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[mirror_ubuntu-bionic-kernel.git] / include / uapi / linux / securebits.h
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1#ifndef _UAPI_LINUX_SECUREBITS_H
2#define _UAPI_LINUX_SECUREBITS_H
3
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))
9
10#define SECUREBITS_DEFAULT 0x00000000
11
12/* When set UID 0 has no special privileges. When unset, we support
13 inheritance of root-permissions and suid-root executable under
14 compatibility mode. We raise the effective and inheritable bitmasks
15 *of the executable file* if the effective uid of the new process is
16 0. If the real uid is 0, we raise the effective (legacy) bit of the
17 executable file. */
18#define SECURE_NOROOT 0
19#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */
20
21#define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT))
22#define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED))
23
24/* When set, setuid to/from uid 0 does not trigger capability-"fixup".
25 When unset, to provide compatiblility with old programs relying on
26 set*uid to gain/lose privilege, transitions to/from uid 0 cause
27 capabilities to be gained/lost. */
28#define SECURE_NO_SETUID_FIXUP 2
29#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */
30
31#define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP))
32#define SECBIT_NO_SETUID_FIXUP_LOCKED \
33 (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))
34
35/* When set, a process can retain its capabilities even after
36 transitioning to a non-root user (the set-uid fixup suppressed by
37 bit 2). Bit-4 is cleared when a process calls exec(); setting both
38 bit 4 and 5 will create a barrier through exec that no exec()'d
39 child can use this feature again. */
40#define SECURE_KEEP_CAPS 4
41#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */
42
43#define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS))
44#define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))
45
46#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
47 issecure_mask(SECURE_NO_SETUID_FIXUP) | \
48 issecure_mask(SECURE_KEEP_CAPS))
49#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)
50
51#endif /* _UAPI_LINUX_SECUREBITS_H */