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nfq: implement "fail-open" support. #11
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On linux >= 3.6, you can use the fail-open option on a NFQ queue to have the kernel accept the packet if userspace is not able to keep pace. Please note that the kernel will not trigger an error if the feature is activated in userspace libraries but not available in kernel. This patch implements the option for suricata by adding a nfq.fail-open configuration variable which is desactivated by default.
inliniac
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Sep 27, 2013
To address: ~~Dr.M~~ Error #1: LEAK 1 direct bytes 0x0892c108-0x0892c109 + 0 indirect bytes ~~Dr.M~~ # 0 replace_malloc [/work/drmemory_package/common/alloc_replace.c:2292] ~~Dr.M~~ # 1 DetectEngineEventParse [/home/victor/dev/oisf/src/detect-engine-event.c:173] ~~Dr.M~~ # 2 _DetectEngineEventSetup [/home/victor/dev/oisf/src/detect-engine-event.c:204] ~~Dr.M~~ # 3 DetectDecodeEventSetup [/home/victor/dev/oisf/src/detect-engine-event.c:248] ~~Dr.M~~ # 4 SigParseOptions [/home/victor/dev/oisf/src/detect-parse.c:510] ~~Dr.M~~ # 5 SigParseOptions [/home/victor/dev/oisf/src/detect-parse.c:523] ~~Dr.M~~ # 6 SigParse [/home/victor/dev/oisf/src/detect-parse.c:881] ~~Dr.M~~ # 7 SigInitHelper [/home/victor/dev/oisf/src/detect-parse.c:1309] ~~Dr.M~~ # 8 SigInit [/home/victor/dev/oisf/src/detect-parse.c:1456] ~~Dr.M~~ # 9 DetectEngineAppendSig [/home/victor/dev/oisf/src/detect-parse.c:1728] ~~Dr.M~~ #10 DetectLoadSigFile [/home/victor/dev/oisf/src/detect.c:334] ~~Dr.M~~ #11 SigLoadSignatures [/home/victor/dev/oisf/src/detect.c:422]
inliniac
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Sep 27, 2013
To address: ~~Dr.M~~ Error #2: LEAK 16 direct bytes 0x08399688-0x08399698 + 2 indirect bytes ~~Dr.M~~ # 0 replace_malloc [/work/drmemory_package/common/alloc_replace.c:2292] ~~Dr.M~~ # 1 SigMatchAlloc [/home/victor/dev/oisf/src/detect-parse.c:201] ~~Dr.M~~ # 2 DetectIPProtoSetup [/home/victor/dev/oisf/src/detect-ipproto.c:523] ~~Dr.M~~ # 3 SigParseOptions [/home/victor/dev/oisf/src/detect-parse.c:510] ~~Dr.M~~ # 4 SigParseOptions [/home/victor/dev/oisf/src/detect-parse.c:523] ~~Dr.M~~ # 5 SigParse [/home/victor/dev/oisf/src/detect-parse.c:881] ~~Dr.M~~ # 6 SigInitHelper [/home/victor/dev/oisf/src/detect-parse.c:1309] ~~Dr.M~~ # 7 SigInit [/home/victor/dev/oisf/src/detect-parse.c:1456] ~~Dr.M~~ # 8 DetectEngineAppendSig [/home/victor/dev/oisf/src/detect-parse.c:1728] ~~Dr.M~~ # 9 DetectLoadSigFile [/home/victor/dev/oisf/src/detect.c:334] ~~Dr.M~~ #10 SigLoadSignatures [/home/victor/dev/oisf/src/detect.c:422] ~~Dr.M~~ #11 LoadSignatures [/home/victor/dev/oisf/src/suricata.c:1706]
inliniac
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that referenced
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Mar 3, 2016
This patch fixes the following leak: Direct leak of 9982880 byte(s) in 2902 object(s) allocated from: #0 0x4c253b in malloc ??:? #1 0x10c39ac in MimeDecInitParser /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/util-decode-mime.c:2379 #2 0x6a0f91 in SMTPProcessRequest /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/app-layer-smtp.c:1085 #3 0x697658 in SMTPParse /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/app-layer-smtp.c:1185 #4 0x68fa7a in SMTPParseClientRecord /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/app-layer-smtp.c:1208 #5 0x6561c5 in AppLayerParserParse /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/app-layer-parser.c:908 #6 0x53dc2e in AppLayerHandleTCPData /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/app-layer.c:444 #7 0xf8e0af in DoReassemble /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp-reassemble.c:2635 #8 0xf8c3f8 in StreamTcpReassembleAppLayer /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp-reassemble.c:3028 #9 0xf94267 in StreamTcpReassembleHandleSegmentUpdateACK /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp-reassemble.c:3404 #10 0xf9643d in StreamTcpReassembleHandleSegment /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp-reassemble.c:3432 #11 0xf578b4 in HandleEstablishedPacketToClient /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp.c:2245 #12 0xeea3c7 in StreamTcpPacketStateEstablished /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp.c:2489 #13 0xec1d38 in StreamTcpPacket /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp.c:4568 #14 0xeb0e16 in StreamTcp /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/stream-tcp.c:5064 #15 0xff52a4 in TmThreadsSlotVarRun /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/tm-threads.c:130 #16 0xffdad1 in TmThreadsSlotVar /home/victor/qa/buildbot/donkey/z600fuzz/Private/src/tm-threads.c:474 #17 0x7f7cd678d181 in start_thread /build/buildd/eglibc-2.19/nptl/pthread_create.c:312 (discriminator 2) We come to this case when a SMTP session contains at least 2 mails and then the ending of the first is not correctly detected. In that case, switching to a new tx seems a good solution. This way we still have partial logging.
victorjulien
referenced
this pull request
in victorjulien/suricata
Apr 7, 2020
Fixes runs with --enable-debug-validation. The target did not init a packet pool, so for a tunnel packet would try to get a packet from an uninitialized pool. In non-debug mode, this silently works by falling back to a packet from alloc. (gdb) bt #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51 #1 0x00007ffff35a6801 in __GI_abort () at abort.c:79 #2 0x00007ffff359639a in __assert_fail_base (fmt=0x7ffff371d7d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x555557fe7260 "!(pool->initialized == 0)", file=file@entry=0x555557fe7220 "tmqh-packetpool.c", line=line@entry=253, function=function@entry=0x555557fe7500 <__PRETTY_FUNCTION__.21181> "PacketPoolGetPacket") at assert.c:92 #3 0x00007ffff3596412 in __GI___assert_fail (assertion=0x555557fe7260 "!(pool->initialized == 0)", file=0x555557fe7220 "tmqh-packetpool.c", line=253, function=0x555557fe7500 <__PRETTY_FUNCTION__.21181> "PacketPoolGetPacket") at assert.c:101 #4 0x00005555577e24be in PacketPoolGetPacket () at tmqh-packetpool.c:253 #5 0x0000555556914ecd in PacketGetFromQueueOrAlloc () at decode.c:183 #6 0x00005555569161e1 in PacketTunnelPktSetup (tv=0x555559863980 <tv>, dtv=0x614000068e40, parent=0x61e0000fc080, pkt=0x61e0000fc470 "LL", len=72, proto=DECODE_TUNNEL_IPV4) at decode.c:286 #7 0x00005555569de694 in DecodeIPv4inIPv6 (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc470 "LL", plen=72) at decode-ipv6.c:59 #8 0x00005555569e60b5 in DecodeIPV6ExtHdrs (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc470 "LL", len=112) at decode-ipv6.c:522 #9 0x00005555569e846f in DecodeIPV6 (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc420 "cLL", len=255) at decode-ipv6.c:641 #10 0x0000555556a032f9 in DecodeRaw (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc420 "cLL", len=255) at decode-raw.c:70 #11 0x0000555557659ba8 in DecodePcapFile (tv=0x555559863980 <tv>, p=0x61e0000fc080, data=0x614000068e40) at source-pcap-file.c:412 #12 0x0000555556573401 in LLVMFuzzerTestOneInput (data=0x613000000047 "\241\262\315\064", size=339) at tests/fuzz/fuzz_sigpcap.c:158 #13 0x0000555557a4dc66 in main (argc=2, argv=0x7fffffffdfa8) at tests/fuzz/onefile.c:51 That line: BUG_ON(pool->initialized == 0);
victorjulien
referenced
this pull request
in victorjulien/suricata
Apr 7, 2020
