From 0d4220fa98fbbd8aa0944a6ed87122b579716ff5 Mon Sep 17 00:00:00 2001 From: Thomas Haller Date: Mon, 10 Sep 2018 15:22:28 +0200 Subject: [PATCH 1/9] systemd/dhcp: fix assertion starting DHCP client without MAC address An assertion in dhcp_network_bind_raw_socket() is triggered when starting an sd_dhcp_client without setting setting a MAC address first. - sd_dhcp_client_start() - client_start() - client_start_delayed() - dhcp_network_bind_raw_socket() In that case, the arp-type and MAC address is still unset. Note that dhcp_network_bind_raw_socket() already checks for a valid arp-type and MAC address below, so we should just gracefully return -EINVAL. Maybe sd_dhcp_client_start() should fail earlier when starting without MAC address. But the failure here will be correctly propagated and the start aborted. See-also: https://github.com/systemd/systemd/pull/10054 (cherry picked from commit 34af574d5810ab2b0d6d354cbc28135cde4a55b1) (cherry picked from commit 0a797bdc2a592385a21e7ed918c08ef54a346d99) (cherry picked from commit f37ed84ca495ee212b1e82b9c5a5682c4acfebcd) --- src/systemd/src/libsystemd-network/dhcp-network.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/src/systemd/src/libsystemd-network/dhcp-network.c b/src/systemd/src/libsystemd-network/dhcp-network.c index 90fe29d04..80e9577cd 100644 --- a/src/systemd/src/libsystemd-network/dhcp-network.c +++ b/src/systemd/src/libsystemd-network/dhcp-network.c @@ -128,8 +128,6 @@ int dhcp_network_bind_raw_socket(int ifindex, union sockaddr_union *link, const uint8_t *bcast_addr = NULL; uint8_t dhcp_hlen = 0; - assert_return(mac_addr_len > 0, -EINVAL); - if (arp_type == ARPHRD_ETHER) { assert_return(mac_addr_len == ETH_ALEN, -EINVAL); memcpy(ð_mac, mac_addr, ETH_ALEN); -- 2.17.1 From ee92f8164c0ecee86cec104240f0bbe155901891 Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Sun, 30 Sep 2018 20:23:58 +0900 Subject: [PATCH 2/9] dhcp6: check option length before reading values Fixes oss-fuzz#10746 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10746. https://github.com/systemd/systemd/pull/10213 https://github.com/systemd/systemd/commit/84452783b8bcc44e0dbb7fa6ddc6dad8c064bdfe (cherry picked from commit 484e92e17f93aa9658944dc886d420ef32bc625e) (cherry picked from commit 0cec1cb93edd2efa6bee8e2ec1000d94a86ec61e) (cherry picked from commit 8b8b248679ee17b5c8e68fb8e8e6f6cd3ec32f03) --- src/systemd/src/libsystemd-network/dhcp6-internal.h | 2 +- src/systemd/src/libsystemd-network/dhcp6-option.c | 11 ++++++----- src/systemd/src/libsystemd-network/sd-dhcp6-client.c | 2 +- 3 files changed, 8 insertions(+), 7 deletions(-) diff --git a/src/systemd/src/libsystemd-network/dhcp6-internal.h b/src/systemd/src/libsystemd-network/dhcp6-internal.h index f1cbd6a4f..06e2e5324 100644 --- a/src/systemd/src/libsystemd-network/dhcp6-internal.h +++ b/src/systemd/src/libsystemd-network/dhcp6-internal.h @@ -91,7 +91,7 @@ int dhcp6_option_append_pd(uint8_t *buf, size_t len, DHCP6IA *pd); int dhcp6_option_append_fqdn(uint8_t **buf, size_t *buflen, const char *fqdn); int dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode, size_t *optlen, uint8_t **optvalue); -int dhcp6_option_parse_status(DHCP6Option *option); +int dhcp6_option_parse_status(DHCP6Option *option, size_t len); int dhcp6_option_parse_ia(DHCP6Option *iaoption, DHCP6IA *ia); int dhcp6_option_parse_ip6addrs(uint8_t *optval, uint16_t optlen, struct in6_addr **addrs, size_t count, diff --git a/src/systemd/src/libsystemd-network/dhcp6-option.c b/src/systemd/src/libsystemd-network/dhcp6-option.c index a8a56463a..e462b7083 100644 --- a/src/systemd/src/libsystemd-network/dhcp6-option.c +++ b/src/systemd/src/libsystemd-network/dhcp6-option.c @@ -249,10 +249,11 @@ int dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode, return 0; } -int dhcp6_option_parse_status(DHCP6Option *option) { +int dhcp6_option_parse_status(DHCP6Option *option, size_t len) { DHCP6StatusOption *statusopt = (DHCP6StatusOption *)option; - if (be16toh(option->len) + sizeof(DHCP6Option) < sizeof(*statusopt)) + if (len < sizeof(DHCP6StatusOption) || + be16toh(option->len) + sizeof(DHCP6Option) < sizeof(DHCP6StatusOption)) return -ENOBUFS; return be16toh(statusopt->status); @@ -279,7 +280,7 @@ static int dhcp6_option_parse_address(DHCP6Option *option, DHCP6IA *ia, } if (be16toh(option->len) + sizeof(DHCP6Option) > sizeof(*addr_option)) { - r = dhcp6_option_parse_status((DHCP6Option *)addr_option->options); + r = dhcp6_option_parse_status((DHCP6Option *)addr_option->options, be16toh(option->len) + sizeof(DHCP6Option) - sizeof(*addr_option)); if (r != 0) return r < 0 ? r: 0; } @@ -319,7 +320,7 @@ static int dhcp6_option_parse_pdprefix(DHCP6Option *option, DHCP6IA *ia, } if (be16toh(option->len) + sizeof(DHCP6Option) > sizeof(*pdprefix_option)) { - r = dhcp6_option_parse_status((DHCP6Option *)pdprefix_option->options); + r = dhcp6_option_parse_status((DHCP6Option *)pdprefix_option->options, be16toh(option->len) + sizeof(DHCP6Option) - sizeof(*pdprefix_option)); if (r != 0) return r < 0 ? r: 0; } @@ -464,7 +465,7 @@ int dhcp6_option_parse_ia(DHCP6Option *iaoption, DHCP6IA *ia) { case SD_DHCP6_OPTION_STATUS_CODE: - status = dhcp6_option_parse_status(option); + status = dhcp6_option_parse_status(option, optlen); if (status) { log_dhcp6_client(client, "IA status %d", status); diff --git a/src/systemd/src/libsystemd-network/sd-dhcp6-client.c b/src/systemd/src/libsystemd-network/sd-dhcp6-client.c index ca03f580e..b82e3f45f 100644 --- a/src/systemd/src/libsystemd-network/sd-dhcp6-client.c +++ b/src/systemd/src/libsystemd-network/sd-dhcp6-client.c @@ -828,7 +828,7 @@ static int client_parse_message( break; case SD_DHCP6_OPTION_STATUS_CODE: - status = dhcp6_option_parse_status(option); + status = dhcp6_option_parse_status(option, optlen); if (status) { log_dhcp6_client(client, "%s Status %s", dhcp6_message_type_to_string(message->type), -- 2.17.1 From a944785f244e92094eb4379cf12e76f5205037d3 Mon Sep 17 00:00:00 2001 From: Evgeny Vereshchagin Date: Sat, 29 Sep 2018 03:06:10 +0000 Subject: [PATCH 3/9] dhcp6: fix an off-by-one error in dhcp6_option_parse_domainname ==14==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200055fa9c at pc 0x0000005458f1 bp 0x7ffc78940d90 sp 0x7ffc78940d88 READ of size 1 at 0x60200055fa9c thread T0 #0 0x5458f0 in dhcp6_option_parse_domainname /work/build/../../src/systemd/src/libsystemd-network/dhcp6-option.c:555:29 #1 0x54706e in dhcp6_lease_set_domains /work/build/../../src/systemd/src/libsystemd-network/sd-dhcp6-lease.c:242:13 #2 0x53fce0 in client_parse_message /work/build/../../src/systemd/src/libsystemd-network/sd-dhcp6-client.c:984:29 #3 0x53f3bc in client_receive_advertise /work/build/../../src/systemd/src/libsystemd-network/sd-dhcp6-client.c:1083:13 #4 0x53d57f in client_receive_message /work/build/../../src/systemd/src/libsystemd-network/sd-dhcp6-client.c:1182:21 #5 0x7f0f7159deee in source_dispatch /work/build/../../src/systemd/src/libsystemd/sd-event/sd-event.c:3042:21 #6 0x7f0f7159d431 in sd_event_dispatch /work/build/../../src/systemd/src/libsystemd/sd-event/sd-event.c:3455:21 #7 0x7f0f7159ea8d in sd_event_run /work/build/../../src/systemd/src/libsystemd/sd-event/sd-event.c:3512:21 #8 0x531f2b in fuzz_client /work/build/../../src/systemd/src/fuzz/fuzz-dhcp6-client.c:44:9 #9 0x531bc1 in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-dhcp6-client.c:53:9 #10 0x57bec8 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/libfuzzer/FuzzerLoop.cpp:570:15 #11 0x579d67 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/libfuzzer/FuzzerLoop.cpp:479:3 #12 0x57dc92 in fuzzer::Fuzzer::MutateAndTestOne() /src/libfuzzer/FuzzerLoop.cpp:707:19 #13 0x580ca6 in fuzzer::Fuzzer::Loop(std::__1::vector, std::__1::allocator >, fuzzer::fuzzer_allocator, std::__1::allocator > > > const&) /src/libfuzzer/FuzzerLoop.cpp:838:5 #14 0x55e968 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/libfuzzer/FuzzerDriver.cpp:764:6 #15 0x551a1c in main /src/libfuzzer/FuzzerMain.cpp:20:10 #16 0x7f0f701a082f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #17 0x41e928 in _start (/out/fuzz-dhcp6-client+0x41e928) https://github.com/systemd/systemd/pull/10200 https://github.com/systemd/systemd/commit/b387d3c1327a3ad2a2509bd3d3491e674392ff21 (cherry picked from commit 7cb7cffc4962245a32e87017bcf264005c043250) (cherry picked from commit cd3aacefdd0b91741b7b2e7b5ee5baab210addd9) (cherry picked from commit 5b140a77bc7b01dc002dbf28a7a2507a27a63d7c) --- src/systemd/src/libsystemd-network/dhcp6-option.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/systemd/src/libsystemd-network/dhcp6-option.c b/src/systemd/src/libsystemd-network/dhcp6-option.c index e462b7083..ff1cbf13d 100644 --- a/src/systemd/src/libsystemd-network/dhcp6-option.c +++ b/src/systemd/src/libsystemd-network/dhcp6-option.c @@ -566,7 +566,7 @@ int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char * /* Literal label */ label = (const char *)&optval[pos]; pos += c; - if (pos > optlen) + if (pos >= optlen) return -EMSGSIZE; if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) { -- 2.17.1 From fc04015063d44a61b85bdf2c2648d9ac9fb4a446 Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Thu, 27 Sep 2018 18:04:59 +0900 Subject: [PATCH 4/9] sd-dhcp-lease: fix memleaks (cherry picked from commit e2975f854831d08a25b4f5eb329b6d04102e115f) (cherry picked from commit 157094abd83f933fad142758a7d177cfa1a347f7) (cherry picked from commit 3fd9d11619a5e60d375076fbe13851dd1d3a4a63) --- src/systemd/src/libsystemd-network/sd-dhcp-lease.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/systemd/src/libsystemd-network/sd-dhcp-lease.c b/src/systemd/src/libsystemd-network/sd-dhcp-lease.c index 33a0796a8..841d07926 100644 --- a/src/systemd/src/libsystemd-network/sd-dhcp-lease.c +++ b/src/systemd/src/libsystemd-network/sd-dhcp-lease.c @@ -279,6 +279,8 @@ sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) { free(option); } + free(lease->root_path); + free(lease->timezone); free(lease->hostname); free(lease->domainname); free(lease->dns); -- 2.17.1 From ae56f71f5bd4233f335ec4c2a5172b59be3d80ca Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Thu, 27 Sep 2018 23:48:51 +0900 Subject: [PATCH 5/9] dhcp6: fix buffer size checking (cherry picked from commit cb1bdeaf56852275e6b0dd1fba932bb174767f70) (cherry picked from commit 91fb1673d5217aaf1461998fd2675630f5c265f9) (cherry picked from commit 15a3c6c692ee0125d4673df42ef8986e9e3d69c7) --- src/systemd/src/libsystemd-network/sd-dhcp6-client.