dhcp6_option_parse_string is intended to clear strings with length 0,
for consistency. The data assert is too strict for this purpose, so we
will allow data || data_len == 0, similar to other dhcp6_option_parse*
helpers.
Fixes: fde788601b ("dhcp6-client: parse RFC8910 captive portal dhcp6 option")
Oracle Cloud sends malformed DHCPv6 replies that have an invalid
byte at the end, which cannot be parsed as an option code.
networkd currently can cope with the invalid option (it is ignored),
but the whole packet is ignored altogether because of the additional
null at the end.
It's better to be liberal in what we accept and actually assign an
address, given that the reply contains a valid IA_NA.
Fixes#28183.
DHCP clients often send their own hostname in option 12. It can be useful
to store it with the lease so it can be shown to a human to easily identify
which lease belongs to which device.
RFC: https://www.rfc-editor.org/rfc/rfc2132#section-3.14
If we fail any allocation prior adding the lease to the server lease
hashmap.
==2103==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 128 byte(s) in 2 object(s) allocated from:
#0 0x4a203e in __interceptor_calloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:77:3
#1 0x4f6341 in calloc (/build/fuzz-dhcp-server+0x4f6341)
#2 0x4ec818 in add_lease /work/build/../../src/systemd/src/libsystemd-network/fuzz-dhcp-server.c:26:9
#3 0x4ec2bf in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/libsystemd-network/fuzz-dhcp-server.c:75:9
#4 0x4f68a8 in NaloFuzzerTestOneInput (/build/fuzz-dhcp-server+0x4f68a8)
#5 0x5158b3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#6 0x51509a in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:514:3
#7 0x516769 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#8 0x517435 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, std::__Fuzzer::allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:895:5
#9 0x50679f in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#10 0x507068 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#11 0x4f6b25 in main (/build/fuzz-dhcp-server+0x4f6b25)
#12 0x7f16084e3082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
DEDUP_TOKEN: __interceptor_calloc--calloc--add_lease
SUMMARY: AddressSanitizer: 128 byte(s) leaked in 2 allocation(s).
Found by Nallocufzz.
Recent gcc versions have started to trigger false positive
maybe-uninitialized warnings. Let's make sure we initialize
variables annotated with _cleanup_ to avoid these.
From RFC 2131 section 4.3.1 (https://www.rfc-editor.org/rfc/rfc2131#section-4.3.1):
----
The server MUST return to the client:
- Parameters requested by the client, according to the following rules:
-- IF the server has been explicitly configured with a default
value for the parameter, the server MUST include that value
in an appropriate option in the 'option' field,
----
The sentence is not only for ACK, but for all (positive) responses, that
is DHCPOFFER and DHCPACK.
Fixes#27471.
DHCP static leases are looked up by the client identifier as send by
the client, while configured based on MAC. As RFC 2131 states the client
identifier is an opaque key and must not be interpreted by the server
this means that DHCP clients can (/will) also use a client identifier
which is not a MAC address. One of these clients actually is
systemd-networkd which uses an RFC 4361 by default to generate the
client identifier. For these kind of DHCP clients static leases thus
don't work because of this mismatch between configuring a MAC address
but the server matching based on client identifier. This adds a fallback
to try to look up a configured static lease based on the "chaddr" of the
DHCP message as this will always contain the MAC address of the client.
Fixes#21368
Most of the support for valgrind was under HAVE_VALGRIND_VALGRIND_H, i.e. we
would enable if the valgrind headers were found. The operations then we be
conditionalized on RUNNING_UNDER_VALGRIND.
But in a few places we had code which was conditionalized on VALGRIND, i.e. the
config option. I noticed because I compiled with -Dvalgrind=true on a machine
that didn't have valgrind.h, and the build failed because
RUNNING_UNDER_VALGRIND was not defined. My first idea was to add a check that
the header is present if the option is set, but it seems better to just remove
the option. The code to support valgrind is trivial, and if we're
!RUNNING_UNDER_VALGRIND, it has negligible cost. And the case of running under
valgrind is always some special testing/debugging mode, so we should just do
those extra steps to make valgrind output cleaner. Removing the option makes
things simpler and we don't have to think if something should be covered by the
one or the other configuration bit.
I had a vague recollection that in some places we used -Dvalgrind=true not
for valgrind support, but to enable additional cleanup under other sanitizers.
But that code would fail to build without the valgrind headers anyway, so
I'm not sure if that was still used. If there are uses like that, we can
extend the condition for cleanup_pools().
Although this slightly more verbose it makes it much easier to reason
about. The code that produces the tests heavily benefits from this.
Test lists are also now sorted by test name.
Currently, sd-dhcp-server accepts spurious client IDs, then the leases
exposed by networkd may be invalid. Let's make networkctl gracefully
show such leases.
Fixes#25984.
Yu Watanabe
Luca Boccassi
Zbigniew Jędrzejewski-Szmek
Ronan Pigott
Philipp Kern
Rene Hollander
Frantisek Sumsal
David Tardon
Daan De Meyer
Robert Meijers
Lennart Poettering
Jan Janssen
chris
chris