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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef _UAPI_LINUX_SECUREBITS_H3#define _UAPI_LINUX_SECUREBITS_H4 5/* Each securesetting is implemented using two bits. One bit specifies6 whether the setting is on or off. The other bit specify whether the7 setting is locked or not. A setting which is locked cannot be8 changed from user-level. */9#define issecure_mask(X) (1 << (X))10 11#define SECUREBITS_DEFAULT 0x0000000012 13/* When set UID 0 has no special privileges. When unset, we support14 inheritance of root-permissions and suid-root executable under15 compatibility mode. We raise the effective and inheritable bitmasks16 *of the executable file* if the effective uid of the new process is17 0. If the real uid is 0, we raise the effective (legacy) bit of the18 executable file. */19#define SECURE_NOROOT 020#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */21 22#define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT))23#define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED))24 25/* When set, setuid to/from uid 0 does not trigger capability-"fixup".26 When unset, to provide compatiblility with old programs relying on27 set*uid to gain/lose privilege, transitions to/from uid 0 cause28 capabilities to be gained/lost. */29#define SECURE_NO_SETUID_FIXUP 230#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */31 32#define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP))33#define SECBIT_NO_SETUID_FIXUP_LOCKED \34 (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))35 36/* When set, a process can retain its capabilities even after37 transitioning to a non-root user (the set-uid fixup suppressed by38 bit 2). Bit-4 is cleared when a process calls exec(); setting both39 bit 4 and 5 will create a barrier through exec that no exec()'d40 child can use this feature again. */41#define SECURE_KEEP_CAPS 442#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */43 44#define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS))45#define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))46 47/* When set, a process cannot add new capabilities to its ambient set. */48#define SECURE_NO_CAP_AMBIENT_RAISE 649#define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED 7 /* make bit-6 immutable */50 51#define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))52#define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \53 (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED))54 55#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \56 issecure_mask(SECURE_NO_SETUID_FIXUP) | \57 issecure_mask(SECURE_KEEP_CAPS) | \58 issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))59#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)60 61#endif /* _UAPI_LINUX_SECUREBITS_H */62