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The previous implementation could still allow for following symlinks while remove_all is running if a directory was replaced with a symlink higher in the tree than remove_all is currently processing. This was reported here: https://github.com/boostorg/filesystem/issues/224#issuecomment-1183738097 The solution is to use POSIX.1-2008 *at APIs to prevent symlink resolution higher in the directory tree while iterating over the subtree in remove_all. This required updating the directory iterator construction interface so that it is possible to pass the base directory fd and return fd of the directory used by the iterator. This is done via platform-specific params that are currently defined only for POSIX. Additionally, status, symlink_status and remove were extended to accept the base directory fd as well. Other systems, including Windows, remain vulnerable. Related to https://github.com/boostorg/filesystem/issues/224. |
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