linux_uid16.c revision 156874
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: head/sys/compat/linux/linux_uid16.c 156874 2006-03-19 11:10:33Z ru $"); 29 30#include "opt_compat.h" 31 32#include <sys/param.h> 33#include <sys/lock.h> 34#include <sys/malloc.h> 35#include <sys/mutex.h> 36#include <sys/proc.h> 37#include <sys/syscallsubr.h> 38#include <sys/sysproto.h> 39#include <sys/systm.h> 40 41#ifdef COMPAT_LINUX32 42#include <machine/../linux32/linux.h> 43#include <machine/../linux32/linux32_proto.h> 44#else 45#include <machine/../linux/linux.h> 46#include <machine/../linux/linux_proto.h> 47#endif 48 49#include <compat/linux/linux_util.h> 50 51DUMMY(setfsuid16); 52DUMMY(setfsgid16); 53DUMMY(getresuid16); 54DUMMY(getresgid16); 55 56#define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x) 57 58int 59linux_chown16(struct thread *td, struct linux_chown16_args *args) 60{ 61 char *path; 62 int error; 63 64 LCONVPATHEXIST(td, args->path, &path); 65 66#ifdef DEBUG 67 if (ldebug(chown16)) 68 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid); 69#endif 70 error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 71 CAST_NOCHG(args->gid)); 72 LFREEPATH(path); 73 return (error); 74} 75 76int 77linux_lchown16(struct thread *td, struct linux_lchown16_args *args) 78{ 79 char *path; 80 int error; 81 82 LCONVPATHEXIST(td, args->path, &path); 83 84#ifdef DEBUG 85 if (ldebug(lchown16)) 86 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid, 87 args->gid); 88#endif 89 error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid), 90 CAST_NOCHG(args->gid)); 91 LFREEPATH(path); 92 return (error); 93} 94 95int 96linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args) 97{ 98 struct ucred *newcred, *oldcred; 99 l_gid16_t linux_gidset[NGROUPS]; 100 gid_t *bsd_gidset; 101 int ngrp, error; 102 struct proc *p; 103 104#ifdef DEBUG 105 if (ldebug(setgroups16)) 106 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize); 107#endif 108 109 ngrp = args->gidsetsize; 110 if (ngrp < 0 || ngrp >= NGROUPS) 111 return (EINVAL); 112 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t)); 113 if (error) 114 return (error); 115 newcred = crget(); 116 p = td->td_proc; 117 PROC_LOCK(p); 118 oldcred = p->p_ucred; 119 120 /* 121 * cr_groups[0] holds egid. Setting the whole set from 122 * the supplied set will cause egid to be changed too. 123 * Keep cr_groups[0] unchanged to prevent that. 124 */ 125 126 if ((error = suser_cred(oldcred, SUSER_ALLOWJAIL)) != 0) { 127 PROC_UNLOCK(p); 128 crfree(newcred); 129 return (error); 130 } 131 132 crcopy(newcred, oldcred); 133 if (ngrp > 0) { 134 newcred->cr_ngroups = ngrp + 1; 135 136 bsd_gidset = newcred->cr_groups; 137 ngrp--; 138 while (ngrp >= 0) { 139 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 140 ngrp--; 141 } 142 } 143 else 144 newcred->cr_ngroups = 1; 145 146 setsugid(td->td_proc); 147 p->p_ucred = newcred; 148 PROC_UNLOCK(p); 149 crfree(oldcred); 150 return (0); 151} 152 153int 154linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args) 155{ 156 struct ucred *cred; 157 l_gid16_t linux_gidset[NGROUPS]; 158 gid_t *bsd_gidset; 159 int bsd_gidsetsz, ngrp, error; 160 161#ifdef DEBUG 162 if (ldebug(getgroups16)) 163 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize); 164#endif 165 166 cred = td->td_ucred; 167 bsd_gidset = cred->cr_groups; 168 bsd_gidsetsz = cred->cr_ngroups - 1; 169 170 /* 171 * cr_groups[0] holds egid. Returning the whole set 172 * here will cause a duplicate. Exclude cr_groups[0] 173 * to prevent that. 174 */ 175 176 if ((ngrp = args->gidsetsize) == 0) { 177 td->td_retval[0] = bsd_gidsetsz; 178 return (0); 179 } 180 181 if (ngrp < bsd_gidsetsz) 182 return (EINVAL); 183 184 ngrp = 0; 185 while (ngrp < bsd_gidsetsz) { 186 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 187 ngrp++; 188 } 189 190 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t)); 191 if (error) 192 return (error); 193 194 td->td_retval[0] = ngrp; 195 return (0); 196} 197 198/* 199 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1] 200 * when COMPAT_43 is defined. This globbers registers that 201 * are assumed to be preserved. The following lightweight syscalls fixes 202 * this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in 203 * linux_misc.c 204 * 205 * linux_getgid16() - MP SAFE 206 * linux_getuid16() - MP SAFE 207 */ 208 209int 210linux_getgid16(struct thread *td, struct linux_getgid16_args *args) 211{ 212 213 td->td_retval[0] = td->td_ucred->cr_rgid; 214 return (0); 215} 216 217int 218linux_getuid16(struct thread *td, struct linux_getuid16_args *args) 219{ 220 221 td->td_retval[0] = td->td_ucred->cr_ruid; 222 return (0); 223} 224 225int 226linux_getegid16(struct thread *td, struct linux_getegid16_args *args) 227{ 228 struct getegid_args bsd; 229 230 return (getegid(td, &bsd)); 231} 232 233int 234linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args) 235{ 236 struct geteuid_args bsd; 237 238 return (geteuid(td, &bsd)); 239} 240 241int 242linux_setgid16(struct thread *td, struct linux_setgid16_args *args) 243{ 244 struct setgid_args bsd; 245 246 bsd.gid = args->gid; 247 return (setgid(td, &bsd)); 248} 249 250int 251linux_setuid16(struct thread *td, struct linux_setuid16_args *args) 252{ 253 struct setuid_args bsd; 254 255 bsd.uid = args->uid; 256 return (setuid(td, &bsd)); 257} 258 259int 260linux_setregid16(struct thread *td, struct linux_setregid16_args *args) 261{ 262 struct setregid_args bsd; 263 264 bsd.rgid = CAST_NOCHG(args->rgid); 265 bsd.egid = CAST_NOCHG(args->egid); 266 return (setregid(td, &bsd)); 267} 268 269int 270linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args) 271{ 272 struct setreuid_args bsd; 273 274 bsd.ruid = CAST_NOCHG(args->ruid); 275 bsd.euid = CAST_NOCHG(args->euid); 276 return (setreuid(td, &bsd)); 277} 278 279int 280linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args) 281{ 282 struct setresgid_args bsd; 283 284 bsd.rgid = CAST_NOCHG(args->rgid); 285 bsd.egid = CAST_NOCHG(args->egid); 286 bsd.sgid = CAST_NOCHG(args->sgid); 287 return (setresgid(td, &bsd)); 288} 289 290int 291linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args) 292{ 293 struct setresuid_args bsd; 294 295 bsd.ruid = CAST_NOCHG(args->ruid); 296 bsd.euid = CAST_NOCHG(args->euid); 297 bsd.suid = CAST_NOCHG(args->suid); 298 return (setresuid(td, &bsd)); 299} 300