1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/fcntl.h> 31 #include <sys/lock.h> 32 #include <sys/malloc.h> 33 #include <sys/mutex.h> 34 #include <sys/priv.h> 35 #include <sys/proc.h> 36 #include <sys/syscallsubr.h> 37 #include <sys/sysproto.h> 38 39 #ifdef COMPAT_LINUX32 40 #include <machine/../linux32/linux.h> 41 #include <machine/../linux32/linux32_proto.h> 42 #else 43 #include <machine/../linux/linux.h> 44 #include <machine/../linux/linux_proto.h> 45 #endif 46 47 #include <compat/linux/linux_dtrace.h> 48 #include <compat/linux/linux_util.h> 49 50 /* DTrace init */ 51 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 52 53 /** 54 * DTrace probes in this module. 55 */ 56 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, conv_path, "char *"); 57 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, conv_path, "char *"); 58 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, copyin_error, "int"); 59 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, priv_check_cred_error, "int"); 60 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, copyout_error, "int"); 61 62 DUMMY(setfsuid16); 63 DUMMY(setfsgid16); 64 DUMMY(getresuid16); 65 DUMMY(getresgid16); 66 67 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x) 68 69 int 70 linux_chown16(struct thread *td, struct linux_chown16_args *args) 71 { 72 73 return (kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE, 74 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0)); 75 } 76 77 int 78 linux_lchown16(struct thread *td, struct linux_lchown16_args *args) 79 { 80 81 return (kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE, 82 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW)); 83 } 84 85 int 86 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args) 87 { 88 struct ucred *newcred, *oldcred; 89 l_gid16_t *linux_gidset; 90 int ngrp, error; 91 struct proc *p; 92 93 ngrp = args->gidsetsize; 94 if (ngrp < 0 || ngrp >= ngroups_max) 95 return (EINVAL); 96 linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK); 97 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 98 if (error) { 99 LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error); 100 free(linux_gidset, M_LINUX); 101 return (error); 102 } 103 newcred = crget(); 104 p = td->td_proc; 105 PROC_LOCK(p); 106 oldcred = crcopysafe(p, newcred); 107 108 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS)) != 0) { 109 PROC_UNLOCK(p); 110 crfree(newcred); 111 112 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error, 113 error); 114 goto out; 115 } 116 117 newcred->cr_ngroups = ngrp; 118 for (int i = 0; i < ngrp; i++) 119 newcred->cr_groups[i] = linux_gidset[i]; 120 121 setsugid(td->td_proc); 122 proc_set_cred(p, newcred); 123 PROC_UNLOCK(p); 124 crfree(oldcred); 125 error = 0; 126 out: 127 free(linux_gidset, M_LINUX); 128 129 return (error); 130 } 131 132 int 133 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 134 { 135 struct ucred *cred; 136 l_gid16_t *linux_gidset; 137 gid_t *bsd_gidset; 138 int bsd_gidsetsz, ngrp, error; 139 140 cred = td->td_ucred; 141 bsd_gidset = cred->cr_groups; 142 bsd_gidsetsz = cred->cr_ngroups; 143 144 if ((ngrp = args->gidsetsize) == 0) { 145 td->td_retval[0] = bsd_gidsetsz; 146 return (0); 147 } 148 149 if (ngrp < bsd_gidsetsz) 150 return (EINVAL); 151 152 ngrp = 0; 153 linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset), 154 M_LINUX, M_WAITOK); 155 while (ngrp < bsd_gidsetsz) { 156 linux_gidset[ngrp] = bsd_gidset[ngrp]; 157 ngrp++; 158 } 159 160 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 161 free(linux_gidset, M_LINUX); 162 if (error) { 163 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error); 164 return (error); 165 } 166 167 td->td_retval[0] = ngrp; 168 169 return (0); 170 } 171 172 int 173 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 174 { 175 176 td->td_retval[0] = td->td_ucred->cr_rgid; 177 178 return (0); 179 } 180 181 int 182 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 183 { 184 185 td->td_retval[0] = td->td_ucred->cr_ruid; 186 187 return (0); 188 } 189 190 int 191 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 192 { 193 struct getegid_args bsd; 194 int error; 195 196 error = sys_getegid(td, &bsd); 197 198 return (error); 199 } 200 201 int 202 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 203 { 204 struct geteuid_args bsd; 205 int error; 206 207 error = sys_geteuid(td, &bsd); 208 209 return (error); 210 } 211 212 int 213 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 214 { 215 struct setgid_args bsd; 216 int error; 217 218 bsd.gid = args->gid; 219 error = sys_setgid(td, &bsd); 220 221 return (error); 222 } 223 224 int 225 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 226 { 227 struct setuid_args bsd; 228 int error; 229 230 bsd.uid = args->uid; 231 error = sys_setuid(td, &bsd); 232 233 return (error); 234 } 235 236 int 237 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 238 { 239 struct setregid_args bsd; 240 int error; 241 242 bsd.rgid = CAST_NOCHG(args->rgid); 243 bsd.egid = CAST_NOCHG(args->egid); 244 error = sys_setregid(td, &bsd); 245 246 return (error); 247 } 248 249 int 250 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 251 { 252 struct setreuid_args bsd; 253 int error; 254 255 bsd.ruid = CAST_NOCHG(args->ruid); 256 bsd.euid = CAST_NOCHG(args->euid); 257 error = sys_setreuid(td, &bsd); 258 259 return (error); 260 } 261 262 int 263 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 264 { 265 struct setresgid_args bsd; 266 int error; 267 268 bsd.rgid = CAST_NOCHG(args->rgid); 269 bsd.egid = CAST_NOCHG(args->egid); 270 bsd.sgid = CAST_NOCHG(args->sgid); 271 error = sys_setresgid(td, &bsd); 272 273 return (error); 274 } 275 276 int 277 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 278 { 279 struct setresuid_args bsd; 280 int error; 281 282 bsd.ruid = CAST_NOCHG(args->ruid); 283 bsd.euid = CAST_NOCHG(args->euid); 284 bsd.suid = CAST_NOCHG(args->suid); 285 error = sys_setresuid(td, &bsd); 286 287 return (error); 288 } 289