1 /* $NetBSD: linux_uid16.c,v 1.4 2014/05/20 17:31:18 njoly Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: linux_uid16.c,v 1.4 2014/05/20 17:31:18 njoly Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/proc.h> 37 #include <sys/kauth.h> 38 #include <sys/syscallargs.h> 39 40 #include <compat/linux/common/linux_types.h> 41 #include <compat/linux/common/linux_signal.h> 42 #include <compat/linux/linux_syscallargs.h> 43 44 #define LINUXTOBSD_UID(u) \ 45 (((u) == (linux_uid16_t)-1) ? -1 : (u)) 46 #define LINUXTOBSD_GID(g) \ 47 (((g) == (linux_gid16_t)-1) ? -1 : (g)) 48 49 #define BSDTOLINUX_UID(u) \ 50 (((u) & ~0xffff) ? (linux_uid16_t)65534 : (linux_uid16_t)(u)) 51 #define BSDTOLINUX_GID(g) \ 52 (((g) & ~0xffff) ? (linux_gid16_t)65534 : (linux_gid16_t)(g)) 53 54 #ifndef COMPAT_LINUX32 55 int 56 linux_sys_chown16(struct lwp *l, const struct linux_sys_chown16_args *uap, register_t *retval) 57 { 58 /* { 59 syscallarg(const char *) path; 60 syscallarg(linux_uid16_t) uid; 61 syscallarg(linux_gid16_t) gid; 62 } */ 63 struct sys___posix_chown_args bca; 64 65 SCARG(&bca, path) = SCARG(uap, path); 66 SCARG(&bca, uid) = LINUXTOBSD_UID(SCARG(uap, uid)); 67 SCARG(&bca, gid) = LINUXTOBSD_GID(SCARG(uap, gid)); 68 69 return sys___posix_chown(l, &bca, retval); 70 } 71 72 int 73 linux_sys_fchown16(struct lwp *l, const struct linux_sys_fchown16_args *uap, register_t *retval) 74 { 75 /* { 76 syscallarg(int) fd; 77 syscallarg(linux_uid16_t) uid; 78 syscallarg(linux_gid16_t) gid; 79 } */ 80 struct sys___posix_fchown_args bfa; 81 82 SCARG(&bfa, fd) = SCARG(uap, fd); 83 SCARG(&bfa, uid) = LINUXTOBSD_UID(SCARG(uap, uid)); 84 SCARG(&bfa, gid) = LINUXTOBSD_GID(SCARG(uap, gid)); 85 86 return sys___posix_fchown(l, &bfa, retval); 87 } 88 89 int 90 linux_sys_lchown16(struct lwp *l, const struct linux_sys_lchown16_args *uap, register_t *retval) 91 { 92 /* { 93 syscallarg(char *) path; 94 syscallarg(linux_uid16_t) uid; 95 syscallarg(linux_gid16_t) gid; 96 } */ 97 struct sys___posix_lchown_args bla; 98 99 SCARG(&bla, path) = SCARG(uap, path); 100 SCARG(&bla, uid) = LINUXTOBSD_UID(SCARG(uap, uid)); 101 SCARG(&bla, gid) = LINUXTOBSD_GID(SCARG(uap, gid)); 102 103 return sys___posix_lchown(l, &bla, retval); 104 } 105 106 int 107 linux_sys_setreuid16(struct lwp *l, const struct linux_sys_setreuid16_args *uap, register_t *retval) 108 { 109 /* { 110 syscallarg(linux_uid16_t) ruid; 111 syscallarg(linux_uid16_t) euid; 112 } */ 113 struct sys_setreuid_args bsa; 114 115 SCARG(&bsa, ruid) = LINUXTOBSD_UID(SCARG(uap, ruid)); 116 SCARG(&bsa, euid) = LINUXTOBSD_UID(SCARG(uap, euid)); 117 118 return sys_setreuid(l, &bsa, retval); 119 } 120 121 int 122 linux_sys_setregid16(struct lwp *l, const struct linux_sys_setregid16_args *uap, register_t *retval) 123 { 124 /* { 125 syscallarg(linux_gid16_t) rgid; 126 syscallarg(linux_gid16_t) egid; 127 } */ 128 struct sys_setregid_args bsa; 129 130 SCARG(&bsa, rgid) = LINUXTOBSD_GID(SCARG(uap, rgid)); 131 SCARG(&bsa, egid) = LINUXTOBSD_GID(SCARG(uap, egid)); 132 133 return sys_setregid(l, &bsa, retval); 134 } 135 136 int 137 linux_sys_setresuid16(struct lwp *l, const struct linux_sys_setresuid16_args *uap, register_t *retval) 138 { 139 /* { 140 syscallarg(linux_uid16_t) ruid; 141 syscallarg(linux_uid16_t) euid; 142 syscallarg(linux_uid16_t) suid; 143 } */ 144 struct linux_sys_setresuid_args lsa; 145 146 SCARG(&lsa, ruid) = LINUXTOBSD_UID(SCARG(uap, ruid)); 147 SCARG(&lsa, euid) = LINUXTOBSD_UID(SCARG(uap, euid)); 148 SCARG(&lsa, suid) = LINUXTOBSD_UID(SCARG(uap, suid)); 149 150 return linux_sys_setresuid(l, &lsa, retval); 151 } 152 153 int 154 linux_sys_setresgid16(struct lwp *l, const struct linux_sys_setresgid16_args *uap, register_t *retval) 155 { 156 /* { 157 syscallarg(linux_gid16_t) rgid; 158 syscallarg(linux_gid16_t) egid; 159 syscallarg(linux_gid16_t) sgid; 160 } */ 161 struct linux_sys_setresgid_args