1 /*- 2 * Copyright (c) 2001 The FreeBSD Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_compat.h" 31 32 #include <sys/fcntl.h> 33 #include <sys/param.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/mutex.h> 37 #include <sys/priv.h> 38 #include <sys/proc.h> 39 #include <sys/syscallsubr.h> 40 #include <sys/sysproto.h> 41 #include <sys/systm.h> 42 43 #ifdef COMPAT_LINUX32 44 #include <machine/../linux32/linux.h> 45 #include <machine/../linux32/linux32_proto.h> 46 #else 47 #include <machine/../linux/linux.h> 48 #include <machine/../linux/linux_proto.h> 49 #endif 50 51 #include <compat/linux/linux_util.h> 52 53 DUMMY(setfsuid16); 54 DUMMY(setfsgid16); 55 DUMMY(getresuid16); 56 DUMMY(getresgid16); 57 58 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x) 59 60 int 61 linux_chown16(struct thread *td, struct linux_chown16_args *args) 62 { 63 char *path; 64 int error; 65 66 LCONVPATHEXIST(td, args->path, &path); 67 68 #ifdef DEBUG 69 if (ldebug(chown16)) 70 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid); 71 #endif 72 error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 73 CAST_NOCHG(args->gid)); 74 LFREEPATH(path); 75 return (error); 76 } 77 78 int 79 linux_lchown16(struct thread *td, struct linux_lchown16_args *args) 80 { 81 char *path; 82 int error; 83 84 LCONVPATHEXIST(td, args->path, &path); 85 86 #ifdef DEBUG 87 if (ldebug(lchown16)) 88 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid, 89 args->gid); 90 #endif 91 error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 92 CAST_NOCHG(args->gid)); 93 LFREEPATH(path); 94 return (error); 95 } 96 97 int 98 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args) 99 { 100 struct ucred *newcred, *oldcred; 101 l_gid16_t *linux_gidset; 102 gid_t *bsd_gidset; 103 int ngrp, error; 104 struct proc *p; 105 106 #ifdef DEBUG 107 if (ldebug(setgroups16)) 108 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize); 109 #endif 110 111 ngrp = args->gidsetsize; 112 if (ngrp < 0 || ngrp >= ngroups_max + 1) 113 return (EINVAL); 114 linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK); 115 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 116 if (error) 117 return (error); 118 newcred = crget(); 119 p = td->td_proc; 120 PROC_LOCK(p); 121 oldcred = crcopysafe(p, newcred); 122 123 /* 124 * cr_groups[0] holds egid. Setting the whole set from 125 * the supplied set will cause egid to be changed too. 126 * Keep cr_groups[0] unchanged to prevent that. 127 */ 128 129 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) { 130 PROC_UNLOCK(p); 131 crfree(newcred); 132 goto out; 133 } 134 135 if (ngrp > 0) { 136 newcred->cr_ngroups = ngrp + 1; 137 138 bsd_gidset = newcred->cr_groups; 139 ngrp--; 140 while (ngrp >= 0) { 141 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 142 ngrp--; 143 } 144 } 145 else 146 newcred->cr_ngroups = 1; 147 148 setsugid(td->td_proc); 149 p->p_ucred = newcred; 150 PROC_UNLOCK(p); 151 crfree(oldcred); 152 error = 0; 153 out: 154 free(linux_gidset, M_TEMP); 155 return (error); 156 } 157 158 int 159 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 160 { 161 struct ucred *cred; 162 l_gid16_t *linux_gidset; 163 gid_t *bsd_gidset; 164 int bsd_gidsetsz, ngrp, error; 165 166 #ifdef DEBUG 167 if (ldebug(getgroups16)) 168 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize); 169 #endif 170 171 cred = td->td_ucred; 172 bsd_gidset = cred->cr_groups; 173 bsd_gidsetsz = cred->cr_ngroups - 1; 174 175 /* 176 * cr_groups[0] holds egid. Returning the whole set 177 * here will cause a duplicate. Exclude cr_groups[0] 178 * to prevent that. 179 */ 180 181 if ((ngrp = args->gidsetsize) == 0) { 182 td->td_retval[0] = bsd_gidsetsz; 183 return (0); 184 } 185 186 if (ngrp < bsd_gidsetsz) 187 return (EINVAL); 188 189 ngrp = 0; 190 linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset), 191 M_TEMP, M_WAITOK); 192 while (ngrp < bsd_gidsetsz) { 193 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 194 ngrp++; 195 } 196 197 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 198 free(linux_gidset, M_TEMP); 199 if (error) 200 return (error); 201 202 td->td_retval[0] = ngrp; 203 return (0); 204 } 205 206 /* 207 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1] 208 * when COMPAT_43 is defined. This clobbers registers that are assumed to 209 * be preserved. The following lightweight syscalls fixes this. See also 210 * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c 211 * 212 * linux_getgid16() - MP SAFE 213 * linux_getuid16() - MP SAFE 214 */ 215 216 int 217 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 218 { 219 220 td->td_retval[0] = td->td_ucred->cr_rgid; 221 return (0); 222 } 223 224 int 225 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 226 { 227 228 td->td_retval[0] = td->td_ucred->cr_ruid; 229 return (0); 230 } 231 232 int 233 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 234 { 235 struct getegid_args bsd; 236 237 return (getegid(td, &bsd)); 238 } 239 240 int 241 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 242 { 243 struct geteuid_args bsd; 244 245 return (geteuid(td, &bsd)); 246 } 247 248 int 249 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 250 { 251 struct setgid_args bsd; 252 253 bsd.gid = args->gid; 254 return (setgid(td, &bsd)); 255 } 256 257 int 258 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 259 { 260 struct setuid_args bsd; 261 262 bsd.uid = args->uid; 263 return (setuid(td, &bsd)); 264 } 265 266 int 267 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 268 { 269 struct setregid_args bsd; 270 271 bsd.rgid = CAST_NOCHG(args->rgid); 272 bsd.egid = CAST_NOCHG(args->egid); 273 return (setregid(td, &bsd)); 274 } 275 276 int 277 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 278 { 279 struct setreuid_args bsd; 280 281 bsd.ruid = CAST_NOCHG(args->ruid); 282 bsd.euid = CAST_NOCHG(args->euid); 283 return (setreuid(td, &bsd)); 284 } 285 286 int 287 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 288 { 289 struct setresgid_args bsd; 290 291 bsd.rgid = CAST_NOCHG(args->rgid); 292 bsd.egid = CAST_NOCHG(args->egid); 293 bsd.sgid = CAST_NOCHG(args->sgid); 294 return (setresgid(td, &bsd)); 295 } 296 297 int 298 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 299 { 300 struct setresuid_args bsd; 301 302 bsd.ruid = CAST_NOCHG(args->ruid); 303 bsd.euid = CAST_NOCHG(args->euid); 304 bsd.suid = CAST_NOCHG(args->suid); 305 return (setresuid(td, &bsd)); 306 } 307