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1 | #ifndef _LINUX_SECUREBITS_H |
2 | #define _LINUX_SECUREBITS_H 1 | |
3 | ||
4 | /* This is minimal version of Linux' linux/securebits.h header file, | |
5 | * which is licensed GPL2 */ | |
6 | ||
7 | #define SECUREBITS_DEFAULT 0x00000000 | |
8 | ||
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 | |
14 | executable file. */ | |
15 | #define SECURE_NOROOT 0 | |
16 | #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ | |
17 | ||
18 | /* When set, setuid to/from uid 0 does not trigger capability-"fixup". | |
35b8ca3a | 19 | When unset, to provide compatibility with old programs relying on |
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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 */ | |
24 | ||
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 */ | |
32 | ||
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)) | |
39 | ||
40 | #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ | |
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41 | issecure_mask(SECURE_NO_SETUID_FIXUP) | \ |
42 | issecure_mask(SECURE_KEEP_CAPS)) | |
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43 | #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) |
44 | ||
45 | #endif /* !_LINUX_SECUREBITS_H */ |