Fixes:
* 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.
* 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.
https://github.com/git/git/blob/v2.31.5/Documentation/RelNotes/2.31.5.txt
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
c1d783d4dd