We would read (-1), and then add 1 to it, call message_peek_body(..., 0, ...),
and when trying to make use of the data.
The fuzzer test case is just for one site, but they all look similar.
v2: fix two UINT8_MAX/UINT32_MAX mismatches founds by LGTM
We copied part of the string into a buffer that was off by two.
If the element signature had length one, we'd copy 0 bytes and crash when
looking at the "first" byte. Otherwise, we would crash because strncpy would
not terminate the string.
This is similar to the grandparent commit 'fix calculation of offsets table',
except that now the change is for array elements. Same story as before: we need
to make sure that the offsets increase enough taking alignment into account.
While at it, rename 'p' to 'previous' to match similar code in other places.
The offsets specify the ends of variable length data. We would trust the
incoming data, putting the offsets specified in our message
into the offsets tables after doing some superficial verification.
But when actually reading the data we apply alignment, so we would take
the previous offset, align it, making it bigger then current offset, and
then we'd try to read data of negative length.
In the attached example, the message specifies the following offsets:
[1, 4]
but the alignment of those items is
[1, 8]
so we'd calculate the second item as starting at 8 and ending at 4.
The alternative would be to treat gvariant and !gvariant messages differently.
But this is a problem because we check signatures is variuos places before we
have an actual message, for example in sd_bus_add_object_vtable(). It seems
better to treat things consistent (i.e. follow the lowest common denominator)
and disallow empty structures everywhere.
We didn't free one of the fields in two of the places.
$ valgrind --show-leak-kinds=all --leak-check=full \
build/fuzz-bus-message \
test/fuzz/fuzz-bus-message/leak-c09c0e2256d43bc5e2d02748c8d8760e7bc25d20
...
==14457== HEAP SUMMARY:
==14457== in use at exit: 3 bytes in 1 blocks
==14457== total heap usage: 509 allocs, 508 frees, 51,016 bytes allocated
==14457==
==14457== 3 bytes in 1 blocks are definitely lost in loss record 1 of 1
==14457== at 0x4C2EBAB: malloc (vg_replace_malloc.c:299)
==14457== by 0x53AFE79: strndup (in /usr/lib64/libc-2.27.so)
==14457== by 0x4F52EB8: free_and_strndup (string-util.c:1039)
==14457== by 0x4F8E1AB: sd_bus_message_peek_type (bus-message.c:4193)
==14457== by 0x4F76CB5: bus_message_dump (bus-dump.c:144)
==14457== by 0x108F12: LLVMFuzzerTestOneInput (fuzz-bus-message.c:24)
==14457== by 0x1090F7: main (fuzz-main.c:34)
==14457==
==14457== LEAK SUMMARY:
==14457== definitely lost: 3 bytes in 1 blocks
v2: fix error in free_and_strndup()
When the orignal and copied message were the same, but shorter than specified
length l, memory read past the end of the buffer would be performed. A test
case is included: a string that had an embedded NUL ("q\0") is used to replace
"q".
v3: Fix one more bug in free_and_strndup and add tests.
v4: Some style fixed based on review, one more use of free_and_replace, and
make the tests more comprehensive.
