|
e1832eb2
|
2019-09-18T16:33:18
|
|
path: also guard `.gitmodules` against NTFS Alternate Data Streams
We just safe-guarded `.git` against NTFS Alternate Data Stream-related
attack vectors, and now it is time to do the same for `.gitmodules`.
Note: In the added regression test, we refrain from verifying all kinds
of variations between short names and NTFS Alternate Data Streams: as
the new code disallows _all_ Alternate Data Streams of `.gitmodules`, it
is enough to test one in order to know that all of them are guarded
against.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
|
|
|
3f7851ea
|
2019-09-18T14:32:05
|
|
Disallow NTFS Alternate Data Stream attacks, even on Linux/macOS
A little-known feature of NTFS is that it offers to store metadata in
so-called "Alternate Data Streams" (inspired by Apple's "resource
forks") that are copied together with the file they are associated with.
These Alternate Data Streams can be accessed via `<file name>:<stream
name>:<stream type>`.
Directories, too, have Alternate Data Streams, and they even have a
default stream type `$INDEX_ALLOCATION`. Which means that `abc/` and
`abc::$INDEX_ALLOCATION/` are actually equivalent.
This is of course another attack vector on the Git directory that we
definitely want to prevent.
On Windows, we already do this incidentally, by disallowing colons in
file/directory names.
While it looks as if files'/directories' Alternate Data Streams are not
accessible in the Windows Subsystem for Linux, and neither via
CIFS/SMB-mounted network shares in Linux, it _is_ possible to access
them on SMB-mounted network shares on macOS.
Therefore, let's go the extra mile and prevent this particular attack
_everywhere_. To keep things simple, let's just disallow *any* Alternate
Data Stream of `.git`.
This is libgit2's variant of CVE-2019-1352.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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|
b8464342
|
2019-12-03T17:47:31
|
|
path: rename function that detects end of filename
The function `only_spaces_and_dots` used to detect the end of the
filename on win32. Now we look at spaces and dots _before_ the end of
the string _or_ a `:` character, which would signify a win32 alternate
data stream.
Thus, rename the function `ntfs_end_of_filename` to indicate that it
detects the (virtual) end of a filename, that any further characters
would be elided to the given path.
|
|
|
64c612cc
|
2019-09-18T15:25:02
|
|
Protect against 8.3 "short name" attacks also on Linux/macOS
The Windows Subsystem for Linux (WSL) is getting increasingly popular,
in particular because it makes it _so_ easy to run Linux software on
Windows' files, via the auto-mounted Windows drives (`C:\` is mapped to
`/mnt/c/`, no need to set that up manually).
Unfortunately, files/directories on the Windows drives can be accessed
via their _short names_, if that feature is enabled (which it is on the
`C:` drive by default).
Which means that we have to safeguard even our Linux users against the
short name attacks.
Further, while the default options of CIFS/SMB-mounts seem to disallow
accessing files on network shares via their short names on Linux/macOS,
it _is_ possible to do so with the right options.
So let's just safe-guard against short name attacks _everywhere_.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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|
bdf96512
|
2019-12-03T21:17:30
|
|
MSVC: Fix warning C4133 on x64: "function": Incompatible types - from "unsigned long *" to "size_t *"
Signed-off-by: Sven Strickroth <email@cs-ware.de>
|
|
|
36bfc27a
|
2019-12-01T14:38:54
|
|
Merge pull request #5314 from pks-t/pks/dll-main-removal
global: convert to fiber-local storage to fix exit races
|
|
5c6180b5
|
2019-11-29T11:06:11
|
|
global: convert to fiber-local storage to fix exit races
On Windows platforms, we automatically clean up the thread-local storage
upon detaching a thread via `DllMain()`. The thing is that this happens
for every thread of applications that link against the libgit2 DLL, even
those that don't have anything to do with libgit2 itself. As a result,
we cannot assume that these unsuspecting threads make use of our
`git_libgit2_init()` and `git_libgit2_shutdow()` reference counting,
which may lead to racy situations:
Thread 1 Thread 2
git_libgit2_shutdown()
DllMain(DETACH_THREAD)
git__free_tls_data()
git_atomic_dec() == 0
git__free_tls_data()
TlsFree(_tls_index)
TlsGetValue(_tls_index)
Due to the second thread never having executed `git_libgit2_init()`, the
first thread will clean up TLS data and as a result also free the
`_tls_index` variable. When detaching the second thread, we
unconditionally access the now-free'd `_tls_index` variable, which is
obviously not going to work out well.
