We parse the pack-name chunk as a series of NUL-terminated strings. But
since we don't look at the chunk size, there's nothing to guarantee that
we don't parse off the end of the chunk (or even off the end of the
mapped file).
We can record the length, and then as we parse make sure that we never
walk past it.
The new test exercises the case, though note that it does not actually
segfault before this patch. It hits a NUL byte somewhere in one of the
other chunks, and comes up with a garbage pack name. You could construct
one that reads out-of-bounds (e.g., a PNAM chunk at the end of file),
but this case is simple and sufficient to check that we detect the
problem.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We use bsearch_hash() to look up items in the oid index of a
commit-graph. It also has a fanout table to reduce the initial range in
which we'll search. But since the fanout comes from the on-disk file, a
corrupted or malicious file can cause us to look outside of the
allocated index memory.
One solution here would be to pass the total table size to
bsearch_hash(), which could then bounds check the values it reads from
the fanout. But there's an inexpensive up-front check we can do, and
it's the same one used by the midx and pack idx code (both of which
likewise have fanout tables and use bsearch_hash(), but are not affected
by this bug):
1. We can check the value of the final fanout entry against the size
of the table we got from the index chunk. These must always match,
since the fanout is just slicing up the index.
As a side note, the midx and pack idx code compute it the other
way around: they use the final fanout value as the object count, and
check the index size against it. Either is valid; if they
disagree we cannot know which is wrong (a corrupted fanout value,
or a too-small table of oids).
2. We can quickly scan the fanout table to make sure it is
monotonically increasing. If it is, then we know that every value
is less than or equal to the final value, and therefore less than
or equal to the table size.
It would also be sufficient to just check that each fanout value is
smaller than the final one, but the midx and pack idx code both do
a full monotonicity check. It's the same cost, and it catches some
other corruptions (though not all; the checks done by "commit-graph
verify" are more complete but more expensive, and our goal here is
to be fast and memory-safe).
There are two new tests. One just checks the final fanout value (this is
the mirror image of the "too small oid lookup" case added for the midx
in the previous commit; it's flipped here because commit-graph considers
the oid lookup chunk to be the source of truth).
The other actually creates a fanout with many out-of-bounds entries, and
prior to this patch, it does cause the segfault you'd expect. But note
that the error is not "your fanout entry is out-of-bounds", but rather
"fanout value out of order". That's because we leave the final fanout
value in place (to get past the table size check), making the index
non-monotonic (the second-to-last entry is big, but the last one must
remain small to match the actual table).
We need adjustments to a few existing tests, as well:
- an earlier test in t5318 corrupts the fanout and runs "commit-graph
verify". Its message is now changed, since we catch the problem
earlier (during the load step, rather than the careful validation
step).
- in t5324, we test that "commit-graph verify --shallow" does not do
expensive verification on the base file of the chain. But the
corruption it uses (munging a byte at offset 1000) happens to be in
the middle of the fanout table. And now we detect that problem in
the cheaper checks that are performed for every part of the graph.
We'll push this back to offset 1500, which is only caught by the
more expensive checksum validation.
Likewise, there's a later test in t5324 which munges an offset 100
bytes into a file (also in the fanout table) that is referenced by
an alternates file. So we now find that corruption during the load
step, rather than the verification step. At the very least we need
to change the error message (like the case above in t5318). But it
is probably good to make sure we handle all parts of the
verification even for alternate graph files. So let's likewise
corrupt byte 1500 and make sure we found the invalid checksum.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When reading an on-disk multi-pack-index, we take the number of objects
in the midx from the final value of the fanout table. But we just
blindly assume that the chunk containing the actual oid entries is the
correct size. This can lead to us reading out-of-bounds memory if the
lookup chunk is too small (or if the fanout is corrupted; when they
don't agree we cannot tell which one is wrong).
Note that we bump the assignment of m->num_objects into the fanout
parser callback, so that it's set when we parse the lookup table
(otherwise we'd have to manually record the lookup table size and check
it later).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
We load the oid fanout chunk with pair_chunk(), which means we never see
the size of the chunk. We just assume the on-disk file uses the
appropriate size, and if it's too small we'll access random memory.
