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

/*
 * This is <linux/capability.h>
 *
 * Andrew G. Morgan <morgan@kernel.org>
 * Alexander Kjeldaas <astor@guardian.no>
 * with help from Aleph1, Roland Buresund and Andrew Main.
 *
 * See here for the libcap library ("POSIX draft" compliance):
 *
 * ftp://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
 */

#ifndef _LINUX_CAPABILITY_H
#define _LINUX_CAPABILITY_H

#include <linux/types.h>

struct task_struct;

/* User-level do most of the mapping between kernel and user
   capabilities based on the version tag given by the kernel. The
   kernel might be somewhat backwards compatible, but don't bet on
   it. */

/* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
   a set of three capability sets.  The transposition of 3*the
   following structure to such a composite is better handled in a user
   library since the draft standard requires the use of malloc/free
   etc.. */

#define _LINUX_CAPABILITY_VERSION_1  0x19980330
#define _LINUX_CAPABILITY_U32S_1     1

#define _LINUX_CAPABILITY_VERSION_2  0x20071026  /* deprecated - use v3 */
#define _LINUX_CAPABILITY_U32S_2     2

#define _LINUX_CAPABILITY_VERSION_3  0x20080522
#define _LINUX_CAPABILITY_U32S_3     2

typedef struct __user_cap_header_struct {
	__u32 version;
	int pid;
} __user *cap_user_header_t;

typedef struct __user_cap_data_struct {
        __u32 effective;
        __u32 permitted;
        __u32 inheritable;
} __user *cap_user_data_t;


#define VFS_CAP_REVISION_MASK	0xFF000000
#define VFS_CAP_REVISION_SHIFT	24
#define VFS_CAP_FLAGS_MASK	~VFS_CAP_REVISION_MASK
#define VFS_CAP_FLAGS_EFFECTIVE	0x000001

#define VFS_CAP_REVISION_1	0x01000000
#define VFS_CAP_U32_1           1
#define XATTR_CAPS_SZ_1         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))

#define VFS_CAP_REVISION_2	0x02000000
#define VFS_CAP_U32_2           2
#define XATTR_CAPS_SZ_2         (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))

#define XATTR_CAPS_SZ           XATTR_CAPS_SZ_2
#define VFS_CAP_U32             VFS_CAP_U32_2
#define VFS_CAP_REVISION	VFS_CAP_REVISION_2

struct vfs_cap_data {
	__le32 magic_etc;            /* Little endian */
	struct {
		__le32 permitted;    /* Little endian */
		__le32 inheritable;  /* Little endian */
	} data[VFS_CAP_U32];
};

#ifndef __KERNEL__

/*
 * Backwardly compatible definition for source code - trapped in a
 * 32-bit world. If you find you need this, please consider using
 * libcap to untrap yourself...
 */
#define _LINUX_CAPABILITY_VERSION  _LINUX_CAPABILITY_VERSION_1
#define _LINUX_CAPABILITY_U32S     _LINUX_CAPABILITY_U32S_1

#else

#define _KERNEL_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_3
#define _KERNEL_CAPABILITY_U32S    _LINUX_CAPABILITY_U32S_3

extern int file_caps_enabled;

typedef struct kernel_cap_struct {
	__u32 cap[_KERNEL_CAPABILITY_U32S];
} kernel_cap_t;

/* exact same as vfs_cap_data but in cpu endian and always filled completely */
struct cpu_vfs_cap_data {
	__u32 magic_etc;
	kernel_cap_t permitted;
	kernel_cap_t inheritable;
};

#define _USER_CAP_HEADER_SIZE  (sizeof(struct __user_cap_header_struct))
#define _KERNEL_CAP_T_SIZE     (sizeof(kernel_cap_t))

#endif


/**
 ** POSIX-draft defined capabilities.
 **/

/* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
   overrides the restriction of changing file ownership and group
   ownership. */

#define CAP_CHOWN            0

/* Override all DAC access, including ACL execute access if
   [_POSIX_ACL] is defined. Excluding DAC access covered by
   CAP_LINUX_IMMUTABLE. */

#define CAP_DAC_OVERRIDE     1

/* Overrides all DAC restrictions regarding read and search on files
   and directories, including ACL restrictions if [_POSIX_ACL] is
   defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */

#define CAP_DAC_READ_SEARCH  2

/* Overrides all restrictions about allowed operations on files, where
   file owner ID must be equal to the user ID, except where CAP_FSETID
   is applicable. It doesn't override MAC and DAC restrictions. */

#define CAP_FOWNER           3

/* Overrides the following restrictions that the effective user ID
   shall match the file owner ID when setting the S_ISUID and S_ISGID
   bits on that file; that the effective group ID (or one of the
   supplementary group IDs) shall match the file owner ID when setting
   the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
   cleared on successful return from chown(2) (not implemented). */

#define CAP_FSETID           4

/* Overrides the restriction that the real or effective user ID of a
   process sending a signal must match the real or effective user ID
   of the process receiving the signal. */

#define CAP_KILL             5

/* Allows setgid(2) manipulation */
/* Allows setgroups(2) */
/* Allows forged gids on socket credentials passing. */

#define CAP_SETGID           6

/* Allows set*uid(2) manipulation (including fsuid). */
/* Allows forged pids on socket credentials passing. */