Fix the issue by converting the code to use fiber-local storage instead
of thread-local storage. While FLS will behave the exact same as TLS if
no fibers are in use, it does allow us to specify a destructor similar
to the one that is accepted by pthread_key_create(3P). Like this, we do
not have to manually free indices anymore, but will let the FLS handle
calling the destructor. This allows us to get rid of `DllMain()`
completely, as we only used it to keep track of when threads were
exiting and results in an overall simplification of TLS cleanup.
|
|
|
33e6c402
|
2019-11-28T15:26:36
|
|
patch_parse: fix out-of-bounds reads caused by integer underflow
The patch format for binary files is a simple Base85 encoding with a
length byte as prefix that encodes the current line's length. For each
line, we thus check whether the line's actual length matches its
expected length in order to not faultily apply a truncated patch. This
also acts as a check to verify that we're not reading outside of the
line's string:
if (encoded_len > ctx->parse_ctx.line_len - 1) {
error = git_parse_err(...);
goto done;
}
There is the possibility for an integer underflow, though. Given a line
with a single prefix byte, only, `line_len` will be zero when reaching
this check. As a result, subtracting one from that will result in an
integer underflow, causing us to assume that there's a wealth of bytes
available later on. Naturally, this may result in an out-of-bounds read.
Fix the issue by checking both `encoded_len` and `line_len` for a
non-zero value. The binary format doesn't make use of zero-length lines
anyway, so we need to know that there are both encoded bytes and
remaining characters available at all.
This patch also adds a test that works based on the last error message.
Checking error messages is usually too tightly coupled, but in fact
parsing the patch failed even before the change. Thus the only
possibility is to use e.g. Valgrind, but that'd result in us not
catching issues when run without Valgrind. As a result, using the error
message is considered a viable tradeoff as we know that we didn't start
decoding Base85 in the first place.
|
|
|
fb439c97
|
2019-11-28T14:41:58
|
|
Merge pull request #5306 from herrerog/patchid
diff: complete support for git patchid
|
|
|
61176a9b
|
2019-11-28T14:31:16
|
|
Merge pull request #5243 from pks-t/pks/config-optimize-mem
Memory optimizations for config entries
|
|
ece5bb5e
|
2019-11-07T14:10:00
|
|
diff: make patchid computation work with all types of commits.
Current implementation of patchid is not computing a correct patchid
when given a patch where, for example, a new file is added or removed.
Some more corner cases need to be handled to have same behavior as git
patch-id command.
Add some more tests to cover those corner cases.
Signed-off-by: Gregory Herrero <gregory.herrero@oracle.com>
|
|
|
0b5540b9
|
2019-11-28T13:56:54
|
|
Merge pull request #5307 from palmin/hash_sha256
ssh: include sha256 host key hash when supported
|
|
|
dfea0713
|
2019-11-28T13:51:40
|
|
Merge pull request #5272 from tiennou/examples/cli-ification
Various examples shape-ups
|
|
|
0e5243b7
|
2019-11-28T12:42:36
|
|
Merge pull request #5123 from libgit2/ethomson/off_t
Move `git_off_t` to `git_object_size_t`
|
|
|
6460e8ab
|
2019-06-23T18:13:29
|
|
internal: use off64_t instead of git_off_t
Prefer `off64_t` internally.
|
|
|
05237ee5
|
2019-06-23T17:20:17
|
|
integer: use int64_t's for checks
Use int64_t internally for type visibility.
|
|
|
ee0c8618
|
2019-06-23T17:19:31
|
|
offmap: store off64_t's instead of git_off_t's
Prefer `off64_t` to `git_off_t` internally for visibility.
|
|
|
8be12026
|
2019-06-23T17:09:22
|
|
mmap: use a 64-bit signed type `off64_t` for mmap
Prefer `off64_t` to `git_off_t` for internal visibility.
|
|
|
7e1cc296
|
2019-11-25T13:17:42
|
|
mmap: remove unnecessary assertion
64 bit types are always 64 bit.
|
|
|
cb77423f
|
2019-11-24T16:22:31
|
|
valgrind: add valgrind hints in OpenSSL
Provide usage hints to valgrind. We trust the data coming back from
OpenSSL to have been properly initialized. (And if it has not, it's an
OpenSSL bug, not a libgit2 bug.)
We previously took the `VALGRIND` option to CMake as a hint to disable
mmap. Remove that; it's broken. Now use it to pass on the `VALGRIND`
definition so that sources can provide valgrind hints.
|
|
|
2ad3eb3e
|
2019-11-24T15:59:26
|
|
valgrind: add suppressions for undefined use
valgrind will warn that OpenSSL will use undefined data in connect/read
when talking to certain other TLS stacks. Thankfully, this only seems
to occur when gcc is the compiler, so hopefully valgrind is just
misunderstanding an optimization. Regardless, suppress this warning.
