oss-fuzz flags this as:
==1==WARNING: MemorySanitizer: use-of-uninitialized-value
0. 0x7fce77519ca5 in ascii_is_valid systemd/src/basic/utf8.c:252:9
1. 0x7fce774d203c in ellipsize_mem systemd/src/basic/string-util.c:544:13
2. 0x7fce7730a299 in print_multiline systemd/src/shared/logs-show.c:244:37
3. 0x7fce772ffdf3 in output_short systemd/src/shared/logs-show.c:495:25
4. 0x7fce772f5a27 in show_journal_entry systemd/src/shared/logs-show.c:1077:15
5. 0x7fce772f66ad in show_journal systemd/src/shared/logs-show.c:1164:29
6. 0x4a2fa0 in LLVMFuzzerTestOneInput systemd/src/fuzz/fuzz-journal-remote.c:64:21
...
I didn't reproduce the issue, but this looks like an obvious error: the length
is specified, so we shouldn't use the string with any functions for normal
C-strings.
The primary motivation is to catch enum values created through a shift that is
too big:
../src/test/test-sizeof.c:26:29: error: left shift count >= width of type [-Werror=shift-count-overflow]
enum_with_shift = 1 << 32,
^~
cc1: some warnings being treated as errors
The compiler will now reject those.
This is an alternative to #9224.
This introduces a has_data boolean field in struct unit_files which can
be used to detect the end of the array.
Use a _cleanup_ for struct unit_files in acquire_time_data and its
callers. Code for acquire_time_data is also simplified by replacing
goto's with straight returns.
Tested: By running the commands below, also checking them under valgrind.
- build/systemd-analyze blame
- build/systemd-analyze critical-chain
- build/systemd-analyze plot
Fixes: Coverity finding CID 996464.
Let's add some protection for split horizon setups, where different
zones are visible on the same global DNS servers depending on where you
come from.
Fixes: #9196
This simplifies the code a bit and hopefully fixes Coverity finding
CID 1382966. There was not actually a resource leak here (Coverity
seemed to be confused by thinking log_oom() could actually return 0),
but the fix doesn't hurt and should make this code more resilient to
future refactorings.
Tested: builds fine, manually called scsi_id, seems to work ok.
This fixes an insecure use of tainted data as argument to functions that
allocate memory and read from files, which could be tricked into getting
networkctl to allocate a large amount of memory and fill it with file
data.
This was uncovered by Coverity. Fixes CID 1393254.
This should fix a leak of the allocated Prefix if sd_radv_prefix_new
fails for some reason.
The code was already initializing prefix to NULL and using TAKE_PTR to
return it, so only the _cleanup_ was missing.
Fixes Coverity finding CID 1382976.
This shouldn't be necessary, since read() should never return a size
larger than the size of the buffer passed in, but Coverity doesn't seem
to understand that.
We could possibly fix this with a model file for Coverity, but given
changing the code is not that much of a biggie, let's just do that
instead.
Fixes CID 996458: Overflowed or truncated value (or a value computed
from an overflowed or truncated value) `pos` used as array index.
Tested: `ninja -C build/ test`, builds without warnings, test cases pass.
The refactor in #9200 inadvertently dropped the variable assignment to
traverse the device and its hierarchy in add_matches_for_device().
This was uncovered by Coverity (CID #1393310).
Fix that by restoring the assignment.
Tested: `journalctl /dev/sda` now filters journalctl output again.
We already allowed variables to be declared in the middle of a function
(whenever a new scope was opened), so this isn't such a big change. Sometimes
we would open a scope just to work around this prohibition.
But sometimes the code can be much clearer if the variable is declared
somewhere in the middle of a scope, in particular if the declaration is
combined with initialization or acquisition of some resources. So let's allow
this, but keep things in the old style, unless there's a good reason to move
the variable declaration to a different place.
This is mostly fall-out from d1a1f0aaf0,
however some cases are older bugs.
There might be more issues lurking, this was a simple grep for "%m"
across the tree, with all lines removed that mention "errno" at all.
Previously the enumerate() callback defined for each unit type would do
two things:
1. It would create perpetual units (i.e. -.slice, system.slice, -.mount and
init.scope)
2. It would enumerate units from /proc/self/mountinfo, /proc/swaps and
the udev database
With this change these two parts are split into two seperate methods:
enumerate() now only does #2, while enumerate_perpetual() is responsible
for #1. Why make this change? Well, perpetual units should have a
slightly different effect that those found through enumeration: as
perpetual units should be up unconditionally, perpetually and thus never
change state, they should also not pull in deps by their state changing,
not even when the state is first set to active. Thus, their state is
generally initialized through the per-device coldplug() method in
similar fashion to the deserialized state from a previous run would be
put into place. OTOH units found through regular enumeration should
result in state changes (and thus pull in deps due to state changes),
hence their state should be put in effect in the catchup() method
instead. Hence, given this difference, let's also separate the
functions, so that the rule is:
1. What is created in enumerate_perpetual() should be started in
coldplug()
2. What is created in enumerate() should be started in catchup().