#define CAP_SETUID           7


/**
 ** Linux-specific capabilities
 **/

/* Without VFS support for capabilities:
 *   Transfer any capability in your permitted set to any pid,
 *   remove any capability in your permitted set from any pid
 * With VFS support for capabilities (neither of above, but)
 *   Add any capability from current's capability bounding set
 *       to the current process' inheritable set
 *   Allow taking bits out of capability bounding set
 *   Allow modification of the securebits for a process
 */

#define CAP_SETPCAP          8

/* Allow modification of S_IMMUTABLE and S_APPEND file attributes */

#define CAP_LINUX_IMMUTABLE  9

/* Allows binding to TCP/UDP sockets below 1024 */
/* Allows binding to ATM VCIs below 32 */

#define CAP_NET_BIND_SERVICE 10

/* Allow broadcasting, listen to multicast */

#define CAP_NET_BROADCAST    11

/* Allow interface configuration */
/* Allow administration of IP firewall, masquerading and accounting */
/* Allow setting debug option on sockets */
/* Allow modification of routing tables */
/* Allow setting arbitrary process / process group ownership on
   sockets */
/* Allow binding to any address for transparent proxying */
/* Allow setting TOS (type of service) */
/* Allow setting promiscuous mode */
/* Allow clearing driver statistics */
/* Allow multicasting */
/* Allow read/write of device-specific registers */
/* Allow activation of ATM control sockets */

#define CAP_NET_ADMIN        12

/* Allow use of RAW sockets */
/* Allow use of PACKET sockets */

#define CAP_NET_RAW          13

/* Allow locking of shared memory segments */
/* Allow mlock and mlockall (which doesn't really have anything to do
   with IPC) */

#define CAP_IPC_LOCK         14

/* Override IPC ownership checks */

#define CAP_IPC_OWNER        15

/* Insert and remove kernel modules - modify kernel without limit */
#define CAP_SYS_MODULE       16

/* Allow ioperm/iopl access */
/* Allow sending USB messages to any device via /proc/bus/usb */

#define CAP_SYS_RAWIO        17

/* Allow use of chroot() */

#define CAP_SYS_CHROOT       18

/* Allow ptrace() of any process */

#define CAP_SYS_PTRACE       19

/* Allow configuration of process accounting */

#define CAP_SYS_PACCT        20

/* Allow configuration of the secure attention key */
/* Allow administration of the random device */
/* Allow examination and configuration of disk quotas */
/* Allow setting the domainname */
/* Allow setting the hostname */
/* Allow calling bdflush() */
/* Allow mount() and umount(), setting up new smb connection */
/* Allow some autofs root ioctls */
/* Allow nfsservctl */
/* Allow VM86_REQUEST_IRQ */
/* Allow to read/write pci config on alpha */
/* Allow irix_prctl on mips (setstacksize) */
/* Allow flushing all cache on m68k (sys_cacheflush) */
/* Allow removing semaphores */
/* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
   and shared memory */
/* Allow locking/unlocking of shared memory segment */
/* Allow turning swap on/off */
/* Allow forged pids on socket credentials passing */
/* Allow setting readahead and flushing buffers on block devices */
/* Allow setting geometry in floppy driver */
/* Allow turning DMA on/off in xd driver */
/* Allow administration of md devices (mostly the above, but some
   extra ioctls) */
/* Allow tuning the ide driver */
/* Allow access to the nvram device */
/* Allow administration of apm_bios, serial and bttv (TV) device */
/* Allow manufacturer commands in isdn CAPI support driver */
/* Allow reading non-standardized portions of pci configuration space */
/* Allow DDI debug ioctl on sbpcd driver */
/* Allow setting up serial ports */
/* Allow sending raw qic-117 commands */
/* Allow enabling/disabling tagged queuing on SCSI controllers and sending
   arbitrary SCSI commands */
/* Allow setting encryption key on loopback filesystem */
/* Allow setting zone reclaim policy */

#define CAP_SYS_ADMIN        21

/* Allow use of reboot() */

#define CAP_SYS_BOOT         22

/* Allow raising priority and setting priority on other (different
   UID) processes */
/* Allow use of FIFO and round-robin (realtime) scheduling on own
   processes and setting the scheduling algorithm used by another
   process. */
/* Allow setting cpu affinity on other processes */

#define CAP_SYS_NICE         23

/* Override resource limits. Set resource limits. */
/* Override quota limits. */
/* Override reserved space on ext2 filesystem */
/* Modify data journaling mode on ext3 filesystem (uses journaling
   resources) */
/* NOTE: ext2 honors fsuid when checking for resource overrides, so
   you can override using fsuid too */
/* Override size restrictions on IPC message queues */
/* Allow more than 64hz interrupts from the real-time clock */
/* Override max number of consoles on console allocation */
/* Override max number of keymaps */

#define CAP_SYS_RESOURCE     24

/* Allow manipulation of system clock */
/* Allow irix_stime on mips */
/* Allow setting the real-time clock */

#define CAP_SYS_TIME         25

/* Allow configuration of tty devices */
/* Allow vhangup() of tty */

#define CAP_SYS_TTY_CONFIG   26

/* Allow the privileged aspects of mknod() */

#define CAP_MKNOD            27

/* Allow taking of leases on files */

#define CAP_LEASE            28

#define CAP_AUDIT_WRITE      29

#define CAP_AUDIT_CONTROL    30

#define CAP_SETFCAP	     31

/* Override MAC access.
   The base kernel enforces no MAC policy.
   An LSM may enforce a MAC policy, and if it does and it chooses
   to implement capability based overrides of that policy, this is
   the capability it should use to do so. */

