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Roland Buresund and Andrew Main. 8 * 9 * See here for the libcap2 library (compliant with Section 25 of 10 * the withdrawn POSIX 1003.1e Draft 17): 11 * 12 * https://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2/ 13 */ 14 15 #ifndef _UAPI_LINUX_CAPABILITY_H 16 #define _UAPI_LINUX_CAPABILITY_H 17 18 #include <linux/types.h> 19 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 25 /* Note, cap_t, is defined by POSIX (draft) to be an "opaque" pointer to 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.. */ 30 31 #define _LINUX_CAPABILITY_VERSION_1 0x19980330 32 #define _LINUX_CAPABILITY_U32S_1 1 33 34 #define _LINUX_CAPABILITY_VERSION_2 0x20071026 /* deprecated - use v3 */ 35 #define _LINUX_CAPABILITY_U32S_2 2 36 37 #define _LINUX_CAPABILITY_VERSION_3 0x20080522 38 #define _LINUX_CAPABILITY_U32S_3 2 39 40 typedef struct __user_cap_header_struct { 41 __u32 version; 42 int pid; 43 } __user *cap_user_header_t; 44 45 struct __user_cap_data_struct { 46 __u32 effective; 47 __u32 permitted; 48 __u32 inheritable; 49 }; 50 typedef struct __user_cap_data_struct __user *cap_user_data_t; 51 52 53 #define VFS_CAP_REVISION_MASK 0xFF000000 54 #define VFS_CAP_REVISION_SHIFT 24 55 #define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK 56 #define VFS_CAP_FLAGS_EFFECTIVE 0x000001 57 58 #define VFS_CAP_REVISION_1 0x01000000 59 #define VFS_CAP_U32_1 1 60 #define XATTR_CAPS_SZ_1 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_1)) 61 62 #define VFS_CAP_REVISION_2 0x02000000 63 #define VFS_CAP_U32_2 2 64 #define XATTR_CAPS_SZ_2 (sizeof(__le32)*(1 + 2*VFS_CAP_U32_2)) 65 66 #define VFS_CAP_REVISION_3 0x03000000 67 #define VFS_CAP_U32_3 2 68 #define XATTR_CAPS_SZ_3 (sizeof(__le32)*(2 + 2*VFS_CAP_U32_3)) 69 70 #define XATTR_CAPS_SZ XATTR_CAPS_SZ_3 71 #define VFS_CAP_U32 VFS_CAP_U32_3 72 #define VFS_CAP_REVISION VFS_CAP_REVISION_3 73 74 struct vfs_cap_data { 75 __le32 magic_etc; /* Little endian */ 76 struct { 77 __le32 permitted; /* Little endian */ 78 __le32 inheritable; /* Little endian */ 79 } data[VFS_CAP_U32]; 80 }; 81 82 /* 83 * same as vfs_cap_data but with a rootid at the end 84 */ 85 struct vfs_ns_cap_data { 86 __le32 magic_etc; 87 struct { 88 __le32 permitted; /* Little endian */ 89 __le32 inheritable; /* Little endian */ 90 } data[VFS_CAP_U32]; 91 __le32 rootid; 92 }; 93 94 #ifndef __KERNEL__ 95 96 /* 97 * Backwardly compatible definition for source code - trapped in a 98 * 32-bit world. If you find you need this, please consider using 99 * libcap to untrap yourself... 100 */ 101 #define _LINUX_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_1 102 #define _LINUX_CAPABILITY_U32S _LINUX_CAPABILITY_U32S_1 103 104 #endif 105 106 107 /** 108 ** POSIX-draft defined capabilities. 109 **/ 110 111 /* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this 112 overrides the restriction of changing file ownership and group 113 ownership. */ 114 115 #define CAP_CHOWN 0 116 117 /* Override all DAC access, including ACL execute access if 118 [_POSIX_ACL] is defined. Excluding DAC access covered by 119 CAP_LINUX_IMMUTABLE. */ 120 121 #define CAP_DAC_OVERRIDE 1 122 123 /* Overrides all DAC restrictions regarding read and search on files 124 and directories, including ACL restrictions if [_POSIX_ACL] is 125 defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */ 126 127 #define CAP_DAC_READ_SEARCH 2 128 129 /* Overrides all restrictions about allowed operations on files, where 130 file owner ID must be equal to the user ID, except where CAP_FSETID 131 is applicable. It doesn't override MAC and DAC restrictions. */ 132 133 #define CAP_FOWNER 3 134 135 /* Overrides the following restrictions that the effective user ID 136 shall match the file owner ID when setting the S_ISUID and S_ISGID 137 bits on that file; that the effective group ID (or one of the 138 supplementary group IDs) shall match the file owner ID when setting 139 the S_ISGID bit on that file; that the S_ISUID and S_ISGID bits are 140 cleared on successful return from chown(2) (not implemented). */ 141 142 #define CAP_FSETID 4 143 144 /* Overrides the restriction that the real or effective user ID of a 145 process sending a signal must match the real or effective user ID 146 of the process receiving the signal. */ 147 148 #define CAP_KILL 5 149 150 /* Allows setgid(2) manipulation */ 151 /* Allows setgroups(2) */ 152 /* Allows forged gids on socket credentials passing. */ 153 154 #define CAP_SETGID 6 155 156 /* Allows set*uid(2) manipulation (including fsuid). */ 157 /* Allows forged pids on socket credentials passing. */ 158 159 #define CAP_SETUID 7 160 161 162 /** 163 ** Linux-specific capabilities 164 **/ 165 166 /* Without VFS support for capabilities: 167 * Transfer any capability in your permitted set to any pid, 168 * remove any capability in your permitted set from any pid 169 * With VFS support for capabilities (neither of above, but) 170 * Add any capability from current's capability bounding set 171 * to the current process' inheritable set 172 * Allow taking bits out of capability bounding set 173 * Allow modification of the securebits for a process 174 */ 175 176 #define CAP_SETPCAP 8 177 178 /* Allow modification of S_IMMUTABLE and S_APPEND file attributes */ 179 180 #define CAP_LINUX_IMMUTABLE 9 181 182 /* Allows binding to TCP/UDP sockets below 1024 */ 183 /* Allows binding to ATM VCIs below 32 */ 184 185 #define CAP_NET_BIND_SERVICE 10 186 187 /* Allow broadcasting, listen to multicast */ 188 189 #define CAP_NET_BROADCAST 11 190 191 /* Allow interface configuration */ 192 /* Allow administration of IP firewall, masquerading and accounting */ 193 /* Allow setting debug option on sockets */ 194 /* Allow modification of routing tables */ 195 /* Allow setting arbitrary process / process group ownership on 196 sockets */ 197 /* Allow binding to any address for transparent proxying (also via NET_RAW) */ 198 /* Allow setting TOS (type of service) */ 199 /* Allow setting promiscuous mode */ 200 /* Allow clearing driver statistics */ 201 /* Allow multicasting */ 202 /* Allow read/write of device-specific registers */ 203 /* Allow activation of ATM control sockets */ 204 205 #define CAP_NET_ADMIN 12 206 207 /* Allow use of RAW sockets */ 208 /* Allow use of PACKET sockets */ 209 /* Allow binding to any address for transparent proxying (also via NET_ADMIN) */ 210 211 #define CAP_NET_RAW 13 212 213 /* Allow locking of shared memory segments */ 214 /* Allow mlock and mlockall (which doesn't really have anything to do 215 with IPC) */ 216 217 #define CAP_IPC_LOCK 14 218 219 /* Override IPC ownership checks */ 220 221 #define CAP_IPC_OWNER 15 222 223 /* Insert and remove kernel modules - modify kernel without limit */ 224 #define CAP_SYS_MODULE 16 225 226 /* Allow ioperm/iopl access */ 227 /* Allow sending USB messages to any device via /dev/bus/usb */ 228 229 #define CAP_SYS_RAWIO 17 230 231 /* Allow use of chroot() */ 232 233 #define CAP_SYS_CHROOT 18 234 235 /* Allow ptrace() of any process */ 236 237 #define CAP_SYS_PTRACE 19 238 239 /* Allow configuration of process accounting */ 240 241 #define CAP_SYS_PACCT 20 242 243 /* Allow configuration of the secure attention key */ 244 /* Allow administration of the random device */ 245 /* Allow examination and configuration of disk quotas */ 246 /* Allow setting the domainname */ 247 /* Allow setting the hostname */ 248 /* Allow mount() and umount(), setting up new smb connection */ 249 /* Allow some autofs root ioctls */ 250 /* Allow nfsservctl */ 251 /* Allow VM86_REQUEST_IRQ */ 252 /* Allow to read/write pci config on alpha */ 253 /* Allow irix_prctl on mips (setstacksize) */ 254 /* Allow flushing all cache on m68k (sys_cacheflush) */ 255 /* Allow removing semaphores */ 256 /* Used instead of CAP_CHOWN to "chown" IPC message queues, semaphores 257 and shared memory */ 258 /* Allow locking/unlocking of shared memory segment */ 259 /* Allow turning swap on/off */ 260 /* Allow forged pids on socket credentials passing */ 261 /* Allow setting readahead and flushing buffers on block devices */ 262 /* Allow setting geometry in floppy driver */ 263 /* Allow turning DMA on/off in xd driver */ 264 /* Allow administration of md devices (mostly the above, but some 265 extra ioctls) */ 266 /* Allow tuning the ide driver */ 267 /* Allow access to the nvram device */ 268 /* Allow administration of apm_bios, serial and bttv (TV) device */ 269 /* Allow manufacturer commands in isdn CAPI support driver */ 270 /* Allow reading non-standardized portions of pci configuration space */ 271 /* Allow DDI debug ioctl on sbpcd driver */ 272 /* Allow setting up serial ports */ 273 /* Allow sending raw qic-117 commands */ 274 /* Allow enabling/disabling tagged queuing on SCSI controllers and sending 275 arbitrary SCSI commands */ 276 /* Allow setting encryption key on loopback filesystem */ 277 /* Allow setting zone reclaim policy */ 278 /* Allow everything under CAP_BPF and CAP_PERFMON for backward compatibility */ 279 /* Allow setting hardware protection emergency action */ 280 281 #define CAP_SYS_ADMIN 21 282 283 /* Allow use of reboot() */ 284 285 #define CAP_SYS_BOOT 22 286 287 /* Allow raising priority and setting priority on other (different 288 UID) processes */ 289 /* Allow use of FIFO and round-robin (realtime) scheduling on own 290 processes and setting the scheduling algorithm used by another 291 process. */ 292 /* Allow setting cpu affinity on other processes */ 293 /* Allow setting realtime ioprio class */ 294 /* Allow setting ioprio class 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) */ 303 /* NOTE: ext2 honors fsuid when checking for resource overrides, so 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 /* Control memory reclaim behavior */ 310 311 #define CAP_SYS_RESOURCE 24 312 313 /* Allow manipulation of system clock */ 314 /* Allow irix_stime on mips */ 315 /* Allow setting the real-time clock */ 316 317 #define CAP_SYS_TIME 25 318 319 /* Allow configuration of tty devices */ 320 /* Allow vhangup() of tty */ 321 322 #define CAP_SYS_TTY_CONFIG 26 323 324 /* Allow the privileged aspects of mknod() */ 325 326 #define CAP_MKNOD 27 327 328 /* Allow taking of leases on files */ 329 330 #define CAP_LEASE 28 331 332 /* Allow writing the audit log via unicast netlink socket */ 333 334 #define CAP_AUDIT_WRITE 29 335 336 /* Allow configuration of audit via unicast netlink socket */ 337 338 #define CAP_AUDIT_CONTROL 30 339 340 /* Set or remove capabilities on files. 341 Map uid=0 into a child user namespace. */ 342 343 #define CAP_SETFCAP 31 344 345 /* Override MAC access. 346 The base kernel enforces no MAC policy. 347 An LSM may enforce a MAC policy, and if it does and it chooses 348 to implement capability based overrides of that policy, this is 349 the capability it should use to do so. */ 350 351 #define CAP_MAC_OVERRIDE 32 352 353 /* Allow MAC configuration or state changes. 354 The base kernel requires no MAC configuration. 355 An LSM may enforce a MAC policy, and if it does and it chooses 356 to implement capability based checks on modifications to that 357 policy or the data required to maintain it, this is the 358 capability it should use to do so. */ 359 360 #define CAP_MAC_ADMIN 33 361 362 /* Allow configuring the kernel's syslog (printk behaviour) */ 363 364 #define CAP_SYSLOG 34 365 366 /* Allow triggering something that will wake the system */ 367 368 #define CAP_WAKE_ALARM 35 369 370 /* Allow preventing system suspends */ 371 372 #define CAP_BLOCK_SUSPEND 36 373 374 /* Allow reading the audit log via multicast netlink socket */ 375 376 #define CAP_AUDIT_READ 37 377 378 /* 379 * Allow system performance and observability privileged operations 380 * using perf_events, i915_perf and other kernel subsystems 381 */ 382 383 #define CAP_PERFMON 38 384 385 /* 386 * CAP_BPF allows the following BPF operations: 387 * - Creating all types of BPF maps 388 * - Advanced verifier features 389 * - Indirect variable access 390 * - Bounded loops 391 * - BPF to BPF function calls 392 * - Scalar precision tracking 393 * - Larger complexity limits 394 * - Dead code elimination 395 * - And potentially other features 396 * - Loading BPF Type Format (BTF) data 397 * - Retrieve xlated and JITed code of BPF programs 398 * - Use bpf_spin_lock() helper 399 * 400 * CAP_PERFMON relaxes the verifier checks further: 401 * - BPF progs can use of pointer-to-integer conversions 402 * - speculation attack hardening measures are bypassed 403 * - bpf_probe_read to read arbitrary kernel memory is allowed 404 * - bpf_trace_printk to print kernel memory is allowed 405 * 406 * CAP_SYS_ADMIN is required to use bpf_probe_write_user. 407 * 408 * CAP_SYS_ADMIN is required to iterate system wide loaded 409 * programs, maps, links, BTFs and convert their IDs to file descriptors. 410 * 411 * CAP_PERFMON and CAP_BPF are required to load tracing programs. 412 * CAP_NET_ADMIN and CAP_BPF are required to load networking programs. 413 */ 414 #define CAP_BPF 39 415 416 417 /* Allow checkpoint/restore related operations */ 418 /* Allow PID selection during clone3() */ 419 /* Allow writing to ns_last_pid */ 420 421 #define CAP_CHECKPOINT_RESTORE 40 422 423 #define CAP_LAST_CAP CAP_CHECKPOINT_RESTORE 424 425 #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) 426 427 /* 428 * Bit location of each capability (used by user-space library and kernel) 429 */ 430 431 #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */ 432 #define CAP_TO_MASK(x) (1U << ((x) & 31)) /* mask for indexed __u32 */ 433 434 435 #endif /* _UAPI_LINUX_CAPABILITY_H */ 436