|
|
|
4dffa295
|
2019-06-23T18:09:00
|
|
blame: use a size_t for the buffer
|
|
|
6c13cf6d
|
2019-11-22T15:18:54
|
|
filestamp: use `uint64_t` for object size
Instead of using a signed type (`off_t`) use an unsigned `uint64_t` for
the size of the files.
|
|
|
fefefd1d
|
2019-06-23T16:42:14
|
|
odb: use `git_object_size_t` for object size
Instead of using a signed type (`off_t`) use a new `git_object_size_t`
for the sizes of objects.
|
|
|
fb2198db
|
2019-06-23T16:23:59
|
|
futils_filesize: use `uint64_t` for object size
Instead of using a signed type (`off_t`) use `uint64_t` for the maximum
size of files.
|
|
|
4334b177
|
2019-06-23T15:43:38
|
|
blob: use `git_object_size_t` for object size
Instead of using a signed type (`off_t`) use a new `git_object_size_t`
for the sizes of objects.
|
|
|
bed9fc6b
|
2019-06-23T15:16:47
|
|
odb: use `git_object_size_t` for object size
Instead of using a signed type (`off_t`) use a new `git_object_size_t`
for the sizes of objects.
|
|
48c3f7e1
|
2019-11-20T11:21:14
|
|
ssh: include sha256 host key hash when supported
|
|
|
048e94ad
|
2019-11-07T14:13:14
|
|
patch_parse: correct parsing of patch containing not shown binary data.
When not shown binary data is added or removed in a patch, patch parser
is currently returning 'error -1 - corrupt git binary header at line 4'.
Fix it by correctly handling case where binary data is added/removed.
Signed-off-by: Gregory Herrero <gregory.herrero@oracle.com>
|
|
|
b921964b
|
2019-11-07T13:08:51
|
|
diff_print: add support for GIT_DIFF_FORMAT_PATCH_ID.
Git is generating patch-id using a stripped down version of a patch
where hunk header and index information are not present.
Signed-off-by: Gregory Herrero <gregory.herrero@oracle.com>
|
|
|
accd7848
|
2019-11-07T13:02:38
|
|
diff_print: add a new 'print_index' flag when printing diff.
Add a new 'print_index' flag to let the caller decide whether or not
'index <oid>..<oid>' should be printed.
Since patch id needs not to have index when hashing a patch, it will be
useful soon.
Signed-off-by: Gregory Herrero <gregory.herrero@oracle.com>
|
|
|
47dd665a
|
2019-11-16T15:21:56
|
|
Merge pull request #5303 from pks-t/pks/patch-path-in-body-only
patch_parse: use paths from "---"/"+++" lines for binary patches
|
|
|
cb6bc6f2
|
2019-11-16T15:17:54
|
|
Merge pull request #5285 from pcpthm/winhttp-308
Follow 308 redirect in WinHTTP transport
|
|
|
541b8fc5
|
2019-11-16T15:12:52
|
|
Merge pull request #5302 from tiennou/fix/p_lstat-errno
fileops: correct error return on p_lstat failures when mkdir
|
|
|
de7659cc
|
2019-11-10T18:44:56
|
|
patch_parse: use paths from "---"/"+++" lines for binary patches
For some patches, it is not possible to derive the old and new file
paths from the patch header's first line, most importantly when they
contain spaces. In such a case, we derive both paths from the "---" and
"+++" lines, which allow for non-ambiguous parsing. We fail to use these
paths when parsing binary patches without data, though, as we always
expect the header paths to be filled in.
Fix this by using the "---"/"+++" paths by default and only fall back to
header paths if they aren't set. If neither of those paths are set, we
just return an error. Add two tests to verify this behaviour, one of
which would have previously caused a segfault.
|
|
0c2b0206
|
2019-11-09T09:41:13
|
|
fileops: correct error return on p_lstat failures when mkdir
IIRC I got a strange return once from lstat, which translated in a weird
error class/message being reported. As a safety measure, enforce a -1 return in
that case.
|
|
|
01ea911b
|
2019-11-06T06:04:55
|
|
Merge pull request #5299 from pks-t/pks/config-mem-snapshots
config_mem: implement support for snapshots
|
|
|
cd5e33fb
|
2019-11-06T11:08:23
|
|
global: DRY includes of assert.h
|
|
|
146e5bf7
|
2019-11-06T07:27:35
|
|
config_mem: implement support for snapshots
Similar as in commit dadbb33b6 (Fix crash if snapshotting a
config_snapshot, 2019-11-01), let's implement snapshots for in-memory
configuration entries. As this deletes more code than it adds, it
doesn't make any sense to not allow for this and allows users to treat
config backends mostly the same.
|
|
|
de543e29
|
2019-11-05T22:44:27
|
|
patch_parse: fix segfault when header path contains whitespace only
When parsing header paths from a patch, we reject any patches with empty
paths as malformed patches. We perform the check whether a path is empty
before sanitizing it, though, which may lead to a path becoming empty
after the check, e.g. if we have trimmed whitespace. This may lead to a
segfault later when any part of our patching logic actually references
such a path, which may then be a `NULL` pointer.