#define CAP_MAC_OVERRIDE     32

/* Allow MAC configuration or state changes.
   The base kernel requires no MAC configuration.
   An LSM may enforce a MAC policy, and if it does and it chooses
   to implement capability based checks on modifications to that
   policy or the data required to maintain it, this is the
   capability it should use to do so. */

#define CAP_MAC_ADMIN        33

/* Allow configuring the kernel's syslog (printk behaviour) */

#define CAP_SYSLOG           34

/* Allow triggering something that will wake the system */

#define CAP_WAKE_ALARM            35


#define CAP_LAST_CAP         CAP_WAKE_ALARM

#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)

/*
 * Bit location of each capability (used by user-space library and kernel)
 */

#define CAP_TO_INDEX(x)     ((x) >> 5)        /* 1 << 5 == bits in __u32 */
#define CAP_TO_MASK(x)      (1 << ((x) & 31)) /* mask for indexed __u32 */

#ifdef __KERNEL__

struct dentry;
struct user_namespace;

struct user_namespace *current_user_ns(void);

extern const kernel_cap_t __cap_empty_set;
extern const kernel_cap_t __cap_init_eff_set;

/*
 * Internal kernel functions only
 */

#define CAP_FOR_EACH_U32(__capi)  \
	for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi)

/*
 * CAP_FS_MASK and CAP_NFSD_MASKS:
 *
 * The fs mask is all the privileges that fsuid==0 historically meant.
 * At one time in the past, that included CAP_MKNOD and CAP_LINUX_IMMUTABLE.
 *
 * It has never meant setting security.* and trusted.* xattrs.
 *
 * We could also define fsmask as follows:
 *   1. CAP_FS_MASK is the privilege to bypass all fs-related DAC permissions
 *   2. The security.* and trusted.* xattrs are fs-related MAC permissions
 */

# define CAP_FS_MASK_B0     (CAP_TO_MASK(CAP_CHOWN)		\
			    | CAP_TO_MASK(CAP_MKNOD)		\
			    | CAP_TO_MASK(CAP_DAC_OVERRIDE)	\
			    | CAP_TO_MASK(CAP_DAC_READ_SEARCH)	\
			    | CAP_TO_MASK(CAP_FOWNER)		\
			    | CAP_TO_MASK(CAP_FSETID))

# define CAP_FS_MASK_B1     (CAP_TO_MASK(CAP_MAC_OVERRIDE))

#if _KERNEL_CAPABILITY_U32S != 2
# error Fix up hand-coded capability macro initializers
#else /* HAND-CODED capability initializers */

# define CAP_EMPTY_SET    ((kernel_cap_t){{ 0, 0 }})
# define CAP_FULL_SET     ((kernel_cap_t){{ ~0, ~0 }})
# define CAP_FS_SET       ((kernel_cap_t){{ CAP_FS_MASK_B0 \
				    | CAP_TO_MASK(CAP_LINUX_IMMUTABLE), \
				    CAP_FS_MASK_B1 } })
# define CAP_NFSD_SET     ((kernel_cap_t){{ CAP_FS_MASK_B0 \
				    | CAP_TO_MASK(CAP_SYS_RESOURCE), \
				    CAP_FS_MASK_B1 } })

#endif /* _KERNEL_CAPABILITY_U32S != 2 */

# define cap_clear(c)         do { (c) = __cap_empty_set; } while (0)

#define cap_raise(c, flag)  ((c).cap[CAP_TO_INDEX(flag)] |= CAP_TO_MASK(flag))
#define cap_lower(c, flag)  ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))
#define cap_raised(c, flag) ((c).cap[CAP_TO_INDEX(flag)] & CAP_TO_MASK(flag))

#define CAP_BOP_ALL(c, a, b, OP)                                    \
do {                                                                \
	unsigned __capi;                                            \
	CAP_FOR_EACH_U32(__capi) {                                  \
		c.cap[__capi] = a.cap[__capi] OP b.cap[__capi];     \
	}                                                           \
} while (0)

#define CAP_UOP_ALL(c, a, OP)                                       \
do {                                                                \
	unsigned __capi;                                            \
	CAP_FOR_EACH_U32(__capi) {                                  \
		c.cap[__capi] = OP a.cap[__capi];                   \
	}                                                           \
} while (0)

static inline kernel_cap_t cap_combine(const kernel_cap_t a,
				       const kernel_cap_t b)
{
	kernel_cap_t dest;
	CAP_BOP_ALL(dest, a, b, |);
	return dest;
}

static inline kernel_cap_t cap_intersect(const kernel_cap_t a,
					 const kernel_cap_t b)
{
	kernel_cap_t dest;
	CAP_BOP_ALL(dest, a, b, &);
	return dest;
}

static inline kernel_cap_t cap_drop(const kernel_cap_t a,
				    const kernel_cap_t drop)
{
	kernel_cap_t dest;
	CAP_BOP_ALL(dest, a, drop, &~);
	return dest;
}

static inline kernel_cap_t cap_invert(const kernel_cap_t c)
{
	kernel_cap_t dest;
	CAP_UOP_ALL(dest, c, ~);
	return dest;
}

static inline int cap_isclear(const kernel_cap_t a)
{
	unsigned __capi;
	CAP_FOR_EACH_U32(__capi) {
		if (a.cap[__capi] != 0)
			return 0;
	}
	return 1;
}