Fixes runs with --enable-debug-validation. The target did not init a packet pool, so for a tunnel packet would try to get a packet from an uninitialized pool. In non-debug mode, this silently works by falling back to a packet from alloc. (gdb) bt #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51 #1 0x00007ffff35a6801 in __GI_abort () at abort.c:79 #2 0x00007ffff359639a in __assert_fail_base (fmt=0x7ffff371d7d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x555557fe7260 "!(pool->initialized == 0)", file=file@entry=0x555557fe7220 "tmqh-packetpool.c", line=line@entry=253, function=function@entry=0x555557fe7500 <__PRETTY_FUNCTION__.21181> "PacketPoolGetPacket") at assert.c:92 #3 0x00007ffff3596412 in __GI___assert_fail (assertion=0x555557fe7260 "!(pool->initialized == 0)", file=0x555557fe7220 "tmqh-packetpool.c", line=253, function=0x555557fe7500 <__PRETTY_FUNCTION__.21181> "PacketPoolGetPacket") at assert.c:101 #4 0x00005555577e24be in PacketPoolGetPacket () at tmqh-packetpool.c:253 #5 0x0000555556914ecd in PacketGetFromQueueOrAlloc () at decode.c:183 #6 0x00005555569161e1 in PacketTunnelPktSetup (tv=0x555559863980 <tv>, dtv=0x614000068e40, parent=0x61e0000fc080, pkt=0x61e0000fc470 "LL", len=72, proto=DECODE_TUNNEL_IPV4) at decode.c:286 #7 0x00005555569de694 in DecodeIPv4inIPv6 (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc470 "LL", plen=72) at decode-ipv6.c:59 #8 0x00005555569e60b5 in DecodeIPV6ExtHdrs (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc470 "LL", len=112) at decode-ipv6.c:522 #9 0x00005555569e846f in DecodeIPV6 (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc420 "cLL", len=255) at decode-ipv6.c:641 #10 0x0000555556a032f9 in DecodeRaw (tv=0x555559863980 <tv>, dtv=0x614000068e40, p=0x61e0000fc080, pkt=0x61e0000fc420 "cLL", len=255) at decode-raw.c:70 #11 0x0000555557659ba8 in DecodePcapFile (tv=0x555559863980 <tv>, p=0x61e0000fc080, data=0x614000068e40) at source-pcap-file.c:412 #12 0x0000555556573401 in LLVMFuzzerTestOneInput (data=0x613000000047 "\241\262\315\064", size=339) at tests/fuzz/fuzz_sigpcap.c:158 #13 0x0000555557a4dc66 in main (argc=2, argv=0x7fffffffdfa8) at tests/fuzz/onefile.c:51 That line: BUG_ON(pool->initialized == 0);
victorjulien
referenced
this pull request
in victorjulien/suricata
Apr 28, 2020
In case of bad IPv4, TCP or UDP, the per packet ip4vars/tcpvars/udpvar structures would not be cleaned up because the cleanup depends on the 'header' pointer being set, but the error handling would unset that. This could mean these structures were already filled with values before the error was detected. As packets were recycled, the next packet decoding would use this unclean structure. To make things worse these structures are part of unions. IPv4/IPv6 and TCP/ICMPv4/ICMPv6 share the same memory location. LibFuzzer+UBSAN found this both locally and in Oss-Fuzz: decode-ipv6.c:654:9: runtime error: load of value 6, which is not a valid value for type 'bool' #0 0x6146f0 in DecodeIPV6 /src/suricata/src/decode-ipv6.c:654:9 #1 0x617e96 in DecodeNull /src/suricata/src/decode-null.c:70:13 #2 0x9dd8a4 in DecodePcapFile /src/suricata/src/source-pcap-file.c:412:9 #3 0x4c8ed2 in LLVMFuzzerTestOneInput /src/suricata/src/tests/fuzz/fuzz_sigpcap.c:158:25 #4 0x457e51 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:556:15 #5 0x457575 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:470:3 #6 0x459917 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:698:19 #7 0x45a6a5 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:830:5 #8 0x448728 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:824:6 #9 0x472552 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:19:10 #10 0x7ff0d097b82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #11 0x41bde8 in _start (/out/fuzz_sigpcap+0x41bde8) Bug: OISF#3610
