Zbigniew Jędrzejewski-Szmek
5b1cf7a9be
To remove directory structures, we need to remove the innermost items first, and then recursively remove higher-level directories. We would recursively descend into directories and invoke rm_rf_children and rm_rm_children_inner. This is problematic when too many directories are nested. Instead, let's create a "TODO" queue. In the the queue, for each level we hold the DIR* object we were working on, and the name of the directory. This allows us to leave a partially-processed directory, and restart the removal loop one level down. When done with the inner directory, we use the name to unlinkat() it from the parent, and proceed with the removal of other items. Because the nesting is increased by one level, it is best to view this patch with -b/--ignore-space-change. This fixes CVE-2021-3997, https://bugzilla.redhat.com/show_bug.cgi?id=2024639. The issue was reported and patches reviewed by Qualys Team. Mauro Matteo Cascella and Riccardo Schirone from Red Hat handled the disclosure.
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