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 LCONVPATHEXIST(td, args->path, &path); 116 117 /* 118 * The DTrace probes have to be after the LCONVPATHEXIST, as 119 * LCONVPATHEXIST may return on its own and we do not want to 120 * have a stray entry without the corresponding return. 121 */ 122 LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid, 123 args->gid); 124 LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path); 125 126 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, 127 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0); 128 LFREEPATH(path); 129 130 LIN_SDT_PROBE1(uid16, linux_chown16, return, error); 131 return (error); 132 } 133 134 int 135 linux_lchown16(struct thread *td, struct linux_lchown16_args *args) 136 { 137 char *path; 138 int error; 139 140 LCONVPATHEXIST(td, args->path, &path); 141 142 /* 143 * The DTrace probes have to be after the LCONVPATHEXIST, as 144 * LCONVPATHEXIST may return on its own and we do not want to 145 * have a stray entry without the corresponding return. 146 */ 147 LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid, 148 args->gid); 149 LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path); 150 151 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, 152 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW); 153 LFREEPATH(path); 154 155 LIN_SDT_PROBE1(uid16, linux_lchown16, return, error); 156 return (error); 157 } 158 159 int 160 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args) 161 { 162 struct ucred *newcred, *oldcred; 163 l_gid16_t *linux_gidset; 164 gid_t *bsd_gidset; 165 int ngrp, error; 166 struct proc *p; 167 168 LIN_SDT_PROBE2(uid16, linux_setgroups16, entry, args->gidsetsize, 169 args->gidset); 170 171 ngrp = args->gidsetsize; 172 if (ngrp < 0 || ngrp >= ngroups_max + 1) { 173 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, EINVAL); 174 return (EINVAL); 175 } 176 linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK); 177 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 178 if (error) { 179 LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error); 180 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error); 181 free(linux_gidset, M_LINUX); 182 return (error); 183 } 184 newcred = crget(); 185 p = td->td_proc; 186 PROC_LOCK(p); 187 oldcred = crcopysafe(p, newcred); 188 189 /* 190 * cr_groups[0] holds egid. Setting the whole set from 191 * the supplied set will cause egid to be changed too. 192 * Keep cr_groups[0] unchanged to prevent that. 193 */ 194 195 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS)) != 0) { 196 PROC_UNLOCK(p); 197 crfree(newcred); 198 199 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error, 200 error); 201 goto out; 202 } 203 204 if (ngrp > 0) { 205 newcred->cr_ngroups = ngrp + 1; 206 207 bsd_gidset = newcred->cr_groups; 208 ngrp--; 209 while (ngrp >= 0) { 210 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 211 ngrp--; 212 } 213 } 214 else 215 newcred->cr_ngroups = 1; 216 217 setsugid(td->td_proc); 218 proc_set_cred(p, newcred); 219 PROC_UNLOCK(p); 220 crfree(oldcred); 221 error = 0; 222 out: 223 free(linux_gidset, M_LINUX); 224 225 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error); 226 return (error); 227 } 228 229 int 230 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 231 { 232 struct ucred *cred; 233 l_gid16_t *linux_gidset; 234 gid_t *bsd_gidset; 235 int bsd_gidsetsz, ngrp, error; 236 237 LIN_SDT_PROBE2(uid16, linux_getgroups16, entry, args->gidsetsize, 238 args->gidset); 239 240 cred = td->td_ucred; 241 bsd_gidset = cred->cr_groups; 242 bsd_gidsetsz = cred->cr_ngroups - 1; 243 244 /* 245 * cr_groups[0] holds egid. Returning the whole set 246 * here will cause a duplicate. Exclude cr_groups[0] 247 * to prevent that. 248 */ 249 250 if ((ngrp = args->gidsetsize) == 0) { 251 td->td_retval[0] = bsd_gidsetsz; 252 253 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0); 254 return (0); 255 } 256 257 if (ngrp < bsd_gidsetsz) { 258 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, EINVAL); 259 return (EINVAL); 260 } 261 262 ngrp = 0; 263 linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset), 264 M_LINUX, M_WAITOK); 265 while (ngrp < bsd_gidsetsz) { 266 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 267 ngrp++; 268 } 269 