capability.h (13522B) - Raw
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 struct __user_cap_data_struct { 45 __u32 effective; 46 __u32 permitted; 47 __u32 inheritable; 48 }; 49 typedef struct __user_cap_data_struct *cap_user_data_t; 50 51 52 #define VFS_CAP_REVISION_MASK 0xFF000000 53 #define VFS_CAP_REVISION_SHIFT 24 54 #define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK 55 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001 56 57 #define VFS_CAP_REVISION_1 0x01000000 58 #define VFS_CAP_U32_1 1 59 #define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1)) 60 61 #define VFS_CAP_REVISION_2 0x02000000 62 #define VFS_CAP_U32_2 2 63 #define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2)) 64 65 #define VFS_CAP_REVISION_3 0x03000000 66 #define VFS_CAP_U32_3 2 67 #define XATTR_CAPS_SZ_3 (sizeof(__le32)*(2 + 2*VFS_CAP_U32_3)) 68 69 #define XATTR_CAPS_SZ XATTR_CAPS_SZ_3 70 #define VFS_CAP_U32 VFS_CAP_U32_3 71 #define VFS_CAP_REVISION VFS_CAP_REVISION_3 72 73 struct vfs_cap_data { 74 __le32 magic_etc; /* Little endian */ 75 struct { 76 __le32 permitted; /* Little endian */ 77 __le32 inheritable; /* Little endian */ 78 } data[VFS_CAP_U32]; 79 }; 80 81 /* 82 * same as vfs_cap_data but with a rootid at the end 83 */ 84 struct vfs_ns_cap_data { 85 __le32 magic_etc; 86 struct { 87 __le32 permitted; /* Little endian */ 88 __le32 inheritable; /* Little endian */ 89 } data[VFS_CAP_U32]; 90 __le32 rootid; 91 }; 92 93 94 /* 95 * Backwardly compatible definition for source code - trapped in a 96 * 32-bit world. If you find you need this, please consider using 97 * libcap to untrap yourself... 98 */ 99 #define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1 100 #define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1 101 102 103 104 /** 105 ** POSIX-draft defined capabilities. 106 **/ 107 108 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this 109 overrides the restriction of changing file ownership and group 110 ownership. */ 111 112 #define CAP_CHOWN 0 113 114 /* Override all DAC access, including ACL execute access if 115 [_POSIX_ACL] is defined. Excluding DAC access covered by 116 CAP_LINUX_IMMUTABLE. */ 117 118 #define CAP_DAC_OVERRIDE 1 119 120 /* Overrides all DAC restrictions regarding read and search on files 121 and directories, including ACL restrictions if [_POSIX_ACL] is 122 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */ 123 124 #define CAP_DAC_READ_SEARCH 2 125 126 /* Overrides all restrictions about allowed operations on files, where 127 file owner ID must be equal to the user ID, except where CAP_FSETID 128 is applicable. It doesn't override MAC and DAC restrictions. */ 129 130 #define CAP_FOWNER 3 131 132 /* Overrides the following restrictions that the effective user ID 133 shall match the file owner ID when setting the S_ISUID and S_ISGID 134 bits on that file; that the effective group ID (or one of the 135 supplementary group IDs) shall match the file owner ID when setting 136 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are 137 cleared on successful return from chown(2) (not implemented). */ 138 139 #define CAP_FSETID 4 140 141 /* Overrides the restriction that the real or effective user ID of a 142 process sending a signal must match the real or effective user ID 143 of the process receiving the signal. */ 144 145 #define CAP_KILL 5 146 147 /* Allows setgid(2) manipulation */ 148 /* Allows setgroups(2) */ 149 /* Allows forged gids on socket credentials passing. */ 150 151 #define CAP_SETGID 6 152 153 /* Allows set*uid(2) manipulation (including fsuid). */ 154 /* Allows forged pids on socket credentials passing. */ 155 156 #define CAP_SETUID 7 157 158 159 /** 160 ** Linux-specific capabilities 161 **/ 162 163 /* Without VFS support for capabilities: 164 * Transfer any capability in your permitted set to any pid, 165 * remove any capability in your permitted set from any pid 166 * With VFS support for capabilities (neither of above, but) 167 * Add any capability from current's capability bounding set 168 * to the current process' inheritable set 169 * Allow taking bits out of capability bounding set 170 * Allow modification of the securebits for a process 171 */ 172 173 #define CAP_SETPCAP 8 174 175 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */ 176 177 #define CAP_LINUX_IMMUTABLE 