcc +--- + slirp/src/udp6.c | 5 ++++- + 1 file changed, 4 insertions(+), 1 deletion(-) + +diff --git a/slirp/src/udp6.c b/slirp/src/udp6.c +index 6f9486bb..8c490e4d 100644 +--- a/slirp/src/udp6.c ++++ b/slirp/src/udp6.c +@@ -28,7 +28,10 @@ void udp6_input(struct mbuf *m) + ip = mtod(m, struct ip6 *); + m->m_len -= iphlen; + m->m_data += iphlen; +- uh = mtod(m, struct udphdr *); ++ uh = mtod_check(m, sizeof(struct udphdr)); ++ if (uh == NULL) { ++ goto bad; ++ } + m->m_len += iphlen; + m->m_data -= iphlen; + +-- +2.27.0 + -- Gitee