/*
 * Check if "a" is a subset of "set".
 * return 1 if ALL of the capabilities in "a" are also in "set"
 *	cap_issubset(0101, 1111) will return 1
 * return 0 if ANY of the capabilities in "a" are not in "set"
 *	cap_issubset(1111, 0101) will return 0
 */
static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
{
	kernel_cap_t dest;
	dest = cap_drop(a, set);
	return cap_isclear(dest);
}

/* Used to decide between falling back on the old suser() or fsuser(). */

static inline int cap_is_fs_cap(int cap)
{
	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	return !!(CAP_TO_MASK(cap) & __cap_fs_set.cap[CAP_TO_INDEX(cap)]);
}

static inline kernel_cap_t cap_drop_fs_set(const kernel_cap_t a)
{
	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	return cap_drop(a, __cap_fs_set);
}

static inline kernel_cap_t cap_raise_fs_set(const kernel_cap_t a,
					    const kernel_cap_t permitted)
{
	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	return cap_combine(a,
			   cap_intersect(permitted, __cap_fs_set));
}

static inline kernel_cap_t cap_drop_nfsd_set(const kernel_cap_t a)
{
	const kernel_cap_t __cap_fs_set = CAP_NFSD_SET;
	return cap_drop(a, __cap_fs_set);
}

static inline kernel_cap_t cap_raise_nfsd_set(const kernel_cap_t a,
					      const kernel_cap_t permitted)
{
	const kernel_cap_t __cap_nfsd_set = CAP_NFSD_SET;
	return cap_combine(a,
			   cap_intersect(permitted, __cap_nfsd_set));
}

extern bool has_capability(struct task_struct *t, int cap);
extern bool has_ns_capability(struct task_struct *t,
			      struct user_namespace *ns, int cap);
extern bool has_capability_noaudit(struct task_struct *t, int cap);
extern bool has_ns_capability_noaudit(struct task_struct *t,
				      struct user_namespace *ns, int cap);
extern bool capable(int cap);
extern bool ns_capable(struct user_namespace *ns, int cap);
extern bool nsown_capable(int cap);

/* audit system wants to get cap info from files as well */
extern int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps);

