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1#ifndef _LINUX_SECUREBITS_H
2#define _LINUX_SECUREBITS_H 1
3
4#define SECUREBITS_DEFAULT 0x00000000
5
6/* When set UID 0 has no special privileges. When unset, we support
7 inheritance of root-permissions and suid-root executable under
8 compatibility mode. We raise the effective and inheritable bitmasks
9 *of the executable file* if the effective uid of the new process is
10 0. If the real uid is 0, we raise the inheritable bitmask of the
11 executable file. */
12#define SECURE_NOROOT 0
13#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */
14
15/* When set, setuid to/from uid 0 does not trigger capability-"fixes"
16 to be compatible with old programs relying on set*uid to loose
17 privileges. When unset, setuid doesn't change privileges. */
18#define SECURE_NO_SETUID_FIXUP 2
19#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */
20
21/* When set, a process can retain its capabilities even after
22 transitioning to a non-root user (the set-uid fixup suppressed by
23 bit 2). Bit-4 is cleared when a process calls exec(); setting both
24 bit 4 and 5 will create a barrier through exec that no exec()'d
25 child can use this feature again. */
26#define SECURE_KEEP_CAPS 4
27#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */
28
29/* Each securesetting is implemented using two bits. One bit specify
30 whether the setting is on or off. The other bit specify whether the
31 setting is fixed or not. A setting which is fixed cannot be changed
32 from user-level. */
33#define issecure_mask(X) (1 << (X))
34#define issecure(X) (issecure_mask(X) & current->securebits)
35
36#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
37 issecure_mask(SECURE_NO_SETUID_FIXUP) | \
38 issecure_mask(SECURE_KEEP_CAPS))
39#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)
40
41#endif /* !_LINUX_SECUREBITS_H */