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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/capability.h
2 * This is <linux/capability.h>
4 * Andrew G. Morgan <morgan@transmeta.com>
5 * Alexander Kjeldaas <astor@guardian.no>
6 * with help from Aleph1, Roland Buresund and Andrew Main.
8 * See here for the libcap library ("POSIX draft" compliance):
10 * ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.2/
13 #ifndef _LINUX_CAPABILITY_H
14 #define _LINUX_CAPABILITY_H
16 #include <linux/types.h>
17 #include <linux/compiler.h>
19 /* User-level do most of the mapping between kernel and user
20 capabilities based on the version tag given by the kernel. The
21 kernel might be somewhat backwards compatible, but don't bet on
24 /* XXX - Note, cap_t, is defined by POSIX to be an "opaque" pointer to
25 a set of three capability sets. The transposition of 3*the
26 following structure to such a composite is better handled in a user
27 library since the draft standard requires the use of malloc/free
30 #define _LINUX_CAPABILITY_VERSION 0x19980330
32 typedef struct __user_cap_header_struct
{
35 } __user
*cap_user_header_t
;
37 typedef struct __user_cap_data_struct
{
41 } __user
*cap_user_data_t
;
45 #include <linux/spinlock.h>
46 #include <asm/current.h>
48 /* #define STRICT_CAP_T_TYPECHECKS */
50 #ifdef STRICT_CAP_T_TYPECHECKS
52 typedef struct kernel_cap_struct
{
58 typedef __u32 kernel_cap_t
;
62 #define _USER_CAP_HEADER_SIZE (2*sizeof(__u32))
63 #define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
69 ** POSIX-draft defined capabilities.
72 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
73 overrides the restriction of changing file ownership and group
78 /* Override all DAC access, including ACL execute access if
79 [_POSIX_ACL] is defined. Excluding DAC access covered by
80 CAP_LINUX_IMMUTABLE. */
82 #define CAP_DAC_OVERRIDE 1
84 /* Overrides all DAC restrictions regarding read and search on files
85 and directories, including ACL restrictions if [_POSIX_ACL] is
86 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
88 #define CAP_DAC_READ_SEARCH 2
90 /* Overrides all restrictions about allowed operations on files, where
91 file owner ID must be equal to the user ID, except where CAP_FSETID
92 is applicable. It doesn't override MAC and DAC restrictions. */
96 /* Overrides the following restrictions that the effective user ID
97 shall match the file owner ID when setting the S_ISUID and S_ISGID
98 bits on that file; that the effective group ID (or one of the
99 supplementary group IDs) shall match the file owner ID when setting
100 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
101 cleared on successful return from chown(2) (not implemented). */
105 /* Used to decide between falling back on the old suser() or fsuser(). */
107 #define CAP_FS_MASK 0x1f
109 /* Overrides the restriction that the real or effective user ID of a
110 process sending a signal must match the real or effective user ID
111 of the process receiving the signal. */
115 /* Allows setgid(2) manipulation */
116 /* Allows setgroups(2) */
117 /* Allows forged gids on socket credentials passing. */
121 /* Allows set*uid(2) manipulation (including fsuid). */
122 /* Allows forged pids on socket credentials passing. */
128 ** Linux-specific capabilities
131 /* Transfer any capability in your permitted set to any pid,
132 remove any capability in your permitted set from any pid */
134 #define CAP_SETPCAP 8
136 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
138 #define CAP_LINUX_IMMUTABLE 9
140 /* Allows binding to TCP/UDP sockets below 1024 */
141 /* Allows binding to ATM VCIs below 32 */
143 #define CAP_NET_BIND_SERVICE 10
145 /* Allow broadcasting, listen to multicast */
147 #define CAP_NET_BROADCAST 11
149 /* Allow interface configuration */
150 /* Allow administration of IP firewall, masquerading and accounting */
151 /* Allow setting debug option on sockets */
152 /* Allow modification of routing tables */
153 /* Allow setting arbitrary process / process group ownership on
155 /* Allow binding to any address for transparent proxying */
156 /* Allow setting TOS (type of service) */
157 /* Allow setting promiscuous mode */
158 /* Allow clearing driver statistics */
159 /* Allow multicasting */
160 /* Allow read/write of device-specific registers */
161 /* Allow activation of ATM control sockets */
163 #define CAP_NET_ADMIN 12
165 /* Allow use of RAW sockets */
166 /* Allow use of PACKET sockets */
168 #define CAP_NET_RAW 13
170 /* Allow locking of shared memory segments */
171 /* Allow mlock and mlockall (which doesn't really have anything to do
174 #define CAP_IPC_LOCK 14
176 /* Override IPC ownership checks */
178 #define CAP_IPC_OWNER 15
180 /* Insert and remove kernel modules - modify kernel without limit */
181 /* Modify cap_bset */
182 #define CAP_SYS_MODULE 16
184 /* Allow ioperm/iopl access */
185 /* Allow sending USB messages to any device via /proc/bus/usb */
