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1da177e4 LT |
1 | #ifndef _LINUX_SECUREBITS_H |
2 | #define _LINUX_SECUREBITS_H 1 | |
3 | ||
4 | #define SECUREBITS_DEFAULT 0x00000000 | |
5 | ||
1da177e4 LT |
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. */ | |
3898b1b4 AM |
12 | #define SECURE_NOROOT 0 |
13 | #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ | |
1da177e4 LT |
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. */ | |
3898b1b4 AM |
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 */ | |
1da177e4 LT |
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. */ | |
3898b1b4 AM |
33 | #define issecure_mask(X) (1 << (X)) |
34 | #define issecure(X) (issecure_mask(X) & current->securebits) | |
1da177e4 | 35 | |
3898b1b4 AM |
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) | |
1da177e4 LT |
40 | |
41 | #endif /* !_LINUX_SECUREBITS_H */ |