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msysgit / git

msysGit-based Git for Windows 1.x is now superseded by Git for Windows 2.x
http://github.com/git-for-windows/git
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Is "valid path" checking overly strict? #296

Closed kosak closed 9 years ago

kosak commented 9 years ago

I notice in Git-1.9.5-preview20141217 that some previously-allowed paths are considered invalid.

I suppose this is due to CVE-2014-9390, but I wonder if the path checking is too strict. For example zzz~1.zzz is now invalid:

$ git init testrepo
$ cd testrepo
$ touch zzz~1.zzz
$ git add zzz~1.zzz
error: Invalid path 'zzz~1.zzz'
error: unable to add zzz~1.zzz to index
fatal: adding files failed

I've confirmed the above works without error in Git-1.9.4-preview20140815 I'm not certain this is a bug; I don't really know the total scope of the change... but I was assuming it was limited to paths that look too much like ".git"

dscho commented 9 years ago

I wonder if the path checking is too strict. For example zzz~1.zzz is now invalid

Yes, correct. zzz~1.zzz can conflict with a short name. For example, if you already have a file (possibly untracked) of the name zzz.is-a-long-name.zzz, its short name will be zzz~1.zzz and it could be overwritten by a pull if we allowed such names.

Therefore, 1.9.5 indeed fixes a bug.

If you need to work with such files that possibly damage your collaborators working directories, you will have to ask them to set the config variable core.protectNTFS to false, but you will also have to explain to them that they open their working directories to serious problems.