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Edit File : securebits.h \| Size : 2.64 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _LINUX_SECUREBITS_H #define _LINUX_SECUREBITS_H / Each securesetting is implemented using two bits. One bit specifies whether the setting is on or off. The other bit specify whether the setting is locked or not. A setting which is locked cannot be changed from user-level. / #define issecure_mask(X) (1 << (X)) #define SECUREBITS_DEFAULT 0x00000000 / When set UID 0 has no special privileges. When unset, we support inheritance of root-permissions and suid-root executable under compatibility mode. We raise the effective and inheritable bitmasks of the executable file if the effective uid of the new process is 0. If the real uid is 0, we raise the effective (legacy) bit of the executable file. / #define SECURE_NOROOT 0 #define SECURE_NOROOT_LOCKED 1 / make bit-0 immutable / #define SECBIT_NOROOT (issecure_mask(SECURE_NOROOT)) #define SECBIT_NOROOT_LOCKED (issecure_mask(SECURE_NOROOT_LOCKED)) / When set, setuid to/from uid 0 does not trigger capability-"fixup". When unset, to provide compatiblility with old programs relying on setuid to gain/lose privilege, transitions to/from uid 0 cause capabilities to be gained/lost. / #define SECURE_NO_SETUID_FIXUP 2 #define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable / #define SECBIT_NO_SETUID_FIXUP (issecure_mask(SECURE_NO_SETUID_FIXUP)) #define SECBIT_NO_SETUID_FIXUP_LOCKED \ (issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED)) / When set, a process can retain its capabilities even after transitioning to a non-root user (the set-uid fixup suppressed by bit 2). Bit-4 is cleared when a process calls exec(); setting both bit 4 and 5 will create a barrier through exec that no exec()'d child can use this feature again. / #define SECURE_KEEP_CAPS 4 #define SECURE_KEEP_CAPS_LOCKED 5 / make bit-4 immutable / #define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS)) #define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED)) / When set, a process cannot add new capabilities to its ambient set. / #define SECURE_NO_CAP_AMBIENT_RAISE 6 #define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED 7 / make bit-6 immutable / #define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) #define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \ (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED)) #define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) \| \ issecure_mask(SECURE_NO_SETUID_FIXUP) \| \ issecure_mask(SECURE_KEEP_CAPS) \| \ issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE)) #define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) #endif / _LINUX_SECUREBITS_H */ Back

Edit File : securebits.h | Size : 2.64 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_SECUREBITS_H
#define _LINUX_SECUREBITS_H

/* Each securesetting is implemented using two bits. One bit specifies
   whether the setting is on or off. The other bit specify whether the
   setting is locked or not. A setting which is locked cannot be
   changed from user-level. */
#define issecure_mask(X)	(1 << (X))

#define SECUREBITS_DEFAULT 0x00000000

/* When set UID 0 has no special privileges. When unset, we support
   inheritance of root-permissions and suid-root executable under
   compatibility mode. We raise the effective and inheritable bitmasks
   *of the executable file* if the effective uid of the new process is
   0. If the real uid is 0, we raise the effective (legacy) bit of the
   executable file. */
#define SECURE_NOROOT			0
#define SECURE_NOROOT_LOCKED		1  /* make bit-0 immutable */

#define SECBIT_NOROOT		(issecure_mask(SECURE_NOROOT))
#define SECBIT_NOROOT_LOCKED	(issecure_mask(SECURE_NOROOT_LOCKED))

/* When set, setuid to/from uid 0 does not trigger capability-"fixup".
   When unset, to provide compatiblility with old programs relying on
   set*uid to gain/lose privilege, transitions to/from uid 0 cause
   capabilities to be gained/lost. */
#define SECURE_NO_SETUID_FIXUP		2
#define SECURE_NO_SETUID_FIXUP_LOCKED	3  /* make bit-2 immutable */

#define SECBIT_NO_SETUID_FIXUP	(issecure_mask(SECURE_NO_SETUID_FIXUP))
#define SECBIT_NO_SETUID_FIXUP_LOCKED \
			(issecure_mask(SECURE_NO_SETUID_FIXUP_LOCKED))

/* When set, a process can retain its capabilities even after
   transitioning to a non-root user (the set-uid fixup suppressed by
   bit 2). Bit-4 is cleared when a process calls exec(); setting both
   bit 4 and 5 will create a barrier through exec that no exec()'d
   child can use this feature again. */
#define SECURE_KEEP_CAPS		4
#define SECURE_KEEP_CAPS_LOCKED		5  /* make bit-4 immutable */

#define SECBIT_KEEP_CAPS	(issecure_mask(SECURE_KEEP_CAPS))
#define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))

/* When set, a process cannot add new capabilities to its ambient set. */
#define SECURE_NO_CAP_AMBIENT_RAISE		6
#define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED	7  /* make bit-6 immutable */

#define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))
#define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \
			(issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED))

#define SECURE_ALL_BITS		(issecure_mask(SECURE_NOROOT) | \
				 issecure_mask(SECURE_NO_SETUID_FIXUP) | \
				 issecure_mask(SECURE_KEEP_CAPS) | \
				 issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))
#define SECURE_ALL_LOCKS	(SECURE_ALL_BITS << 1)

#endif /* _LINUX_SECUREBITS_H */

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