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Special Permissions (SetUID, SetGID, Sticky Bit)/shaare/cb3cog

  • linux
  • linux

  • chmod u+s xyz.sh → add SetUID (user-level special permission)
  • chmod g+s xyz.sh → add SetGID (group-level special permission)
  • chmod u-s xyz.sh → remove SetUID
  • chmod g-s xyz.sh → remove SetGID
  • find / -perm /6000 -type f → find all executables with SetUID/SetGID

⚠️ SetUID/SetGID works only for C/C++ compiled binaries, not Bash scripts.

Sticky Bit

  • Protects files from deletion by non-owners
  • Example: ls / → shows sticky bit as t in rwxrwxrwt
  • chmod +t file/dir → assign sticky bit

    • Only the creator can delete contents of that folder, even with full permissions
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