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