Files placed in /EFI/Linux/UKI.efi.extra.d/ and /loader/addons/ are
opened and verified using the LoadImage protocol, and will thus get
verified via shim/firmware.
If they are valid signed PE files, the .cmdline section will be
extracted and appended. If there are multiple addons in each directory,
they will be parsed in alphanumerical order.
Optionally the .uname sections are also matched if present, so
that they can be used to filter out addons as well if needed, and only
addons that correspond exactly to the UKI being loaded are used.
It is recommended to also always add a .sbat section to addons, so
that they can be mass-revoked with just a policy update.
The files must have a .addon.efi suffix.
Files in the per-UKI directory are parsed, sorted, measured and
appended first. Then, files in the generic directory are processed.
The announced new behavior for OnFailure= never worked properly,
and we've fixed the document instead in #27675.
Therefore, let's get rid of the unused logic completely. More at #27594.
The to-be-added RestartMode= option should cover the use case hopefully.
Closes#27594
If we fail to combine the new entry with a previous one, or update it in
the hashmap, we might later on attempt a double-free:
=================================================================
==10==ERROR: AddressSanitizer: attempting double-free on 0x611000039fc0 in thread T0:
SCARINESS: 42 (double-free)
#0 0x4a0962 in __interceptor_free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:52:3
#1 0x7f55e431d9f2 in _hashmap_clear /work/build/../../src/systemd/src/basic/hashmap.c:927:33
#2 0x7f55e431d4c8 in _hashmap_free /work/build/../../src/systemd/src/basic/hashmap.c:896:17
#3 0x4de1de in ordered_hashmap_free_free_free /work/build/../../src/systemd/src/basic/hashmap.h:120:24
#4 0x4de1de in ordered_hashmap_free_free_freep /work/build/../../src/systemd/src/basic/hashmap.h:434:1
#5 0x4de1de in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-catalog.c:26:1
#6 0x4de8b8 in NaloFuzzerTestOneInput (/build/fuzz-catalog+0x4de8b8)
#7 0x4fd8c3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#8 0x4fd0aa in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:514:3
#9 0x4fe779 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#10 0x4ff445 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, std::__Fuzzer::allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:895:5
#11 0x4ee7af in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#12 0x4ef078 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#13 0x4deb35 in main (/build/fuzz-catalog+0x4deb35)
#14 0x7f55e3a32082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
#15 0x41f7cd in _start (/build/fuzz-catalog+0x41f7cd)
DEDUP_TOKEN: __interceptor_free--_hashmap_clear--_hashmap_free
0x611000039fc0 is located 0 bytes inside of 224-byte region [0x611000039fc0,0x61100003a0a0)
freed by thread T0 here:
#0 0x4a0962 in __interceptor_free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:52:3
#1 0x7f55e451493d in freep /work/build/../../src/systemd/src/basic/alloc-util.h:107:22
#2 0x7f55e451493d in finish_item /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:187:1
#3 0x7f55e4513e56 in catalog_import_file /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:313:45
#4 0x4de1be in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-catalog.c:23:16
#5 0x4de8b8 in NaloFuzzerTestOneInput (/build/fuzz-catalog+0x4de8b8)
#6 0x4fd8c3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#7 0x4fd0aa in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:514:3
#8 0x4fe779 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#9 0x4ff445 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, std::__Fuzzer::allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:895:5
#10 0x4ee7af in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#11 0x4ef078 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#12 0x4deb35 in main (/build/fuzz-catalog+0x4deb35)
#13 0x7f55e3a32082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
DEDUP_TOKEN: __interceptor_free--freep--finish_item
previously allocated by thread T0 here:
#0 0x4a0c06 in __interceptor_malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:69:3
#1 0x4de539 in malloc (/build/fuzz-catalog+0x4de539)
#2 0x7f55e42bf96b in memdup /work/build/../../src/systemd/src/basic/alloc-util.c:16:15
#3 0x7f55e451475d in finish_item /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:176:28