It's easy to check this up-front; the fanout always consists of 256
uint32's, since it is a fanout of the first byte of the hash pointing
into the oid index. These parameters can't be changed without
introducing a new chunk type.
This matches the similar check in the midx OIDF chunk (but note that
rather than checking for the error immediately, the graph code just
leaves parts of the struct NULL and checks for required fields later).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When we load the oid-fanout chunk, our callback checks that its size is
reasonable and returns an error if not. However, the caller only checks
our return value against CHUNK_NOT_FOUND, so we end up ignoring the
error completely! Using a too-small fanout table means we end up
accessing random memory for the fanout and segfault.
We can fix this by checking for any non-zero return value, rather than
just CHUNK_NOT_FOUND, and adjusting our error message to cover both
cases. We could handle each error code individually, but there's not
much point for such a rare case. The extra message produced in the
callback makes it clear what is going on.
The same pattern is used in the adjacent code. Those cases are actually
OK for now because they do not use a custom callback, so the only error
they can get is CHUNK_NOT_FOUND. But let's convert them, as this is an
accident waiting to happen (especially as we convert some of them away
from pair_chunk). The error messages are more verbose, but it should be
rare for a user to see these anyway.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When testing corruption of files using the chunk format (like
commit-graphs and midx files), it's helpful to be able to modify bytes
in specific chunks. This requires being able both to read the
table-of-contents (to find the chunk to modify) but also to adjust it
(to account for size changes in the offsets of subsequent chunks).
We have some tests already which corrupt chunk files, but they have some
downsides:
1. They are very brittle, as they manually compute the expected size
of a particular instance of the file (e.g., see the definitions
starting with NUM_OBJECTS in t5319).
2. Because they rely on manual offsets and don't read the
table-of-contents, they're limited to overwriting bytes. But there
are many interesting corruptions that involve changing the sizes of
chunks (especially smaller-than-expected ones).
This patch adds a perl script which makes such corruptions easy. We'll
use it in subsequent patches.
Note that we could get by with just a big "perl -e" inside the helper
function. I chose to put it in a separate script for two reasons. One,
so we don't have to worry about the extra layer of shell quoting. And
two, the script is kind of big, and running the tests with "-x" would
repeatedly dump it into the log output.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The pair_chunk() function is provided as an easy helper for parsing
chunks that just want a pointer to a set of bytes. But every caller has
a hidden bug: because we return only the pointer without the matching
chunk size, the callers have no clue how many bytes they are allowed to
look at. And as a result, they may read off the end of the mmap'd data
when the on-disk file does not match their expectations.
Since chunk files are typically used for local-repository data like
commit-graph files and midx's, the security implications here are pretty
mild. The worst that can happen is that you hand somebody a corrupted
repository tarball, and running Git on it does an out-of-bounds read and
crashes. So it's worth being more defensive, but we don't need to drop
everything and fix every caller immediately.
I noticed the problem because the pair_chunk_fn() callback does not look
at its chunk_size argument, and wanted to annotate it to silence
-Wunused-parameter. We could do that now, but we'd lose the hint that
this code should be audited and fixed.
So instead, let's set ourselves up for going down that path:
1. Provide a pair_chunk() function that does return the size, which
prepares us for fixing these cases.
2. Rename the existing function to pair_chunk_unsafe(). That gives us
an easy way to grep for cases which still need to be fixed, and the
name should cause anybody adding new calls to think twice before
using it.
There are no callers of the "safe" version yet, but we'll add some in
subsequent patches.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The display width table for unicode characters has been updated for
Unicode 15.1
* bb/unicode-width-table-15:
unicode: update the width tables to Unicode 15.1
"git for-each-ref" and friends learn to apply mailmap to authorname
and other fields.
* ks/ref-filter-mailmap:
ref-filter: add mailmap support
t/t6300: introduce test_bad_atom
t/t6300: cleanup test_atom
"git rev-list --stdin" learned to take non-revisions (like "--not")
recently from the standard input, but the way such a "--not" was
handled was quite confusing, which has been rethought. This is
potentially a change that breaks backward compatibility.
* ps/revision-cmdline-stdin-not:
revision: make pseudo-opt flags read via stdin behave consistently
"checkout --merge -- path" and "update-index --unresolve path" did
not resurrect conflicted state that was resolved to remove path,
but now they do.
