[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / securebits.h

#ifndef _LINUX_SECUREBITS_H
#define _LINUX_SECUREBITS_H 1

#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 inheritable bitmask of the
   executable file. */
#define SECURE_NOROOT			0
#define SECURE_NOROOT_LOCKED		1  /* make bit-0 immutable */

/* When set, setuid to/from uid 0 does not trigger capability-"fixes"
   to be compatible with old programs relying on set*uid to loose
   privileges. When unset, setuid doesn't change privileges. */
#define SECURE_NO_SETUID_FIXUP		2
#define SECURE_NO_SETUID_FIXUP_LOCKED	3  /* make bit-2 immutable */

/* 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 */

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

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

#endif /* !_LINUX_SECUREBITS_H */
Commit	Line	Data
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
3898b1b4 AM	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))
3898b1b4 AM	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
1da177e4 LT	41	#endif /* !_LINUX_SECUREBITS_H */