318/365 fuzz-bus-message:crash-26bba7182dedc8848939931d9fcefcb7922f2e56:address OK 0.03 s
319/365 fuzz-bus-message:crash-29ed3c202e0ffade3cad42c8bbeb6cc68a21eb8e:address OK 0.03 s
320/365 fuzz-bus-message:crash-b88ad9ecf4aacf4a0caca5b5543953265367f084:address OK 0.03 s
321/365 fuzz-bus-message:crash-c1b37b4729b42c0c05b23cba4eed5d8102498a1e:address OK 0.03 s
322/365 fuzz-bus-message:crash-d8f3941c74219b4c03532c9b244d5ea539c61af5:address OK 0.03 s
323/365 fuzz-bus-message:crash-e1b811da5ca494e494b77c6bd8e1c2f2989425c5:address OK 0.03 s
324/365 fuzz-bus-message:leak-c09c0e2256d43bc5e2d02748c8d8760e7bc25d20:address OK 0.04 s
325/365 fuzz-bus-message:message1:address OK 0.03 s
326/365 fuzz-bus-message:timeout-08ee8f6446a4064db064e8e0b3d220147f7d0b5b:address OK 0.03 s
327/365 fuzz-dhcp-server:discover-existing:address OK 0.04 s
328/365 fuzz-dhcp-server:discover-new:address OK 0.03 s
329/365 fuzz-dhcp-server:release:address OK 0.04 s
330/365 fuzz-dhcp-server:request-existing:address OK 0.03 s
331/365 fuzz-dhcp-server:request-new:address OK 0.03 s
332/365 fuzz-dhcp-server:request-reboot:address OK 0.03 s
333/365 fuzz-dhcp-server:request-renew:address OK 0.03 s
334/365 fuzz-dns-packet:issue-7888:address OK 0.03 s
335/365 fuzz-dns-packet:oss-fuzz-5465:address OK 0.03 s
336/365 fuzz-journal-remote:crash-5a8f03d4c3a46fcded39527084f437e8e4b54b76:address OK 0.06 s
337/365 fuzz-journal-remote:crash-96dee870ea66d03e89ac321eee28ea63a9b9aa45:address OK 0.04 s
338/365 fuzz-journal-remote:invalid-ts.txt:address OK 0.04 s
339/365 fuzz-journal-remote:oss-fuzz-8659:address OK 0.06 s
340/365 fuzz-journal-remote:oss-fuzz-8686:address OK 0.04 s
341/365 fuzz-journal-remote:sample.txt:address OK 0.07 s
342/365 fuzz-unit-file:directives.service:address OK 0.03 s
343/365 fuzz-unit-file:empty.scope:address OK 0.04 s
344/365 fuzz-unit-file:machine.slice:address OK 0.03 s
345/365 fuzz-unit-file:oss-fuzz-6884:address OK 0.05 s
346/365 fuzz-unit-file:oss-fuzz-6885:address OK 0.03 s
347/365 fuzz-unit-file:oss-fuzz-6886:address OK 0.04 s
348/365 fuzz-unit-file:oss-fuzz-6892:address OK 0.03 s
349/365 fuzz-unit-file:oss-fuzz-6897:address OK 0.05 s
350/365 fuzz-unit-file:oss-fuzz-6897-evverx:address OK 0.04 s
351/365 fuzz-unit-file:oss-fuzz-6908:address OK 0.05 s
352/365 fuzz-unit-file:oss-fuzz-6917:address OK 0.06 s
353/365 fuzz-unit-file:oss-fuzz-6977:address OK 0.08 s
354/365 fuzz-unit-file:oss-fuzz-6977-unminimized:address OK 0.10 s
355/365 fuzz-unit-file:oss-fuzz-7004:address OK 0.03 s
356/365 fuzz-unit-file:oss-fuzz-8064:address OK 0.03 s
357/365 fuzz-unit-file:oss-fuzz-8827:address OK 0.50 s
358/365 fuzz-unit-file:proc-sys-fs-binfmt_misc.automount:address OK 0.03 s
359/365 fuzz-unit-file:syslog.socket:address OK 0.03 s
360/365 fuzz-unit-file:systemd-ask-password-console.path:address OK 0.03 s
361/365 fuzz-unit-file:systemd-machined.service:address OK 0.03 s
362/365 fuzz-unit-file:systemd-resolved.service:address OK 0.03 s
363/365 fuzz-unit-file:systemd-tmpfiles-clean.timer:address OK 0.03 s
364/365 fuzz-unit-file:timers.target:address OK 0.03 s
365/365 fuzz-unit-file:var-lib-machines.mount:address OK 0.04 s
This gives us slightly nicer coverage in the normal test run.