Fix the issue by performing the check after sanitizing. Add tests to
catch the issue as they would have produced a segfault previosuly.
|
|
|
b7dcea04
|
2019-09-26T15:06:12
|
|
config_entries: micro-optimize storage of multivars
Multivars are configuration entries that have many values for the same
name; we can thus micro-optimize this case by just retaining the name of
the first configuration entry and freeing all the others, letting them
point to the string of the first entry.
The attached test case is an extreme example that demonstrates this. It
contains a section name that is approximately 500kB in size with 20.000
entries "a=b". Without the optimization, this would require at least
20000*500kB bytes, which is around 10GB. With this patch, it only
requires 500kB+20000*1B=20500kB.
The obvious culprit here is the section header, which we repeatedly
include in each of the configuration entry's names. This makes it very
easier for an adversary to provide a small configuration file that
disproportionally blows up in memory during processing and is thus a
feasible way for a denial-of-service attack. Unfortunately, we cannot
fix the root cause by e.g. having a separate "section" field that may
easily be deduplicated due to the `git_config_entry` structure being
part of our public API. So this micro-optimization is the best we can do
for now.
|
|
|
62320860
|
2019-09-26T14:43:19
|
|
config_entries: only keep track of a single entry list
Whenever adding a configuration entry to the config entries structure,
we allocate two list heads:
- The first list head is added to the global list of config entries
in order to be able to iterate over configuration entries in the
order they were originally added.
- The second list head is added to the map of entries in order to
efficiently look up an entry by its name. If no entry with the
same name exists in the map, then we add the new entry to the map
directly. Otherwise, we append the new entry's list head to the
pre-existing entry's list in order to keep track of multivars.
While the former usecase is perfectly sound, the second usecase can be
optimized. The only reason why we keep track of multivar entries in
another separate list is to be able to determine whether an entry is
unique or not by seeing whether its `next` pointer is set. So we keep
track of a complete list of multivar entries just to have a single bit
of information of whether it has other multivar entries with the same
entry name.
We can completely get rid of this secondary list by just adding a
`first` field to the list structure itself. When executing
`git_config_entries_append`, we will then simply check whether the
configuration map already has an entry with the same name -- if so, we
will set the `first` to zero to indicate that it is not the initial
entry anymore. Instead of a second list head in the map, we can thus now
directly store the list head of the first global list inside of the map
and just refer to that bit.
Note that the more obvious solution would be to store a `unique` field
instead of a `first` field. But as we will only ever inspect the `first`
field of the _last_ entry that has been moved into the map, these are
semantically equivalent in that case.
Having a `first` field also allows for a minor optimization: for
multivar values, we can free the `name` field of all entries that are
_not_ first and have them point to the name of the first entry instead.
|
|
|
8a88701e
|
2019-09-26T13:37:18
|
|
config_entries: mark local functions as static
Some functions which are only used in "config_entries.c" are not marked
as static, which is being fixed by this very commit.
|
|
|
56b203a5
|
2019-10-24T12:20:27
|
|
config_file: keep reference to config entries when creating iterator
When creating a configuration file iterator, then we first refresh the
backend and then afterwards duplicate all refreshed configuration
entries into the iterator in order to avoid seeing any concurrent
modifications of the entries while iterating. The duplication of entries
is not guarded, though, as we do not increase the refcount of the
entries that we duplicate right now. This opens us up for a race, as
another thread may concurrently refresh the repository configuration and
thus swap out the current set of entries. As we didn't increase the
refcount, this may lead to the entries being free'd while we iterate
over them in the first thread.
Fix the issue by properly handling the lifecycle of the backend's
entries via `config_file_entries_take` and `git_config_entries_free`,
respectively.
|
|
|
0927156a
|
2019-10-24T12:32:11
|
|
config_file: refactor taking entries ref to return an error code
The function to take a reference to the config file's config entries
currently returns the reference via return value. Due to this, it's
harder than necessary to integrate into our typical coding style, as one
needs to make sure that a proper error code is set before erroring out
from the caller. This bites us in `config_file_delete`, where we call
`goto out` directly when `config_file_entries_take` returns `NULL`, but
we actually forget to set up the error code and thus return success.
