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