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 <sys/param.h> 31 #include <sys/lock.h> 32 #include <sys/malloc.h> 33 #include <sys/mutex.h> 34 #include <sys/proc.h> 35 #include <sys/syscallsubr.h> 36 #include <sys/sysproto.h> 37 #include <sys/systm.h> 38 39 #include <machine/../linux/linux.h> 40 #include <machine/../linux/linux_proto.h> 41 42 #include <compat/linux/linux_util.h> 43 44 DUMMY(setfsuid16); 45 DUMMY(setfsgid16); 46 DUMMY(getresuid16); 47 DUMMY(getresgid16); 48 49 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x) 50 51 int 52 linux_chown16(struct thread *td, struct linux_chown16_args *args) 53 { 54 char *path; 55 int error; 56 57 LCONVPATHEXIST(td, args->path, &path); 58 59 #ifdef DEBUG 60 if (ldebug(chown16)) 61 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid); 62 #endif 63 error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 64 CAST_NOCHG(args->gid)); 65 LFREEPATH(path); 66 return (error); 67 } 68 69 int 70 linux_lchown16(struct thread *td, struct linux_lchown16_args *args) 71 { 72 char *path; 73 int error; 74 75 LCONVPATHEXIST(td, args->path, &path); 76 77 #ifdef DEBUG 78 if (ldebug(lchown16)) 79 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid, 80 args->gid); 81 #endif 82 error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 83 CAST_NOCHG(args->gid)); 84 LFREEPATH(path); 85 return (error); 86 } 87 88 int 89 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args) 90 { 91 struct ucred *newcred, *oldcred; 92 l_gid16_t linux_gidset[NGROUPS]; 93 gid_t *bsd_gidset; 94 int ngrp, error; 95 struct proc *p; 96 97 #ifdef DEBUG 98 if (ldebug(setgroups16)) 99 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize); 100 #endif 101 102 ngrp = args->gidsetsize; 103 if (ngrp < 0 || ngrp >= NGROUPS) 104 return (EINVAL); 105 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 106 if (error) 107 return (error); 108 newcred = crget(); 109 p = td->td_proc; 110 PROC_LOCK(p); 111 oldcred = p->p_ucred; 112 113 /* 114 * cr_groups[0] holds egid. Setting the whole set from 115 * the supplied set will cause egid to be changed too. 116 * Keep cr_groups[0] unchanged to prevent that. 117 */ 118 119 if ((error = suser_cred(oldcred, SUSER_ALLOWJAIL)) != 0) { 120 PROC_UNLOCK(p); 121 crfree(newcred); 122 return (error); 123 } 124 125 crcopy(newcred, oldcred); 126 if (ngrp > 0) { 127 newcred->cr_ngroups = ngrp + 1; 128 129 bsd_gidset = newcred->cr_groups; 130 ngrp--; 131 while (ngrp >= 0) { 132 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 133 ngrp--; 134 } 135 } 136 else 137 newcred->cr_ngroups = 1; 138 139 setsugid(td->td_proc); 140 p->p_ucred = newcred; 141 PROC_UNLOCK(p); 142 crfree(oldcred); 143 return (0); 144 } 145 146 int 147 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 148 { 149 struct ucred *cred; 150 l_gid16_t linux_gidset[NGROUPS]; 151 gid_t *bsd_gidset; 152 int bsd_gidsetsz, ngrp, error; 153 154 #ifdef DEBUG 155 if (ldebug(getgroups16)) 156 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize); 157 #endif 158 159 cred = td->td_ucred; 160 bsd_gidset = cred->cr_groups; 161 bsd_gidsetsz = cred->cr_ngroups - 1; 162 163 /* 164 * cr_groups[0] holds egid. Returning the whole set 165 * here will cause a duplicate. Exclude cr_groups[0] 166 * to prevent that. 167 */ 168 169 if ((ngrp = args->gidsetsize) == 0) { 170 td->td_retval[0] = bsd_gidsetsz; 171 return (0); 172 } 173 174 if (ngrp < bsd_gidsetsz) 175 return (EINVAL); 176 177 ngrp = 0; 178 while (ngrp < bsd_gidsetsz) { 179 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 180 ngrp++; 181 } 182 183 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 184 if (error) 185 return (error); 186 187 td->td_retval[0] = ngrp; 188 return (0); 189 } 190 191 /* 192 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1] 193 * when COMPAT_43 is defined. This globbers registers that 194 * are assumed to be preserved. The following lightweight syscalls fixes 195 * this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in 196 * linux_misc.c 197 * 198 * linux_getgid16() - MP SAFE 199 * linux_getuid16() - MP SAFE 200 */ 201 202 int 203 linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 204 { 205 206 td->td_retval[0] = td->td_ucred->cr_rgid; 207 return (0); 208 } 209 210 int 211 linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 212 { 213 214 td->td_retval[0] = td->td_ucred->cr_ruid; 215 return (0); 216 } 217 218 int 219 linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 220 { 221 struct getegid_args bsd; 222 223 return (getegid(td, &bsd)); 224 } 225 226 int 227 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 228 { 229 struct geteuid_args bsd; 230 231 return (geteuid(td, &bsd)); 232 } 233 234 int 235 linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 236 { 237 struct setgid_args bsd; 238 239 bsd.gid = args->gid; 240 return (setgid(td, &bsd)); 241 } 242 243 int 244 linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 245 { 246 struct setuid_args bsd; 247 248 bsd.uid = args->uid; 249 return (setuid(td, &bsd)); 250 } 251 252 int 253 linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 254 { 255 struct setregid_args bsd; 256 257 bsd.rgid = CAST_NOCHG(args->rgid); 258 bsd.egid = CAST_NOCHG(args->egid); 259 return (setregid(td, &bsd)); 260 } 261 262 int 263 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 264 { 265 struct setreuid_args bsd; 266 267 bsd.ruid = CAST_NOCHG(args->ruid); 268 bsd.euid = CAST_NOCHG(args->euid); 269 return (setreuid(td, &bsd)); 270 } 271 272 int 273 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 274 { 275 struct setresgid_args bsd; 276 277 bsd.rgid = CAST_NOCHG(args->rgid); 278 bsd.egid = CAST_NOCHG(args->egid); 279 bsd.sgid = CAST_NOCHG(args->sgid); 280 return (setresgid(td, &bsd)); 281 } 282 283 int 284 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 285 { 286 struct setresuid_args bsd; 287 288 bsd.ruid = CAST_NOCHG(args->ruid); 289 bsd.euid = CAST_NOCHG(args->euid); 290 bsd.suid = CAST_NOCHG(args->suid); 291 return (setresuid(td, &bsd)); 292 } 293