9 178 179 /* Allows binding to TCP/UDP sockets below 1024 */ 180 /* Allows binding to ATM VCIs below 32 */ 181 182 #define CAP_NET_BIND_SERVICE 10 183 184 /* Allow broadcasting, listen to multicast */ 185 186 #define CAP_NET_BROADCAST 11 187 188 /* Allow interface configuration */ 189 /* Allow administration of IP firewall, masquerading and accounting */ 190 /* Allow setting debug option on sockets */ 191 /* Allow modification of routing tables */ 192 /* Allow setting arbitrary process / process group ownership on 193 sockets */ 194 /* Allow binding to any address for transparent proxying (also via NET_RAW) */ 195 /* Allow setting TOS (type of service) */ 196 /* Allow setting promiscuous mode */ 197 /* Allow clearing driver statistics */ 198 /* Allow multicasting */ 199 /* Allow read/write of device-specific registers */ 200 /* Allow activation of ATM control sockets */ 201 202 #define CAP_NET_ADMIN 12 203 204 /* Allow use of RAW sockets */ 205 /* Allow use of PACKET sockets */ 206 /* Allow binding to any address for transparent proxying (also via NET_ADMIN) */ 207 208 #define CAP_NET_RAW 13 209 210 /* Allow locking of shared memory segments */ 211 /* Allow mlock and mlockall (which doesn't really have anything to do 212 with IPC) */ 213 214 #define CAP_IPC_LOCK 14 215 216 /* Override IPC ownership checks */ 217 218 #define CAP_IPC_OWNER 15 219 220 /* Insert and remove kernel modules - modify kernel without limit */ 221 #define CAP_SYS_MODULE 16 222 223 /* Allow ioperm/iopl access */ 224 /* Allow sending USB messages to any device via /dev/bus/usb */ 225 226 #define CAP_SYS_RAWIO 17 227 228 /* Allow use of chroot() */ 229 230 #define CAP_SYS_CHROOT 18 231 232 /* Allow ptrace() of any process */ 233 234 #define CAP_SYS_PTRACE 19 235 236 /* Allow configuration of process accounting */ 237 238 #define CAP_SYS_PACCT 20 239 240 /* Allow configuration of the secure attention key */ 241 /* Allow administration of the random device */ 242 /* Allow examination and configuration of disk quotas */ 243 /* Allow setting the domainname */ 244 /* Allow setting the hostname */ 245 /* Allow mount() and umount(), setting up new smb connection */ 246 /* Allow some autofs root ioctls */ 247 /* Allow nfsservctl */ 248 /* Allow VM86_REQUEST_IRQ */ 249 /* Allow to read/write pci config on alpha */ 250 /* Allow irix_prctl on mips (setstacksize) */ 251 /* Allow flushing all cache on m68k (sys_cacheflush) */ 252 /* Allow removing semaphores */ 253 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores 254 and shared memory */ 255 /* Allow locking/unlocking of shared memory segment */ 256 /* Allow turning swap on/off */ 257 /* Allow forged pids on socket credentials passing */ 258 /* Allow setting readahead and flushing buffers on block devices */ 259 /* Allow setting geometry in floppy driver */ 260 /* Allow turning DMA on/off in xd driver */ 261 /* Allow administration of md devices (mostly the above, but some 262 extra ioctls) */ 263 /* Allow tuning the ide driver */ 264 /* Allow access to the nvram device */ 265 /* Allow administration of apm_bios, serial and bttv (TV) device */ 266 /* Allow manufacturer commands in isdn CAPI support driver */ 267 /* Allow reading non-standardized portions of pci configuration space */ 268 /* Allow DDI debug ioctl on sbpcd driver */ 269 /* Allow setting up serial ports */ 270 /* Allow sending raw qic-117 commands */ 271 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending 272 arbitrary SCSI commands */ 273 /* Allow setting encryption key on loopback filesystem */ 274 /* Allow setting zone reclaim policy */ 275 /* Allow everything under CAP_BPF and CAP_PERFMON for backward compatibility */ 276 277 #define CAP_SYS_ADMIN 21 278 279 /* Allow use of reboot() */ 280 281 #define CAP_SYS_BOOT 22 282 283 /* Allow raising priority and setting priority on other (different 284 UID) processes */ 285 /* Allow use of FIFO and round-robin (realtime) scheduling on own 286 processes and setting the scheduling algorithm used by another 287 process. */ 288 /* Allow setting cpu affinity on other processes */ 289 /* Allow setting realtime ioprio class */ 290 /* Allow setting ioprio class on other processes */ 291 292 #define CAP_SYS_NICE 23 293 294 /* Override resource limits. Set resource limits. */ 295 /* Override quota limits. */ 296 /* Override