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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.
Coverity is unhappy because we use "line" in the assert that checks
the return value. It doesn't matter much, but let's clean this up.
Also, let's not assume that /proc/cmdline contains anything.
CID #1400219.
When running in Fedora "mock", / is a tmpfs and /home is not mounted. The test
assumes that /home will be a tmpfs only and only if we can unshare. Obviously,
this does not hold in this case, because unsharing is not possible, but /home
is still a tmpfs. Let's just skip the test, since it's fully legitimate to
mount either or both of / and /home as tmpfs.
test_exec_ambientcapabilities: exec-ambientcapabilities-nobody.service: exit status 0, expected 1
Sometimes we get just the last line, for example from the failure summary,
so make it as useful as possible.
This adds some extra paranoia: when we recursively chown a directory for
use with DynamicUser=1 services we'll now drop suid/sgid from all files
we chown().
Of course, such files should not exist in the first place, and noone
should get access to those dirs who isn't root anyway, but let's better
be safe than sorry, and drop everything we come across.