187 #define CAP_SYS_RAWIO 17
189 /* Allow use of chroot() */
191 #define CAP_SYS_CHROOT 18
193 /* Allow ptrace() of any process */
195 #define CAP_SYS_PTRACE 19
197 /* Allow configuration of process accounting */
199 #define CAP_SYS_PACCT 20
201 /* Allow configuration of the secure attention key */
202 /* Allow administration of the random device */
203 /* Allow examination and configuration of disk quotas */
204 /* Allow configuring the kernel's syslog (printk behaviour) */
205 /* Allow setting the domainname */
206 /* Allow setting the hostname */
207 /* Allow calling bdflush() */
208 /* Allow mount() and umount(), setting up new smb connection */
209 /* Allow some autofs root ioctls */
210 /* Allow nfsservctl */
211 /* Allow VM86_REQUEST_IRQ */
212 /* Allow to read/write pci config on alpha */
213 /* Allow irix_prctl on mips (setstacksize) */
214 /* Allow flushing all cache on m68k (sys_cacheflush) */
215 /* Allow removing semaphores */
216 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
218 /* Allow locking/unlocking of shared memory segment */
219 /* Allow turning swap on/off */
220 /* Allow forged pids on socket credentials passing */
221 /* Allow setting readahead and flushing buffers on block devices */
222 /* Allow setting geometry in floppy driver */
223 /* Allow turning DMA on/off in xd driver */
224 /* Allow administration of md devices (mostly the above, but some
226 /* Allow tuning the ide driver */
227 /* Allow access to the nvram device */
228 /* Allow administration of apm_bios, serial and bttv (TV) device */
229 /* Allow manufacturer commands in isdn CAPI support driver */
230 /* Allow reading non-standardized portions of pci configuration space */
231 /* Allow DDI debug ioctl on sbpcd driver */
232 /* Allow setting up serial ports */
233 /* Allow sending raw qic-117 commands */
234 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
235 arbitrary SCSI commands */
236 /* Allow setting encryption key on loopback filesystem */
237 /* Allow setting zone reclaim policy */
239 #define CAP_SYS_ADMIN 21
241 /* Allow use of reboot() */
243 #define CAP_SYS_BOOT 22
245 /* Allow raising priority and setting priority on other (different
247 /* Allow use of FIFO and round-robin (realtime) scheduling on own
248 processes and setting the scheduling algorithm used by another
250 /* Allow setting cpu affinity on other processes */
252 #define CAP_SYS_NICE 23
254 /* Override resource limits. Set resource limits. */
255 /* Override quota limits. */
256 /* Override reserved space on ext2 filesystem */
257 /* Modify data journaling mode on ext3 filesystem (uses journaling
259 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
260 you can override using fsuid too */
261 /* Override size restrictions on IPC message queues */
262 /* Allow more than 64hz interrupts from the real-time clock */
263 /* Override max number of consoles on console allocation */
264 /* Override max number of keymaps */
266 #define CAP_SYS_RESOURCE 24
268 /* Allow manipulation of system clock */
269 /* Allow irix_stime on mips */
270 /* Allow setting the real-time clock */
272 #define CAP_SYS_TIME 25
274 /* Allow configuration of tty devices */
275 /* Allow vhangup() of tty */
277 #define CAP_SYS_TTY_CONFIG 26
279 /* Allow the privileged aspects of mknod() */
283 /* Allow taking of leases on files */
287 #define CAP_AUDIT_WRITE 29
289 #define CAP_AUDIT_CONTROL 30
295 extern kernel_cap_t cap_bset
;
298 * Internal kernel functions only
301 #ifdef STRICT_CAP_T_TYPECHECKS
303 #define to_cap_t(x) { x }
304 #define cap_t(x) (x).cap
308 #define to_cap_t(x) (x)
313 #define CAP_EMPTY_SET to_cap_t(0)
314 #define CAP_FULL_SET to_cap_t(~0)
315 #define CAP_INIT_EFF_SET to_cap_t(~0 & ~CAP_TO_MASK(CAP_SETPCAP))
316 #define CAP_INIT_INH_SET to_cap_t(0)
318 #define CAP_TO_MASK(x) (1 << (x))
319 #define cap_raise(c, flag) (cap_t(c) |= CAP_TO_MASK(flag))
320 #define cap_lower(c, flag) (cap_t(c) &= ~CAP_TO_MASK(flag))
321 #define cap_raised(c, flag) (cap_t(c) & CAP_TO_MASK(flag))
323 static inline kernel_cap_t
cap_combine(kernel_cap_t a
, kernel_cap_t b
)
326 cap_t(dest
) = cap_t(a
) | cap_t(b
);
330 static inline kernel_cap_t
cap_intersect(kernel_cap_t a
, kernel_cap_t b
)
333 cap_t(dest
) = cap_t(a
) & cap_t(b
);
337 static inline kernel_cap_t
cap_drop(kernel_cap_t a
, kernel_cap_t drop
)
340 cap_t(dest
) = cap_t(a
) & ~cap_t(drop
);
344 static inline kernel_cap_t
cap_invert(kernel_cap_t c
)
347 cap_t(dest
) = ~cap_t(c
);
351 #define cap_isclear(c) (!cap_t(c))
352 #define cap_issubset(a,set) (!(cap_t(a) & ~cap_t(set)))
354 #define cap_clear(c) do { cap_t(c) = 0; } while(0)
355 #define cap_set_full(c) do { cap_t(c) = ~0; } while(0)
356 #define cap_mask(c,mask) do { cap_t(c) &= cap_t(mask); } while(0)
358 #define cap_is_fs_cap(c) (CAP_TO_MASK(c) & CAP_FS_MASK)
360 int capable(int cap
);
361 int __capable(struct task_struct
*t
, int cap
);
363 #endif /* __KERNEL__ */
365 #endif /* !_LINUX_CAPABILITY_H */