1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4882a593Smuzhiyun #ifndef _UAPI_LINUX_SECUREBITS_H 3*4882a593Smuzhiyun #define _UAPI_LINUX_SECUREBITS_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun /* Each securesetting is implemented using two bits. One bit specifies 6*4882a593Smuzhiyun whether the setting is on or off. The other bit specify whether the 7*4882a593Smuzhiyun setting is locked or not. A setting which is locked cannot be 8*4882a593Smuzhiyun changed from user-level. */ 9*4882a593Smuzhiyun #define issecure_mask(X) (1 << (X)) 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #define SECUREBITS_DEFAULT 0x00000000 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun /* When set UID 0 has no special privileges. When unset, we support 14*4882a593Smuzhiyun inheritance of root-permissions and suid-root executable under 15*4882a593Smuzhiyun compatibility mode. We raise the effective and inheritable bitmasks 16*4882a593Smuzhiyun *of the executable file* if the effective uid of the new process is 17*4882a593Smuzhiyun 0. If the real uid is 0, we raise the effective (legacy) bit of the 18*4882a593Smuzhiyun executable file. */ 19*4882a593Smuzhiyun #define SECURE_NOROOT 0 20*4882a593Smuzhiyun #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT)) 23*4882a593Smuzhiyun #define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED)) 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /* When set, setuid to/from uid 0 does not trigger capability-"fixup". 26*4882a593Smuzhiyun When unset, to provide compatiblility with old programs relying on 27*4882a593Smuzhiyun set*uid to gain/lose privilege, transitions to/from uid 0 cause 28*4882a593Smuzhiyun capabilities to be gained/lost. */ 29*4882a593Smuzhiyun #define SECURE_NO_SETUID_FIXUP 2 30*4882a593Smuzhiyun #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun #define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP)) 33*4882a593Smuzhiyun #define SECBIT_NO_SETUID_FIXUP_LOCKED \ 34*4882a593Smuzhiyun (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED)) 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun /* When set, a process can retain its capabilities even after 37*4882a593Smuzhiyun transitioning to a non-root user (the set-uid fixup suppressed by 38*4882a593Smuzhiyun bit 2). Bit-4 is cleared when a process calls exec(); setting both 39*4882a593Smuzhiyun bit 4 and 5 will create a barrier through exec that no exec()'d 40*4882a593Smuzhiyun child can use this feature again. */ 41*4882a593Smuzhiyun #define SECURE_KEEP_CAPS 4 42*4882a593Smuzhiyun #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun #define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS)) 45*4882a593Smuzhiyun #define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED)) 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun /* When set, a process cannot add new capabilities to its ambient set. */ 48*4882a593Smuzhiyun #define SECURE_NO_CAP_AMBIENT_RAISE 6 49*4882a593Smuzhiyun #define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED 7 /* make bit-6 immutable */ 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun #define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) 52*4882a593Smuzhiyun #define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \ 53*4882a593Smuzhiyun (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED)) 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ 56*4882a593Smuzhiyun issecure_mask(SECURE_NO_SETUID_FIXUP) | \ 57*4882a593Smuzhiyun issecure_mask(SECURE_KEEP_CAPS) | \ 58*4882a593Smuzhiyun issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) 59*4882a593Smuzhiyun #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun #endif /* _UAPI_LINUX_SECUREBITS_H */ 62