lsa; 162 163 SCARG(&lsa, rgid) = LINUXTOBSD_GID(SCARG(uap, rgid)); 164 SCARG(&lsa, egid) = LINUXTOBSD_GID(SCARG(uap, egid)); 165 SCARG(&lsa, sgid) = LINUXTOBSD_GID(SCARG(uap, sgid)); 166 167 return linux_sys_setresgid(l, &lsa, retval); 168 } 169 170 int 171 linux_sys_getresuid16(struct lwp *l, const struct linux_sys_getresuid16_args *uap, register_t *retval) 172 { 173 /* { 174 syscallarg(linux_uid16_t *) ruid; 175 syscallarg(linux_uid16_t *) euid; 176 syscallarg(linux_uid16_t *) suid; 177 } */ 178 kauth_cred_t pc = l->l_cred; 179 int error; 180 uid_t buid; 181 linux_uid16_t luid; 182 183 buid = kauth_cred_getuid(pc); 184 luid = BSDTOLINUX_UID(buid); 185 if ((error = copyout(&luid, SCARG(uap, ruid), sizeof(luid))) != 0) 186 return error; 187 188 buid = kauth_cred_geteuid(pc); 189 luid = BSDTOLINUX_UID(buid); 190 if ((error = copyout(&luid, SCARG(uap, euid), sizeof(luid))) != 0) 191 return error; 192 193 buid = kauth_cred_getsvuid(pc); 194 luid = BSDTOLINUX_UID(buid); 195 return (copyout(&luid, SCARG(uap, suid), sizeof(luid))); 196 } 197 198 int 199 linux_sys_getresgid16(struct lwp *l, const struct linux_sys_getresgid16_args *uap, register_t *retval) 200 { 201 /* { 202 syscallarg(linux_gid16_t *) rgid; 203 syscallarg(linux_gid16_t *) egid; 204 syscallarg(linux_gid16_t *) sgid; 205 } */ 206 kauth_cred_t pc = l->l_cred; 207 int error; 208 gid_t bgid; 209 linux_gid16_t lgid; 210 211 bgid = kauth_cred_getgid(pc); 212 lgid = BSDTOLINUX_GID(bgid); 213 if ((error = copyout(&lgid, SCARG(uap, rgid), sizeof(lgid))) != 0) 214 return error; 215 216 bgid = kauth_cred_getegid(pc); 217 lgid = BSDTOLINUX_GID(bgid); 218 if ((error = copyout(&lgid, SCARG(uap, egid), sizeof(lgid))) != 0) 219 return error; 220 221 bgid = kauth_cred_getsvgid(pc); 222 lgid = BSDTOLINUX_GID(bgid); 223 return (copyout(&lgid, SCARG(uap, sgid), sizeof(lgid))); 224 } 225 #endif /* !COMPAT_LINUX32 */ 226 227 int 228 linux_sys_getgroups16(struct lwp *l, const struct linux_sys_getgroups16_args *uap, register_t *retval) 229 { 230 /* { 231 syscallarg(int) gidsetsize; 232 syscallarg(linux_gid16_t *) gidset; 233 } */ 234 linux_gid16_t lset[16]; 235 linux_gid16_t *gidset; 236 unsigned int ngrps; 237 int i, n, j; 238 int error; 239 240 ngrps = kauth_cred_ngroups(l->l_cred); 241 *retval = ngrps; 242 if (SCARG(uap, gidsetsize) == 0) 243 return 0; 244 if (SCARG(uap, gidsetsize) < (int)ngrps) 245 return EINVAL; 246 247 gidset = SCARG(uap, gidset); 248 for (i = 0; i < (n = ngrps); i += n, gidset += n) { 249 n -= i; 250 if (n > __arraycount(lset)) 251 n = __arraycount(lset); 252 for (j = 0; j < n; j++) 253 lset[j] = kauth_cred_group(l->l_cred, i + j); 254 error = copyout(lset, gidset, n * sizeof(lset[0])); 255 if (error != 0) 256 return error; 257 } 258 259 return 0; 260 } 261 262 /* 263 * It is very unlikly that any problem using 16bit groups is written 264 * to allow for more than 16 of them, so don't bother trying to 265 * support that. 266 */ 267 #define COMPAT_NGROUPS16 16 268 269 int 270 linux_sys_setgroups16(struct lwp *l, const struct linux_sys_setgroups16_args *uap, register_t *retval) 271 { 272 /* { 273 syscallarg(int) gidsetsize; 274 syscallarg(linux_gid16_t *) gidset; 275 } */ 276 linux_gid16_t lset[COMPAT_NGROUPS16]; 277 kauth_cred_t ncred; 278 int error; 279 gid_t grbuf[COMPAT_NGROUPS16]; 280 unsigned int i, ngroups = SCARG(uap, gidsetsize); 281 282 if (ngroups > COMPAT_NGROUPS16) 283 return EINVAL; 284 error = copyin(SCARG(uap, gidset), lset, ngroups); 285 if (error != 0) 286 return error; 287 288 for (i = 0; i < ngroups; i++) 289 grbuf[i] = lset[i]; 290 291 ncred = kauth_cred_alloc(); 292 error = kauth_cred_setgroups(ncred, grbuf, SCARG(uap, gidsetsize), 293 -1, UIO_SYSSPACE); 294 if (error != 0) { 295 kauth_cred_free(ncred); 296 return error; 297 } 298 299 return kauth_proc_setgroups(l, ncred); 300 } 301
Indexes created Sun Sep 21 16:09:51 GMT 2025