kern_mod_80.c revision 1.1.2.3
1 /* $NetBSD: kern_mod_80.c,v 1.1.2.3 2018/09/06 21:37:43 pgoyette Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * System calls relating to loadable modules. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: kern_mod_80.c,v 1.1.2.3 2018/09/06 21:37:43 pgoyette Exp $"); 35 36 #ifdef _KERNEL_OPT 37 #include "opt_modular.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/proc.h> 43 #include <sys/namei.h> 44 #include <sys/kauth.h> 45 #include <sys/kmem.h> 46 #include <sys/kobj.h> 47 #include <sys/module.h> 48 #include <sys/syscall.h> 49 #include <sys/syscallargs.h> 50 #include <sys/compat_stub.h> 51 52 #include <compat/common/compat_mod.h> 53 54 static void 55 copy_oalias(omodstat_t *oms, const char * const *aliasp, modinfo_t *mi, 56 module_t *mod) 57 { 58 59 strlcpy(oms->oms_name, *aliasp, sizeof(oms->oms_name)); 60 strlcpy(oms->oms_required, mi->mi_name, sizeof(oms->oms_required)); 61 oms->oms_class = mi->mi_class; 62 oms->oms_source = mod->mod_source; 63 oms->oms_flags = mod->mod_flags | MODFLG_IS_ALIAS; 64 } 65 66 static int 67 compat_80_modstat(int cmd, struct iovec *iov, void *arg) 68 { 69 omodstat_t *oms, *omso; 70 modinfo_t *mi; 71 module_t *mod; 72 vaddr_t addr; 73 size_t size; 74 size_t omslen; 75 size_t used; 76 int error; 77 int omscnt; 78 bool stataddr; 79 const char * const *aliasp; 80 const char *suffix = "..."; 81 82 if (cmd != MODCTL_OSTAT) 83 return EINVAL; 84 85 error = copyin(arg, iov, sizeof(*iov)); 86 if (error != 0) { 87 return error; 88 } 89 90 /* If not privileged, don't expose kernel addresses. */ 91 error = kauth_authorize_system(kauth_cred_get(), KAUTH_SYSTEM_MODULE, 92 0, (void *)(uintptr_t)MODCTL_STAT, NULL, NULL); 93 stataddr = (error == 0); 94 95 kernconfig_lock(); 96 omscnt = 0; 97 TAILQ_FOREACH(mod, &module_list, mod_chain) { 98 omscnt++; 99 mi = mod->mod_info; 100 if ((aliasp = *mi->mi_aliases) != NULL) { 101 while (*aliasp++ != NULL) 102 omscnt++; 103 } 104 } 105 TAILQ_FOREACH(mod, &module_builtins, mod_chain) { 106 omscnt++; 107 mi = mod->mod_info; 108 if ((aliasp = *mi->mi_aliases) != NULL) { 109 while (*aliasp++ != NULL) 110 omscnt++; 111 } 112 } 113 omslen = omscnt * sizeof(omodstat_t); 114 omso = kmem_zalloc(omslen, KM_SLEEP); 115 oms = omso; 116 TAILQ_FOREACH(mod, &module_list, mod_chain) { 117 mi = mod->mod_info; 118 strlcpy(oms->oms_name, mi->mi_name, sizeof(oms->oms_name)); 119 if (mi->mi_required != NULL) { 120 used = strlcpy(oms->oms_required, mi->mi_required, 121 sizeof(oms->oms_required)); 122 if (used >= sizeof(oms->oms_required)) { 123 oms->oms_required[sizeof(oms->oms_required) - 124 strlen(suffix) - 1] = '\0'; 125 strlcat(oms->oms_required, suffix, 126 sizeof(oms->oms_required)); 127 } 128 } 129 if (mod->mod_kobj != NULL && stataddr) { 130 kobj_stat(mod->mod_kobj, &addr, &size); 131 oms->oms_addr = addr; 132 oms->oms_size = size; 133 } 134 oms->oms_class = mi->mi_class; 135 oms->oms_refcnt = mod->mod_refcnt; 136 oms->oms_source = mod->mod_source; 137 oms->oms_flags = mod->mod_flags; 138 oms++; 139 aliasp = *mi->mi_aliases; 140 if (aliasp == NULL) 141 continue; 142 while (*aliasp) { 143 copy_oalias(oms, aliasp, mi, mod); 144 aliasp++; 145 oms++; 146 } 147 } 148 TAILQ_FOREACH(mod, &module_builtins, mod_chain) { 149 mi = mod->mod_info; 150 strlcpy(oms->oms_name, mi->mi_name, sizeof(oms->oms_name)); 151 if (mi->mi_required != NULL) { 152 used = strlcpy(oms->oms_required, mi->mi_required, 153 sizeof(oms->oms_required)); 154 if (used >= sizeof(oms->oms_required)) { 155 oms->oms_required[sizeof(oms->oms_required) - 156 strlen(suffix) - 1] = '\0'; 157 strlcat(oms->oms_required, suffix, 158 sizeof(oms->oms_required)); 159 } 160 } 161 if (mod->mod_kobj != NULL && stataddr) { 162 kobj_stat(mod->mod_kobj, &addr, &size); 163 oms->oms_addr = addr; 164 oms->oms_size = size; 165 } 166 oms->oms_class = mi->mi_class; 167 oms->oms_refcnt = -1; 168 KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL); 169 oms->oms_source = mod->mod_source; 170 oms++; 171 aliasp = *mi->mi_aliases; 172 if (aliasp == NULL) 173 continue; 174 while (*aliasp) { 175 copy_oalias(oms, aliasp, mi, mod); 176 aliasp++; 177 oms++; 178 } 179 } 180 kernconfig_unlock(); 181 error = copyout(omso, iov->iov_base, uimin(omslen, iov->iov_len)); 182 kmem_free(omso, omslen); 183 if (error == 0) { 184 iov->iov_len = omslen; 185 error = copyout(iov, arg, sizeof(*iov)); 186 } 187 188 return error; 189 } 190 191 void 192 kern_mod_80_init(void) 193 { 194 195 compat_modstat_80 = compat_80_modstat; 196 } 197 198 void 199 kern_mod_80_fini(void) 200 { 201 202 compat_modstat_80 = (void *)enosys; 203 } 204
Indexes created Thu Oct 02 01:09:59 GMT 2025