linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3 * This is <linux/capability.h>
4 *
5 * Andrew G. Morgan <morgan@kernel.org>
6 * Alexander Kjeldaas <astor@guardian.no>
7 * with help from Aleph1, Roland Buresund and Andrew Main.
8 *
9 * See here for the libcap library ("POSIX draft" compliance):
10 *
11 * ftp://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
12 */
13
14 #ifndef _LINUX_CAPABILITY_H
15 #define _LINUX_CAPABILITY_H
16
17 #include <linux/types.h>
18
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
22 it. */
23
24 /* Note, cap_t, is defined by POSIX (draft) 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
28 etc.. */
29
30 #define _LINUX_CAPABILITY_VERSION_1 0x19980330
31 #define _LINUX_CAPABILITY_U32S_1 1
32
33 #define _LINUX_CAPABILITY_VERSION_2 0x20071026 /* deprecated - use v3 */
34 #define _LINUX_CAPABILITY_U32S_2 2
35
36 #define _LINUX_CAPABILITY_VERSION_3 0x20080522
37 #define _LINUX_CAPABILITY_U32S_3 2
38
39 typedef struct __user_cap_header_struct {
40 __u32 version;
41 int pid;
42 } *cap_user_header_t;
43
44 typedef struct __user_cap_data_struct {
45 __u32 effective;
46 __u32 permitted;
47 __u32 inheritable;
48 } *cap_user_data_t;
49
50
51 #define VFS_CAP_REVISION_MASK 0xFF000000
52 #define VFS_CAP_REVISION_SHIFT 24
53 #define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
54 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001
55
56 #define VFS_CAP_REVISION_1 0x01000000
57 #define VFS_CAP_U32_1 1
58 #define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1))
59
60 #define VFS_CAP_REVISION_2 0x02000000
61 #define VFS_CAP_U32_2 2
62 #define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2))
63
64 #define VFS_CAP_REVISION_3 0x03000000
65 #define VFS_CAP_U32_3 2
66 #define XATTR_CAPS_SZ_3 (sizeof(__le32)*(2 + 2*VFS_CAP_U32_3))
67
68 #define XATTR_CAPS_SZ XATTR_CAPS_SZ_3
69 #define VFS_CAP_U32 VFS_CAP_U32_3
70 #define VFS_CAP_REVISION VFS_CAP_REVISION_3
71
72 struct vfs_cap_data {
73 __le32 magic_etc; /* Little endian */
74 struct {
75 __le32 permitted; /* Little endian */
76 __le32 inheritable; /* Little endian */
77 } data[VFS_CAP_U32];
78 };
79
80 /*
81 * same as vfs_cap_data but with a rootid at the end
82 */
83 struct vfs_ns_cap_data {
84 __le32 magic_etc;
85 struct {
86 __le32 permitted; /* Little endian */
87 __le32 inheritable; /* Little endian */
88 } data[VFS_CAP_U32];
89 __le32 rootid;
90 };
91
92
93 /*
94 * Backwardly compatible definition for source code - trapped in a
95 * 32-bit world. If you find you need this, please consider using
96 * libcap to untrap yourself...
97 */
98 #define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1
99 #define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1
100
101
102
103 /**
104 ** POSIX-draft defined capabilities.
105 **/
106
107 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
108 overrides the restriction of changing file ownership and group
109 ownership. */
110
111 #define CAP_CHOWN 0
112
113 /* Override all DAC access, including ACL execute access if
114 [_POSIX_ACL] is defined. Excluding DAC access covered by
115 CAP_LINUX_IMMUTABLE. */
116
117 #define CAP_DAC_OVERRIDE 1
118
119 /* Overrides all DAC restrictions regarding read and search on files
120 and directories, including ACL restrictions if [_POSIX_ACL] is
121 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
122
123 #define CAP_DAC_READ_SEARCH 2
124
125 /* Overrides all restrictions about allowed operations on files, where
126 file owner ID must be equal to the user ID, except where CAP_FSETID
127 is applicable. It doesn't override MAC and DAC restrictions. */
128
129 #define CAP_FOWNER 3
130
131 /* Overrides the following restrictions that the effective user ID
132 shall match the file owner ID when setting the S_ISUID and S_ISGID
133 bits on that file; that the effective group ID (or one of the
134 supplementary group IDs) shall match the file owner ID when setting
135 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are
136 cleared on successful return from chown(2) (not implemented). */
137
138 #define CAP_FSETID 4
139
140 /* Overrides the restriction that the real or effective user ID of a
141 process sending a signal must match the real or effective user ID
142 of the process receiving the signal. */
143
144 #define CAP_KILL 5
145
146 /* Allows setgid(2) manipulation */
147 /* Allows setgroups(2) */
148 /* Allows forged gids on socket credentials passing. */
149
150 #define CAP_SETGID 6
151
152 /* Allows set*uid(2) manipulation (including fsuid). */
153 /* Allows forged pids on socket credentials passing. */
154
155 #define CAP_SETUID 7
156
157
158 /**
159 ** Linux-specific capabilities
