On 2022-04-07 at 21:53:26, Justin Steven wrote: > Hi all, > > I'm the author of one of the articles linked in Glen's mail. Thank you > Glen for summarising the problem beautifully and pushing this forward. > > Brian said: > > As mentioned elsewhere, git status doesn't work without a working tree. > > This is correct. However, it is possible to embed a bare repo that has > its own core.worktree which points to a directory within the > containing repo, satisfying the requirement of having a working tree. > This is covered in the article [1] and looks to be accounted for in > Taylor's reproducer script which admittedly I haven't run. > > > Instead, I'd rather see us avoid executing any program from the config > > or any hooks in a bare repository without a working tree (except for > > pushes). I think that would avoid breaking things while still improving > > security. > > Due to the fact that the embedded bare repo can be made to have a > working tree, this won't be an effective fix. Then we'd probably be better off just walking up the entire hierarchy and excluding worktrees from embedded bare repositories, or otherwise restricting the config we read. That will probably mean we'll need to walk the entire directory hierarchy to see if it's embedded (or at least to the root of the device) in such a case, but that should be relatively uncommon. I'd definitely like to see us make a security improvement here, but I also would like to avoid us breaking a lot of repositories, especially since we lack alternatives. If git fast-import could 100% correctly round-trip all commits and repositories, I would be much more open to blocking this in fsck after a deprecation period, but as it stands that's not possible. Perhaps improving that would be a suitable way forward. -- brian m. carlson (he/him or they/them) Toronto, Ontario, CA
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