Follow-up Comment #1, bug #42318 (project findutils): Should be renamed to: "find -mount (or -xdev) is listing permission for root directory of other mounted filesystem."
https://www.gnu.org/software/findutils/manual/html_mono/find.html#Filesystems --- [...] Don't descend directories on other filesystems. These options are synonyms. [...] --- root directory in a filesystem is a directory (everything is a file), even if mounted not in system root. So root directory reside always in the mounted filesystem, as permission. To put it in other terms: Taking in consideration ext4, when a filesystem is mounted, the permission on the root directory for the mounted filesystem are taken from the root directory of the mounted filesystem itself. The same apply to all *nix filesystem that handle permissions, including NFS. Suppose to have: /mnt/testmount, a directory with no content and permission 755 mount then /dev/mapper/myvg-mounttest in this directory. The root directory of this filesystem already has permission set to 777. ls -l will show 777 now for the same directory. This is fine. If find with -mount is used to spot all 777 permissions, this will be listed. Result should be instead: 1) no entries for that mountpoint at all (because of -mount this is effectively not in our find) 2) the directory entry with permission of the original filesystem directory (likely not possible) Maybe worth the case to check also other OS implementation, like AIX and Solaris. Reproducer: Prereq: One disk (local or remote) mounted: /dev/mapper/myvg-mounttest on /mnt/testmount type ext4 (rw,relatime,data=ordered) /dev/mapper/myvg-mounttest 976M 2.6M 907M 1% /mnt/testmount Content of the mounted filesystem: testserver ~ # ls -laR /mnt/ /mnt/: total 12 drwxr-xr-x. 3 root root 4096 Mar 15 14:08 . dr-xr-xr-x. 20 root root 4096 Feb 17 12:30 .. drwxrwxrwx 5 root root 4096 Mar 15 14:16 testmount /mnt/testmount: total 32 drwxrwxrwx 5 root root 4096 Mar 15 14:16 . drwxr-xr-x. 3 root root 4096 Mar 15 14:08 .. -rwxrwxrwx 1 root root 0 Mar 15 14:15 beta drwxr-xr-x 2 root root 4096 Mar 15 14:16 charlie drwx------ 2 root root 16384 Mar 15 14:14 lost+found drwxrwxrwx 2 root root 4096 Mar 15 14:16 sigma /mnt/testmount/charlie: total 8 drwxr-xr-x 2 root root 4096 Mar 15 14:16 . drwxrwxrwx 5 root root 4096 Mar 15 14:16 .. /mnt/testmount/lost+found: total 20 drwx------ 2 root root 16384 Mar 15 14:14 . drwxrwxrwx 5 root root 4096 Mar 15 14:16 .. /mnt/testmount/sigma: total 8 drwxrwxrwx 2 root root 4096 Mar 15 14:16 . drwxrwxrwx 5 root root 4096 Mar 15 14:16 .. -rwxrwxrwx 1 root root 0 Mar 15 14:15 alpha -rw-r--r-- 1 root root 0 Mar 15 14:16 charlie testserver ~ # Steps: testserver ~ # cd /mnt/ testserver mnt # umount testmount/ testserver mnt # ls -la total 12 drwxr-xr-x. 3 root root 4096 Mar 15 14:08 . dr-xr-xr-x. 20 root root 4096 Feb 17 12:30 .. drwxr-xr-x 2 root root 4096 Mar 15 14:08 testmount testserver mnt # find /mnt -mount -perm -o+w -a ! -perm -1000 testserver mnt # mount /dev/myvg/mounttest testmount/ testserver mnt # ls -la total 12 drwxr-xr-x. 3 root root 4096 Mar 15 14:08 . dr-xr-xr-x. 20 root root 4096 Feb 17 12:30 .. drwxrwxr-x 5 root root 4096 Mar 15 14:16 testmount testserver mnt # find /mnt -mount -perm -o+w -a ! -perm -1000 testserver mnt # ls -la testmount/ total 32 drwxrwxr-x 5 root root 4096 Mar 15 14:16 . drwxr-xr-x. 3 root root 4096 Mar 15 14:08 .. -rwxrwxrwx 1 root root 0 Mar 15 14:15 beta drwxr-xr-x 2 root root 4096 Mar 15 14:16 charlie drwx------ 2 root root 16384 Mar 15 14:14 lost+found drwxrwxrwx 2 root root 4096 Mar 15 14:16 sigma testserver mnt # chmod 777 testmount/ testserver mnt # ls -la total 12 drwxr-xr-x. 3 root root 4096 Mar 15 14:08 . dr-xr-xr-x. 20 root root 4096 Feb 17 12:30 .. drwxrwxrwx 5 root root 4096 Mar 15 14:16 testmount testserver mnt # find /mnt -mount -perm -o+w -a ! -perm -1000 /mnt/testmount testserver mnt # umount testmount/ testserver mnt # ls -la total 12 drwxr-xr-x. 3 root root 4096 Mar 15 14:08 . dr-xr-xr-x. 20 root root 4096 Feb 17 12:30 .. drwxr-xr-x 2 root root 4096 Mar 15 14:08 testmount testserver mnt # find /mnt -mount -perm -o+w -a ! -perm -1000 testserver mnt # _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?42318> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/