Fix the issue by refactoring the function to return an error code and
pass the reference via an out-pointer.
|
|
|
db301087
|
2019-10-24T12:17:02
|
|
config_file: remove unused includes
|
|
|
c2749849
|
2019-10-24T12:00:11
|
|
config_file: rename function names
As with the predecessing commit, this commit renames backend functions
of the configuration file backend. This helps to clearly separate
functionality and also to be able to see from backtraces which backend
is currently in use.
|
|
|
b30b04a9
|
2019-11-05T12:34:14
|
|
config_snapshot: rename function names
The configuration snapshot backend has been extracted from the old files
backend back in 2bff84ba4 (config_file: separate out read-only backend,
2019-07-26). To keep code churn manageable, the local functions weren't
renamed yet and thus still have references to the old diskfile backend.
Rename them accordingly to make them easier to understand.
|
|
|
82d7a114
|
2019-11-05T11:18:14
|
|
Merge pull request #5293 from csware/config_snapshot-snapshot
Fix crash if snapshotting a config_snapshot
|
|
1886478d
|
2019-11-05T07:45:11
|
|
fix a bug introduced in 8a23597b
|
|
|
bf2911d7
|
2019-11-02T07:30:32
|
|
Merge pull request #5275 from pks-t/pks/reflogs-with-newlines
reflogs: fix behaviour around reflogs with newlines
|
|
|
dadbb33b
|
2019-11-01T18:55:54
|
|
Fix crash if snapshotting a config_snapshot
Signed-off-by: Sven Strickroth <email@cs-ware.de>
|
|
718f24ad
|
2019-10-30T20:39:03
|
|
commit: verify objects exist in git_commit_with_signature
There can be a significant difference between the system where we created the
buffer (if at all) and when the caller provides us with the contents of a
commit.
Verify that the commit we are being asked to create references objects which do
exist in the target repository.
|
|
|
2a7d6de3
|
2019-10-29T07:52:31
|
|
Merge pull request #5276 from pks-t/pks/patch-fuzzing-fixes
patch_parse: fixes for fuzzing errors
|
|
3f998aee
|
2019-10-26T17:21:29
|
|
Follow 308 redirect in WinHTTP transport
|
|
|
a31f4c4b
|
2019-10-24T13:16:03
|
|
Merge pull request #5227 from ddevault/check
apply: add GIT_APPLY_CHECK
|
|
|
c405f231
|
2019-10-24T10:26:43
|
|
Merge pull request #5264 from henkesn/refs-unlock-on-commit
refs: unlock unmodified refs on transaction commit
|
|
02af1fcb
|
2019-09-14T14:03:36
|
|
apply: add GIT_APPLY_CHECK
This adds an option which will check if a diff is applicable without
actually applying it; equivalent to git apply --check.
|
|
|
37141ff7
|
2019-10-21T18:56:59
|
|
patch_parse: detect overflow when calculating old/new line position
When the patch contains lines close to INT_MAX, then it may happen that
we end up with an integer overflow when calculating the line of the
current diff hunk. Reject such patches as unreasonable to avoid the
integer overflow.
As the calculation is performed on integers, we introduce two new
helpers `git__add_int_overflow` and `git__sub_int_overflow` that perform
the integer overflow check in a generic way.
|
|
|
468e3ddc
|
2019-10-19T16:48:11
|
|
patch_parse: fix out-of-bounds read with No-NL lines
We've got two locations where we copy lines into the patch. The first
one is when copying normal " ", "-" or "+" lines, while the second
location gets executed when we copy "\ No newline at end of file" lines.
While the first one correctly uses `git__strndup` to copy only until the
newline, the other one doesn't. Thus, if the line occurs at the end of
the patch and if there is no terminating NUL character, then it may
result in an out-of-bounds read.
Fix the issue by using `git__strndup`, as was already done in the other
location. Furthermore, add allocation checks to both locations to detect
out-of-memory situations.
|
|
|
6c6c15e9
|
2019-10-19T15:52:35
|
|
patch_parse: reject empty path names
When parsing patch headers, we currently accept empty path names just
fine, e.g. a line "--- \n" would be parsed as the empty filename. This
is not a valid patch format and may cause `NULL` pointer accesses at a
later place as `git_buf_detach` will return `NULL` in that case.
Reject such patches as malformed with a nice error message.
|
|
|
223e7e43
|
2019-10-19T15:42:54
|
|
patch_parse: reject patches with multiple old/new paths
It's currently possible to have patches with multiple old path name
headers. As we didn't check for this case, this resulted in a memory
leak when overwriting the old old path with the new old path because we
simply discarded the old pointer.
Instead of fixing this by free'ing the old pointer, we should reject
such patches altogether. It doesn't make any sense for the "---" or
"+++" markers to occur multiple times within a patch n the first place.
This also implicitly fixes the memory leak.
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7968e90f
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2019-10-18T12:33:07
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refdb_fs: properly parse corrupted reflogs
In previous versions, libgit2 could be coerced into writing reflog
messages with embedded newlines into the reflog by using
`git_stash_save` with a message containing newlines. While the root
cause is fixed now, it was noticed that upstream git is in fact able to
read such corrupted reflog messages just fine.
