Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_uid16.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2001 The FreeBSD Project 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 34 #include <sys/fcntl.h> 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 #include <sys/priv.h> 41 #include <sys/proc.h> 42 #include <sys/sdt.h> 43 #include <sys/syscallsubr.h> 44 #include <sys/sysproto.h> 45 #include <sys/systm.h> 46 47 #ifdef COMPAT_LINUX32 48 #include <machine/../linux32/linux.h> 49 #include <machine/../linux32/linux32_proto.h> 50 #else 51 #include <machine/../linux/linux.h> 52 #include <machine/../linux/linux_proto.h> 53 #endif 54 55 #include <compat/linux/linux_dtrace.h> 56 #include <compat/linux/linux_util.h> 57 58 /* DTrace init */ 59 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 60 61 /** 62 * DTrace probes in this module. 63 */ 64 LIN_SDT_PROBE_DEFINE3(uid16, linux_chown16, entry, "char *", "l_uid16_t", 65 "l_gid16_t"); 66 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, conv_path, "char *"); 67 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, return, "int"); 68 LIN_SDT_PROBE_DEFINE3(uid16, linux_lchown16, entry, "char *", "l_uid16_t", 69 "l_gid16_t"); 70 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, conv_path, "char *"); 71 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, return, "int"); 72 LIN_SDT_PROBE_DEFINE2(uid16, linux_setgroups16, entry, "l_uint", "l_gid16_t *"); 73 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, copyin_error, "int"); 74 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, priv_check_cred_error, "int"); 75 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, return, "int"); 76 LIN_SDT_PROBE_DEFINE2(uid16, linux_getgroups16, entry, "l_uint", "l_gid16_t *"); 77 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, copyout_error, "int"); 78 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, return, "int"); 79 LIN_SDT_PROBE_DEFINE0(uid16, linux_getgid16, entry); 80 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgid16, return, "int"); 81 LIN_SDT_PROBE_DEFINE0(uid16, linux_getuid16, entry); 82 LIN_SDT_PROBE_DEFINE1(uid16, linux_getuid16, return, "int"); 83 LIN_SDT_PROBE_DEFINE0(uid16, linux_getegid16, entry); 84 LIN_SDT_PROBE_DEFINE1(uid16, linux_getegid16, return, "int"); 85 LIN_SDT_PROBE_DEFINE0(uid16, linux_geteuid16, entry); 86 LIN_SDT_PROBE_DEFINE1(uid16, linux_geteuid16, return, "int"); 87 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, entry, "l_gid16_t"); 88 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, return, "int"); 89 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, entry, "l_uid16_t"); 90 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, return, "int"); 91 LIN_SDT_PROBE_DEFINE2(uid16, linux_setregid16, entry, "l_gid16_t", "l_gid16_t"); 92 LIN_SDT_PROBE_DEFINE1(uid16, linux_setregid16, return, "int"); 93 LIN_SDT_PROBE_DEFINE2(uid16, linux_setreuid16, entry, "l_uid16_t", "l_uid16_t"); 94 LIN_SDT_PROBE_DEFINE1(uid16, linux_setreuid16, return, "int"); 95 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresgid16, entry, "l_gid16_t", "l_gid16_t", 96 "l_gid16_t"); 97 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresgid16, return, "int"); 98 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresuid16, entry, "l_uid16_t", "l_uid16_t", 99 "l_uid16_t"); 100 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresuid16, return, "int"); 101 102 DUMMY(setfsuid16); 103 DUMMY(setfsgid16); 104 DUMMY(getresuid16); 105 DUMMY(getresgid16); 106 107 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x) 108 109 int 110 linux_chown16(struct thread *td, struct linux_chown16_args *args) 111 { 112 char *path; 113 int error; 114 115 if (!LUSECONVPATH(td) && !SDT_PROBES_ENABLED()) { 116 error = kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE, 117 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0); 118 } else { 119 LCONVPATHEXIST(td, args->path, &path); 120 /* 121 * The DTrace probes have to be after the LCONVPATHEXIST, as 122 * LCONVPATHEXIST may return on its own and we do not want to 123 * have a stray entry without the corresponding return. 