* jc/unresolve-removal:
checkout: allow "checkout -m path" to unmerge removed paths
checkout/restore: add basic tests for --merge
checkout/restore: refuse unmerging paths unless checking out of the index
update-index: remove stale fallback code for "--unresolve"
update-index: use unmerge_index_entry() to support removal
resolve-undo: allow resurrecting conflicted state that resolved to deletion
update-index: do not read HEAD and MERGE_HEAD unconditionally
UBSAN options were not propagated through the test framework to git
run via the httpd, unlike ASAN options, which has been corrected.
* jk/test-pass-ubsan-options-to-http-test:
test-lib: set UBSAN_OPTIONS to match ASan
The command line completion script (in contrib/) can be told to
complete aliases by including ": git <cmd> ;" in the alias to tell
it that the alias should be completed similar to how "git <cmd>" is
completed. The parsing code for the alias as been loosened to
allow ';' without an extra space before it.
* jc/alias-completion:
completion: loosen and document the requirement around completing alias
"git range-diff --notes=foo" compared "log --notes=foo --notes" of
the two ranges, instead of using just the specified notes tree.
* kh/range-diff-notes:
range-diff: treat notes like `log`
"git diff" learned diff.statNameWidth configuration variable, to
give the default width for the name part in the "--stat" output.
* ds/stat-name-width-configuration:
diff --stat: add config option to limit filename width
Unused parameters in fsmonitor related code paths have been marked
as such.
* jk/fsmonitor-unused-parameter:
run-command: mark unused parameters in start_bg_wait callbacks
fsmonitor: mark unused hashmap callback parameters
fsmonitor/darwin: mark unused parameters in system callback
fsmonitor: mark unused parameters in stub functions
fsmonitor/win32: mark unused parameter in fsm_os__incompatible()
fsmonitor: mark some maybe-unused parameters
fsmonitor/win32: drop unused parameters
fsmonitor: prefer repo_git_path() to git_pathdup()
Fix recent regression in Git-GUI that fails to run hook scripts at
all.
* ml/git-gui-exec-path-fix:
git-gui - use git-hook, honor core.hooksPath
git-gui - re-enable use of hook scripts
The soft limit of the first line of the commit message should be
"no more than 50 characters" or "50 characters or less", but not
"less than 50 character".
Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The load_commit_graph_chain_fd_st() function will stop loading chains
when it sees an error. But if it has loaded any graph slice at all, it
will return it. This is a good thing for normal use (we use what data we
can, and this is just an optimization). But it's a bad thing for
"commit-graph verify", which should be careful about finding any
irregularities. We do complain to stderr with a warning(), but the
verify command still exits with a successful return code.
The new tests here cover corruption of both the base and tip slices of
the chain. The corruption of the base file already works (it is the
first file we look at, so when we see the error we return NULL). The
"tip" case is what is fixed by this patch (it complains to stderr but
still returns the base slice).
Likewise the existing tests for corruption of the commit-graph-chain
file itself need to be updated. We already exited non-zero correctly for
the "base" case, but the "tip" case can now do so, too.
Note that this also causes us to adjust a test later in the file that
similarly corrupts a tip (though confusingly the test script calls this
"base"). It checks stderr but erroneously expects the whole "verify"
command to exit with a successful code.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When we open a commit-graph-chain file, if it's smaller than a single
entry, we just quietly treat that as ENOENT. That make some sense if the
file is truly zero bytes, but it means that "commit-graph verify" will
quietly ignore a file that contains garbage if that garbage happens to
be short.
Instead, let's only simulate ENOENT when the file is truly empty, and
otherwise return EINVAL. The normal graph-loading routines don't care,
but "commit-graph verify" will notice and complain about the difference.
It's not entirely clear to me that the 0-is-ENOENT case actually happens
in real life, so we could perhaps just eliminate this special-case
altogether. But this is how we've always behaved, so I'm preserving it
in the name of backwards compatibility (though again, it really only
matters for "verify", as the regular routines are happy to load what
they can).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Because it's OK to not have a graph file at all, the graph_verify()
function needs to tell the difference between a missing file and a real
error. So when loading a traditional graph file, we call
open_commit_graph() separately from load_commit_graph_chain_fd_st(), and
don't complain if the first one fails with ENOENT.