#4 0x7f55e4513e56 in catalog_import_file /work/build/../../src/systemd/src/libsystemd/sd-journal/catalog.c:313:45
#5 0x4de1be in LLVMFuzzerTestOneInput /work/build/../../src/systemd/src/fuzz/fuzz-catalog.c:23:16
#6 0x4de8b8 in NaloFuzzerTestOneInput (/build/fuzz-catalog+0x4de8b8)
#7 0x4fd8c3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#8 0x4fd0aa in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool, bool*) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:514:3
#9 0x4fe779 in fuzzer::Fuzzer::MutateAndTestOne() /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:757:19
#10 0x4ff445 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, std::__Fuzzer::allocator<fuzzer::SizedFile> >&) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:895:5
#11 0x4ee7af in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:912:6
#12 0x4ef078 in LLVMFuzzerRunDriver /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:925:10
#13 0x4deb35 in main (/build/fuzz-catalog+0x4deb35)
#14 0x7f55e3a32082 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId: 1878e6b475720c7c51969e69ab2d276fae6d1dee)
DEDUP_TOKEN: __interceptor_malloc--malloc--memdup
SUMMARY: AddressSanitizer: double-free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:52:3 in __interceptor_free
Found by Nallocfuzz.
In order to ensure addons can always be revoked via SBAT, and it is not
left out by mistake, have a default metadata entry if none is specified
by the caller.
https://github.com/rhboot/shim/blob/main/SBAT.md
We'll use it from the stub to validate files. Requires Shim 5.18.
By default, Shim uninstalls its protocol when calling StartImage(),
so when loading systemd-boot via shim and then loading an UKI, the
UKI's sd-stub will no longer be able to use the shim verification
protocol by default.
Notifications from /proc/self/mountinfo are async, so if we stop a
service (and while doing so get rid of the credentials mount point of
it), then it will take a while until the notification reaches us and we
actually scan the table again. In particular as we nowadays ratelimit
notifications on the table, since it's so inefficient. And as I learnt
the ratelimiting is actually quite regularly hit during shutdown, where
a flurry of umount events are genreated. Hence, let's check if a mount
point is actually a mountpoint before trying to unmount it. And if it
isn't let's wait for the notification to come in.
(This race might be triggred not just by us on ourselves btw: there are
other daemons that unmount stuff when stopping where the race also
exists, but might simply be harder to trigger: if during service
shutdown these services remove some mount then they might collide with
us doing the same. After all, we have the rule to unmount everything
mounted automatically for you during shutdown.)
In the long run we should also start making us of this when it becomes
available: https://github.com/util-linux/util-linux/issues/2132 With
that we can make issues like this go away entirely from our side of
things at least.
Fixes: #25527
Just some simple refactoring: let's split out network dep generation
into its own function mount_add_default_network_dependencies().
This way mount_add_default_dependencies() only does preparatory stuff,
and then calls both mount_add_default_network_dependencies() and
mount_add_default_ordering_dependencies() with that, making things
nicely symmetric.
The per-unit credentials mounts might show up for any kind of service,
including very very early ones. Hence let's not order them after
local-fs-pre.target, because otherwise we might trigger cyclic deps of
services that want to plug before that but still use credentials.
If we're doing a daemon-reload, we'll be going from TIMER_DEAD => TIMER_WAITING,
so we won't use inactive_exit_timestamp because TIMER_DEAD != UNIT_ACTIVE, even
though inactive_exit_timestamp is serialized/deserialized and will be valid after
the daemon-reload.
This issue can lead to timers never firing as we'll always calculate the next
elapse based on the current realtime on daemon-reload, so if daemon-reload happens
often enough, the elapse interval will be moved into the future every time, which
means the timer will never trigger.
To fix the issue, let's always use inactive_exit_timestamp if it is set, and only
fall back to the current realtime if it is not set.
David Tardon
Luca Boccassi
Mike Yuan
Daan De Meyer
Frantisek Sumsal
Yu Watanabe
Lennart Poettering