linux:special_permissions_minihowto
[DOC] Linux special permissions
Meanings
Special Permissions | On a File | On a Directory |
SUID or Set User ID | A program is executed with the file owner's permissions (rather than with the permissions of the user who executes it). | Files created in the directory inherit its UID. |
SGID or Set Group ID | he effective group of an executing program is the file owner group. | Files created in the directory inherit its GID. |
Sticky (bit) | A program sticks in memory after execution. | Any user can create files, but only the owner of a file can delete it. |
Reading
Permissions | Meaning |
--S------
| SUID is set, but user (owner) execute is not set. |
--s------
| SUID and user execute are both set. |
-----S---
| SGID is set, but group execute is not set. |
-----s---
| SGID and group execute are both set. |
--------T
| Sticky bit is set, bot other execute is not set. |
--------t
| Sticky bit and other execute are both set. |
Applying
Permissions | Apply | Ressult |
--S------
| chmod 4000 file
| ---S------ 1 root root 0 May 15 11:14 file
|
--s------
| chmod 4100 file
| ---s------ 1 root root 0 May 15 11:14 file
|
-----S---
| chmod 2000 file
| ------S--- 1 root root 0 May 15 11:14 file
|
-----s---
| chmod 2010 file
| ------s--- 1 root root 0 May 15 11:14 file
|
--------T
| chmod 1000 file
| ---------T 1 root root 0 May 15 11:14 file
|
--------t
| chmod 1001 file
| ---------t 1 root root 0 May 15 11:14 file
|
linux/special_permissions_minihowto.txt · Last modified: 2022/02/11 11:36 by 127.0.0.1