When the function learned about chain files in 3da4b609bb (commit-graph:
verify chains with --shallow mode, 2019-06-18), we couldn't be as
careful, since the only way to load a chain was with
read_commit_graph_one(), which did both the open/load as a single unit.
So we'll miss errors in chain files we load, thinking instead that there
was just no chain file at all.
Note that we do still report some of these problems to stderr, as the
loading function calls error() and warning(). But we'd exit with a
successful exit code, which is wrong.
We can fix that by using the recently split open/load functions for
chains. That lets us treat the chain file just like a single file with
respect to error handling here.
An existing test (from 3da4b609bb) shows off the problem; we were
expecting "commit-graph verify" to report success, but that makes no
sense. We did not even verify the contents of the graph data, because we
couldn't load it! I don't think this was an intentional exception, but
rather just the test covering what happened to occur.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In t5324.20, we corrupt a hex character 60 bytes into the graph chain
file. Since the file consists of two hash identifiers, one per line, the
corruption differs between sha1 and sha256. In a sha1 repository, the
corruption is on the second line, and in a sha256 repository, it is on
the first.
We should of course detect the problem with either line. But as the next
few patches will show (and fix), that is not the case (in fact, we
currently do not exit non-zero for either line!). And while at the end
of our series we'll catch all errors, our intermediate states will have
differing behavior between the two hashes.
Let's make sure we test corruption of both the first and second lines,
and do so consistently with either hash by choosing offsets which are
always in the first hash (30 bytes) or in the second (70).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In read_commit_graph_one(), we call validate_mixed_generation_chain()
after loading the graph. Even though we don't check the return value,
this has the side effect of clearing the read_generation_data flag,
which is important when working with mixed generation numbers.
But doing this in load_commit_graph_chain_fd_st() makes more sense:
1. We are calling it even when we did not load a chain at all, which
is pointless (you cannot have mixed generations in a single file).
2. For now, all callers load the graph via read_commit_graph_one().
But the point of factoring out the open/load in the previous commit
was to let "commit-graph verify" call them separately. So it needs
to trigger this function as part of the load.
Without this patch, the mixed-generation tests in t5324 would start
failing on "git commit-graph verify" calls, once we switch to using
a separate open/load call there.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The load_commit_graph_chain() function opens the chain file and all of
the slices of graph that it points to. If there is no chain file (which
is a totally normal condition), we return NULL. But if we run into
errors with the chain file or loading the actual graph data, we also
return NULL, and the caller cannot tell the difference.
The caller can check for ENOENT for the unremarkable "no such file"
case. But I'm hesitant to assume that the rest of the function would
never accidentally set errno to ENOENT itself, since it is opening the
slice files (and that would mean the caller fails to notice a real
error).
So let's break this into two functions: one to open the file, and one to
actually load it. This matches the interface we provide for the
non-chain graph file, which will also come in handy in a moment when we
fix some bugs in the "git commit-graph verify" code.
Some notes:
- I've kept the "1 is good, 0 is bad" return convention (and the weird
"fd" out-parameter) used by the matching open_commit_graph()
function and other parts of the commit-graph code. This is unlike
most of the rest of Git (which would just return the fd, with -1 for
error), but it makes sense to stay consistent with the adjacent bits
of the API here.
- The existing chain loading function will quietly return if the file
is too small to hold a single entry. I've retained that behavior
(and explicitly set ENOENT in the opener function) for now, under
the notion that it's probably valid (though I'd imagine unusual) to
have an empty chain file.
There are two small behavior changes here, but I think both are strictly
positive:
1. The original blindly did a stat() before checking if fopen()
succeeded, meaning we were making a pointless extra stat call.
2. We now use fstat() to check the file size. The previous code using
a regular stat() on the pathname meant we could technically race
with somebody updating the chain file, and end up with a size that
does not match what we just opened with fopen(). I doubt anybody
ever hit this in practice, but it may have caused an out-of-bounds
read.