#endif /* __KERNEL__ */

#endif /* !_LINUX_CAPABILITY_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This is <linux/capability.h>
	3	*
b5376771	4	* Andrew G. Morgan <morgan@kernel.org>
1da177e4 LT	5	* Alexander Kjeldaas <astor@guardian.no>
	6	* with help from Aleph1, Roland Buresund and Andrew Main.
	7	*
	8	* See here for the libcap library ("POSIX draft" compliance):
	9	*
bcf56442	10	* ftp://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
b5376771	11	*/
1da177e4 LT	12
	13	#ifndef _LINUX_CAPABILITY_H
	14	#define _LINUX_CAPABILITY_H
	15
	16	#include <linux/types.h>
1da177e4	17
b7add02d AM	18	struct task_struct;
b7add02d AM	19
1da177e4 LT	20	/* User-level do most of the mapping between kernel and user
	21	capabilities based on the version tag given by the kernel. The
	22	kernel might be somewhat backwards compatible, but don't bet on
	23	it. */
	24
e338d263	25	/* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to
1da177e4 LT	26	a set of three capability sets. The transposition of 3*the
	27	following structure to such a composite is better handled in a user
	28	library since the draft standard requires the use of malloc/free
	29	etc.. */
b5376771	30
e338d263 AM	31	#define _LINUX_CAPABILITY_VERSION_1 0x19980330
	32	#define _LINUX_CAPABILITY_U32S_1 1
	33
ca05a99a	34	#define _LINUX_CAPABILITY_VERSION_2 0x20071026 /* deprecated - use v3 */
e338d263 AM	35	#define _LINUX_CAPABILITY_U32S_2 2
e338d263 AM	36
ca05a99a AM	37	#define _LINUX_CAPABILITY_VERSION_3 0x20080522
ca05a99a AM	38	#define _LINUX_CAPABILITY_U32S_3 2
1da177e4 LT	39
	40	typedef struct __user_cap_header_struct {
	41	__u32 version;
	42	int pid;
	43	} __user *cap_user_header_t;
b5376771	44
1da177e4 LT	45	typedef struct __user_cap_data_struct {
	46	__u32 effective;
	47	__u32 permitted;
	48	__u32 inheritable;
	49	} __user *cap_user_data_t;
1da177e4	50
e338d263	51
b5376771	52	#define VFS_CAP_REVISION_MASK 0xFF000000
851f7ff5	53	#define VFS_CAP_REVISION_SHIFT 24
e338d263 AM	54	#define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
	55	#define VFS_CAP_FLAGS_EFFECTIVE 0x000001
	56
b5376771	57	#define VFS_CAP_REVISION_1 0x01000000
e338d263 AM	58	#define VFS_CAP_U32_1 1
e338d263 AM	59	#define XATTR_CAPS_SZ_1 (sizeof(__le32)(1 + 2VFS_CAP_U32_1))
b5376771	60
e338d263 AM	61	#define VFS_CAP_REVISION_2 0x02000000
	62	#define VFS_CAP_U32_2 2
	63	#define XATTR_CAPS_SZ_2 (sizeof(__le32)(1 + 2VFS_CAP_U32_2))
	64
	65	#define XATTR_CAPS_SZ XATTR_CAPS_SZ_2
	66	#define VFS_CAP_U32 VFS_CAP_U32_2
	67	#define VFS_CAP_REVISION VFS_CAP_REVISION_2
b5376771	68
b5376771	69	struct vfs_cap_data {
e338d263	70	__le32 magic_etc; /* Little endian */
8f6936f4	71	struct {
e338d263 AM	72	__le32 permitted; /* Little endian */
	73	__le32 inheritable; /* Little endian */
	74	} data[VFS_CAP_U32];
b5376771 SH	75	};
b5376771 SH	76
ca05a99a AM	77	#ifndef __KERNEL__
	78
	79	/*
	80	* Backwardly compatible definition for source code - trapped in a
	81	* 32-bit world. If you find you need this, please consider using
	82	* libcap to untrap yourself...
	83	*/
	84	#define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1
	85	#define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1
	86
	87	#else
	88
	89	#define _KERNEL_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_3
	90	#define _KERNEL_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_3
1da177e4	91
9fa91d99	92	extern int file_caps_enabled;
9fa91d99	93
1da177e4	94	typedef struct kernel_cap_struct {
ca05a99a	95	__u32 cap[_KERNEL_CAPABILITY_U32S];
1da177e4 LT	96	} kernel_cap_t;
1da177e4 LT	97
c0b00441 EP	98	/* exact same as vfs_cap_data but in cpu endian and always filled completely */
	99	struct cpu_vfs_cap_data {
	100	__u32 magic_etc;
	101	kernel_cap_t permitted;
	102	kernel_cap_t inheritable;
	103	};
	104
e338d263	105	#define _USER_CAP_HEADER_SIZE (sizeof(struct __user_cap_header_struct))
1da177e4 LT	106	#define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
	107
	108	#endif
	109
	110
	111	/**
b5376771	112	** POSIX-draft defined capabilities.
1da177e4 LT	113	**/
	114
	115	/* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
	116	overrides the restriction of changing file ownership and group
	117	ownership. */
	118
	119	#define CAP_CHOWN 0
	120
	121	/* Override all DAC access, including ACL execute access if
	122	[_POSIX_ACL] is defined. Excluding DAC access covered by
	123	CAP_LINUX_IMMUTABLE. */
	124
	125	#define CAP_DAC_OVERRIDE 1
	126
	127	/* Overrides all DAC restrictions regarding read and search on files
	128	and directories, including ACL restrictions if [_POSIX_ACL] is
	129	defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
	130
	131	#define CAP_DAC_READ_SEARCH 2
b5376771	132
1da177e4 LT	133	/* Overrides all restrictions about allowed operations on files, where
	134	file owner ID must be equal to the user ID, except where CAP_FSETID
	135	is applicable. It doesn't override MAC and DAC restrictions. */
	136
	137	#define CAP_FOWNER 3
	138
	139	/* Overrides the following restrictions that the effective user ID
