include/linux/securebits.h

   1 #ifndef _LINUX_SECUREBITS_H
   2 #define _LINUX_SECUREBITS_H 1
   3
   4 #define SECUREBITS_DEFAULT 0x00000000
   5
   6 extern unsigned securebits;
   7
   8 /* When set UID 0 has no special privileges. When unset, we support
   9    inheritance of root-permissions and suid-root executable under
  10    compatibility mode. We raise the effective and inheritable bitmasks
  11    *of the executable file* if the effective uid of the new process is
  12    0. If the real uid is 0, we raise the inheritable bitmask of the
  13    executable file. */
  14 #define SECURE_NOROOT            0
  15
  16 /* When set, setuid to/from uid 0 does not trigger capability-"fixes"
  17    to be compatible with old programs relying on set*uid to loose
  18    privileges. When unset, setuid doesn't change privileges. */
  19 #define SECURE_NO_SETUID_FIXUP   2
  20
  21 /* Each securesetting is implemented using two bits. One bit specify
  22    whether the setting is on or off. The other bit specify whether the
  23    setting is fixed or not. A setting which is fixed cannot be changed
  24    from user-level. */
  25
  26 #define issecure(X) ( (1 << (X+1)) & SECUREBITS_DEFAULT ?       \
  27                       (1 << (X)) & SECUREBITS_DEFAULT :         \
  28                       (1 << (X)) & securebits )
  29
  30 #endif /* !_LINUX_SECUREBITS_H */