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Git 2.37.4 Release Notes
========================
This primarily is to backport various fixes accumulated on the 'master'
front since 2.37.3, and also includes the same security fixes as in
v2.30.6.
Fixes since v2.37.3
-------------------
* CVE-2022-39253:
When relying on the `--local` clone optimization, Git dereferences
symbolic links in the source repository before creating hardlinks
(or copies) of the dereferenced link in the destination repository.
This can lead to surprising behavior where arbitrary files are
present in a repository's `$GIT_DIR` when cloning from a malicious
repository.
Git will no longer dereference symbolic links via the `--local`
clone mechanism, and will instead refuse to clone repositories that
have symbolic links present in the `$GIT_DIR/objects` directory.
Additionally, the value of `protocol.file.allow` is changed to be
"user" by default.
Credit for finding CVE-2022-39253 goes to Cory Snider of Mirantis.
The fix was authored by Taylor Blau, with help from Johannes
Schindelin.
* CVE-2022-39260:
An overly-long command string given to `git shell` can result in
overflow in `split_cmdline()`, leading to arbitrary heap writes and
remote code execution when `git shell` is exposed and the directory
`$HOME/git-shell-commands` exists.
`git shell` is taught to refuse interactive commands that are
longer than 4MiB in size. `split_cmdline()` is hardened to reject
inputs larger than 2GiB.
Credit for finding CVE-2022-39260 goes to Kevin Backhouse of
GitHub. The fix was authored by Kevin Backhouse, Jeff King, and
Taylor Blau.
* An earlier optimization discarded a tree-object buffer that is
still in use, which has been corrected.
* Fix deadlocks between main Git process and subprocess spawned via
the pipe_command() API, that can kill "git add -p" that was
reimplemented in C recently.
* xcalloc(), imitating calloc(), takes "number of elements of the
array", and "size of a single element", in this order. A call that
does not follow this ordering has been corrected.
* The preload-index codepath made copies of pathspec to give to
multiple threads, which were left leaked.
* Update the version of Ubuntu used for GitHub Actions CI from 18.04
to 22.04.
* The auto-stashed local changes created by "git merge --autostash"
was mixed into a conflicted state left in the working tree, which
has been corrected.
Also contains other minor documentation updates and code clean-ups.
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