text: #ifndef _UAPI_LINUX_SECUREBITS_H
  #define _UAPI_LINUX_SECUREBITS_H
  
  /* Each securesetting is implemented using two bits. One bit specifies
     whether the setting is on or off. The other bit specify whether the
     setting is locked or not. A setting which is locked cannot be
     changed from user-level. */
  #define issecure_mask(X)	(1 << (X))
  
  #define SECUREBITS_DEFAULT 0x00000000
  
  /* When set UID 0 has no special privileges. When unset, we support
     inheritance of root-permissions and suid-root executable under
     compatibility mode. We raise the effective and inheritable bitmasks
     *of the executable file* if the effective uid of the new process is
     0. If the real uid is 0, we raise the effective (legacy) bit of the
     executable file. */
  #define SECURE_NOROOT			0
  #define SECURE_NOROOT_LOCKED		1  /* make bit-0 immutable */
  
  #define SECBIT_NOROOT		(issecure_mask(SECURE_NOROOT))
  #define SECBIT_NOROOT_LOCKED	(issecure_mask(SECURE_NOROOT_LOCKED))
  
  /* When set, setuid to/from uid 0 does not trigger capability-"fixup".
     When unset, to provide compatiblility with old programs relying on
     set*uid to gain/lose privilege, transitions to/from uid 0 cause
     capabilities to be gained/lost. */
  #define SECURE_NO_SETUID_FIXUP		2
  #define SECURE_NO_SETUID_FIXUP_LOCKED	3  /* make bit-2 immutable */
  
  #define SECBIT_NO_SETUID_FIXUP	(issecure_mask(SECURE_NO_SETUID_FIXUP))
  #define SECBIT_NO_SETUID_FIXUP_LOCKED \
  			(issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))
  
  /* When set, a process can retain its capabilities even after
     transitioning to a non-root user (the set-uid fixup suppressed by
     bit 2). Bit-4 is cleared when a process calls exec(); setting both
     bit 4 and 5 will create a barrier through exec that no exec()'d
     child can use this feature again. */
  #define SECURE_KEEP_CAPS		4
  #define SECURE_KEEP_CAPS_LOCKED		5  /* make bit-4 immutable */
  
  #define SECBIT_KEEP_CAPS	(issecure_mask(SECURE_KEEP_CAPS))
  #define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))
  
  /* When set, a process cannot add new capabilities to its ambient set. */
  #define SECURE_NO_CAP_AMBIENT_RAISE		6
  #define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED	7  /* make bit-6 immutable */
  
  #define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))
  #define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \
  			(issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED))
  
  #define SECURE_ALL_BITS		(issecure_mask(SECURE_NOROOT) | \
  				 issecure_mask(SECURE_NO_SETUID_FIXUP) | \
  				 issecure_mask(SECURE_KEEP_CAPS) | \
  				 issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))
  #define SECURE_ALL_LOCKS	(SECURE_ALL_BITS << 1)
  
  #endif /* _UAPI_LINUX_SECUREBITS_H */
  