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 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/lock.h> 31 #include <sys/malloc.h> 32 #include <sys/mutex.h> 33 #include <sys/proc.h> 34 #include <sys/syscallsubr.h> 35 #include <sys/sysproto.h> 36 #include <sys/systm.h> 37 38 #include <machine/../linux/linux.h> 39 #include <machine/../linux/linux_proto.h> 40 41 #include <compat/linux/linux_util.h> 42 43 DUMMY(setfsuid16); 44 DUMMY(setfsgid16); 45 DUMMY(getresuid16); 46 DUMMY(getresgid16); 47 48 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x) 49 50 int 51 linux_chown16(struct thread *td, struct linux_chown16_args *args) 52 { 53 char *path; 54 int error; 55 56 LCONVPATHEXIST(td, args->path, &path); 57 58 #ifdef DEBUG 59 if (ldebug(chown16)) 60 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid); 61 #endif 62 error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 63 CAST_NOCHG(args->gid)); 64 LFREEPATH(path); 65 return (error); 66 } 67 68 int 69 linux_lchown16(struct thread *td, struct linux_lchown16_args *args) 70 { 71 char *path; 72 int error; 73 74 LCONVPATHEXIST(td, args->path, &path); 75 76 #ifdef DEBUG 77 if (ldebug(lchown16)) 78 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid, 79 args->gid); 80 #endif 81 error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 82 CAST_NOCHG(args->gid)); 83 LFREEPATH(path); 84 return (error); 85 } 86 87 int 88 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args) 89 { 90 struct ucred *newcred, *oldcred; 91 l_gid16_t linux_gidset[NGROUPS]; 92 gid_t *bsd_gidset; 93 int ngrp, error; 94 struct proc *p; 95 96 #ifdef DEBUG 97 if (ldebug(setgroups16)) 98 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize); 99 #endif 100 101 ngrp = args->gidsetsize; 102 if (ngrp >= NGROUPS) 103 return (EINVAL); 104 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 105 if (error) 106 return (error); 107 newcred = crget(); 108 p = td->td_proc; 109 PROC_LOCK(p); 110 oldcred = p->p_ucred; 111 112 /* 113 * cr_groups[0] holds egid. Setting the whole set from 114 * the supplied set will cause egid to be changed too. 115 * Keep cr_groups[0] unchanged to prevent that. 116 */ 117 118 if ((error = suser_cred(oldcred, PRISON_ROOT)) != 0) { 119 PROC_UNLOCK(p); 120 crfree(newcred); 121 return (error); 122 } 123 124 crcopy(newcred, oldcred); 125 if (ngrp > 0) { 126 newcred->cr_ngroups = ngrp + 1; 127 128 bsd_gidset = newcred->cr_groups; 129 ngrp--; 130 while (ngrp >= 0) { 131 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 132 ngrp--; 133 } 134 } 135 else 136 newcred->cr_ngroups = 1; 137 138 setsugid(td->td_proc); 139 p->p_ucred = newcred; 140 PROC_UNLOCK(p); 141 crfree(oldcred); 142 return (0); 143 } 144 145 int 146 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 147 { 148 struct ucred *cred; 149 l_gid16_t linux_gidset[NGROUPS]; 150 gid_t *bsd_gidset; 151 int bsd_gidsetsz, ngrp, error; 152 153 #ifdef DEBUG 154 if (ldebug(getgroups16)) 155 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize); 156 #endif 157 158 cred = td->td_ucred; 159 bsd_gidset = cred->cr_groups; 160 bsd_gidsetsz = cred->cr_ngroups - 1; 161 162 /* 163 * cr_groups[0] holds egid. Returning the whole set 164 * here will cause a duplicate. Exclude cr_groups[0] 165 * to prevent that. 166 */ 167 168 if ((ngrp = args->gidsetsize) == 0) { 169 td->td_retval[0] = bsd_gidsetsz; 170 return (0); 171 } 172 173 if (ngrp < bsd_gidsetsz) 174 return (EINVAL); 175 176 ngrp = 0; 177 while (ngrp < bsd_gidsetsz) { 178 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 179 ngrp++; 180 } 181 182 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 183 if (error) 184 return (error); 185 186 td->td_retval[0] = ngrp; 187 return (0); 188 } 189 190 /* 191 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1] 192 * when COMPAT_43 or COMPAT_SUNOS is defined. This globbers registers that 193 * are assumed to be preserved. The following lightweight syscalls fixes 194 * this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in 195 * linux_misc.c 196 * 197 * linux_getgid16() - MP SAFE 198 * linux_getuid16() - MP SAFE 199 */ 200 201 int 202 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 203 { 204 205 td->td_retval[0] = td->td_ucred->cr_rgid; 206 return (0); 207 } 208 209 int 210 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 211 { 212 213 td->td_retval[0] = td->td_ucred->cr_ruid; 214 return (0); 215 } 216 217 int 218 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 219 { 220 struct getegid_args bsd; 221 222 return (getegid(td, &bsd)); 223 } 224 225 int 226 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 227 { 228 struct geteuid_args bsd; 229 230 return (geteuid(td, &bsd)); 231 } 232 233 int 234 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 235 { 236 struct setgid_args bsd; 237 238 bsd.gid = args->gid; 239 return (setgid(td, &bsd)); 240 } 241 242 int 243 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 244 { 245 struct setuid_args bsd; 246 247 bsd.uid = args->uid; 248 return (setuid(td, &bsd)); 249 } 250 251 int 252 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 253 { 254 struct setregid_args bsd; 255 256 bsd.rgid = CAST_NOCHG(args->rgid); 257 bsd.egid = CAST_NOCHG(args->egid); 258 return (setregid(td, &bsd)); 259 } 260 261 int 262 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 263 { 264 struct setreuid_args bsd; 265 266 bsd.ruid = CAST_NOCHG(args->ruid); 267 bsd.euid = CAST_NOCHG(args->euid); 268 return (setreuid(td, &bsd)); 269 } 270 271 int 272 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 273 { 274 struct setresgid_args bsd; 275 276 bsd.rgid = CAST_NOCHG(args->rgid); 277 bsd.egid = CAST_NOCHG(args->egid); 278 bsd.sgid = CAST_NOCHG(args->sgid); 279 return (setresgid(td, &bsd)); 280 } 281 282 int 283 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 284 { 285 struct setresuid_args bsd; 286 287 bsd.ruid = CAST_NOCHG(args->ruid); 288 bsd.euid = CAST_NOCHG(args->euid); 289 bsd.suid = CAST_NOCHG(args->suid); 290 return (setresuid(td, &bsd)); 291 } 292