Make the reflog parser more lenient in order to just skip over
malformatted reflog lines to bring us in line with git. This requires us
to change an existing test that verified that we do indeed _fail_ to
parse such logs.
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8532ed11
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2019-10-18T12:14:19
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refdb_fs: convert reflog parsing to use parser
The refdb_fs code to parse the reflog currently uses a hand-rolled
parser. Convert it to use our `git_parse_ctx` structure instead.
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d8233feb
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2019-10-18T09:24:14
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reflog: allow adding entries with newlines in their message
Currently, the reflog disallows any entries that have a message with
newlines, as that would effectively break the reflog format, which may
contain a single line per entry, only. Upstream git behaves a bit
differently, though, especially when considering stashes: instead of
rejecting any reflog entry with newlines, git will simply replace
newlines with spaces. E.g. executing 'git stash push -m "foo\nbar"' will
create a reflog entry with "foo bar" as entry message.
This commit adjusts our own logic to stop rejecting commit messages with
newlines. Previously, this logic was part of `git_reflog_append`, only.
There is a second place though where we add reflog entries, which is the
serialization code in the filesystem refdb. As it didn't contain any
sanity checks whatsoever, the refdb would have been perfectly happy to
write malformatted reflog entries to the disk. This is being fixed with
the same logic as for the reflog itself.
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28481609
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2019-10-18T09:41:20
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stash: refactor code that prepares commit messages
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ca2d34a8
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2019-10-18T09:06:48
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stash: modernize code style of `git_stash_save`
The code style of `git_stash_save` doesn't really match our current
coding style. Update it to match our current policies more closely.
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c9464bf7
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2019-10-17T18:33:12
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Merge pull request #5273 from dlax/parse-diff-without-extended-headers
patch_parse: handle patches without extended headers
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47531f47
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2019-10-11T12:44:09
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refs: unlock unmodified refs on transaction commit
Refs which are locked in a transaction without an altered target,
still should to be unlocked on `git_transaction_commit`.
`git_transaction_free` also unlocks refs but the moment of calling of `git_transaction_free`
cannot be controlled in all situations.
Some binding libs call `git_transaction_free` on garbage collection or not at all if the
application exits before and don't provide public access to `git_transaction_free`.
It is better to release locks as soon as possible.
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3c5d78bd
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2019-05-01T16:16:26
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submodule: provide a wrapper for simple submodule clone steps
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11de594f
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2019-10-16T22:11:33
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patch_parse: handle patches without extended headers
Extended header lines (especially the "index <hash>..<hash> <mode>") are
not required by "git apply" so it import patches. So we allow the
from-file/to-file lines (--- a/file\n+++ b/file) to directly follow the
git diff header.
This fixes #5267.
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dbc17a7e
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2019-09-21T08:46:08
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negotiate: use GSS.framework on macOS
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0eecb660
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2019-10-13T13:53:18
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cmake: remove extra GIT_NTLM define
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aa234ac0
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2019-09-21T08:47:01
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util: hide helper qsort code to silence unused functions warning
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ef5a3851
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2019-10-11T07:47:17
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Merge pull request #5257 from henkesn/master
Fix file locking on POSIX OS
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1f9b4970
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2019-10-11T07:44:10
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Merge pull request #5260 from pks-t/pks/cmake3
cmake: update minimum CMake version to v3.5.1
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3335a034
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2019-10-10T15:28:46
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refs: fix locks getting forcibly removed
The flag GIT_FILEBUF_FORCE currently does two things:
1. It will cause the filebuf to create non-existing leading
directories for the file that is about to be written.
2. It will forcibly remove any pre-existing locks.
While most call sites actually do want (1), they do not want to
remove pre-existing locks, as that renders the locking mechanisms
effectively useless.
Introduce a new flag `GIT_FILEBUF_CREATE_LEADING_DIRS` to
separate both behaviours cleanly from each other and convert
callers to use it instead of `GIT_FILEBUF_FORCE` to have them
honor locked files correctly.
As this conversion removes all current users of `GIT_FILEBUF_FORCE`,
this commit removes the flag altogether.
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6716e2f3
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2019-10-10T12:34:45
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Merge pull request #5248 from dlax/parse-patch-empty-files
patch_parse: handle patches with new empty files
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ebabb88f
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2019-10-10T09:25:32
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cmake: update minimum CMake version to v3.5.1
Back in commit cf9f34521 (cmake: bump minimum version to 2.8.11,
2017-09-06), we have bumped the minimum CMake version to require at
least v2.8.11. The main hold-backs back then were distributions like
RHEL/CentOS as well as Ubuntu Trusty, which caused us to not target a
more modern version. Nowadays, Ubuntu Trusty has been EOL'd and CentOS 6
has CMake v3.6.1 available via the EPEL6 repository, and thus it seems
fair to upgrade to a more recent version.
