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We nowadays rename our child processes, hence argv[] will be clobbered,
let's hence copy the device path to dynamic memory before forking.
This is fall-out from 60ffa37a65 since we
now a lot more often end up overriding the argv[] buffer than before,
simple because we know what to override.
These kind of bugs kinda suck. THere are only two options here: stop
overriding argv[] for all cases (or just these cases) or explicitly
copying out everything we need in child processes before forking. With
this patch I opt for the latter, though I am not 100% convinced this is
a great solution. Just a better solution than everything else, i.e.
allowing argv[] to remain out of sync with what others see.
Fixes: #12135
Apparently by the C standard "int" bitfields can have any signedness
(unlike non-bitfield declarations which are "signed" if the signedness
is not specified).
Let's fix the LGTM warning about this hence and be explicit that we mean
"signed" here.
Some chattrs only work sensible if you set them right after opening a
file for create (think: FS_NOCOW_FL). Others only work when they are
applied when the file is fully written (think: FS_IMMUTABLE_FL). Let's
take that into account when copying files and applying a chattr to them.
With new LUKS2 header format it is possible to use Argon2 key derivation
function. This function is "memory-hard" hence keyslot unlocking can
potentially use a lot of RAM as this increases resistance to massively
parallel GPU based password cracking.
However, when multiple systemd-cryptsetup binaries run at the same
time it is very likely that system using Argon2 (e.g. Fedora 30)
will encounter memory-pressure during early boot, following OOM killing
spree.
This patch aims to lower the damage done by OOM killer and sets OOMScore
for systemd-cryptsetup units to 500. Hopefully OOM killer will then
shoot us down and leave rest of the system services alone.
We are about to add system calls (rseq()) not available on old
libseccomp/old kernels, and hence we need to be permissive when parsing
our definitions.
With assertions disabled, we'd get a bunch of warnings that really bring no
value. With this change, a default meson build with -Db_ndebug=true generates
no warnings.
I couldn't figure out what is going on here, because LTO inlines everything and
then the backtrace reported a different spot. But when compiled with NDEBUG but
no LTO, it's fairly obvious ;)
C.f. #12008.
When compiled with -DNDEBUG, we get warnings about set-but-unused variables.
In general, it's not something we care about, but since removing those
variables arguably makes the code nicer, let's just to it in this case.
Let's be helpful to static analyzers which care about whether we
knowingly ignore return values. We do in these cases, since they are
usually part of error paths.
Let's unify the two similar code paths to watch /run/systemd/journal.
The code in manager.c is similar, but it uses mkdir_p_label(), and unifying
that would be too much trouble, so let's just adjust the error messages to
be the same.
CID #1400224.
