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 free(linux_gidset, M_TEMP); 118 return (error); 119 } 120 newcred = crget(); 121 p = td->td_proc; 122 PROC_LOCK(p); 123 oldcred = crcopysafe(p, newcred); 124 125 /* 126 * cr_groups[0] holds egid. Setting the whole set from 127 * the supplied set will cause egid to be changed too. 128 * Keep cr_groups[0] unchanged to prevent that. 129 */ 130 131 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) { 132 PROC_UNLOCK(p); 133 crfree(newcred); 134 goto out; 135 } 136 137 if (ngrp > 0) { 138 newcred->cr_ngroups = ngrp + 1; 139 140 bsd_gidset = newcred->cr_groups; 141 ngrp--; 142 while (ngrp >= 0) { 143 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 144 ngrp--; 145 } 146 } 147 else 148 newcred->cr_ngroups = 1; 149 150 setsugid(td->td_proc); 151 p->p_ucred = newcred; 152 PROC_UNLOCK(p); 153 crfree(oldcred); 154 error = 0; 155 out: 156 free(linux_gidset, M_TEMP); 157 return (error); 158 } 159 160 int 161 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 162 { 163 struct ucred *cred; 164 l_gid16_t *linux_gidset; 165 gid_t *bsd_gidset; 166 int bsd_gidsetsz, ngrp, error; 167 168 #ifdef DEBUG 169 if (ldebug(getgroups16)) 170 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize); 171 #endif 172 173 cred = td->td_ucred; 174 bsd_gidset = cred->cr_groups; 175 bsd_gidsetsz = cred->cr_ngroups - 1; 176 177 /* 178 * cr_groups[0] holds egid. Returning the whole set 179 * here will cause a duplicate. Exclude cr_groups[0] 180 * to prevent that. 181 */ 182 183 if ((ngrp = args->gidsetsize) == 0) { 184 td->td_retval[0] = bsd_gidsetsz; 185 return (0); 186 } 187 188 if (ngrp < bsd_gidsetsz) 189 return (EINVAL); 190 191 ngrp = 0; 192 linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset), 193 M_TEMP, M_WAITOK); 194 while (ngrp < bsd_gidsetsz) { 195 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 196 ngrp++; 197 } 198 199 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 200 free(linux_gidset, M_TEMP); 201 if (error) 202 return (error); 203 204 td->td_retval[0] = ngrp; 205 return (0); 206 } 207 208 /* 209 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1] 210 * when COMPAT_43 is defined. This clobbers registers that are assumed to 211 * be preserved. The following lightweight syscalls fixes this. See also 212 * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c 213 * 214 * linux_getgid16() - MP SAFE 215 * linux_getuid16() - MP SAFE 216 */ 217 218 int 219 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 220 { 221 222 td->td_retval[0] = td->td_ucred->cr_rgid; 223 return (0); 224 } 225 226 int 227 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 228 { 229 230 td->td_retval[0] = td->td_ucred->cr_ruid; 231 return (0); 232 } 233 234 int 235 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 236 { 237 struct getegid_args bsd; 238 239 return (sys_getegid(td, &bsd)); 240 } 241 242 int 243 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 244 { 245 struct geteuid_args bsd; 246 247 return (sys_geteuid(td, &bsd)); 248 } 249 250 int 251 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 252 { 253 struct setgid_args bsd; 254 255 bsd.gid = args->gid; 256 return (sys_setgid(td, &bsd)); 257 } 258 259 int 260 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 261 { 262 struct setuid_args bsd; 263 264 bsd.uid = args->uid; 265 return (sys_setuid(td, &bsd)); 266 } 267 268 int 269 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 270 { 271 struct setregid_args bsd; 272 273 bsd.rgid = CAST_NOCHG(args->rgid); 274 bsd.egid = CAST_NOCHG(args->egid); 275 return (sys_setregid(td, &bsd)); 276 } 277 278 int 279 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 280 { 281 struct setreuid_args bsd; 282 283 bsd.ruid = CAST_NOCHG(args->ruid); 284 bsd.euid = CAST_NOCHG(args->euid); 285 return (sys_setreuid(td, &bsd)); 286 } 287 288 int 289 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 290 { 291 struct setresgid_args bsd; 292 293 bsd.rgid = CAST_NOCHG(args->rgid); 294 bsd.egid = CAST_NOCHG(args->egid); 295 bsd.sgid = CAST_NOCHG(args->sgid); 296 return (sys_setresgid(td, &bsd)); 297 } 298 299 int 300 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 301 { 302 struct setresuid_args bsd; 303 304 bsd.ruid = CAST_NOCHG(args->ruid); 305 bsd.euid = CAST_NOCHG(args->euid); 306 bsd.suid = CAST_NOCHG(args->suid); 307 return (sys_setresuid(td, &bsd)); 308 } 309