The desktop file specification allows entries like ";;;;;;", full of empty strings.
But looking at the actual list of supported keys [1], empty entries are meaningless
(unless we would allow e.g. the desktop name to be the empty string. But that doesn't
seem very useful either). So let's just simplify our life and skip any empty substrings
entirely.
This would also resolve the fuzzer case:
$ valgrind build/fuzz-xdg-desktop test/fuzz/fuzz-xdg-desktop/oss-fuzz-22812
test/fuzz/fuzz-xdg-desktop/oss-fuzz-22812... ok
==2899241== HEAP SUMMARY:
==2899241== in use at exit: 0 bytes in 0 blocks
==2899241== total heap usage: 484,385 allocs, 484,385 frees, 12,411,330 bytes allocated
↓
==2899650== HEAP SUMMARY:
==2899650== in use at exit: 0 bytes in 0 blocks
==2899650== total heap usage: 1,325 allocs, 1,325 frees, 1,463,602 bytes allocated
The fuzzer test case has a giant line with ";;;;;;;;;;;..." which is turned into
a strv of empty strings. Unfortunately, when pushing each string, strv_push() needs
to walk the whole array, which leads to quadratic behaviour. So let's use
greedy_allocation here and also keep location in the string to avoid iterating.
build/fuzz-xdg-desktop test/fuzz/fuzz-xdg-desktop/oss-fuzz-22812 51.10s user 0.01s system 99% cpu 51.295 total
↓
build/fuzz-xdg-desktop test/fuzz/fuzz-xdg-desktop/oss-fuzz-22812 0.07s user 0.01s system 96% cpu 0.083 total
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22812.
Other minor changes:
- say "was already defined" instead of "defined multiple times" to make it
clear that we're ignoring this second definition, and not all definitions
of the key
- unescaping needs to be done also for the last entry
When a command asks to load a unit directly and it is in state
UNIT_NOT_FOUND, and the cache is outdated, we refresh it and
attempto to load again.
Use the same logic when building up a transaction and a dependency in
UNIT_NOT_FOUND state is encountered.
Update the unit test to exercise this code path.
While investigating https://github.com/systemd/systemd/issues/16356, I
discovered that networkd stops the radv service before adding or updating
prefixes and then starts it again. This causes networkd to send an RA with
a router lifetime of zero, causing the routes to flap on systems receiving
the RA for a fraction of a second before radv is started again and proper
RAs are sent. That has the potential to cause issues with latency-sensitive
traffic like gaming or VoIP. This patch adds a boolean argument to the
sd_radv_stop() function to control this behavior. The zero lifetime RA is
still sent whenever radv is actually being stopped, but when it is being
restarted for a prefix update (from networkd-dhcp6.c), the final RA is no
longer sent to avoid the route flapping.
Yu Watanabe