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#ifndef _LINUX_SECUREBITS_H

#define _LINUX_SECUREBITS_H

/* 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))

#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 */