	140	shall match the file owner ID when setting the S_ISUID and S_ISGID
	141	bits on that file; that the effective group ID (or one of the
	142	supplementary group IDs) shall match the file owner ID when setting
	143	the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
	144	cleared on successful return from chown(2) (not implemented). */
	145
	146	#define CAP_FSETID 4
	147
1da177e4 LT	148	/* Overrides the restriction that the real or effective user ID of a
	149	process sending a signal must match the real or effective user ID
	150	of the process receiving the signal. */
	151
	152	#define CAP_KILL 5
	153
	154	/* Allows setgid(2) manipulation */
	155	/* Allows setgroups(2) */
	156	/* Allows forged gids on socket credentials passing. */
	157
	158	#define CAP_SETGID 6
	159
	160	/* Allows setuid(2) manipulation (including fsuid). /
	161	/* Allows forged pids on socket credentials passing. */
	162
	163	#define CAP_SETUID 7
	164
	165
	166	/**
	167	** Linux-specific capabilities
	168	**/
	169
e338d263 AM	170	/* Without VFS support for capabilities:
	171	* Transfer any capability in your permitted set to any pid,
	172	* remove any capability in your permitted set from any pid
	173	* With VFS support for capabilities (neither of above, but)
3b7391de SH	174	* Add any capability from current's capability bounding set
	175	* to the current process' inheritable set
	176	* Allow taking bits out of capability bounding set
3898b1b4	177	* Allow modification of the securebits for a process
e338d263	178	*/
1da177e4 LT	179
	180	#define CAP_SETPCAP 8
	181
	182	/* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
	183
	184	#define CAP_LINUX_IMMUTABLE 9
	185
	186	/* Allows binding to TCP/UDP sockets below 1024 */
	187	/* Allows binding to ATM VCIs below 32 */
	188
	189	#define CAP_NET_BIND_SERVICE 10
	190
	191	/* Allow broadcasting, listen to multicast */
	192
	193	#define CAP_NET_BROADCAST 11
	194
	195	/* Allow interface configuration */
	196	/* Allow administration of IP firewall, masquerading and accounting */
	197	/* Allow setting debug option on sockets */
	198	/* Allow modification of routing tables */
	199	/* Allow setting arbitrary process / process group ownership on
	200	sockets */
	201	/* Allow binding to any address for transparent proxying */
	202	/* Allow setting TOS (type of service) */
	203	/* Allow setting promiscuous mode */
	204	/* Allow clearing driver statistics */
	205	/* Allow multicasting */
	206	/* Allow read/write of device-specific registers */
	207	/* Allow activation of ATM control sockets */
	208
	209	#define CAP_NET_ADMIN 12
	210
	211	/* Allow use of RAW sockets */
	212	/* Allow use of PACKET sockets */
	213
	214	#define CAP_NET_RAW 13
	215
	216	/* Allow locking of shared memory segments */
	217	/* Allow mlock and mlockall (which doesn't really have anything to do
	218	with IPC) */
	219
	220	#define CAP_IPC_LOCK 14
	221
	222	/* Override IPC ownership checks */
	223
	224	#define CAP_IPC_OWNER 15
	225
	226	/* Insert and remove kernel modules - modify kernel without limit */
1da177e4 LT	227	#define CAP_SYS_MODULE 16
	228
	229	/* Allow ioperm/iopl access */
	230	/* Allow sending USB messages to any device via /proc/bus/usb */
	231
	232	#define CAP_SYS_RAWIO 17
	233
	234	/* Allow use of chroot() */
	235
	236	#define CAP_SYS_CHROOT 18
	237
	238	/* Allow ptrace() of any process */
	239
	240	#define CAP_SYS_PTRACE 19
	241
	242	/* Allow configuration of process accounting */
	243
	244	#define CAP_SYS_PACCT 20
	245
	246	/* Allow configuration of the secure attention key */
	247	/* Allow administration of the random device */
	248	/* Allow examination and configuration of disk quotas */
1da177e4 LT	249	/* Allow setting the domainname */
	250	/* Allow setting the hostname */
	251	/* Allow calling bdflush() */
	252	/* Allow mount() and umount(), setting up new smb connection */
	253	/* Allow some autofs root ioctls */
	254	/* Allow nfsservctl */
	255	/* Allow VM86_REQUEST_IRQ */
	256	/* Allow to read/write pci config on alpha */
	257	/* Allow irix_prctl on mips (setstacksize) */
	258	/* Allow flushing all cache on m68k (sys_cacheflush) */
	259	/* Allow removing semaphores */
	260	/* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
	261	and shared memory */
	262	/* Allow locking/unlocking of shared memory segment */
	263	/* Allow turning swap on/off */
	264	/* Allow forged pids on socket credentials passing */
	265	/* Allow setting readahead and flushing buffers on block devices */
	266	/* Allow setting geometry in floppy driver */
	267	/* Allow turning DMA on/off in xd driver */
	268	/* Allow administration of md devices (mostly the above, but some
	269	extra ioctls) */
	270	/* Allow tuning the ide driver */
	271	/* Allow access to the nvram device */
	272	/* Allow administration of apm_bios, serial and bttv (TV) device */
	273	/* Allow manufacturer commands in isdn CAPI support driver */
	274	/* Allow reading non-standardized portions of pci configuration space */