We'll retain the load_commit_graph_chain() function which does both the
open and reading steps (most existing callers do not care about seeing
errors anyway, since loading commit-graphs is optimistic).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Add mailmap support to ref-filter formats which are similar in
pretty. This support is such that the following pretty placeholders are
equivalent to the new ref-filter atoms:
%aN = authorname:mailmap
%cN = committername:mailmap
%aE = authoremail:mailmap
%aL = authoremail:mailmap,localpart
%cE = committeremail:mailmap
%cL = committeremail:mailmap,localpart
Additionally, mailmap can also be used with ":trim" option for email by
doing something like "authoremail:mailmap,trim".
The above also applies for the "tagger" atom, that is,
"taggername:mailmap", "taggeremail:mailmap", "taggeremail:mailmap,trim"
and "taggername:mailmap,localpart".
The functionality of ":trim" and ":localpart" remains the same. That is,
":trim" gives the email, but without the angle brackets and ":localpart"
gives the part of the email before the '@' character (if such a
character is not found then we directly grab everything between the
angle brackets).
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Kousik Sanagavarapu <five231003@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Introduce a new function "test_bad_atom", which is similar to
"test_atom()" but should be used to check whether the correct error
message is shown on stderr.
Like "test_atom", the new function takes three arguments. The three
arguments specify the ref, the format and the expected error message
respectively, with an optional fourth argument for tweaking
"test_expect_*" (which is by default "success").
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Kousik Sanagavarapu <five231003@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Previously, when the executable part of "test_expect_{success,failure}"
(inside "test_atom") got "eval"ed, it would have been syntactically
incorrect if the second argument ($2, which is the format) to "test_atom"
were enclosed in single quotes because the $variables would get
interpolated even before the arguments to "test_expect_{success,failure}"
are formed.
So fix this and also some style issues along the way.
Helped-by: Junio C Hamano <gitster@pobox.com>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: Kousik Sanagavarapu <five231003@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When reading revisions from stdin via git-rev-list(1)'s `--stdin` option
then these revisions never honor flags like `--not` which have been
passed on the command line. Thus, an invocation like e.g. `git rev-list
--all --not --stdin` will not treat all revisions read from stdin as
uninteresting. While this behaviour may be surprising to a user, it's
been this way ever since it has been introduced via 42cabc341c (Teach
rev-list an option to read revs from the standard input., 2006-09-05).
With that said, in c40f0b7877 (revision: handle pseudo-opts in `--stdin`
mode, 2023-06-15) we have introduced a new mode to read pseudo opts from
standard input where this behaviour is a lot more confusing. If you pass
`--not` via stdin, it will:
- Influence subsequent revisions or pseudo-options passed on the
command line.
- Influence pseudo-options passed via standard input.
- _Not_ influence normal revisions passed via standard input.
This behaviour is extremely inconsistent and bound to cause confusion.
While it would be nice to retroactively change the behaviour for how
`--not` and `--stdin` behave together, chances are quite high that this
would break existing scripts that expect the current behaviour that has
been around for many years by now. This is thus not really a viable
option to explore to fix the inconsistency.
Instead, we change the behaviour of how pseudo-opts read via standard
input influence the flags such that the effect is fully localized. With
this change, when reading `--not` via standard input, it will:
- _Not_ influence subsequent revisions or pseudo-options passed on
the command line, which is a change in behaviour.
- Influence pseudo-options passed via standard input.
- Influence normal revisions passed via standard input, which is a
change in behaviour.
Thus, all flags read via standard input are fully self-contained to that
standard input, only.
While this is a breaking change as well, the behaviour has only been
recently introduced with Git v2.42.0. Furthermore, the current behaviour
can be regarded as a simple bug. With that in mind it feels like the
right thing to retroactively change it and make the behaviour sane.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Reported-by: Christian Couder <christian.couder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
An error message given by "git send-email" when given a malformed
address did not give correct information, which has been corrected.
* tb/send-email-extract-valid-address-error-message-fix:
git-send-email.perl: avoid printing undef when validating addresses
HTTP Header redaction code has been adjusted for a newer version of
cURL library that shows its traces differently from earlier
versions.
* jk/redact-h2h3-headers-fix:
http: update curl http/2 info matching for curl 8.3.0
http: factor out matching of curl http/2 trace lines
Code clean-up.
