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[NGROUPS]; 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) 113 return (EINVAL); 114 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 115 if (error) 116 return (error); 117 newcred = crget(); 118 p = td->td_proc; 119 PROC_LOCK(p); 120 oldcred = p->p_ucred; 121 122 /* 123 * cr_groups[0] holds egid. Setting the whole set from 124 * the supplied set will cause egid to be changed too. 125 * Keep cr_groups[0] unchanged to prevent that. 126 */ 127 128 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) { 129 PROC_UNLOCK(p); 130 crfree(newcred); 131 return (error); 132 } 133 134 crcopy(newcred, oldcred); 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 return (0); 153 } 154 155 int 156 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 157 { 158 struct ucred *cred; 159 l_gid16_t linux_gidset[NGROUPS]; 160 gid_t *bsd_gidset; 161 int bsd_gidsetsz, ngrp, error; 162 163 #ifdef DEBUG 164 if (ldebug(getgroups16)) 165 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize); 166 #endif 167 168 cred = td->td_ucred; 169 bsd_gidset = cred->cr_groups; 170 bsd_gidsetsz = cred->cr_ngroups - 1; 171 172 /* 173 * cr_groups[0] holds egid. Returning the whole set 174 * here will cause a duplicate. Exclude cr_groups[0] 175 * to prevent that. 176 */ 177 178 if ((ngrp = args->gidsetsize) == 0) { 179 td->td_retval[0] = bsd_gidsetsz; 180 return (0); 181 } 182 183 if (ngrp < bsd_gidsetsz) 184 return (EINVAL); 185 186 ngrp = 0; 187 while (ngrp < bsd_gidsetsz) { 188 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 189 ngrp++; 190 } 191 192 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 193 if (error) 194 return (error); 195 196 td->td_retval[0] = ngrp; 197 return (0); 198 } 199 200 /* 201 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1] 202 * when COMPAT_43 is defined. This clobbers registers that are assumed to 203 * be preserved. The following lightweight syscalls fixes this. See also 204 * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c 205 * 206 * linux_getgid16() - MP SAFE 207 * linux_getuid16() - MP SAFE 208 */ 209 210 int 211 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 212 { 213 214 td->td_retval[0] = td->td_ucred->cr_rgid; 215 return (0); 216 } 217 218 int 219 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 220 { 221 222 td->td_retval[0] = td->td_ucred->cr_ruid; 223 return (0); 224 } 225 226 int 227 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 228 { 229 struct getegid_args bsd; 230 231 return (getegid(td, &bsd)); 232 } 233 234 int 235 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 236 { 237 struct geteuid_args bsd; 238 239 return (geteuid(td, &bsd)); 240 } 241 242 int 243 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 244 { 245 struct setgid_args bsd; 246 247 bsd.gid = args->gid; 248 return (setgid(td, &bsd)); 249 } 250 251 int 252 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 253 { 254 struct setuid_args bsd; 255 256 bsd.uid = args->uid; 257 return (setuid(td, &bsd)); 258 } 259 260 int 261 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 262 { 263 struct setregid_args bsd; 264 265 bsd.rgid = CAST_NOCHG(args->rgid); 266 bsd.egid = CAST_NOCHG(args->egid); 267 return (setregid(td, &bsd)); 268 } 269 270 int 271 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 272 { 273 struct setreuid_args bsd; 274 275 bsd.ruid = CAST_NOCHG(args->ruid); 276 bsd.euid = CAST_NOCHG(args->euid); 277 return (setreuid(td, &bsd)); 278 } 279 280 int 281 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 282 { 283 struct setresgid_args bsd; 284 285 bsd.rgid = CAST_NOCHG(args->rgid); 286 bsd.egid = CAST_NOCHG(args->egid); 287 bsd.sgid = CAST_NOCHG(args->sgid); 288 return (setresgid(td, &bsd)); 289 } 290 291 int 292 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 293 { 294 struct setresuid_args bsd; 295 296 bsd.ruid = CAST_NOCHG(args->ruid); 297 bsd.euid = CAST_NOCHG(args->euid); 298 bsd.suid = CAST_NOCHG(args->suid); 299 return (setresuid(td, &bsd)); 300 } 301