1*f80ad8b4SAndroid Build Coastguard Worker /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*f80ad8b4SAndroid Build Coastguard Worker #ifndef _UAPI_LINUX_SECUREBITS_H 3*f80ad8b4SAndroid Build Coastguard Worker #define _UAPI_LINUX_SECUREBITS_H 4*f80ad8b4SAndroid Build Coastguard Worker 5*f80ad8b4SAndroid Build Coastguard Worker /* Each securesetting is implemented using two bits. One bit specifies 6*f80ad8b4SAndroid Build Coastguard Worker whether the setting is on or off. The other bit specify whether the 7*f80ad8b4SAndroid Build Coastguard Worker setting is locked or not. A setting which is locked cannot be 8*f80ad8b4SAndroid Build Coastguard Worker changed from user-level. */ 9*f80ad8b4SAndroid Build Coastguard Worker #define issecure_mask(X) (1 << (X)) 10*f80ad8b4SAndroid Build Coastguard Worker 11*f80ad8b4SAndroid Build Coastguard Worker #define SECUREBITS_DEFAULT 0x00000000 12*f80ad8b4SAndroid Build Coastguard Worker 13*f80ad8b4SAndroid Build Coastguard Worker /* When set UID 0 has no special privileges. When unset, we support 14*f80ad8b4SAndroid Build Coastguard Worker inheritance of root-permissions and suid-root executable under 15*f80ad8b4SAndroid Build Coastguard Worker compatibility mode. We raise the effective and inheritable bitmasks 16*f80ad8b4SAndroid Build Coastguard Worker *of the executable file* if the effective uid of the new process is 17*f80ad8b4SAndroid Build Coastguard Worker 0. If the real uid is 0, we raise the effective (legacy) bit of the 18*f80ad8b4SAndroid Build Coastguard Worker executable file. */ 19*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_NOROOT 0 20*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ 21*f80ad8b4SAndroid Build Coastguard Worker 22*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT)) 23*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED)) 24*f80ad8b4SAndroid Build Coastguard Worker 25*f80ad8b4SAndroid Build Coastguard Worker /* When set, setuid to/from uid 0 does not trigger capability-"fixup". 26*f80ad8b4SAndroid Build Coastguard Worker When unset, to provide compatiblility with old programs relying on 27*f80ad8b4SAndroid Build Coastguard Worker set*uid to gain/lose privilege, transitions to/from uid 0 cause 28*f80ad8b4SAndroid Build Coastguard Worker capabilities to be gained/lost. */ 29*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_NO_SETUID_FIXUP 2 30*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ 31*f80ad8b4SAndroid Build Coastguard Worker 32*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP)) 33*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_NO_SETUID_FIXUP_LOCKED \ 34*f80ad8b4SAndroid Build Coastguard Worker (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED)) 35*f80ad8b4SAndroid Build Coastguard Worker 36*f80ad8b4SAndroid Build Coastguard Worker /* When set, a process can retain its capabilities even after 37*f80ad8b4SAndroid Build Coastguard Worker transitioning to a non-root user (the set-uid fixup suppressed by 38*f80ad8b4SAndroid Build Coastguard Worker bit 2). Bit-4 is cleared when a process calls exec(); setting both 39*f80ad8b4SAndroid Build Coastguard Worker bit 4 and 5 will create a barrier through exec that no exec()'d 40*f80ad8b4SAndroid Build Coastguard Worker child can use this feature again. */ 41*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_KEEP_CAPS 4 42*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ 43*f80ad8b4SAndroid Build Coastguard Worker 44*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS)) 45*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED)) 46*f80ad8b4SAndroid Build Coastguard Worker 47*f80ad8b4SAndroid Build Coastguard Worker /* When set, a process cannot add new capabilities to its ambient set. */ 48*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_NO_CAP_AMBIENT_RAISE 6 49*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED 7 /* make bit-6 immutable */ 50*f80ad8b4SAndroid Build Coastguard Worker 51*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) 52*f80ad8b4SAndroid Build Coastguard Worker #define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \ 53*f80ad8b4SAndroid Build Coastguard Worker (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED)) 54*f80ad8b4SAndroid Build Coastguard Worker 55*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ 56*f80ad8b4SAndroid Build Coastguard Worker issecure_mask(SECURE_NO_SETUID_FIXUP) | \ 57*f80ad8b4SAndroid Build Coastguard Worker issecure_mask(SECURE_KEEP_CAPS) | \ 58*f80ad8b4SAndroid Build Coastguard Worker issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) 59*f80ad8b4SAndroid Build Coastguard Worker #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) 60*f80ad8b4SAndroid Build Coastguard Worker 61*f80ad8b4SAndroid Build Coastguard Worker #endif /* _UAPI_LINUX_SECUREBITS_H */ 62