124 */ 125 LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid, 126 args->gid); 127 LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path); 128 129 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, 130 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0); 131 LFREEPATH(path); 132 LIN_SDT_PROBE1(uid16, linux_chown16, return, error); 133 } 134 return (error); 135 } 136 137 int 138 linux_lchown16(struct thread *td, struct linux_lchown16_args *args) 139 { 140 char *path; 141 int error; 142 143 if (!LUSECONVPATH(td) && !SDT_PROBES_ENABLED()) { 144 error = kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE, 145 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW); 146 } else { 147 LCONVPATHEXIST(td, args->path, &path); 148 149 /* 150 * The DTrace probes have to be after the LCONVPATHEXIST, as 151 * LCONVPATHEXIST may return on its own and we do not want to 152 * have a stray entry without the corresponding return. 153 */ 154 LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid, 155 args->gid); 156 LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path); 157 158 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, 159 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW); 160 LFREEPATH(path); 161 LIN_SDT_PROBE1(uid16, linux_lchown16, return, error); 162 } 163 return (error); 164 } 165 166 int 167 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args) 168 { 169 struct ucred *newcred, *oldcred; 170 l_gid16_t *linux_gidset; 171 gid_t *bsd_gidset; 172 int ngrp, error; 173 struct proc *p; 174 175 LIN_SDT_PROBE2(uid16, linux_setgroups16, entry, args->gidsetsize, 176 args->gidset); 177 178 ngrp = args->gidsetsize; 179 if (ngrp < 0 || ngrp >= ngroups_max + 1) { 180 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, EINVAL); 181 return (EINVAL); 182 } 183 linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK); 184 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 185 if (error) { 186 LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error); 187 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error); 188 free(linux_gidset, M_LINUX); 189 return (error); 190 } 191 newcred = crget(); 192 p = td->td_proc; 193 PROC_LOCK(p); 194 oldcred = crcopysafe(p, newcred); 195 196 /* 197 * cr_groups[0] holds egid. Setting the whole set from 198 * the supplied set will cause egid to be changed too. 199 * Keep cr_groups[0] unchanged to prevent that. 200 */ 201 202 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS)) != 0) { 203 PROC_UNLOCK(p); 204 crfree(newcred); 205 206 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error, 207 error); 208 goto out; 209 } 210 211 if (ngrp > 0) { 212 newcred->cr_ngroups = ngrp + 1; 213 214 bsd_gidset = newcred->cr_groups; 215 ngrp--; 216 while (ngrp >= 0) { 217 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 218 ngrp--; 219 } 220 } 221 else 222 newcred->cr_ngroups = 1; 223 224 setsugid(td->td_proc); 225 proc_set_cred(p, newcred); 226 PROC_UNLOCK(p); 227 crfree(oldcred); 228 error = 0; 229 out: 230 free(linux_gidset, M_LINUX); 231 232 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error); 233 return (error); 234 } 235 236 int 237 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 238 { 239 struct ucred *cred; 240 l_gid16_t *linux_gidset; 241 gid_t *bsd_gidset; 242 int bsd_gidsetsz, ngrp, error; 243 244 LIN_SDT_PROBE2(uid16, linux_getgroups16, entry, args->gidsetsize, 245 args->gidset); 246 247 cred = td->td_ucred; 248 bsd_gidset = cred->cr_groups; 249 bsd_gidsetsz = cred->cr_ngroups - 1; 250 251 /* 252 * cr_groups[0] holds egid. Returning the whole set 253 * here will cause a duplicate. Exclude cr_groups[0] 254 * to prevent that. 255 */ 256 257 if ((ngrp = args->gidsetsize) == 0) { 258 td->td_retval[0] = bsd_gidsetsz; 259 260 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0); 261 return (0); 262 } 263 264 if (ngrp < bsd_gidsetsz) { 265 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, EINVAL); 266 return (EINVAL); 267 } 268 269 ngrp = 0; 270 linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset), 271 