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 effective (legacy) bit 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-"fixup". 16 When unset, to provide compatiblility with old programs relying on 17 set*uid to gain/lose privilege, transitions to/from uid 0 cause 18 capabilities to be gained/lost. */ 19#define SECURE_NO_SETUID_FIXUP 2 20#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ 21 22/* When set, a process can retain its capabilities even after 23 transitioning to a non-root user (the set-uid fixup suppressed by 24 bit 2). Bit-4 is cleared when a process calls exec(); setting both 25 bit 4 and 5 will create a barrier through exec that no exec()'d 26 child can use this feature again. */ 27#define SECURE_KEEP_CAPS 4 28#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ 29 30/* Each securesetting is implemented using two bits. One bit specifies 31 whether the setting is on or off. The other bit specify whether the 32 setting is locked or not. A setting which is locked cannot be 33 changed from user-level. */ 34#define issecure_mask(X) (1 << (X)) 35#define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits)) 36 37#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ 38 issecure_mask(SECURE_NO_SETUID_FIXUP) | \ 39 issecure_mask(SECURE_KEEP_CAPS)) 40#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) 41 42#endif /* !_LINUX_SECUREBITS_H */ 43