160 **/
161
162 /* Without VFS support for capabilities:
163 * Transfer any capability in your permitted set to any pid,
164 * remove any capability in your permitted set from any pid
165 * With VFS support for capabilities (neither of above, but)
166 * Add any capability from current's capability bounding set
167 * to the current process' inheritable set
168 * Allow taking bits out of capability bounding set
169 * Allow modification of the securebits for a process
170 */
171
172 #define CAP_SETPCAP 8
173
174 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */
175
176 #define CAP_LINUX_IMMUTABLE 9
177
178 /* Allows binding to TCP/UDP sockets below 1024 */
179 /* Allows binding to ATM VCIs below 32 */
180
181 #define CAP_NET_BIND_SERVICE 10
182
183 /* Allow broadcasting, listen to multicast */
184
185 #define CAP_NET_BROADCAST 11
186
187 /* Allow interface configuration */
188 /* Allow administration of IP firewall, masquerading and accounting */
189 /* Allow setting debug option on sockets */
190 /* Allow modification of routing tables */
191 /* Allow setting arbitrary process / process group ownership on
192 sockets */
193 /* Allow binding to any address for transparent proxying (also via NET_RAW) */
194 /* Allow setting TOS (type of service) */
195 /* Allow setting promiscuous mode */
196 /* Allow clearing driver statistics */
197 /* Allow multicasting */
198 /* Allow read/write of device-specific registers */
199 /* Allow activation of ATM control sockets */
200
201 #define CAP_NET_ADMIN 12
202
203 /* Allow use of RAW sockets */
204 /* Allow use of PACKET sockets */
205 /* Allow binding to any address for transparent proxying (also via NET_ADMIN) */
206
207 #define CAP_NET_RAW 13
208
209 /* Allow locking of shared memory segments */
210 /* Allow mlock and mlockall (which doesn't really have anything to do
211 with IPC) */
212
213 #define CAP_IPC_LOCK 14
214
215 /* Override IPC ownership checks */
216
217 #define CAP_IPC_OWNER 15
218
219 /* Insert and remove kernel modules - modify kernel without limit */
220 #define CAP_SYS_MODULE 16
221
222 /* Allow ioperm/iopl access */
223 /* Allow sending USB messages to any device via /dev/bus/usb */
224
225 #define CAP_SYS_RAWIO 17
226
227 /* Allow use of chroot() */
228
229 #define CAP_SYS_CHROOT 18
230
231 /* Allow ptrace() of any process */
232
233 #define CAP_SYS_PTRACE 19
234
235 /* Allow configuration of process accounting */
236
237 #define CAP_SYS_PACCT 20
238
239 /* Allow configuration of the secure attention key */
240 /* Allow administration of the random device */
241 /* Allow examination and configuration of disk quotas */
242 /* Allow setting the domainname */
243 /* Allow setting the hostname */
244 /* Allow mount() and umount(), setting up new smb connection */
245 /* Allow some autofs root ioctls */
246 /* Allow nfsservctl */
247 /* Allow VM86_REQUEST_IRQ */
248 /* Allow to read/write pci config on alpha */
249 /* Allow irix_prctl on mips (setstacksize) */
250 /* Allow flushing all cache on m68k (sys_cacheflush) */
251 /* Allow removing semaphores */
252 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores
253 and shared memory */
254 /* Allow locking/unlocking of shared memory segment */
255 /* Allow turning swap on/off */
256 /* Allow forged pids on socket credentials passing */
257 /* Allow setting readahead and flushing buffers on block devices */
258 /* Allow setting geometry in floppy driver */
259 /* Allow turning DMA on/off in xd driver */
260 /* Allow administration of md devices (mostly the above, but some
261 extra ioctls) */
262 /* Allow tuning the ide driver */
263 /* Allow access to the nvram device */
264 /* Allow administration of apm_bios, serial and bttv (TV) device */
265 /* Allow manufacturer commands in isdn CAPI support driver */
266 /* Allow reading non-standardized portions of pci configuration space */
267 /* Allow DDI debug ioctl on sbpcd driver */
268 /* Allow setting up serial ports */
269 /* Allow sending raw qic-117 commands */
270 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending
271 arbitrary SCSI commands */
272 /* Allow setting encryption key on loopback filesystem */
273 /* Allow setting zone reclaim policy */
274 /* Allow everything under CAP_BPF and CAP_PERFMON for backward compatibility */
275
276 #define CAP_SYS_ADMIN 21
277
278 /* Allow use of reboot() */
279
280 #define CAP_SYS_BOOT 22
281
282 /* Allow raising priority and setting priority on other (different
283 UID) processes */
284 /* Allow use of FIFO and round-robin (realtime) scheduling on own
285 processes and setting the scheduling algorithm used by another
286 process. */
