1 #ifndef _LINUX_SECUREBITS_H
2 #define _LINUX_SECUREBITS_H 1
4 /* This is minimal version of Linux' linux/securebits.h header file,
5 * which is licensed GPL2 */
7 #define SECUREBITS_DEFAULT 0x00000000
9 /* When set UID 0 has no special privileges. When unset, we support
10 inheritance of root-permissions and suid-root executable under
11 compatibility mode. We raise the effective and inheritable bitmasks
12 *of the executable file* if the effective uid of the new process is
13 0. If the real uid is 0, we raise the effective (legacy) bit of the
15 #define SECURE_NOROOT 0
16 #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */
18 /* When set, setuid to/from uid 0 does not trigger capability-"fixup".
19 When unset, to provide compatiblility with old programs relying on
20 set*uid to gain/lose privilege, transitions to/from uid 0 cause
21 capabilities to be gained/lost. */
22 #define SECURE_NO_SETUID_FIXUP 2
23 #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */
25 /* When set, a process can retain its capabilities even after
26 transitioning to a non-root user (the set-uid fixup suppressed by
27 bit 2). Bit-4 is cleared when a process calls exec(); setting both
28 bit 4 and 5 will create a barrier through exec that no exec()'d
29 child can use this feature again. */
30 #define SECURE_KEEP_CAPS 4
31 #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */
33 /* Each securesetting is implemented using two bits. One bit specifies
34 whether the setting is on or off. The other bit specify whether the
35 setting is locked or not. A setting which is locked cannot be
36 changed from user-level. */
37 #define issecure_mask(X) (1 << (X))
38 #define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits))
40 #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
41 issecure_mask(SECURE_NO_SETUID_FIXUP) | \
42 issecure_mask(SECURE_KEEP_CAPS))
43 #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)
45 #endif /* !_LINUX_SECUREBITS_H */