/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _LINUX_SECUREBITS_H

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#define _LINUX_SECUREBITS_H

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/* Each securesetting is implemented using two bits. One bit specifies

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whether the setting is on or off. The other bit specify whether the

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setting is locked or not. A setting which is locked cannot be

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changed from user-level. */

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#define issecure_mask(X) (1 << (X))

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#define SECUREBITS_DEFAULT 0x00000000

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/* When set UID 0 has no special privileges. When unset, we support

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inheritance of root-permissions and suid-root executable under

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compatibility mode. We raise the effective and inheritable bitmasks

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*of the executable file* if the effective uid of the new process is

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0. If the real uid is 0, we raise the effective (legacy) bit of the

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executable file. */

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#define SECURE_NOROOT 0

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#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */

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#define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT))

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#define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED))

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/* When set, setuid to/from uid 0 does not trigger capability-"fixup".

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When unset, to provide compatiblility with old programs relying on

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set*uid to gain/lose privilege, transitions to/from uid 0 cause

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capabilities to be gained/lost. */

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#define SECURE_NO_SETUID_FIXUP 2

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#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */

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#define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP))

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#define SECBIT_NO_SETUID_FIXUP_LOCKED \

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(issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))

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/* When set, a process can retain its capabilities even after

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transitioning to a non-root user (the set-uid fixup suppressed by

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bit 2). Bit-4 is cleared when a process calls exec(); setting both

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bit 4 and 5 will create a barrier through exec that no exec()'d

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child can use this feature again. */

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#define SECURE_KEEP_CAPS 4

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#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */

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#define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS))

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#define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))

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/* When set, a process cannot add new capabilities to its ambient set. */

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#define SECURE_NO_CAP_AMBIENT_RAISE 6

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#define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED 7 /* make bit-6 immutable */

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#define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))

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#define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \

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(issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED))

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#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \

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issecure_mask(SECURE_NO_SETUID_FIXUP) | \

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issecure_mask(SECURE_KEEP_CAPS) | \

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issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))

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#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)

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#endif /* _LINUX_SECUREBITS_H */

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