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/systemd/src/libsystemd-network/sd-dhcp6-client.c b/src/systemd/src/libsystemd-network/sd-dhcp6-client.c index b82e3f45f..b65c31171 100644 --- a/src/systemd/src/libsystemd-network/sd-dhcp6-client.c +++ b/src/systemd/src/libsystemd-network/sd-dhcp6-client.c @@ -776,8 +776,8 @@ static int client_parse_message( uint8_t *optval; be32_t iaid_lease; - if (len < offsetof(DHCP6Option, data) || - len < offsetof(DHCP6Option, data) + be16toh(option->len)) + if (len < pos + offsetof(DHCP6Option, data) || + len < pos + offsetof(DHCP6Option, data) + be16toh(option->len)) return -ENOBUFS; optcode = be16toh(option->code); -- 2.17.1 From 9babde953073b460d8bcda13329c60a0a74cdc3c Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Fri, 19 Oct 2018 03:44:56 +0900 Subject: [PATCH 6/9] sd-dhcp6: fix argument and error handling of dhcp6_option_parse_status() (cherry picked from commit 91c43f3978fa7c8341550b9ca279e460ba7e74e6) (cherry picked from commit 373cbfc8c6e9591b3c8cc12d58c4b31ac35ab24f) (cherry picked from commit 0e93fd895daa6f0f578ffa8fc4ed3e0ea85c62e8) (cherry picked from commit 6ea13fc82523bebaa08cf2ab8404e751a654261f) --- src/systemd/src/libsystemd-network/dhcp6-option.c | 10 ++++++---- src/systemd/src/libsystemd-network/sd-dhcp6-client.c | 9 +++++---- 2 files changed, 11 insertions(+), 8 deletions(-) diff --git a/src/systemd/src/libsystemd-network/dhcp6-option.c b/src/systemd/src/libsystemd-network/dhcp6-option.c index ff1cbf13d..cfddefcb5 100644 --- a/src/systemd/src/libsystemd-network/dhcp6-option.c +++ b/src/systemd/src/libsystemd-network/dhcp6-option.c @@ -465,13 +465,15 @@ int dhcp6_option_parse_ia(DHCP6Option *iaoption, DHCP6IA *ia) { case SD_DHCP6_OPTION_STATUS_CODE: - status = dhcp6_option_parse_status(option, optlen); - if (status) { + status = dhcp6_option_parse_status(option, optlen + sizeof(DHCP6Option)); + if (status < 0) { + r = status; + goto error; + } + if (status > 0) { log_dhcp6_client(client, "IA status %d", status); - dhcp6_lease_free_ia(ia); - r = -EINVAL; goto error; } diff --git a/src/systemd/src/libsystemd-network/sd-dhcp6-client.c b/src/systemd/src/libsystemd-network/sd-dhcp6-client.c index b65c31171..15c4f445f 100644 --- a/src/systemd/src/libsystemd-network/sd-dhcp6-client.c +++ b/src/systemd/src/libsystemd-network/sd-dhcp6-client.c @@ -828,13 +828,14 @@ static int client_parse_message( break; case SD_DHCP6_OPTION_STATUS_CODE: - status = dhcp6_option_parse_status(option, optlen); - if (status) { + status = dhcp6_option_parse_status(option, optlen + sizeof(DHCP6Option)); + if (status < 0) + return status; + + if (status > 0) { log_dhcp6_client(client, "%s Status %s", dhcp6_message_type_to_string(message->type), dhcp6_message_status_to_string(status)); - dhcp6_lease_free_ia(&lease->ia); - dhcp6_lease_free_ia(&lease->pd); return -EINVAL; } -- 2.17.1 From 19b82104da425efdb9ad0207ccabf5a1a091b81a Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Fri, 19 Oct 2018 03:42:10 +0900 Subject: [PATCH 7/9] sd-dhcp6: make dhcp6_option_parse_domainname() not store empty domain This improves performance of fuzzer. C.f. oss-fuzz#11019. (cherry picked from commit 3c72b6ed4252e7ff5f7704bfe44557ec197b47fa) (cherry picked from commit 50403cccee28c7dcd54b138a0d3b3f69ea0204fe) (cherry picked from commit f11f5abb1a8b96b553d2d156f8b5cf440695c04d) (cherry picked from commit c836279fca80fb22ca7ef02acaa5b987fee61123) --- .../src/libsystemd-network/dhcp6-option.c | 66 ++++++++----------- 1 file changed, 29 insertions(+), 37 deletions(-) diff --git a/src/systemd/src/libsystemd-network/dhcp6-option.c b/src/systemd/src/libsystemd-network/dhcp6-option.c index cfddefcb5..be5c22237 100644 --- a/src/systemd/src/libsystemd-network/dhcp6-option.c +++ b/src/systemd/src/libsystemd-network/dhcp6-option.c @@ -555,6 +555,7 @@ int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char * bool first = true; for (;;) { + const char *label; uint8_t c; c = optval[pos++]; @@ -562,47 +563,41 @@ int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char * if (c == 