Going through repology [1], one can see that all supported mainstream
distributions do in fact have CMake 3 available. Going through the list,
the minimum version that is supported by all mainstream distros is in
fact v3.5.1:
- CentOS 6 via EPEL6: 3.6.1
- Debian Oldstable: 3.7.2
- Fedora 26: 3.8.2
- OpenMandriva 3.x: 3.5.1
- Slackware 14.2: 3.5.2
- Ubuntu 16.04: 3.5.1
Consequentally, let's upgrade CMake to the minimum version of 3.5.1 and
remove all the version CMake checks that aren't required anymore.
[1]: https://repology.org/project/cmake/versions
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f04a58b0
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2019-10-03T12:55:48
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Merge pull request #4445 from tiennou/shallow/dry-commit-parsing
DRY commit parsing
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5cf17e0f
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2019-10-03T09:39:42
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commit_list: store in/out-degrees as uint16_t
The commit list's in- and out-degrees are currently stored as `unsigned
short`. When assigning it the value of `git_array_size`, which returns
an `size_t`, this generates a warning on some Win32 platforms due to
loosing precision.
We could just cast the returned value of `git_array_size`, which would
work fine for 99.99% of all cases as commits typically have less than
2^16 parents. For crafted commits though we might end up with a wrong
value, and thus we should definitely check whether the array size
actually fits into the field.
To ease the check, let's convert the fields to store the degrees as
`uint16_t`. We shouldn't rely on such unspecific types anyway, as it may
lead to different behaviour across platforms. Furthermore, this commit
introduces a new `git__is_uint16` function to check whether it actually
fits -- if not, we return an error.
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5988cf34
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2017-12-15T18:11:51
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commit_list: unify commit information parsing
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1c847a6a
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2018-10-25T19:40:19
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commit: generic parse mechanism
This allows us to pick which data from a commit we're interested in.
This will be used by the revwalk code, which is only interested in
parents' and committer data.
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63307cba
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2019-09-28T17:32:18
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Merge pull request #5226 from pks-t/pks/regexp-api
regexp: implement a new regular expression API
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b61810bf
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2019-09-28T15:52:25
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patch_parse: handle patches with new empty files
Patches containing additions of empty files will not contain diff data
but will end with the index header line followed by the terminating
sequence "-- ". We follow the same logic as in cc4c44a and allow "-- "
to immediately follow the index header.
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70325370
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2019-09-27T11:16:02
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Merge pull request #5106 from tiennou/fix/ref-api-fixes
git_refdb API fixes
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452b7f8f
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2019-09-25T20:29:21
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Don't use enum for flags
Using an `enum` causes trouble when used with C++ as bitwise operations are not possible w/o casting (e.g., `opts.flags &= ~GIT_BLOB_FILTER_CHECK_FOR_BINARY;` is invalid as there is no `&=` operator for `enum`).
Signed-off-by: Sven Strickroth <email@cs-ware.de>
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3c1aa232
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2019-09-21T16:09:00
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Merge pull request #5232 from pks-t/pks/buffer-ensure-size-oom
buffer: fix writes into out-of-memory buffers
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f585b129
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2019-09-12T14:29:28
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posix: remove superseded POSIX regex wrappers
The old POSIX regex wrappers have been superseded by our own regexp API
that provides a higher-level abstraction. Remove the POSIX wrappers in
favor of the new one.
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7aacf027
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2019-09-13T08:55:33
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global: convert all users of POSIX regex to use our new regexp API
The old POSIX regex API has been superseded by our new regexp API.
Convert all users to make use of the new one.
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d77378eb
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2019-09-13T08:54:26
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regexp: implement new regular expression API
We currently support a set of different regular expression backends with
PCRE, PCRE2, regcomp(3P) and regcomp_l(3). The current implementation of
this is done via a simple POSIX wrapper that either directly uses
supplied functions or that is a very small wrapper.
To support PCRE and PCRE2, we use their provided <pcreposix.h> and
<pcre2posix.h> wrappers. These wrappers are implemented in such a way
that the accompanying libraries pcre-posix and pcre2-posix provide the
same symbols as the libc ones, namely regcomp(3P) et al. This works out
on some systems just fine, most importantly on glibc-based ones, where
the regular expression functions are implemented as weak aliases and
thus get overridden by linking in the pcre{,2}-posix library. On other
systems we depend on the linking order of libc and pcre library, and as
libc always comes first we will end up with the functions of the libc
implementation. As a result, we may use the structures `regex_t` and
`regmatch_t` declared by <pcre{,2}posix.h>, but use functions defined by
the libc, leading to segfaults.