When in a git repo, git ls-files is used to get a list of files known to git.
This mirrors what update-man-rules does for man files. Only looking at files
known to git makes it easier to not forget to commit the test file to git,
and also makes bisecting easier if some files are left in repo.
When outside of a git repo, we expect to be unpacked from a tarball, so just
using all files reported by ls is OK.
There isn't really much need to keep them separate. Anything which is a good
corpus entry can be used as a smoke test, and anything which which is a
regression test can just as well be inserted into the corpus.
The only functional difference from this patch (apart from different paths in
output) is that the regression tests are now zipped together with the rest of
the corpus.
$ meson configure build -Dslow-tests=true && ninja -C build test
...
307/325 fuzz-dns-packet:issue-7888:address OK 0.06 s
308/325 fuzz-dns-packet:oss-fuzz-5465:address OK 0.04 s
309/325 fuzz-journal-remote:crash-5a8f03d4c3a46fcded39527084f437e8e4b54b76:address OK 0.07 s
310/325 fuzz-journal-remote:crash-96dee870ea66d03e89ac321eee28ea63a9b9aa45:address OK 0.05 s
311/325 fuzz-journal-remote:oss-fuzz-8659:address OK 0.05 s
312/325 fuzz-journal-remote:oss-fuzz-8686:address OK 0.07 s
313/325 fuzz-unit-file:oss-fuzz-6884:address OK 0.06 s
314/325 fuzz-unit-file:oss-fuzz-6885:address OK 0.05 s
315/325 fuzz-unit-file:oss-fuzz-6886:address OK 0.05 s
316/325 fuzz-unit-file:oss-fuzz-6892:address OK 0.05 s
317/325 fuzz-unit-file:oss-fuzz-6897:address OK 0.05 s
318/325 fuzz-unit-file:oss-fuzz-6897-evverx:address OK 0.06 s
319/325 fuzz-unit-file:oss-fuzz-6908:address OK 0.07 s
320/325 fuzz-unit-file:oss-fuzz-6917:address OK 0.07 s
321/325 fuzz-unit-file:oss-fuzz-6977:address OK 0.13 s
322/325 fuzz-unit-file:oss-fuzz-6977-unminimized:address OK 0.12 s
323/325 fuzz-unit-file:oss-fuzz-7004:address OK 0.05 s
324/325 fuzz-unit-file:oss-fuzz-8064:address OK 0.05 s
325/325 fuzz-unit-file:oss-fuzz-8827:address OK 0.52 s
=0 ndisc_router_parse (rt=0x60d000000110) at ../src/libsystemd-network/ndisc-router.c:126
=1 0x000055555558dc67 in ndisc_handle_datagram (nd=0x608000000020, rt=0x60d000000110) at ../src/libsystemd-network/sd-ndisc.c:170
=2 0x000055555558e65d in ndisc_recv (s=0x611000000040, fd=4, revents=1, userdata=0x608000000020) at ../src/libsystemd-network/sd-ndisc.c:233
=3 0x00007ffff63913a8 in source_dispatch (s=0x611000000040) at ../src/libsystemd/sd-event/sd-event.c:3042
=4 0x00007ffff6395eab in sd_event_dispatch (e=0x617000000080) at ../src/libsystemd/sd-event/sd-event.c:3455
=5 0x00007ffff6396b12 in sd_event_run (e=0x617000000080, timeout=18446744073709551615) at ../src/libsystemd/sd-event/sd-event.c:3512
=6 0x0000555555583f5c in LLVMFuzzerTestOneInput (data=0x6060000000e0 "\206", size=53) at ../src/fuzz/fuzz-ndisc-rs.c:422
=7 0x0000555555586356 in main (argc=2, argv=0x7fffffffe3d8) at ../src/fuzz/fuzz-main.c:33
Allows configuring the watchdog signal (with a default of SIGABRT).
This allows an alternative to SIGABRT when coredumps are not desirable.
