1 #ifndef _LINUX_SECUREBITS_H 2 #define _LINUX_SECUREBITS_H 1 3 4 #define SECUREBITS_DEFAULT 0x00000000 5 6 /* When set UID 0 has no special privileges. When unset, we support 7 inheritance of root-permissions and suid-root executable under 8 compatibility mode. We raise the effective and inheritable bitmasks 9 *of the executable file* if the effective uid of the new process is 10 0. If the real uid is 0, we raise the inheritable bitmask of the 11 executable file. */ 12 #define SECURE_NOROOT 0 13 #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ 14 15 /* When set, setuid to/from uid 0 does not trigger capability-"fixes" 16 to be compatible with old programs relying on set*uid to loose 17 privileges. When unset, setuid doesn't change privileges. */ 18 #define SECURE_NO_SETUID_FIXUP 2 19 #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ 20 21 /* When set, a process can retain its capabilities even after 22 transitioning to a non-root user (the set-uid fixup suppressed by 23 bit 2). Bit-4 is cleared when a process calls exec(); setting both 24 bit 4 and 5 will create a barrier through exec that no exec()'d 25 child can use this feature again. */ 26 #define SECURE_KEEP_CAPS 4 27 #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ 28 29 /* Each securesetting is implemented using two bits. One bit specify 30 whether the setting is on or off. The other bit specify whether the 31 setting is fixed or not. A setting which is fixed cannot be changed 32 from user-level. */ 33 #define issecure_mask(X) (1 << (X)) 34 #define issecure(X) (issecure_mask(X) & current->securebits) 35 36 #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ 37 issecure_mask(SECURE_NO_SETUID_FIXUP) | \ 38 issecure_mask(SECURE_KEEP_CAPS)) 39 #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) 40 41 #endif /* !_LINUX_SECUREBITS_H */ 42