Re: [PATCH] symlink.7: expound upon fs.protected_symlinks

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* наб <nabijaczleweli@xxxxxxxxxxxxxxxxxx>, 2023-03-25 22:00:
-The only time that the ownership of a symbolic link matters is
-when the link is being removed or renamed in a directory that
-has the sticky bit set (see
-.BR stat (2)).

Wait, but stat.2 doesn't say anything about the sticky bit?

Oh, apparently this info was removed in e8ff4f53ab9a7cbd ("Remove information migrated to inode(7) page").

+Only when a symbolic link is in a sticky directory (see
+.BR stat (2))
+does its ownership matter\[em]deletions and renames are subject
+to standard semantics.

That's weird phrasing. What was wrong with the original sentence?

+Additionally, if the
+.I fs.protected_symlinks
+sysctl is set, a symbolic link may only be followed if:

FWIW, this is also documented in proc.5; not sure if we need it in two places.

+\[bu] owned by the user which follows it, or

s/which/who/?

+\[bu] owned by the same user which owns the directory it resides in.

Ditto.

--
Jakub Wilk



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