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- #ifndef _LINUX_SECUREBITS_H
- #define _LINUX_SECUREBITS_H 1
- /* Each securesetting is implemented using two bits. One bit specifies
- whether the setting is on or off. The other bit specify whether the
- setting is locked or not. A setting which is locked cannot be
- changed from user-level. */
- #define issecure_mask(X) (1 << (X))
- #ifdef __KERNEL__
- #define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits))
- #endif
- #define SECUREBITS_DEFAULT 0x00000000
- /* When set UID 0 has no special privileges. When unset, we support
- inheritance of root-permissions and suid-root executable under
- compatibility mode. We raise the effective and inheritable bitmasks
- *of the executable file* if the effective uid of the new process is
- 0. If the real uid is 0, we raise the effective (legacy) bit of the
- executable file. */
- #define SECURE_NOROOT 0
- #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */
- #define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT))
- #define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED))
- /* When set, setuid to/from uid 0 does not trigger capability-"fixup".
- When unset, to provide compatiblility with old programs relying on
- set*uid to gain/lose privilege, transitions to/from uid 0 cause
- capabilities to be gained/lost. */
- #define SECURE_NO_SETUID_FIXUP 2
- #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */
- #define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP))
- #define SECBIT_NO_SETUID_FIXUP_LOCKED \
- (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))
- /* When set, a process can retain its capabilities even after
- transitioning to a non-root user (the set-uid fixup suppressed by
- bit 2). Bit-4 is cleared when a process calls exec(); setting both
- bit 4 and 5 will create a barrier through exec that no exec()'d
- child can use this feature again. */
- #define SECURE_KEEP_CAPS 4
- #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */
- #define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS))
- #define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))
- #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
- issecure_mask(SECURE_NO_SETUID_FIXUP) | \
- issecure_mask(SECURE_KEEP_CAPS))
- #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)
- #endif /* !_LINUX_SECUREBITS_H */
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