270 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 271 free(linux_gidset, M_LINUX); 272 if (error) { 273 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error); 274 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, error); 275 return (error); 276 } 277 278 td->td_retval[0] = ngrp; 279 280 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0); 281 return (0); 282 } 283 284 /* 285 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1] 286 * when COMPAT_43 is defined. This clobbers registers that are assumed to 287 * be preserved. The following lightweight syscalls fixes this. See also 288 * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c 289 * 290 * linux_getgid16() - MP SAFE 291 * linux_getuid16() - MP SAFE 292 */ 293 294 int 295 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 296 { 297 298 LIN_SDT_PROBE0(uid16, linux_getgid16, entry); 299 300 td->td_retval[0] = td->td_ucred->cr_rgid; 301 302 LIN_SDT_PROBE1(uid16, linux_getgid16, return, 0); 303 return (0); 304 } 305 306 int 307 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 308 { 309 310 LIN_SDT_PROBE0(uid16, linux_getuid16, entry); 311 312 td->td_retval[0] = td->td_ucred->cr_ruid; 313 314 LIN_SDT_PROBE1(uid16, linux_getuid16, return, 0); 315 return (0); 316 } 317 318 int 319 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 320 { 321 struct getegid_args bsd; 322 int error; 323 324 LIN_SDT_PROBE0(uid16, linux_getegid16, entry); 325 326 error = sys_getegid(td, &bsd); 327 328 LIN_SDT_PROBE1(uid16, linux_getegid16, return, error); 329 return (error); 330 } 331 332 int 333 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 334 { 335 struct geteuid_args bsd; 336 int error; 337 338 LIN_SDT_PROBE0(uid16, linux_geteuid16, entry); 339 340 error = sys_geteuid(td, &bsd); 341 342 LIN_SDT_PROBE1(uid16, linux_geteuid16, return, error); 343 return (error); 344 } 345 346 int 347 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 348 { 349 struct setgid_args bsd; 350 int error; 351 352 LIN_SDT_PROBE1(uid16, linux_setgid16, entry, args->gid); 353 354 bsd.gid = args->gid; 355 error = sys_setgid(td, &bsd); 356 357 LIN_SDT_PROBE1(uid16, linux_setgid16, return, error); 358 return (error); 359 } 360 361 int 362 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 363 { 364 struct setuid_args bsd; 365 int error; 366 367 LIN_SDT_PROBE1(uid16, linux_setuid16, entry, args->uid); 368 369 bsd.uid = args->uid; 370 error = sys_setuid(td, &bsd); 371 372 LIN_SDT_PROBE1(uid16, linux_setuid16, return, error); 373 return (error); 374 } 375 376 int 377 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 378 { 379 struct setregid_args bsd; 380 int error; 381 382 LIN_SDT_PROBE2(uid16, linux_setregid16, entry, args->rgid, args->egid); 383 384 bsd.rgid = CAST_NOCHG(args->rgid); 385 bsd.egid = CAST_NOCHG(args->egid); 386 error = sys_setregid(td, &bsd); 387 388 LIN_SDT_PROBE1(uid16, linux_setregid16, return, error); 389 return (error); 390 } 391 392 int 393 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 394 { 395 struct setreuid_args bsd; 396 int error; 397 398 LIN_SDT_PROBE2(uid16, linux_setreuid16, entry, args->ruid, args->euid); 399 400 bsd.ruid = CAST_NOCHG(args->ruid); 401 bsd.euid = CAST_NOCHG(args->euid); 402 error = sys_setreuid(td, &bsd); 403 404 LIN_SDT_PROBE1(uid16, linux_setreuid16, return, error); 405 return (error); 406 } 407 408 int 409 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 410 { 411 struct setresgid_args bsd; 412 int error; 413 414 LIN_SDT_PROBE3(uid16, linux_setresgid16, entry, args->rgid, args->egid, 415 args->sgid); 416 417 bsd.rgid = CAST_NOCHG(args->rgid); 418 bsd.egid = CAST_NOCHG(args->egid); 419 bsd.sgid = CAST_NOCHG(args->sgid); 420 error = sys_setresgid(td, &bsd); 421 422 LIN_SDT_PROBE1(uid16, linux_setresgid16, return, error); 423 return (error); 424 } 425 426 int 427 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 428 { 429 struct setresuid_args bsd; 430 int error; 431 432 LIN_SDT_PROBE3(uid16, linux_setresuid16, entry, args->ruid, args->euid, 433 args->suid); 434 435 bsd.ruid = CAST_NOCHG(args->ruid); 436 bsd.euid = CAST_NOCHG(args->euid); 437 bsd.suid = CAST_NOCHG(args->suid); 438 error = sys_setresuid(td, &bsd); 439 440 LIN_SDT_PROBE1(uid16, linux_setresuid16, return, error); 441 return (error); 442 } 443