287 /* Allow setting cpu affinity on other processes */
288 /* Allow setting realtime ioprio class */
289 /* Allow setting ioprio class on other processes */
290
291 #define CAP_SYS_NICE 23
292
293 /* Override resource limits. Set resource limits. */
294 /* Override quota limits. */
295 /* Override reserved space on ext2 filesystem */
296 /* Modify data journaling mode on ext3 filesystem (uses journaling
297 resources) */
298 /* NOTE: ext2 honors fsuid when checking for resource overrides, so
299 you can override using fsuid too */
300 /* Override size restrictions on IPC message queues */
301 /* Allow more than 64hz interrupts from the real-time clock */
302 /* Override max number of consoles on console allocation */
303 /* Override max number of keymaps */
304 /* Control memory reclaim behavior */
305
306 #define CAP_SYS_RESOURCE 24
307
308 /* Allow manipulation of system clock */
309 /* Allow irix_stime on mips */
310 /* Allow setting the real-time clock */
311
312 #define CAP_SYS_TIME 25
313
314 /* Allow configuration of tty devices */
315 /* Allow vhangup() of tty */
316
317 #define CAP_SYS_TTY_CONFIG 26
318
319 /* Allow the privileged aspects of mknod() */
320
321 #define CAP_MKNOD 27
322
323 /* Allow taking of leases on files */
324
325 #define CAP_LEASE 28
326
327 /* Allow writing the audit log via unicast netlink socket */
328
329 #define CAP_AUDIT_WRITE 29
330
331 /* Allow configuration of audit via unicast netlink socket */
332
333 #define CAP_AUDIT_CONTROL 30
334
335 /* Set or remove capabilities on files.
336 Map uid=0 into a child user namespace. */
337
338 #define CAP_SETFCAP 31
339
340 /* Override MAC access.
341 The base kernel enforces no MAC policy.
342 An LSM may enforce a MAC policy, and if it does and it chooses
343 to implement capability based overrides of that policy, this is
344 the capability it should use to do so. */
345
346 #define CAP_MAC_OVERRIDE 32
347
348 /* Allow MAC configuration or state changes.
349 The base kernel requires no MAC configuration.
350 An LSM may enforce a MAC policy, and if it does and it chooses
351 to implement capability based checks on modifications to that
352 policy or the data required to maintain it, this is the
353 capability it should use to do so. */
354
355 #define CAP_MAC_ADMIN 33
356
357 /* Allow configuring the kernel's syslog (printk behaviour) */
358
359 #define CAP_SYSLOG 34
360
361 /* Allow triggering something that will wake the system */
362
363 #define CAP_WAKE_ALARM 35
364
365 /* Allow preventing system suspends */
366
367 #define CAP_BLOCK_SUSPEND 36
368
369 /* Allow reading the audit log via multicast netlink socket */
370
371 #define CAP_AUDIT_READ 37
372
373 /*
374 * Allow system performance and observability privileged operations
375 * using perf_events, i915_perf and other kernel subsystems
376 */
377
378 #define CAP_PERFMON 38
379
380 /*
381 * CAP_BPF allows the following BPF operations:
382 * - Creating all types of BPF maps
383 * - Advanced verifier features
384 * - Indirect variable access
385 * - Bounded loops
386 * - BPF to BPF function calls
387 * - Scalar precision tracking
388 * - Larger complexity limits
389 * - Dead code elimination
390 * - And potentially other features
391 * - Loading BPF Type Format (BTF) data
392 * - Retrieve xlated and JITed code of BPF programs
393 * - Use bpf_spin_lock() helper
394 *
395 * CAP_PERFMON relaxes the verifier checks further:
396 * - BPF progs can use of pointer-to-integer conversions
397 * - speculation attack hardening measures are bypassed
398 * - bpf_probe_read to read arbitrary kernel memory is allowed
399 * - bpf_trace_printk to print kernel memory is allowed
400 *
401 * CAP_SYS_ADMIN is required to use bpf_probe_write_user.
402 *
403 * CAP_SYS_ADMIN is required to iterate system wide loaded
404 * programs, maps, links, BTFs and convert their IDs to file descriptors.
405 *
406 * CAP_PERFMON and CAP_BPF are required to load tracing programs.
407 * CAP_NET_ADMIN and CAP_BPF are required to load networking programs.
408 */
409 #define CAP_BPF 39
410
411
412 /* Allow checkpoint/restore related operations */
413 /* Allow PID selection during clone3() */
414 /* Allow writing to ns_last_pid */
415
416 #define CAP_CHECKPOINT_RESTORE 40
417
418 #define CAP_LAST_CAP CAP_CHECKPOINT_RESTORE
419
420 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)
421
422 /*
423 * Bit location of each capability (used by user-space library and kernel)
424 */
425
426 #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */
427 #define CAP_TO_MASK(x) (1U << ((x) & 31)) /* mask for indexed __u32 */
428
429
430 #endif /* _LINUX_CAPABILITY_H */
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