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| author |  Johannes Schindelin <johannes.schindelin@gmx.de> | 2019-09-12 14:54:05 +0200 |
|---|---|---|
| committer | Johannes Schindelin <johannes.schindelin@gmx.de> | 2019-12-04 13:20:05 +0100 |
| commit | e1d911dd4c7b76a5a8cec0f5c8de15981e34da83 (patch) | |
| tree | c3e36cceeadde0713a1f154b075ca1176f1b4a8b /t/t7415-submodule-names.sh | |
| parent | clone --recurse-submodules: prevent name squatting on Windows (diff) | |
| download | tgif-e1d911dd4c7b76a5a8cec0f5c8de15981e34da83.tar.xz | |
mingw: disallow backslash characters in tree objects' file names
The backslash character is not a valid part of a file name on Windows.
Hence it is dangerous to allow writing files that were unpacked from
tree objects, when the stored file name contains a backslash character:
it will be misinterpreted as directory separator.
This not only causes ambiguity when a tree contains a blob `a\b` and a
tree `a` that contains a blob `b`, but it also can be used as part of an
attack vector to side-step the careful protections against writing into
the `.git/` directory during a clone of a maliciously-crafted
repository.
Let's prevent that, addressing CVE-2019-1354.
Note: we guard against backslash characters in tree objects' file names
_only_ on Windows (because on other platforms, even on those where NTFS
volumes can be mounted, the backslash character is _not_ a directory
separator), and _only_ when `core.protectNTFS = true` (because users
might need to generate tree objects for other platforms, of course
without touching the worktree, e.g. using `git update-index
--cacheinfo`).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Diffstat (limited to 't/t7415-submodule-names.sh')
| -rwxr-xr-x | t/t7415-submodule-names.sh | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/t/t7415-submodule-names.sh b/t/t7415-submodule-names.sh index e1cd0a3545..7c65e7a35c 100755 --- a/t/t7415-submodule-names.sh +++ b/t/t7415-submodule-names.sh @@ -89,16 +89,18 @@ test_expect_success MINGW 'prevent git~1 squatting on Windows' ' git hash-object -w --stdin)" && rev="$(git rev-parse --verify HEAD)" && hash="$(echo x | git hash-object -w --stdin)" && - git update-index --add \ + git -c core.protectNTFS=false update-index --add \ --cacheinfo 100644,$modules,.gitmodules \ --cacheinfo 160000,$rev,c \ --cacheinfo 160000,$rev,d\\a \ --cacheinfo 100644,$hash,d./a/x \ --cacheinfo 100644,$hash,d./a/..git && test_tick && - git commit -m "module" + git -c core.protectNTFS=false commit -m "module" && + test_must_fail git show HEAD: 2>err && + test_i18ngrep backslash err ) && - test_must_fail git \ + test_must_fail git -c core.protectNTFS=false \ clone --recurse-submodules squatting squatting-clone 2>err && test_i18ngrep "directory not empty" err && ! grep gitdir squatting-clone/d/a/git~2 |