victorjulien
referenced
this pull request
in victorjulien/suricata
Apr 28, 2020
In case of bad IPv4, TCP or UDP, the per packet ip4vars/tcpvars/udpvar structures would not be cleaned up because the cleanup depends on the 'header' pointer being set, but the error handling would unset that. This could mean these structures were already filled with values before the error was detected. As packets were recycled, the next packet decoding would use this unclean structure. To make things worse these structures are part of unions. IPv4/IPv6 and TCP/ICMPv4/ICMPv6 share the same memory location. LibFuzzer+UBSAN found this both locally and in Oss-Fuzz: decode-ipv6.c:654:9: runtime error: load of value 6, which is not a valid value for type 'bool' #0 0x6146f0 in DecodeIPV6 /src/suricata/src/decode-ipv6.c:654:9 #1 0x617e96 in DecodeNull /src/suricata/src/decode-null.c:70:13 #2 0x9dd8a4 in DecodePcapFile /src/suricata/src/source-pcap-file.c:412:9 #3 0x4c8ed2 in LLVMFuzzerTestOneInput /src/suricata/src/tests/fuzz/fuzz_sigpcap.c:158:25 #4 0x457e51 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:556:15 #5 0x457575 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:470:3 #6 0x459917 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:698:19 #7 0x45a6a5 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:830:5 #8 0x448728 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:824:6 #9 0x472552 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:19:10 #10 0x7ff0d097b82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #11 0x41bde8 in _start (/out/fuzz_sigpcap+0x41bde8) Bug: OISF#3610
victorjulien
referenced
this pull request
in victorjulien/suricata
Apr 28, 2020
In case of bad IPv4, TCP or UDP, the per packet ip4vars/tcpvars/udpvar structures would not be cleaned up because the cleanup depends on the 'header' pointer being set, but the error handling would unset that. This could mean these structures were already filled with values before the error was detected. As packets were recycled, the next packet decoding would use this unclean structure. To make things worse these structures are part of unions. IPv4/IPv6 and TCP/ICMPv4/ICMPv6 share the same memory location. LibFuzzer+UBSAN found this both locally and in Oss-Fuzz: decode-ipv6.c:654:9: runtime error: load of value 6, which is not a valid value for type 'bool' #0 0x6146f0 in DecodeIPV6 /src/suricata/src/decode-ipv6.c:654:9 #1 0x617e96 in DecodeNull /src/suricata/src/decode-null.c:70:13 #2 0x9dd8a4 in DecodePcapFile /src/suricata/src/source-pcap-file.c:412:9 #3 0x4c8ed2 in LLVMFuzzerTestOneInput /src/suricata/src/tests/fuzz/fuzz_sigpcap.c:158:25 #4 0x457e51 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:556:15 #5 0x457575 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:470:3 #6 0x459917 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:698:19 #7 0x45a6a5 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:830:5 #8 0x448728 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:824:6 #9 0x472552 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:19:10 #10 0x7ff0d097b82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #11 0x41bde8 in _start (/out/fuzz_sigpcap+0x41bde8) Bug: OISF#3496
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This patch is the second version and contains modifications made following initial comments.
On linux >= 3.6, you can use the fail-open option on a NFQ queue
to have the kernel accept the packet if userspace is not able to keep
pace.
Please note that the kernel will not trigger an error if the feature is activated
in userspace libraries but not available in kernel.
This patch implements the option for suricata by adding a nfq.fail-open
configuration variable which is desactivated by default.