0) /* End of name */ break; - else if (c <= 63) { - const char *label; - - /* Literal label */ - label = (const char *)&optval[pos]; - pos += c; - if (pos >= optlen) - return -EMSGSIZE; - - if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) { - r = -ENOMEM; - goto fail; - } - - if (first) - first = false; - else - ret[n++] = '.'; - - r = dns_label_escape(label, c, ret + n, DNS_LABEL_ESCAPED_MAX); - if (r < 0) - goto fail; - - n += r; - continue; - } else { - r = -EBADMSG; - goto fail; - } - } + if (c > 63) + return -EBADMSG; + + /* Literal label */ + label = (const char *)&optval[pos]; + pos += c; + if (pos >= optlen) + return -EMSGSIZE; + + if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) + return -ENOMEM; + + if (first) + first = false; + else + ret[n++] = '.'; + + r = dns_label_escape(label, c, ret + n, DNS_LABEL_ESCAPED_MAX); + if (r < 0) + return r; - if (!GREEDY_REALLOC(ret, allocated, n + 1)) { - r = -ENOMEM; - goto fail; + n += r; } + if (n == 0) + continue; + + if (!GREEDY_REALLOC(ret, allocated, n + 1)) + return -ENOMEM; + ret[n] = 0; r = strv_extend(&names, ret); if (r < 0) - goto fail; + return r; idx++; } @@ -610,7 +605,4 @@ int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char * *str_arr = TAKE_PTR(names); return idx; - -fail: - return r; } -- 2.17.1 From 7dd0b1ae8cc44a6e3c91dc921a278f939d045f0d Mon Sep 17 00:00:00 2001 From: Li Song Date: Fri, 19 Oct 2018 13:41:51 -0400 Subject: [PATCH 8/9] sd-dhcp: remove unreachable route after rebinding return NAK (cherry picked from commit cc3981b1272b9ce37e7d734a7b2f42e84acac535) (cherry picked from commit 915c2f675a23b2ae16d292d1ac570706f76b384d) (cherry picked from commit cb77290a696dce924e2a993690634986ac035490) (cherry picked from commit f211b140a5861ddedc2424946e3ab07d3b642b5f) --- src/systemd/src/libsystemd-network/sd-dhcp-client.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/systemd/src/libsystemd-network/sd-dhcp-client.c b/src/systemd/src/libsystemd-network/sd-dhcp-client.c index c2f81e1c4..c28025410 100644 --- a/src/systemd/src/libsystemd-network/sd-dhcp-client.c +++ b/src/systemd/src/libsystemd-network/sd-dhcp-client.c @@ -1649,6 +1649,8 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, i client->timeout_resend = sd_event_source_unref(client->timeout_resend); + client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); + r = client_initialize(client); if (r < 0) goto error; -- 2.17.1 From 5a89e393279e8d0c8c2943b4cce99b91c5ebe903 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Fri, 19 Oct 2018 12:12:33 +0200 Subject: [PATCH 9/9] dhcp6: make sure we have enough space for the DHCP6 option header Fixes a vulnerability originally discovered by Felix Wilhelm from Google. CVE-2018-15688 LP: #1795921 https://bugzilla.redhat.com/show_bug.cgi?id=1639067 (cherry picked from commit 4dac5eaba4e419b29c97da38a8b1f82336c2c892) (cherry picked from commit 01ca2053bbea09f35b958c8cc7631e15469acb79) (cherry picked from commit fc230dca139142f409d7bac99dbfabe9b004e2fb) (cherry picked from commit cc1e5a7f5731f223d1eb8473fa0eecbedfc0ae5f) --- src/systemd/src/libsystemd-network/dhcp6-option.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/systemd/src/libsystemd-network/dhcp6-option.c b/src/systemd/src/libsystemd-network/dhcp6-option.c index be5c22237..22970443d 100644 --- a/src/systemd/src/libsystemd-network/dhcp6-option.c +++ b/src/systemd/src/libsystemd-network/dhcp6-option.c @@ -105,7 +105,7 @@ int dhcp6_option_append_ia(uint8_t **buf, size_t *buflen, DHCP6IA *ia) { return -EINVAL; } - if (*buflen < len) + if (*buflen < offsetof(DHCP6Option, data) + len) return -ENOBUFS; ia_hdr = *buf; -- 2.17.1