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otherwise units using `DynamicUser=yes` won't be able to write the
coverage stats (currently affecting TEST-20-MAINPIDGAMES).
`DynamicUser=yes` implies `ProtectSystem=strict` and
`ProtectHome=read-only` and can't be overridden hence we need to
utilize `ReadWritePaths=` to work around that.
If the test logs contain lines like:
```
...systemd-resolved[735885]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-250.a.p/base-filesystem.c.gcda:Cannot open
```
it means we're possibly missing some coverage since gcov can't write the stats,
usually due to the sandbox being too restrictive (e.g. ProtectSystem=yes,
ProtectHome=yes) or the $BUILD_DIR being inaccessible to non-root users.
Every time I need it I have to first relearn autopkgtest and find where
all the necessary stuff lives, so let's document it somewhere close to
systemd for (at least) future me.
In cbcdcaaa0e ("Add support for conditions on the machines firmware")
a new Firmware= directive was added for .netdev and .network files.
While it was also documented to work on .link files, in actual fact the
support was missing. Add that one extra line to make it work, and also
update the fuzzer directives.
Add the "Isolated" parameter in the *.network file, e.g.,
[Bridge]
Isolated=true|false
When the Isolated parameter is true, traffic coming out of this port
will only be forward to other ports whose Isolated parameter is false.
When Isolated is not specified, the port uses the kernel default
setting (false).
The "Isolated" parameter was introduced in Linux 4.19.
See man bridge(8) for more details.
But even though the kernel and bridge/iproute2 recognize the "Isolated"
parameter, systemd-networkd did not have a way to set it.
The warning is correct, since we don't inherit the necessary
unittest.TestCase class, but that's on purpose, since the Utilities
class is not supposed to be instantiated on its own, but should
complement other classes' definitions which do inherit from the
unittest.TestCase class.
It currently works because `\(` and `\)` are not valid escape sequences,
so they're not treated differently. Using raw strings (or double
backslashes) is a more correct solution.
Multiline comments are converted to docstrings only when they're the
first statement in a function/method. Even though they're still a no-op
otherwise, let's use "true" comments to make pylint happy.
to let them use reproducible identifiers, which should make it possible
to really use files copied from OSS-Fuzz to reproduce issues on
GHActions and locally. Prompted by https://github.com/systemd/systemd/pull/22365
If we're built with `-Dportable=false`, the portable profiles won't get
installed into the image. Since we need only the profile files and
nothing else, let's copy them into the image explicitly in such case.
/etc/bash.bashrc appears to be Debian-specific[0] (or specific to bash
versions compiled with -DSYS_BASHRC), which doesn't seem to be the case
for C8S. Let's use ~/.bashrc instead to make the CIs happy again.
[0] https://sources.debian.org/src/bash/5.1-6/debian/README/#L50-L56
Turns out that part of systemd isn't covered by any fuzz targets and
that's not ideal considering that it parses data sent remotely. The
fuzzer triggers an infinite loop in lease_parse_routes as soon as it
starts so it seems to be working :-)
```
INFO: Running with entropic power schedule (0xFF, 100).
INFO: Seed: 23620602
INFO: Loaded 2 modules (182073 inline 8-bit counters): 176548 [0x7fdf511fc8d0, 0x7fdf51227a74), 5525 [0x5f6ef0, 0x5f8485),
INFO: Loaded 2 PC tables (182073 PCs): 176548 [0x7fdf51227a78,0x7fdf514d94b8), 5525 [0x5f8488,0x60ddd8),
./build/fuzz-dhcp-client: Running 1 inputs 1 time(s) each.
Running: test/fuzz/fuzz-dhcp-client/timeout-ed34161922c7075c4773f2ada3dee8685d220980
ALARM: working on the last Unit for 31 seconds
and the timeout value is 30 (use -timeout=N to change)
==80731== ERROR: libFuzzer: timeout after 31 seconds
#0 0x51b32e in __sanitizer_print_stack_trace (/home/vagrant/systemd/build/fuzz-dhcp-client+0x51b32e)
#1 0x4689e9 in fuzzer::PrintStackTrace() (/home/vagrant/systemd/build/fuzz-dhcp-client+0x4689e9)
#2 0x44a0f4 in fuzzer::Fuzzer::StaticAlarmCallback() (/home/vagrant/systemd/build/fuzz-dhcp-client+0x44a0f4)
#3 0x7fdf4f8b474f (/lib64/libc.so.6+0x4274f)
#4 0x465fee in __sanitizer_cov_trace_const_cmp4 (/home/vagrant/systemd/build/fuzz-dhcp-client+0x465fee)
#5 0x57eee5 in lease_parse_routes /home/vagrant/systemd/build/../src/libsystemd-network/sd-dhcp-lease.c:495:23
#6 0x57baf3 in dhcp_lease_parse_options /home/vagrant/systemd/build/../src/libsystemd-network/sd-dhcp-lease.c:701:21
#7 0x572450 in parse_options /home/vagrant/systemd/build/../src/libsystemd-network/dhcp-option.c:348:33
#8 0x571cea in dhcp_option_parse /home/vagrant/systemd/build/../src/libsystemd-network/dhcp-option.c:381:21
#9 0x559a01 in client_handle_offer /home/vagrant/systemd/build/../src/libsystemd-network/sd-dhcp-client.c:1543:13
#10 0x5592bd in LLVMFuzzerTestOneInput /home/vagrant/systemd/build/../src/libsystemd-network/fuzz-dhcp-client.c:78:9
#11 0x44a379 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/home/vagrant/systemd/build/fuzz-dhcp-client+0x44a379)
#12 0x42ae1f in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) (/home/vagrant/systemd/build/fuzz-dhcp-client+0x42ae1f)
#13 0x432ade in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/home/vagrant/systemd/build/fuzz-dhcp-client+0x432ade)
#14 0x421f86 in main (/home/vagrant/systemd/build/fuzz-dhcp-client+0x421f86)
#15 0x7fdf4f89f55f in __libc_start_call_main (/lib64/libc.so.6+0x2d55f)
#16 0x7fdf4f89f60b in __libc_start_main@GLIBC_2.2.5 (/lib64/libc.so.6+0x2d60b)
#17 0x421fd4 in _start (/home/vagrant/systemd/build/fuzz-dhcp-client+0x421fd4)
SUMMARY: libFuzzer: timeout
```