	275	/* Allow DDI debug ioctl on sbpcd driver */
	276	/* Allow setting up serial ports */
	277	/* Allow sending raw qic-117 commands */
	278	/* Allow enabling/disabling tagged queuing on SCSI controllers and sending
	279	arbitrary SCSI commands */
	280	/* Allow setting encryption key on loopback filesystem */
bce5f6ba	281	/* Allow setting zone reclaim policy */
1da177e4 LT	282
	283	#define CAP_SYS_ADMIN 21
	284
	285	/* Allow use of reboot() */
	286
	287	#define CAP_SYS_BOOT 22
	288
	289	/* Allow raising priority and setting priority on other (different
	290	UID) processes */
	291	/* Allow use of FIFO and round-robin (realtime) scheduling on own
	292	processes and setting the scheduling algorithm used by another
	293	process. */
	294	/* Allow setting cpu affinity on other processes */
	295
	296	#define CAP_SYS_NICE 23
	297
	298	/* Override resource limits. Set resource limits. */
	299	/* Override quota limits. */
	300	/* Override reserved space on ext2 filesystem */
	301	/* Modify data journaling mode on ext3 filesystem (uses journaling
	302	resources) */
b5376771	303	/* NOTE: ext2 honors fsuid when checking for resource overrides, so
1da177e4 LT	304	you can override using fsuid too */
	305	/* Override size restrictions on IPC message queues */
	306	/* Allow more than 64hz interrupts from the real-time clock */
	307	/* Override max number of consoles on console allocation */
	308	/* Override max number of keymaps */
	309
	310	#define CAP_SYS_RESOURCE 24
	311
	312	/* Allow manipulation of system clock */
	313	/* Allow irix_stime on mips */
	314	/* Allow setting the real-time clock */
	315
	316	#define CAP_SYS_TIME 25
	317
	318	/* Allow configuration of tty devices */
	319	/* Allow vhangup() of tty */
	320
	321	#define CAP_SYS_TTY_CONFIG 26
	322
	323	/* Allow the privileged aspects of mknod() */
	324
	325	#define CAP_MKNOD 27
	326
	327	/* Allow taking of leases on files */
	328
	329	#define CAP_LEASE 28
	330
	331	#define CAP_AUDIT_WRITE 29
	332
	333	#define CAP_AUDIT_CONTROL 30
	334
b5376771 SH	335	#define CAP_SETFCAP 31
b5376771 SH	336
e114e473 CS	337	/* Override MAC access.
	338	The base kernel enforces no MAC policy.
	339	An LSM may enforce a MAC policy, and if it does and it chooses
	340	to implement capability based overrides of that policy, this is
	341	the capability it should use to do so. */
	342
	343	#define CAP_MAC_OVERRIDE 32
	344
	345	/* Allow MAC configuration or state changes.
	346	The base kernel requires no MAC configuration.
	347	An LSM may enforce a MAC policy, and if it does and it chooses
	348	to implement capability based checks on modifications to that
	349	policy or the data required to maintain it, this is the
	350	capability it should use to do so. */
	351
	352	#define CAP_MAC_ADMIN 33
	353
ce6ada35 SH	354	/* Allow configuring the kernel's syslog (printk behaviour) */
	355
	356	#define CAP_SYSLOG 34
	357
9a7adcf5 JS	358	/* Allow triggering something that will wake the system */
	359
	360	#define CAP_WAKE_ALARM 35
	361
	362
	363	#define CAP_LAST_CAP CAP_WAKE_ALARM
3b7391de SH	364
	365	#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
	366
e338d263 AM	367	/*
	368	* Bit location of each capability (used by user-space library and kernel)
	369	*/
	370
	371	#define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */
	372	#define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */
	373
1da177e4	374	#ifdef __KERNEL__
1da177e4	375
3486740a SH	376	struct dentry;
	377	struct user_namespace;
	378
3486740a SH	379	struct user_namespace *current_user_ns(void);
	380
	381	extern const kernel_cap_t __cap_empty_set;
3486740a SH	382	extern const kernel_cap_t __cap_init_eff_set;
3486740a SH	383
1da177e4 LT	384	/*
	385	* Internal kernel functions only
	386	*/
b5376771	387
e338d263	388	#define CAP_FOR_EACH_U32(__capi) \
ca05a99a	389	for (__capi = 0; __capi < _KERNEL_CAPABILITY_U32S; ++__capi)
e338d263	390
0ad30b8f SH	391	/*
	392	* CAP_FS_MASK and CAP_NFSD_MASKS:
	393	*
	394	* The fs mask is all the privileges that fsuid==0 historically meant.
	395	* At one time in the past, that included CAP_MKNOD and CAP_LINUX_IMMUTABLE.
	396	*
	397	* It has never meant setting security.* and trusted.* xattrs.
	398	*
	399	* We could also define fsmask as follows:
	400	* 1. CAP_FS_MASK is the privilege to bypass all fs-related DAC permissions
	401	* 2. The security.* and trusted.* xattrs are fs-related MAC permissions
	402	*/
	403
e338d263	404	# define CAP_FS_MASK_B0 (CAP_TO_MASK(CAP_CHOWN) \
0ad30b8f	405	\| CAP_TO_MASK(CAP_MKNOD) \
e338d263 AM	406	\| CAP_TO_MASK(CAP_DAC_OVERRIDE) \
	407	\| CAP_TO_MASK(CAP_DAC_READ_SEARCH) \
	408	\| CAP_TO_MASK(CAP_FOWNER) \
	409	\| CAP_TO_MASK(CAP_FSETID))
	410
e114e473 CS	411	# define CAP_FS_MASK_B1 (CAP_TO_MASK(CAP_MAC_OVERRIDE))
e114e473 CS	412
ca05a99a	413	#if _KERNEL_CAPABILITY_U32S != 2
e338d263 AM	414	# error Fix up hand-coded capability macro initializers
	415	#else /* HAND-CODED capability initializers */
	416
