netbsd32_module.c revision 1.6.2.5
1 /* $NetBSD: netbsd32_module.c,v 1.6.2.5 2018/09/11 04:53:42 pgoyette Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software developed for The NetBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: netbsd32_module.c,v 1.6.2.5 2018/09/11 04:53:42 pgoyette Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/dirent.h> 36 #include <sys/kauth.h> 37 #include <sys/module.h> 38 #include <sys/kobj.h> 39 40 #include <compat/netbsd32/netbsd32.h> 41 #include <compat/netbsd32/netbsd32_syscall.h> 42 #include <compat/netbsd32/netbsd32_syscallargs.h> 43 #include <compat/netbsd32/netbsd32_conv.h> 44 45 extern int (*vec_compat32_80_modctl)(struct lwp *, 46 const struct netbsd32_modctl_args *, register_t *); 47 48 static int 49 modctl32_handle_stat(struct netbsd32_iovec *iov, void *arg) 50 { 51 int ms_cnt; 52 modstat_t *ms, *mso; 53 size_t ms_len; 54 int req_cnt; 55 char *req, *reqo; 56 size_t req_len; 57 char *out_p; 58 size_t out_s; 59 60 modinfo_t *mi; 61 module_t *mod; 62 vaddr_t addr; 63 size_t size; 64 size_t used; 65 int off; 66 int error; 67 bool stataddr; 68 69 /* If not privileged, don't expose kernel addresses. */ 70 error = kauth_authorize_system(kauth_cred_get(), KAUTH_SYSTEM_MODULE, 71 0, (void *)(uintptr_t)MODCTL_STAT, NULL, NULL); 72 stataddr = (error == 0); 73 74 kernconfig_lock(); 75 ms_cnt = 0; 76 req_len = 1; 77 78 /* 79 * Count up the number of modstat_t needed, and total size of 80 * require_module lists on both active and built-in lists 81 */ 82 TAILQ_FOREACH(mod, &module_list, mod_chain) { 83 ms_cnt++; 84 mi = mod->mod_info; 85 if (mi->mi_required != NULL) { 86 req_cnt++; 87 req_len += strlen(mi->mi_required) + 1; 88 } 89 } 90 TAILQ_FOREACH(mod, &module_builtins, mod_chain) { 91 ms_cnt++; 92 mi = mod->mod_info; 93 if (mi->mi_required != NULL) { 94 req_cnt++; 95 req_len += strlen(mi->mi_required) + 1; 96 } 97 } 98 99 /* Allocate internal buffers to hold all the output data */ 100 ms_len = ms_cnt * sizeof(modstat_t); 101 ms = kmem_zalloc(ms_len, KM_SLEEP); 102 req = kmem_zalloc(req_len, KM_SLEEP); 103 104 mso = ms; 105 reqo = req++; 106 off = 1; 107 108 /* 109 * Load data into our internal buffers for both active and 110 * build-in module lists 111 */ 112 TAILQ_FOREACH(mod, &module_list, mod_chain) { 113 mi = mod->mod_info; 114 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 115 if (mi->mi_required != NULL) { 116 ms->ms_reqoffset = off; 117 used = strlcpy(req, mi->mi_required, req_len - off); 118 KASSERTMSG(used < req_len - off, "reqlist grew!"); 119 off = used + 1; 120 req += used + 1; 121 } else 122 ms->ms_reqoffset = 0; 123 if (mod->mod_kobj != NULL && stataddr) { 124 kobj_stat(mod->mod_kobj, &addr, &size); 125 ms->ms_addr = addr; 126 ms->ms_size = size; 127 } 128 ms->ms_class = mi->mi_class; 129 ms->ms_refcnt = mod->mod_refcnt; 130 ms->ms_source = mod->mod_source; 131 ms->ms_flags = mod->mod_flags; 132 ms++; 133 } 134 TAILQ_FOREACH(mod, &module_builtins, mod_chain) { 135 mi = mod->mod_info; 136 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 137 if (mi->mi_required != NULL) { 138 ms->ms_reqoffset = off; 139 used = strlcpy(req, mi->mi_required, req_len - off); 140 KASSERTMSG(used < req_len - off, "reqlist grew!"); 141 off += used + 1; 