* jk/ort-unused-parameter-cleanups:
merge-ort: lowercase a few error messages
merge-ort: drop unused "opt" parameter from merge_check_renames_reusable()
merge-ort: drop unused parameters from detect_and_process_renames()
merge-ort: stop passing "opt" to read_oid_strbuf()
merge-ort: drop custom err() function
The code to keep track of existing packs in the repository while
repacking has been refactored.
* tb/repack-existing-packs-cleanup:
builtin/repack.c: extract common cruft pack loop
builtin/repack.c: avoid directly inspecting "util"
builtin/repack.c: store existing cruft packs separately
builtin/repack.c: extract `has_existing_non_kept_packs()`
builtin/repack.c: extract redundant pack cleanup for existing packs
builtin/repack.c: extract redundant pack cleanup for --geometric
builtin/repack.c: extract marking packs for deletion
builtin/repack.c: extract structure to store existing packs
Code clean-up.
Keep only the first three clean-ups, and discard the rest to be replaced later.
cf. <owly1qetjqo1.fsf@fine.c.googlers.com>
cf. <owlyzg1dsswr.fsf@fine.c.googlers.com>
* la/trailer-cleanups:
trailer: split process_command_line_args into separate functions
trailer: split process_input_file into separate pieces
trailer: separate public from internal portion of trailer_iterator
For a long time we have used ASAN_OPTIONS to set abort_on_error. This is
important because we want to notice detected problems even in programs
which are expected to fail. But we never did the same for UBSAN_OPTIONS.
This means that our UBSan test suite runs might silently miss some
cases.
It also causes a more visible effect, which is that t4058 complains
about unexpected "fixes" (and this is how I noticed the issue):
$ make SANITIZE=undefined CC=gcc && (cd t && ./t4058-*)
...
ok 8 - git read-tree does not segfault # TODO known breakage vanished
ok 9 - reset --hard does not segfault # TODO known breakage vanished
ok 10 - git diff HEAD does not segfault # TODO known breakage vanished
The tests themselves aren't that interesting. We have a known bug where
these programs segfault, and they do when compiled without sanitizers.
With UBSan, when the test runs:
test_might_fail git read-tree --reset base
it gets:
cache-tree.c:935:9: runtime error: member access within misaligned address 0x5a5a5a5a5a5a5a5a for type 'struct cache_entry', which requires 8 byte alignment
So that's garbage memory which would _usually_ cause us to segfault, but
UBSan catches it and complains first about the alignment. That makes
sense, but the weird thing is that UBSan then exits instead of aborting,
so our test_might_fail call considers that an acceptable outcome and the
test "passes".
Curiously, this historically seems to have aborted, because I've run
"make test" with UBSan many times (and so did our CI) and we never saw
the problem. Even more curiously, I see an abort if I use clang with
ASan and UBSan together, like:
# this aborts!
make SANITIZE=undefined,address CC=clang
But not with just UBSan, and not with both when used with gcc:
# none of these do
make SANITIZE=undefined CC=gcc
make SANITIZE=undefined CC=clang
make SANITIZE=undefined,address CC=gcc
Likewise moving to older versions of gcc (I tried gcc-11 and gcc-12 on
my Debian system) doesn't abort. Nor does moving around in Git's
history. Neither this test nor the relevant code have been touched in a
while, and going back to v2.41.0 produces the same outcome (even though
many UBSan CI runs have passed in the meantime).
So _something_ changed on my system (and likely will soon on other
people's, since this is stock Debian unstable), but I didn't track
it further. I don't know why it ever aborted in the past, but we
definitely should be explicit here and tell UBSan what we want to
happen.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The argument order was incorrect. This was introduced by 246cac8505
(i18n: turn even more messages into "cannot be used together" ones,
2022-01-05).
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Recently we started to tell users to spell ": git foo ;" with
space(s) around 'foo' for an alias to be completed similarly
to the 'git foo' command. It however is easy to also allow users to
spell it in a more natural way with the semicolon attached to 'foo',
i.e. ": git foo;". Also, add a comment to note that 'git' is optional
and writing ": foo;" would complete the alias just fine.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Jeff King
Junio C Hamano
谢致邦 (XIE Zhibang)
Beat Bolli
Kousik Sanagavarapu
Patrick Steinhardt
Josh Soref
Oswald Buddenhagen