[1.1 backport] Prohibit /proc and /sys to be symlinks #3785
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Commit 3291d66 introduced a check for /proc and /sys, making sure the destination (dest) is a directory (and not e.g. a symlink). Later, a hunk from commit 0ca91f4 switched from using filepath.Join to SecureJoin for dest. As SecureJoin follows and resolves symlinks, the check whether dest is a symlink no longer works. To fix, do the check without/before using SecureJoin. Add integration tests to make sure we won't regress. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> (cherry picked from commit 0d72adf) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
AkihiroSuda
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Commit 3291d66 introduced a check for /proc and /sys, making sure the destination (dest) is a directory (and not e.g. a symlink).
Later, a hunk from commit 0ca91f4 switched from using filepath.Join to SecureJoin for dest. As SecureJoin follows and resolves symlinks, the check whether dest is a symlink no longer works.
To fix, do the check without/before using SecureJoin.
Add integration tests to make sure we won't regress.
(cherry picked from commit 0d72adf)