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On debian-based systems, the tor logging directory has the permissions

$ ls -ald /var/log/tor/
drwxr-s--- ... /var/log/tor/

Why is this so? Is this a security vulnerability?

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According to Wikipedia, setting the set_gid bit on directories has a different meaning than with files:

Setting the setgid permission on a directory ("chmod g+s") causes new files and subdirectories created within it to inherit its group ID, rather than the primary group ID of the user who created the file

From this, it seems as though it is intended and ok.

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