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 const int ngrp = args->gidsetsize; 89 struct ucred *newcred, *oldcred; 90 l_gid16_t *linux_gidset; 91 int error; 92 struct proc *p; 93 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 } 103 104 newcred = crget(); 105 crextend(newcred, ngrp); 106 p = td->td_proc; 107 PROC_LOCK(p); 108 oldcred = crcopysafe(p, newcred); 109 110 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS)) != 0) { 111 PROC_UNLOCK(p); 112 crfree(newcred); 113 114 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error, 115 error); 116 goto out; 117 } 118 119 newcred->cr_ngroups = ngrp; 120 for (int i = 0; i < ngrp; i++) 121 newcred->cr_groups[i] = linux_gidset[i]; 122 newcred->cr_flags |= CRED_FLAG_GROUPSET; 123 124 setsugid(td->td_proc); 125 proc_set_cred(p, newcred); 126 PROC_UNLOCK(p); 127 crfree(oldcred); 128 error = 0; 129 out: 130 free(linux_gidset, M_LINUX); 131 132 return (error); 133 } 134 135 int 136 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 137 { 138 const struct ucred *const cred = td->td_ucred; 139 l_gid16_t *linux_gidset; 140 int ngrp, error; 141 142 ngrp = args->gidsetsize; 143 144 if (ngrp == 0) { 145 td->td_retval[0] = cred->cr_ngroups; 146 return (0); 147 } 148 if (ngrp < cred->cr_ngroups) 149 return (EINVAL); 150 151 ngrp = cred->cr_ngroups; 152 153 linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK); 154 for (int i = 0; i < ngrp; ++i) 155 linux_gidset[i] = cred->cr_groups[i]; 156 157 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 158 free(linux_gidset, M_LINUX); 159 160 if (error != 0) { 161 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error); 162 return (error); 163 } 164 165 td->td_retval[0] = ngrp; 166 167 return (0); 168 } 169 170 int 171 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 172 { 173 174 td->td_retval[0] = td->td_ucred->cr_rgid; 175 176 return (0); 177 } 178 179 int 180 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 181 { 182 183 td->td_retval[0] = td->td_ucred->cr_ruid; 184 185 return (0); 186 } 187 188 int 189 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 190 { 191 struct getegid_args bsd; 192 int error; 193 194 error = sys_getegid(td, &bsd); 195 196 return (error); 197 } 198 199 int 200 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 201 { 202 struct geteuid_args bsd; 203 int error; 204 205 error = sys_geteuid(td, &bsd); 206 207 return (error); 208 } 209 210 int 211 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 212 { 213 struct setgid_args bsd; 214 int error; 215 216 bsd.gid = args->gid; 217 error = sys_setgid(td, &bsd); 218 219 return (error); 220 } 221 222 int 223 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 224 { 225 struct setuid_args bsd; 226 int error; 227 228 bsd.uid = args->uid; 229 error = sys_setuid(td, &bsd); 230 231 return (error); 232 } 233 234 int 235 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 236 { 237 struct setregid_args bsd; 238 int error; 239 240 bsd.rgid = CAST_NOCHG(args->rgid); 241 bsd.egid = CAST_NOCHG(args->egid); 242 error = sys_setregid(td, &bsd); 243 244 return (error); 245 } 246 247 int 248 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 249 { 250 struct setreuid_args bsd; 251 int error; 252 253 bsd.ruid = CAST_NOCHG(args->ruid); 254 bsd.euid = CAST_NOCHG(args->euid); 255 error = sys_setreuid(td, &bsd); 256 257 return (error); 258 } 259 260 int 261 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 262 { 263 struct setresgid_args bsd; 264 int error; 265 266 bsd.rgid = CAST_NOCHG(args->rgid); 267 bsd.egid = CAST_NOCHG(args->egid); 268 bsd.sgid = CAST_NOCHG(args->sgid); 269 error = sys_setresgid(td, &bsd); 270 271 return (error); 272 } 273 274 int 275 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 276 { 277 struct setresuid_args bsd; 278 int error; 279 280 bsd.ruid = CAST_NOCHG(args->ruid); 281 bsd.euid = CAST_NOCHG(args->euid); 282 bsd.suid = CAST_NOCHG(args->suid); 283 error = sys_setresuid(td, &bsd); 284 285 return (error); 286 } 287