M_LINUX, M_WAITOK); 272 while (ngrp < bsd_gidsetsz) { 273 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 274 ngrp++; 275 } 276 277 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 278 free(linux_gidset, M_LINUX); 279 if (error) { 280 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error); 281 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, error); 282 return (error); 283 } 284 285 td->td_retval[0] = ngrp; 286 287 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0); 288 return (0); 289 } 290 291 int 292 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 293 { 294 295 LIN_SDT_PROBE0(uid16, linux_getgid16, entry); 296 297 td->td_retval[0] = td->td_ucred->cr_rgid; 298 299 LIN_SDT_PROBE1(uid16, linux_getgid16, return, 0); 300 return (0); 301 } 302 303 int 304 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 305 { 306 307 LIN_SDT_PROBE0(uid16, linux_getuid16, entry); 308 309 td->td_retval[0] = td->td_ucred->cr_ruid; 310 311 LIN_SDT_PROBE1(uid16, linux_getuid16, return, 0); 312 return (0); 313 } 314 315 int 316 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 317 { 318 struct getegid_args bsd; 319 int error; 320 321 LIN_SDT_PROBE0(uid16, linux_getegid16, entry); 322 323 error = sys_getegid(td, &bsd); 324 325 LIN_SDT_PROBE1(uid16, linux_getegid16, return, error); 326 return (error); 327 } 328 329 int 330 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 331 { 332 struct geteuid_args bsd; 333 int error; 334 335 LIN_SDT_PROBE0(uid16, linux_geteuid16, entry); 336 337 error = sys_geteuid(td, &bsd); 338 339 LIN_SDT_PROBE1(uid16, linux_geteuid16, return, error); 340 return (error); 341 } 342 343 int 344 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 345 { 346 struct setgid_args bsd; 347 int error; 348 349 LIN_SDT_PROBE1(uid16, linux_setgid16, entry, args->gid); 350 351 bsd.gid = args->gid; 352 error = sys_setgid(td, &bsd); 353 354 LIN_SDT_PROBE1(uid16, linux_setgid16, return, error); 355 return (error); 356 } 357 358 int 359 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 360 { 361 struct setuid_args bsd; 362 int error; 363 364 LIN_SDT_PROBE1(uid16, linux_setuid16, entry, args->uid); 365 366 bsd.uid = args->uid; 367 error = sys_setuid(td, &bsd); 368 369 LIN_SDT_PROBE1(uid16, linux_setuid16, return, error); 370 return (error); 371 } 372 373 int 374 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 375 { 376 struct setregid_args bsd; 377 int error; 378 379 LIN_SDT_PROBE2(uid16, linux_setregid16, entry, args->rgid, args->egid); 380 381 bsd.rgid = CAST_NOCHG(args->rgid); 382 bsd.egid = CAST_NOCHG(args->egid); 383 error = sys_setregid(td, &bsd); 384 385 LIN_SDT_PROBE1(uid16, linux_setregid16, return, error); 386 return (error); 387 } 388 389 int 390 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 391 { 392 struct setreuid_args bsd; 393 int error; 394 395 LIN_SDT_PROBE2(uid16, linux_setreuid16, entry, args->ruid, args->euid); 396 397 bsd.ruid = CAST_NOCHG(args->ruid); 398 bsd.euid = CAST_NOCHG(args->euid); 399 error = sys_setreuid(td, &bsd); 400 401 LIN_SDT_PROBE1(uid16, linux_setreuid16, return, error); 402 return (error); 403 } 404 405 int 406 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 407 { 408 struct setresgid_args bsd; 409 int error; 410 411 LIN_SDT_PROBE3(uid16, linux_setresgid16, entry, args->rgid, args->egid, 412 args->sgid); 413 414 bsd.rgid = CAST_NOCHG(args->rgid); 415 bsd.egid = CAST_NOCHG(args->egid); 416 bsd.sgid = CAST_NOCHG(args->sgid); 417 error = sys_setresgid(td, &bsd); 418 419 LIN_SDT_PROBE1(uid16, linux_setresgid16, return, error); 420 return (error); 421 } 422 423 int 424 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 425 { 426 struct setresuid_args bsd; 427 int error; 428 429 LIN_SDT_PROBE3(uid16, linux_setresuid16, entry, args->ruid, args->euid, 430 args->suid); 431 432 bsd.ruid = CAST_NOCHG(args->ruid); 433 bsd.euid = CAST_NOCHG(args->euid); 434 bsd.suid = CAST_NOCHG(args->suid); 435 error = sys_setresuid(td, &bsd); 436 437 LIN_SDT_PROBE1(uid16, linux_setresuid16, return, error); 438 return (error); 439 }
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