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 executablew 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 */ 31