reserved space on ext2 filesystem */ 297 /* Modify data journaling mode on ext3 filesystem (uses journaling 298 resources) */ 299 /* NOTE: ext2 honors fsuid when checking for resource overrides, so 300 you can override using fsuid too */ 301 /* Override size restrictions on IPC message queues */ 302 /* Allow more than 64hz interrupts from the real-time clock */ 303 /* Override max number of consoles on console allocation */ 304 /* Override max number of keymaps */ 305 /* Control memory reclaim behavior */ 306 307 #define CAP_SYS_RESOURCE 24 308 309 /* Allow manipulation of system clock */ 310 /* Allow irix_stime on mips */ 311 /* Allow setting the real-time clock */ 312 313 #define CAP_SYS_TIME 25 314 315 /* Allow configuration of tty devices */ 316 /* Allow vhangup() of tty */ 317 318 #define CAP_SYS_TTY_CONFIG 26 319 320 /* Allow the privileged aspects of mknod() */ 321 322 #define CAP_MKNOD 27 323 324 /* Allow taking of leases on files */ 325 326 #define CAP_LEASE 28 327 328 /* Allow writing the audit log via unicast netlink socket */ 329 330 #define CAP_AUDIT_WRITE 29 331 332 /* Allow configuration of audit via unicast netlink socket */ 333 334 #define CAP_AUDIT_CONTROL 30 335 336 /* Set or remove capabilities on files. 337 Map uid=0 into a child user namespace. */ 338 339 #define CAP_SETFCAP 31 340 341 /* Override MAC access. 342 The base kernel enforces no MAC policy. 343 An LSM may enforce a MAC policy, and if it does and it chooses 344 to implement capability based overrides of that policy, this is 345 the capability it should use to do so. */ 346 347 #define CAP_MAC_OVERRIDE 32 348 349 /* Allow MAC configuration or state changes. 350 The base kernel requires no MAC configuration. 351 An LSM may enforce a MAC policy, and if it does and it chooses 352 to implement capability based checks on modifications to that 353 policy or the data required to maintain it, this is the 354 capability it should use to do so. */ 355 356 #define CAP_MAC_ADMIN 33 357 358 /* Allow configuring the kernel's syslog (printk behaviour) */ 359 360 #define CAP_SYSLOG 34 361 362 /* Allow triggering something that will wake the system */ 363 364 #define CAP_WAKE_ALARM 35 365 366 /* Allow preventing system suspends */ 367 368 #define CAP_BLOCK_SUSPEND 36 369 370 /* Allow reading the audit log via multicast netlink socket */ 371 372 #define CAP_AUDIT_READ 37 373 374 /* 375 * Allow system performance and observability privileged operations 376 * using perf_events, i915_perf and other kernel subsystems 377 */ 378 379 #define CAP_PERFMON 38 380 381 /* 382 * CAP_BPF allows the following BPF operations: 383 * - Creating all types of BPF maps 384 * - Advanced verifier features 385 * - Indirect variable access 386 * - Bounded loops 387 * - BPF to BPF function calls 388 * - Scalar precision tracking 389 * - Larger complexity limits 390 * - Dead code elimination 391 * - And potentially other features 392 * - Loading BPF Type Format (BTF) data 393 * - Retrieve xlated and JITed code of BPF programs 394 * - Use bpf_spin_lock() helper 395 * 396 * CAP_PERFMON relaxes the verifier checks further: 397 * - BPF progs can use of pointer-to-integer conversions 398 * - speculation attack hardening measures are bypassed 399 * - bpf_probe_read to read arbitrary kernel memory is allowed 400 * - bpf_trace_printk to print kernel memory is allowed 401 * 402 * CAP_SYS_ADMIN is required to use bpf_probe_write_user. 403 * 404 * CAP_SYS_ADMIN is required to iterate system wide loaded 405 * programs, maps, links, BTFs and convert their IDs to file descriptors. 406 * 407 * CAP_PERFMON and CAP_BPF are required to load tracing programs. 408 * CAP_NET_ADMIN and CAP_BPF are required to load networking programs. 409 */ 410 #define CAP_BPF 39 411 412 413 /* Allow checkpoint/restore related operations */ 414 /* Allow PID selection during clone3() */ 415 /* Allow writing to ns_last_pid */ 416 417 #define CAP_CHECKPOINT_RESTORE 40 418 419 #define CAP_LAST_CAP CAP_CHECKPOINT_RESTORE 420 421 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) 422 423 /* 424 * Bit location of each capability (used by user-space library and kernel) 425 */ 426 427 #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */ 428 #define CAP_TO_MASK(x) (1U << ((x) & 31)) /* mask for indexed __u32 */ 429 430 431 #endif /* _LINUX_CAPABILITY_H */