As with export-marks in the previous commit, import-marks can access the
filesystem. This is significantly less dangerous than export-marks
because it only involves reading from arbitrary paths, rather than
writing them. However, it could still be surprising and have security
implications (e.g., exfiltrating data from a service that accepts
fast-import streams).
Let's lump it (and its "if-exists" counterpart) in with export-marks,
and enable the in-stream version only if --allow-unsafe-features is set.
Signed-off-by: Jeff King <peff@peff.net>
The fast-import stream command "feature export-marks=<path>" lets the
stream write marks to an arbitrary path. This may be surprising if you
are running fast-import against an untrusted input (which otherwise
cannot do anything except update Git objects and refs).
Let's disallow the use of this feature by default, and provide a
command-line option to re-enable it (you can always just use the
command-line --export-marks as well, but the in-stream version provides
an easy way for exporters to control the process).
This is a backwards-incompatible change, since the default is flipping
to the new, safer behavior. However, since the main users of the
in-stream versions would be import/export-based remote helpers, and
since we trust remote helpers already (which are already running
arbitrary code), we'll pass the new option by default when reading a
remote helper's stream. This should minimize the impact.
Note that the implementation isn't totally simple, as we have to work
around the fact that fast-import doesn't parse its command-line options
until after it has read any "feature" lines from the stream. This is how
it lets command-line options override in-stream. But in our case, it's
important to parse the new --allow-unsafe-features first.
There are three options for resolving this:
1. Do a separate "early" pass over the options. This is easy for us to
do because there are no command-line options that allow the
"unstuck" form (so there's no chance of us mistaking an argument
for an option), though it does introduce a risk of incorrect
parsing later (e.g,. if we convert to parse-options).
2. Move the option parsing phase back to the start of the program, but
teach the stream-reading code never to override an existing value.
This is tricky, because stream "feature" lines override each other
(meaning we'd have to start tracking the source for every option).
3. Accept that we might parse a "feature export-marks" line that is
forbidden, as long we don't _act_ on it until after we've parsed
the command line options.
This would, in fact, work with the current code, but only because
the previous patch fixed the export-marks parser to avoid touching
the filesystem.
So while it works, it does carry risk of somebody getting it wrong
in the future in a rather subtle and unsafe way.
I've gone with option (1) here as simple, safe, and unlikely to cause
regressions.
This fixes CVE-2019-1348.
Signed-off-by: Jeff King <peff@peff.net>
When we parse the --export-marks option, we don't immediately open the
file, but we do create any leading directories. This can be especially
confusing when a command-line option overrides an in-stream one, in
which case we'd create the leading directory for the in-stream file,
even though we never actually write the file.
Let's instead create the directories just before opening the file, which
means we'll create only useful directories. Note that this could change
the handling of relative paths if we chdir() in between, but we don't
actually do so; the only permanent chdir is from setup_git_directory()
which runs before either code path (potentially we should take the
pre-setup dir into account to avoid surprising the user, but that's an
orthogonal change).
The test just adapts the existing "override" test to use paths with
leading directories. This checks both that the correct directory is
created (which worked before but was not tested), and that the
overridden one is not (our new fix here).
While we're here, let's also check the error result of
safe_create_leading_directories(). We'd presumably notice any failure
immediately after when we try to open the file itself, but we can give a
more specific error message in this case.
Signed-off-by: Jeff King <peff@peff.net>
When asked to import marks from "subdir/file.marks", we create the
leading directory "subdir" if it doesn't exist. This makes no sense for
importing marks, where we only ever open the path for reading.
Most of the time this would be a noop, since if the marks file exists,
then the leading directories exist, too. But if it doesn't (e.g.,
because --import-marks-if-exists was used), then we'd create the useless
directory.
This dates back to 580d5f83e7 (fast-import: always create marks_file
directories, 2010-03-29). Even then it was useless, so it seems to have
been added in error alongside the --export-marks case (which _is_
helpful).
Signed-off-by: Jeff King <peff@peff.net>
We parse options like "--max-pack-size=" using skip_prefix(), which
makes sense to get at the bytes after the "=". However, we also parse
"--quiet" and "--stats" with skip_prefix(), which allows things like
"--quiet-nonsense" to behave like "--quiet".
This was a mistaken conversion in 0f6927c229 (fast-import: put option
parsing code in separate functions, 2009-12-04). Let's tighten this to
an exact match, which was the original intent.
Signed-off-by: Jeff King <peff@peff.net>
Our tests confirm that providing two "import-marks" options in a
fast-import stream is an error. However, the invoked command would fail
even without covering this case, because the marks files themselves do
not actually exist. Let's create the files to make sure we fail for the
right reason (we actually do, because the option parsing happens before
we open anything, but this future-proofs our test).
Signed-off-by: Jeff King <peff@peff.net>
This typo was introduced in 2153d478b7 (pkt-line: introduce
packet_read_with_status, 2018-03-14).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Some codepaths in "gitweb" that forgot to escape URLs generated
based on end-user input have been corrected.
