Daan De Meyer
b7ae93f093
null_or_empty_path_with_root() passes a path that already includes the root to chase_and_stat() with CHASE_PREFIX_ROOT, so the root is added twice. It also only recognizes /dev/null when the path itself is /dev/null. Below a root, a symlink to an empty file therefore fails with ENOENT. A symlink to /dev/null fails the same way when the image has no /dev/null. Resolve the symlink inside the root without requiring the target to exist, and stat the target through the O_PATH fd that chase() returns. chase() accepts ret_fd together with CHASE_NONEXISTENT and sets the fd to -EBADF when the target is missing. Its comment says that ret_fd cannot be combined with CHASE_NONEXISTENT. Fix the comment. (cherry picked from commit f2b0c29597466bdcc800dcfa8da4c8192fb9e824)
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