| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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| 2 | #ifndef _UAPI_LINUX_SECUREBITS_H |
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| 3 | #define _UAPI_LINUX_SECUREBITS_H |
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| 4 | |
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| 5 | /* Each securesetting is implemented using two bits. One bit specifies |
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| 6 | whether the setting is on or off. The other bit specify whether the |
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| 7 | setting is locked or not. A setting which is locked cannot be |
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| 8 | changed from user-level. */ |
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| 9 | #define issecure_mask(X) (1 << (X)) |
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| 10 | |
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| 11 | #define SECUREBITS_DEFAULT 0x00000000 |
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| 12 | |
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| 13 | /* When set UID 0 has no special privileges. When unset, we support |
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| 14 | inheritance of root-permissions and suid-root executable under |
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| 15 | compatibility mode. We raise the effective and inheritable bitmasks |
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| 16 | *of the executable file* if the effective uid of the new process is |
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| 17 | 0. If the real uid is 0, we raise the effective (legacy) bit of the |
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| 18 | executable file. */ |
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| 19 | #define SECURE_NOROOT 0 |
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| 20 | #define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ |
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| 21 | |
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| 22 | #define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT)) |
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| 23 | #define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED)) |
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| 24 | |
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| 25 | /* When set, setuid to/from uid 0 does not trigger capability-"fixup". |
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| 26 | When unset, to provide compatiblility with old programs relying on |
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| 27 | set*uid to gain/lose privilege, transitions to/from uid 0 cause |
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| 28 | capabilities to be gained/lost. */ |
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| 29 | #define SECURE_NO_SETUID_FIXUP 2 |
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| 30 | #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ |
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| 31 | |
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| 32 | #define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP)) |
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| 33 | #define SECBIT_NO_SETUID_FIXUP_LOCKED \ |
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| 34 | (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED)) |
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| 35 | |
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| 36 | /* When set, a process can retain its capabilities even after |
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| 37 | transitioning to a non-root user (the set-uid fixup suppressed by |
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| 38 | bit 2). Bit-4 is cleared when a process calls exec(); setting both |
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| 39 | bit 4 and 5 will create a barrier through exec that no exec()'d |
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| 40 | child can use this feature again. */ |
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| 41 | #define SECURE_KEEP_CAPS 4 |
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| 42 | #define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ |
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| 43 | |
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| 44 | #define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS)) |
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| 45 | #define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED)) |
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| 46 | |
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| 47 | /* When set, a process cannot add new capabilities to its ambient set. */ |
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| 48 | #define SECURE_NO_CAP_AMBIENT_RAISE 6 |
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| 49 | #define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED 7 /* make bit-6 immutable */ |
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| 50 | |
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| 51 | #define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) |
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| 52 | #define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \ |
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| 53 | (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED)) |
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| 54 | |
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| 55 | #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ |
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| 56 | issecure_mask(SECURE_NO_SETUID_FIXUP) | \ |
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| 57 | issecure_mask(SECURE_KEEP_CAPS) | \ |
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| 58 | issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) |
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| 59 | #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) |
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| 60 | |
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| 61 | #endif /* _UAPI_LINUX_SECUREBITS_H */ |
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| 62 | |
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