25f2ea9f DH	417	# define CAP_EMPTY_SET ((kernel_cap_t){{ 0, 0 }})
25f2ea9f DH	418	# define CAP_FULL_SET ((kernel_cap_t){{ ~0, ~0 }})
0ad30b8f SH	419	# define CAP_FS_SET ((kernel_cap_t){{ CAP_FS_MASK_B0 \
	420	\| CAP_TO_MASK(CAP_LINUX_IMMUTABLE), \
	421	CAP_FS_MASK_B1 } })
76a67ec6	422	# define CAP_NFSD_SET ((kernel_cap_t){{ CAP_FS_MASK_B0 \
0ad30b8f SH	423	\| CAP_TO_MASK(CAP_SYS_RESOURCE), \
0ad30b8f SH	424	CAP_FS_MASK_B1 } })
e338d263	425
ca05a99a	426	#endif /* _KERNEL_CAPABILITY_U32S != 2 */
e338d263	427
e338d263	428	# define cap_clear(c) do { (c) = __cap_empty_set; } while (0)
e338d263 AM	429
	430	#define cap_raise(c, flag) ((c).cap[CAP_TO_INDEX(flag)] \|= CAP_TO_MASK(flag))
	431	#define cap_lower(c, flag) ((c).cap[CAP_TO_INDEX(flag)] &= ~CAP_TO_MASK(flag))
	432	#define cap_raised(c, flag) ((c).cap[CAP_TO_INDEX(flag)] & CAP_TO_MASK(flag))
	433
	434	#define CAP_BOP_ALL(c, a, b, OP) \
	435	do { \
	436	unsigned __capi; \
	437	CAP_FOR_EACH_U32(__capi) { \
	438	c.cap[__capi] = a.cap[__capi] OP b.cap[__capi]; \
	439	} \
	440	} while (0)
	441
	442	#define CAP_UOP_ALL(c, a, OP) \
	443	do { \
	444	unsigned __capi; \
	445	CAP_FOR_EACH_U32(__capi) { \
	446	c.cap[__capi] = OP a.cap[__capi]; \
	447	} \
	448	} while (0)
	449
	450	static inline kernel_cap_t cap_combine(const kernel_cap_t a,
	451	const kernel_cap_t b)
	452	{
	453	kernel_cap_t dest;
	454	CAP_BOP_ALL(dest, a, b, \|);
	455	return dest;
	456	}
1da177e4	457
e338d263 AM	458	static inline kernel_cap_t cap_intersect(const kernel_cap_t a,
	459	const kernel_cap_t b)
	460	{
	461	kernel_cap_t dest;
	462	CAP_BOP_ALL(dest, a, b, &);
	463	return dest;
	464	}
1da177e4	465
e338d263 AM	466	static inline kernel_cap_t cap_drop(const kernel_cap_t a,
	467	const kernel_cap_t drop)
	468	{
	469	kernel_cap_t dest;
	470	CAP_BOP_ALL(dest, a, drop, &~);
	471	return dest;
	472	}
1da177e4	473
e338d263 AM	474	static inline kernel_cap_t cap_invert(const kernel_cap_t c)
	475	{
	476	kernel_cap_t dest;
	477	CAP_UOP_ALL(dest, c, ~);
	478	return dest;
	479	}
1da177e4	480
e338d263 AM	481	static inline int cap_isclear(const kernel_cap_t a)
	482	{
	483	unsigned __capi;
	484	CAP_FOR_EACH_U32(__capi) {
	485	if (a.cap[__capi] != 0)
	486	return 0;
	487	}
	488	return 1;
	489	}
1da177e4	490
9d36be76 EP	491	/*
	492	* Check if "a" is a subset of "set".
	493	* return 1 if ALL of the capabilities in "a" are also in "set"
	494	* cap_issubset(0101, 1111) will return 1
	495	* return 0 if ANY of the capabilities in "a" are not in "set"
	496	* cap_issubset(1111, 0101) will return 0
	497	*/
e338d263 AM	498	static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
	499	{
	500	kernel_cap_t dest;
	501	dest = cap_drop(a, set);
	502	return cap_isclear(dest);
	503	}
1da177e4	504
e338d263	505	/* Used to decide between falling back on the old suser() or fsuser(). */
1da177e4	506
e338d263	507	static inline int cap_is_fs_cap(int cap)
1da177e4	508	{
e338d263 AM	509	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
e338d263 AM	510	return !!(CAP_TO_MASK(cap) & __cap_fs_set.cap[CAP_TO_INDEX(cap)]);
1da177e4 LT	511	}
1da177e4 LT	512
e338d263	513	static inline kernel_cap_t cap_drop_fs_set(const kernel_cap_t a)
1da177e4	514	{
e338d263 AM	515	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
e338d263 AM	516	return cap_drop(a, __cap_fs_set);
1da177e4 LT	517	}
1da177e4 LT	518
e338d263 AM	519	static inline kernel_cap_t cap_raise_fs_set(const kernel_cap_t a,
e338d263 AM	520	const kernel_cap_t permitted)
1da177e4	521	{
e338d263 AM	522	const kernel_cap_t __cap_fs_set = CAP_FS_SET;
	523	return cap_combine(a,
	524	cap_intersect(permitted, __cap_fs_set));
1da177e4 LT	525	}
1da177e4 LT	526
e338d263	527	static inline kernel_cap_t cap_drop_nfsd_set(const kernel_cap_t a)
1da177e4	528	{
e338d263 AM	529	const kernel_cap_t __cap_fs_set = CAP_NFSD_SET;
e338d263 AM	530	return cap_drop(a, __cap_fs_set);
1da177e4 LT	531	}
1da177e4 LT	532
e338d263 AM	533	static inline kernel_cap_t cap_raise_nfsd_set(const kernel_cap_t a,
	534	const kernel_cap_t permitted)
	535	{
	536	const kernel_cap_t __cap_nfsd_set = CAP_NFSD_SET;
	537	return cap_combine(a,
	538	cap_intersect(permitted, __cap_nfsd_set));
	539	}
1da177e4	540
3263245d SH	541	extern bool has_capability(struct task_struct *t, int cap);
	542	extern bool has_ns_capability(struct task_struct *t,
	543	struct user_namespace *ns, int cap);
	544	extern bool has_capability_noaudit(struct task_struct *t, int cap);
7b61d648 EP	545	extern bool has_ns_capability_noaudit(struct task_struct *t,
7b61d648 EP	546	struct user_namespace *ns, int cap);
3486740a SH	547	extern bool capable(int cap);
3486740a SH	548	extern bool ns_capable(struct user_namespace *ns, int cap);
47a150ed	549	extern bool nsown_capable(int cap);
c59ede7b	550
851f7ff5	551	/* audit system wants to get cap info from files as well */
851f7ff5 EP	552	extern int get_vfs_caps_from_disk(const struct dentry dentry, struct cpu_vfs_cap_data cpu_caps);
851f7ff5 EP	553
1da177e4 LT	554	#endif /* __KERNEL__ */
	555
	556	#endif /* !_LINUX_CAPABILITY_H */