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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 | |
086f7316 | 10 | 0. If the real uid is 0, we raise the effective (legacy) bit of the |
1da177e4 | 11 | executable file. */ |
3898b1b4 AM |
12 | #define SECURE_NOROOT 0 |
13 | #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ | |
1da177e4 | 14 | |
086f7316 AM |
15 | /* When set, setuid to/from uid 0 does not trigger capability-"fixup". |
16 | When unset, to provide compatiblility with old programs relying on | |
17 | set*uid to gain/lose privilege, transitions to/from uid 0 cause | |
18 | capabilities to be gained/lost. */ | |
3898b1b4 AM |
19 | #define SECURE_NO_SETUID_FIXUP 2 |
20 | #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ | |
21 | ||
22 | /* When set, a process can retain its capabilities even after | |
23 | transitioning to a non-root user (the set-uid fixup suppressed by | |
24 | bit 2). Bit-4 is cleared when a process calls exec(); setting both | |
25 | bit 4 and 5 will create a barrier through exec that no exec()'d | |
26 | child can use this feature again. */ | |
27 | #define SECURE_KEEP_CAPS 4 | |
28 | #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ | |
1da177e4 | 29 | |
086f7316 | 30 | /* Each securesetting is implemented using two bits. One bit specifies |
1da177e4 | 31 | whether the setting is on or off. The other bit specify whether the |
086f7316 AM |
32 | setting is locked or not. A setting which is locked cannot be |
33 | changed from user-level. */ | |
3898b1b4 | 34 | #define issecure_mask(X) (1 << (X)) |
86a264ab | 35 | #define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits)) |
1da177e4 | 36 | |
3898b1b4 AM |
37 | #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ |
38 | issecure_mask(SECURE_NO_SETUID_FIXUP) | \ | |
39 | issecure_mask(SECURE_KEEP_CAPS)) | |
40 | #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) | |
1da177e4 LT |
41 | |
42 | #endif /* !_LINUX_SECUREBITS_H */ |