What is the exact purpose of `mask` in file system ACL?

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When I apply default ACL in a directory I see default:mask or just mask in the following two scenario.



Scenario 1



-bash-4.2$ ls -ld test/
 drwxr-x---. 2 test test 4096 Oct 15 19:12 test/

-bash-4.2$ setfacl -d -m u:arif:rwx test/

-bash-4.2$ getfacl --omit-header test
 user::rwx
 group::r-x
 other::---
 default:user::rwx
 default:user:arif:rwx
 default:group::r-x
 default:mask::rwx
 default:other::---


Scenario 2



-bash-4.2$ ls -dl dir/
 drwxr-x---. 2 test test 4096 Oct 15 18:17 dir/

-bash-4.2$ getfacl dir
 # file: dir
 # owner: test
 # group: test
 user::rwx
 group::r-x
 other::---

-bash-4.2$ setfacl -m user:arif:rwx dir

-bash-4.2$ getfacl --omit-header dir
 user::rwx
 user:arif:rwx
 group::r-x
 mask::rwx
 other::---


So what is the purpose of mask here?






linux permissions acl umask






share

























    up vote
    0
    down vote

    favorite












    When I apply default ACL in a directory I see default:mask or just mask in the following two scenario.



    Scenario 1



    -bash-4.2$ ls -ld test/
     drwxr-x---. 2 test test 4096 Oct 15 19:12 test/

    -bash-4.2$ setfacl -d -m u:arif:rwx test/

    -bash-4.2$ getfacl --omit-header test
     user::rwx
     group::r-x
     other::---
     default:user::rwx
     default:user:arif:rwx
     default:group::r-x
     default:mask::rwx
     default:other::---


    Scenario 2



    -bash-4.2$ ls -dl dir/
     drwxr-x---. 2 test test 4096 Oct 15 18:17 dir/

    -bash-4.2$ getfacl dir
     # file: dir
     # owner: test
     # group: test
     user::rwx
     group::r-x
     other::---

    -bash-4.2$ setfacl -m user:arif:rwx dir

    -bash-4.2$ getfacl --omit-header dir
     user::rwx
     user:arif:rwx
     group::r-x
     mask::rwx
     other::---


    So what is the purpose of mask here?






    linux permissions acl umask






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      When I apply default ACL in a directory I see default:mask or just mask in the following two scenario.



      Scenario 1



      -bash-4.2$ ls -ld test/
       drwxr-x---. 2 test test 4096 Oct 15 19:12 test/

      -bash-4.2$ setfacl -d -m u:arif:rwx test/

      -bash-4.2$ getfacl --omit-header test
       user::rwx
       group::r-x
       other::---
       default:user::rwx
       default:user:arif:rwx
       default:group::r-x
       default:mask::rwx
       default:other::---


      Scenario 2



      -bash-4.2$ ls -dl dir/
       drwxr-x---. 2 test test 4096 Oct 15 18:17 dir/

      -bash-4.2$ getfacl dir
       # file: dir
       # owner: test
       # group: test
       user::rwx
       group::r-x
       other::---

      -bash-4.2$ setfacl -m user:arif:rwx dir

      -bash-4.2$ getfacl --omit-header dir
       user::rwx
       user:arif:rwx
       group::r-x
       mask::rwx
       other::---


      So what is the purpose of mask here?






      linux permissions acl umask






      share













      When I apply default ACL in a directory I see default:mask or just mask in the following two scenario.



      Scenario 1



      -bash-4.2$ ls -ld test/
       drwxr-x---. 2 test test 4096 Oct 15 19:12 test/

      -bash-4.2$ setfacl -d -m u:arif:rwx test/

      -bash-4.2$ getfacl --omit-header test
       user::rwx
       group::r-x
       other::---
       default:user::rwx
       default:user:arif:rwx
       default:group::r-x
       default:mask::rwx
       default:other::---


      Scenario 2



      -bash-4.2$ ls -dl dir/
       drwxr-x---. 2 test test 4096 Oct 15 18:17 dir/

      -bash-4.2$ getfacl dir
       # file: dir
       # owner: test
       # group: test
       user::rwx
       group::r-x
       other::---

      -bash-4.2$ setfacl -m user:arif:rwx dir

      -bash-4.2$ getfacl --omit-header dir
       user::rwx
       user:arif:rwx
       group::r-x
       mask::rwx
       other::---


      So what is the purpose of mask here?






      linux permissions acl umask




      linux permissions acl umask





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      asked 3 mins ago









      muhammad

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