The issue is not easily solvable. Somed distributions like Debian have
resolved this by patching PCRE and PCRE2 to carry custom prefixes to all
the POSIX function wrappers. But this is not supported by upstream and
thus inherently unportable between distributions. We could instead try
to modify linking order, but this starts becoming fragile and will not
work e.g. when libgit2 is loaded via dlopen(3P) or similar ways. In the
end, this means that we simply cannot use the POSIX wrappers provided by
the PCRE libraries at all.
Thus, this commit introduces a new regular expression API. The new API
is on a tad higher level than the previous POSIX abstraction layer, as
it tries to abstract away any non-portable flags like e.g. REG_EXTENDED,
which has no equivalents in all of our supported backends. As there are
no users of POSIX regular expressions that do _not_ reguest REG_EXTENDED
this is fine to be abstracted away, though. Due to the API being
higher-level than before, it should generally be a tad easier to use
than the previous one.
Note: ideally, the new API would've been called `git_regex_foobar` with
a file "regex.h" and "regex.c". Unfortunately, this is currently
impossible to implement due to naming clashes between the then-existing
"regex.h" and <regex.h> provided by the libc. As we add the source
directory of libgit2 to the header search path, an include of <regex.h>
would always find our own "regex.h". Thus, we have to take the bitter
pill of adding one more character to all the functions to disambiguate
the includes.
To improve guarantees around cross-backend compatibility, this commit
also brings along an improved regular expression test suite
core::regexp.
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174b7a32
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2019-09-19T12:24:06
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buffer: fix printing into out-of-memory buffer
Before printing into a `git_buf` structure, we always call `ENSURE_SIZE`
first. This macro will reallocate the buffer as-needed depending on
whether the current amount of allocated bytes is sufficient or not. If
`asize` is big enough, then it will just do nothing, otherwise it will
call out to `git_buf_try_grow`. But in fact, it is insufficient to only
check `asize`.
When we fail to allocate any more bytes e.g. via `git_buf_try_grow`,
then we set the buffer's pointer to `git_buf__oom`. Note that we touch
neither `asize` nor `size`. So if we just check `asize > targetsize`,
then we will happily let the caller of `ENSURE_SIZE` proceed with an
out-of-memory buffer. As a result, we will print all bytes into the
out-of-memory buffer instead, resulting in an out-of-bounds write.
Fix the issue by having `ENSURE_SIZE` verify that the buffer is not
marked as OOM. Add a test to verify that we're not writing into the OOM
buffer.
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208f1d7a
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2019-09-19T12:46:37
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buffer: fix infinite loop when growing buffers
When growing buffers, we repeatedly multiply the currently allocated
number of bytes by 1.5 until it exceeds the requested number of bytes.
This has two major problems:
1. If the current number of bytes is tiny and one wishes to resize
to a comparatively huge number of bytes, then we may need to loop
thousands of times.
2. If resizing to a value close to `SIZE_MAX` (which would fail
anyway), then we probably hit an infinite loop as multiplying the
current amount of bytes will repeatedly result in integer
overflows.
When reallocating buffers, one typically chooses values close to 1.5 to
enable re-use of resulting memory holes in later reallocations. But
because of this, it really only makes sense to use a factor of 1.5
_once_, but not looping until we finally are able to fit it. Thus, we
can completely avoid the loop and just opt for the much simpler
algorithm of multiplying with 1.5 once and, if the result doesn't fit,
just use the target size. This avoids both problems of looping
extensively and hitting overflows.
This commit also adds a test that would've previously resulted in an
infinite loop.
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3e8a17b0
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2019-09-21T15:18:42
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buffer: fix memory leak if unable to grow buffer
If growing a buffer fails, we set its pointer to the static
`git_buf__oom` structure. While we correctly free the old pointer if
`git__malloc` returned an error, we do not free it if there was an
integer overflow while calculating the new allocation size. Fix this
issue by freeing the pointer to plug the memory leak.
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49a3289e
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2019-09-21T08:25:23
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cred: add missing private header in GSSAPI block
Should have been part of 8bf0f7eb26c65b2b937b1f40a384b9b269b0b76d
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aa407ca3
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2019-09-19T13:23:59
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Merge pull request #5206 from tiennou/cmake/pkgconfig-building
CMake pkg-config modulification
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564b3ffc
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2019-08-17T12:34:59
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cmake: add missing requires to the .pc file
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d80d9d56
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2019-08-17T12:17:21
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cmake: streamline *.pc file handling via a module
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8bf0f7eb
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2019-09-09T13:00:27
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cred: separate public interface from low-level details
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5d8a4659
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2019-09-13T10:31:49
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Merge pull request #5195 from tiennou/fix/commitish-smart-push
smart: use push_glob instead of manual filtering
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