Leaving shell variables un-quotes can lead to security vulnerabilities. In:
: ${x=.}
`$x` is always expanded, cause `glob+split` on its result. There're some
globs is too expensive to expand, like:
x='/*/*/*/*/../../../../*/*/*/*/../../../../*/*/*/*' sh -c ': ${x=.}'
Run it and our machine will hang/crash (especially in Linux).
`LESS`, `LV` and `GIT_OBJECT_DIRECTORY` variables in `git-sh-setup` are
vulnerable with this case.
Fix this vulnerability by quoting those variables.
Signed-off-by: LE Manh Cuong <[email protected]>
---
git-sh-setup.sh | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index c48139a..85db5f1 100644
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -160,8 +160,8 @@ git_pager() {
else
GIT_PAGER=cat
fi
- : ${LESS=-FRX}
- : ${LV=-c}
+ : "${LESS=-FRX}"
+ : "${LV=-c}"
export LESS LV
eval "$GIT_PAGER" '"$@"'
@@ -344,7 +344,7 @@ git_dir_init () {
echo >&2 "Unable to determine absolute path of git directory"
exit 1
}
- : ${GIT_OBJECT_DIRECTORY="$(git rev-parse --git-path objects)"}
+ : "${GIT_OBJECT_DIRECTORY="$(git rev-parse --git-path objects)"}"
}
if test -z "$NONGIT_OK"
--
2.9.0
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