* jk/gitweb-anti-xss:
gitweb: escape URLs generated by href()
t/gitweb-lib.sh: set $REQUEST_URI
t/gitweb-lib.sh: drop confusing quotes
t9502: pass along all arguments in xss helper
The completion script (in contrib/) has been taught that "git svn"
supports the "--recursive" option.
* js/complete-svn-recursive:
completion: tab-complete "git svn --recursive"
Error handling after "git push" finishes sending the packdata and
waits for the response to the remote side has been improved.
* jk/send-pack-remote-failure:
send-pack: check remote ref status on pack-objects failure
"git fetch" codepath had a big "do not lazily fetch missing objects
when I ask if something exists" switch. This has been corrected by
marking the "does this thing exist?" calls with "if not please do not
lazily fetch it" flag.
* jt/fetch-remove-lazy-fetch-plugging:
promisor-remote: remove fetch_if_missing=0
clone: remove fetch_if_missing=0
fetch: remove fetch_if_missing=0
The completion script (in contrib/) learned that the "--onto"
option of "git rebase" can take its argument as the value of the
option.
* dl/complete-rebase-onto:
completion: learn to complete `git rebase --onto=`
Recent update to "git stash pop" made the command empty the index
when run with the "--quiet" option, which has been corrected.
* tg/stash-refresh-index:
stash: make sure we have a valid index before writing it
Handling of commit objects that use non UTF-8 encoding during
"rebase -i" has been improved.
* dd/sequencer-utf8:
sequencer: reencode commit message for am/rebase --show-current-patch
sequencer: reencode old merge-commit message
sequencer: reencode squashing commit's message
sequencer: reencode revert/cherry-pick's todo list
sequencer: reencode to utf-8 before arrange rebase's todo list
t3900: demonstrate git-rebase problem with multi encoding
configure.ac: define ICONV_OMITS_BOM if necessary
t0028: eliminate non-standard usage of printf
"git bundle" has been taught to use the parse options API. "git
bundle verify" learned "--quiet" and "git bundle create" learned
options to control the progress output.
* rj/bundle-ui-updates:
bundle-verify: add --quiet
bundle-create: progress output control
bundle: framework for options before bundle file
The patterns to detect function boundary for Elixir language has
been added.
* ln/userdiff-elixir:
userdiff: add Elixir to supported userdiff languages
Docfix.
* en/doc-typofix:
Fix spelling errors in no-longer-updated-from-upstream modules
multimail: fix a few simple spelling errors
sha1dc: fix trivial comment spelling error
Fix spelling errors in test commands
Fix spelling errors in messages shown to users
Fix spelling errors in names of tests
Fix spelling errors in comments of testcases
Fix spelling errors in code comments
Fix spelling errors in documentation outside of Documentation/
Documentation: fix a bunch of typos, both old and new
Misc doc fixes.
* en/misc-doc-fixes:
name-hash.c: remove duplicate word in comment
hashmap: fix documentation misuses of -> versus .
git-filter-branch.txt: correct argument name typo
Fetching from multiple remotes into the same repository in parallel
had a bad interaction with the recent change to (optionally) update
the commit-graph after a fetch job finishes, as these parallel
fetches compete with each other. Which has been corrected.
* js/fetch-multi-lockfix:
fetch: avoid locking issues between fetch.jobs/fetch.writeCommitGraph
fetch: add the command-line option `--write-commit-graph`
The watchman integration for fsmonitor was racy, which has been
corrected to be more conservative.
* kw/fsmonitor-watchman-fix:
fsmonitor: fix watchman integration
HTTP transport had possible allocator/deallocator mismatch, which
has been corrected.
* cb/curl-use-xmalloc:
remote-curl: unbreak http.extraHeader with custom allocators
Follow recent push to move API docs from Documentation/ to header
files and update config.h
* hw/config-doc-in-header:
config: move documentation to config.h
Messages from die() etc. can be mixed up from multiple processes
without even line buffering on Windows, which has been worked
around.
* js/vreportf-wo-buffering:
vreportf(): avoid relying on stdio buffering
"git worktree add" internally calls "reset --hard" that should not
descend into submodules, even when submodule.recurse configuration
is set, but it was affected. This has been corrected.
* pb/no-recursive-reset-hard-in-worktree-add:
worktree: teach "add" to ignore submodule.recurse config
"git merge --no-commit" needs "--no-ff" if you do not want to move
HEAD, which has been corrected in the manual page for "git bisect".
* ma/bisect-doc-sample-update:
Documentation/git-bisect.txt: add --no-ff to merge command
"git rev-parse --git-path HEAD.lock" did not give the right path
when run in a secondary worktree.
* js/git-path-head-dot-lock-fix:
git_path(): handle `.lock` files correctly
t1400: wrap setup code in test case
