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: #3496
Previously each 'TmSlot' had it's own packet queue that was passed
to the registered SlotFunc as an argument. This was used mostly for
tunnel packets by the decoders and by defrag.
This patch removes that in favor of a single queue in the ThreadVars:
decode_pq. This is the non-locked version of the queue as this is
only a temporary store for handling packets within a thread.
This patch removes the PacketQueue pointer argument from the API.
The new queue can be accessed directly through the ThreadVars
pointer.
TCP_OPT_INVALID_LEN was set if the opt len was 2. While useless
an empty SACK is not uncommon.
Seen on an iOS device talking to an Apple server.
Bug #3254.
The return value from the options decoder in TCP and IPv4 is ignored.
This commit changes the return type of the function to `void` and
modifies existing return points to return without a value.
When an error occurs, the packet state is being set to indicate whether
it's valid or not and the existing return value is never used.
On MinGW the result of ntohl needs to be casted to uint32_t and
the result of ntohs to uint16_t. To avoid doing this everywhere
add SCNtohl and SCNtohs macros.
Issue:
https://redmine.openinfosecfoundation.org/issues/2041
One approach to fixing this issue to just validate the
checksum instead of regenerating it and comparing it. This
method is used in some kernels and other network tools.
When validating, the current checksum is passed in as an
initial argument which will cause the final checksum to be 0
if OK. If generating a checksum, 0 is passed and the result
is the generated checksum.
Instead of handling the packet update during flow lookup, handle
it in the stream/detect threads. This lowers the load of the
capture thread(s) in autofp mode.
The decoders now set a flag in the packet if the packet needs a
flow lookup. Then the workers will take care of this. The decoders
also already calculate the raw flow hash value. This is so that
this value can be used in flow balancing in autofp.
Because the flow lookup/creation is now done in the worker threads,
the flow balancing can no longer use the flow. It's not yet
available. Autofp load balancing uses raw hash values instead.
In the same line, move UDP AppLayer out of the DecodeUDP module,
and also into the stream/detect threads.
Handle TCP session reuse inside the flow engine itself. If a looked up
flow matches the packet, but is a TCP stream starter, check if the
ssn needs to be reused. If that is the case handle it within the
lookup function. Simplies the locking and removes potential race
conditions.
Until now, the TCP options would all be stored in the Packet structure.
The commonly used ones (wscale, ts, sack, sackok and mss*) then had a
pointer to the position in the option array. Overall this option array
was large. About 360 bytes on 64bit systems. Since no part of the engine
would every access this array other than through the common short cuts,
this was actually just wasteful.
This patch changes the approach. It stores just the common ones in the
packet. The rest is gone. This shrinks the packet structure with almost
300 bytes.
* even though mss wasn't actually used
Most flows are marked for clean up by the flow manager, which then
passes them to the recycler. The recycler logs and cleans up. However,
under resource stress conditions, the packet threads can recycle
existing flow directly. So here the recycler has no role to play, as
the flow is immediately used.
For this reason, the packet threads need to be able to invoke the
flow logger directly.
The flow logging thread ctx will stored in the DecodeThreadVars
stucture. Therefore, this patch makes the DecodeThreadVars an argument
to FlowHandlePacket.
This patch set a new value in pkt->flag to signal that a packet is
invalid during decoding. The patch has been obtained via a coccinelle
transformation.
In some cases, the decoding is not possible and some really invalid
packet can be created. This is in particular the case of tunnel. In
that case, it is more interesting to forget about the tunneled
packet and only consider the original packet.
DecodeTunnel function is maked as warn_unused_result because it is
meaningful for the decoder to know if the underlying data were not
correct. And in this case, only focus detection on the content.
When handling error case on SCMallog, SCCalloc or SCStrdup
we are in an unlikely case. This patch adds the unlikely()
expression to indicate this to gcc.
This patch has been obtained via coccinelle. The transformation
is the following:
@istested@
identifier x;
statement S1;
identifier func =~ "(SCMalloc|SCStrdup|SCCalloc)";
@@
x = func(...)
... when != x
- if (x == NULL) S1
+ if (unlikely(x == NULL)) S1
This patch renames DECODER_SET_EVENT, DECODER_ISSET_EVENT and some
other structures to ENGINE equivalent to take into account the fact
the event list is now related to all engines and not only to decoder.
For convenience, a massive usage of 'Packet p;' declaration has
been done in the tests function. Although this was completely
legal, this is not possible anymore because of the new Packet
allocation structure. This massive patch modifies all suricata
files to use a SCMalloc allocated pointer to Packet instead.
This patch has been done using coccinelle (http://coccinelle.lip6.fr)
which is a semantic patching tool. This ensures that things like call
to SCFree() should have not been forget because the semantic patch
explicitly forces the call to SCFree(p) before each return. With this
patch all unittests are running fine with a small and a big default
packet size.
This patch implements the needed modification of payload access
in a Packet structure to support the abstraction introduced by
the extended data system.
Victor Julien
Jeff Lucovsky
Jason Ish
Eric Leblond
Ken Steele
William Metcalf
Pablo Rincon
Anoop Saldanha
Breno Silva
Brian Rectanus