Appropriate references to SIGABRT or aborting were renamed to reflect
more liberal watchdog signals.
Closes#8658
When parsing and installing binaries mentioned in Exec*= lines the
5ed0dcf4d5 commit added parsing logic to drop
prefixes, including handling duplicate exclamation marks. But this did not
handle arbitrary combination of multiple prefixes, ie. StartExec=+-/bin/sh was
parsed as -/bin/sh which then would fail to install.
Instead of using egrep and shell replacements, replace both with sed command
that does it all. This sed script extract a group of characters starting with a
/ up to the first space (if any) after the equals sign. This correctly handles
existing non-prefixed, prefixed, multiple-prefixed commands.
About half commands seem to repeat themself, thus sort -u cuts the list of
binaries to install about in half.
To validate change of behaviour both old and new functions were modified to
echo parsed binaries into separate files, and then diffed. The incorrect
-/bin/sh was missing in the new output.
Without this patch tests fail on default Ubuntu installs.
Back in 08318a2c5a, value "false" was enabled for
'-Dtests=', but various tests were not conditionalized properly. So even with
-Dtests=false -Dslow-tests=false we'd run 120 tests. Let's make this consistent.
... when no mount options are passed.
Change the code, to avoid the following failure in the newly added tests:
exec-temporaryfilesystem-rw.service: Executing: /usr/bin/sh -x -c
'[ "$(stat -c %a /var)" == 755 ]'
++ stat -c %a /var
+ '[' 1777 == 755 ']'
Received SIGCHLD from PID 30364 (sh).
Child 30364 (sh) died (code=exited, status=1/FAILURE)
(And I spotted an opportunity to use TAKE_PTR() at the end).
We can't remount the underlying superblocks, if we are inside a user
namespace and running Linux <= 4.17. We can only change the per-mount
flags (MS_REMOUNT | MS_BIND).
This type of mount() call can only change the per-mount flags, so we
don't have to worry about passing the right string options now.
Fixes#9914 ("Since 1beab8b was merged, systemd has been failing to start
systemd-resolved inside unprivileged containers" ... "Failed to re-mount
'/run/systemd/unit-root/dev' read-only: Operation not permitted").
> It's basically my fault :-). I pointed out we could remount read-only
> without MS_BIND when reviewing the PR that added TemporaryFilesystem=,
> and poettering suggested to change PrivateDevices= at the same time.
> I think it's safe to change back, and I don't expect anyone will notice
> a difference in behaviour.
>
> It just surprised me to realize that
> `TemporaryFilesystem=/tmp:size=10M,ro,nosuid` would not apply `ro` to the
> superblock (underlying filesystem), like mount -osize=10M,ro,nosuid does.
> Maybe a comment could note the kernel version (v4.18), that lets you
> remount without MS_BIND inside a user namespace.
This makes the code longer and I guess this function is still ugly, sorry.
One obstacle to cleaning it up is the interaction between
`PrivateDevices=yes` and `ReadOnlyPaths=/dev`. I've added a test for the
existing behaviour, which I think is now the correct behaviour.
A follow-up for commit 9d874aec45.
This patch makes "path" parameter mandatory in fd_set_*() helpers removing the
need to use fd_get_path() when NULL was passed. The caller is supposed to pass
the fd anyway so assuming that it also knows the path should be safe.
Actually, the only case where this was useful (or used) was when we were
walking through directory trees (in item_do()). But even in those cases the
paths could be constructed trivially, which is still better than relying on
fd_get_path() (which is an ugly API).
A very succinct test case is also added for 'z/Z' operators so the code dealing
with recursive operators is tested minimally.
The usage of an initrd made TEST-09-ISSUE-2691 more likely to fail with
a timeout, so increase the timeout by 90s and adjust TimeoutStopSec=
accordingly.
Not all distros support booting without an initrd. E.g. the Debian
kernel builds ext4 as a module and so relies on an initrd to
successfully start the QEMU-based images.
Lennart Poettering