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) (1 << ((x) & 31)) /* mask for indexed __u32 */ 428 429 430 #endif /* _LINUX_CAPABILITY_H */