142 req += used + 1; 143 } else 144 ms->ms_reqoffset = 0; 145 if (mod->mod_kobj != NULL && stataddr) { 146 kobj_stat(mod->mod_kobj, &addr, &size); 147 ms->ms_addr = addr; 148 ms->ms_size = size; 149 } 150 ms->ms_class = mi->mi_class; 151 ms->ms_refcnt = -1; 152 KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL); 153 ms->ms_source = mod->mod_source; 154 ms++; 155 } 156 kernconfig_unlock(); 157 158 /* 159 * Now copyout our internal buffers back to userland 160 */ 161 out_p = NETBSD32PTR64(iov->iov_base); 162 out_s = iov->iov_len; 163 size = sizeof(ms_cnt); 164 165 /* Copy out the count of modstat_t */ 166 if (out_s) { 167 size = uimin(sizeof(ms_cnt), out_s); 168 error = copyout(&ms_cnt, out_p, size); 169 out_p += size; 170 out_s -= size; 171 } 172 /* Copy out the modstat_t array */ 173 if (out_s && error == 0) { 174 size = uimin(ms_len, out_s); 175 error = copyout(mso, out_p, size); 176 out_p += size; 177 out_s -= size; 178 } 179 /* Copy out the "required" strings */ 180 if (out_s && error == 0) { 181 size = uimin(req_len, out_s); 182 error = copyout(reqo, out_p, size); 183 out_p += size; 184 out_s -= size; 185 } 186 kmem_free(mso, ms_len); 187 kmem_free(reqo, req_len); 188 189 /* Finally, update the userland copy of the iovec's length */ 190 if (error == 0) { 191 iov->iov_len = ms_len + req_len + sizeof(ms_cnt); 192 error = copyout(iov, arg, sizeof(*iov)); 193 } 194 195 return error; 196 } 197 198 int 199 compat32_80_modctl_compat_stub(struct lwp *lwp, 200 const struct netbsd32_modctl_args *uap, register_t *result) 201 { 202 203 return EPASSTHROUGH; 204 } 205 206 int 207 netbsd32_modctl(struct lwp *lwp, const struct netbsd32_modctl_args *uap, 208 register_t *result) 209 { 210 /* { 211 syscallarg(int) cmd; 212 syscallarg(netbsd32_voidp) arg; 213 } */ 214 char buf[MAXMODNAME]; 215 struct netbsd32_iovec iov; 216 struct netbsd32_modctl_load ml; 217 int error; 218 void *arg; 219 #ifdef MODULAR 220 uintptr_t loadtype; 221 #endif 222 223 arg = SCARG_P32(uap, arg); 224 225 error = (*vec_compat32_80_modctl)(lwp, uap, result); 226 if (error != EPASSTHROUGH) 227 return error; 228 229 switch (SCARG(uap, cmd)) { 230 case MODCTL_LOAD: 231 error = copyin(arg, &ml, sizeof(ml)); 232 if (error != 0) 233 break; 234 error = handle_modctl_load(NETBSD32PTR64(ml.ml_filename), 235 ml.ml_flags, NETBSD32PTR64(ml.ml_props), ml.ml_propslen); 236 break; 237 238 case MODCTL_UNLOAD: 239 error = copyinstr(arg, buf, sizeof(buf), NULL); 240 if (error == 0) { 241 error = module_unload(buf); 242 } 243 break; 244 245 case MODCTL_STAT: 246 error = copyin(arg, &iov, sizeof(iov)); 247 if (error != 0) { 248 break; 249 } 250 error = modctl32_handle_stat(&iov, arg); 251 break; 252 253 case MODCTL_EXISTS: 254 #ifndef MODULAR 255 error = ENOSYS; 256 #else 257 loadtype = (uintptr_t)arg; 258 switch (loadtype) { /* 0 = modload, 1 = autoload */ 259 case 0: /* FALLTHROUGH */ 260 case 1: 261 error = kauth_authorize_system(kauth_cred_get(), 262 KAUTH_SYSTEM_MODULE, 0, 263 (void *)(uintptr_t)MODCTL_LOAD, 264 (void *)loadtype, NULL); 265 break; 266 267 default: 268 error = EINVAL; 269 break; 270 } 271 #endif 272 break; 273 274 default: 275 error = EINVAL; 276 break; 277 } 278 279 return error; 280 } 281
Indexes created Tue Sep 23 02:09:52 GMT 2025