netbsd32_module.c revision 1.6
1 /* $NetBSD: netbsd32_module.c,v 1.6 2018/01/18 13:31:21 maxv 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 2018/01/18 13:31:21 maxv 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 static int 46 modctl32_handle_stat(struct netbsd32_iovec *iov, void *arg) 47 { 48 modstat_t *ms, *mso; 49 modinfo_t *mi; 50 module_t *mod; 51 vaddr_t addr; 52 size_t size; 53 size_t mslen; 54 int error; 55 bool stataddr; 56 57 /* If not privileged, don't expose kernel addresses. */ 58 error = kauth_authorize_system(kauth_cred_get(), KAUTH_SYSTEM_MODULE, 59 0, (void *)(uintptr_t)MODCTL_STAT, NULL, NULL); 60 stataddr = (error == 0); 61 62 kernconfig_lock(); 63 mslen = (module_count+module_builtinlist+1) * sizeof(modstat_t); 64 mso = kmem_zalloc(mslen, KM_SLEEP); 65 ms = mso; 66 TAILQ_FOREACH(mod, &module_list, mod_chain) { 67 mi = mod->mod_info; 68 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 69 if (mi->mi_required != NULL) { 70 strlcpy(ms->ms_required, mi->mi_required, 71 sizeof(ms->ms_required)); 72 } 73 if (mod->mod_kobj != NULL && stataddr) { 74 kobj_stat(mod->mod_kobj, &addr, &size); 75 ms->ms_addr = addr; 76 ms->ms_size = size; 77 } 78 ms->ms_class = mi->mi_class; 79 ms->ms_refcnt = mod->mod_refcnt; 80 ms->ms_source = mod->mod_source; 81 ms->ms_flags = mod->mod_flags; 82 ms++; 83 } 84 TAILQ_FOREACH(mod, &module_builtins, mod_chain) { 85 mi = mod->mod_info; 86 strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name)); 87 if (mi->mi_required != NULL) { 88 strlcpy(ms->ms_required, mi->mi_required, 89 sizeof(ms->ms_required)); 90 } 91 if (mod->mod_kobj != NULL && stataddr) { 92 kobj_stat(mod->mod_kobj, &addr, &size); 93 ms->ms_addr = addr; 94 ms->ms_size = size; 95 } 96 ms->ms_class = mi->mi_class; 97 ms->ms_refcnt = -1; 98 KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL); 99 ms->ms_source = mod->mod_source; 100 ms++; 101 } 102 kernconfig_unlock(); 103 error = copyout(mso, NETBSD32PTR64(iov->iov_base), 104 min(mslen - sizeof(modstat_t), iov->iov_len)); 105 kmem_free(mso, mslen); 106 if (error == 0) { 107 iov->iov_len = mslen - sizeof(modstat_t); 108 error = copyout(iov, arg, sizeof(*iov)); 109 } 110 111 return error; 112 } 113 114 int 115 netbsd32_modctl(struct lwp *lwp, const struct netbsd32_modctl_args *uap, 116 register_t *result) 117 { 118 /* { 119 syscallarg(int) cmd; 120 syscallarg(netbsd32_voidp) arg; 121 } */ 122 char buf[MAXMODNAME]; 123 struct netbsd32_iovec iov; 124 struct netbsd32_modctl_load ml; 125 int error; 126 void *arg; 127 #ifdef MODULAR 128 uintptr_t loadtype; 129 #endif 130 131 arg = SCARG_P32(uap, arg); 132 133 switch (SCARG(uap, cmd)) { 134 case MODCTL_LOAD: 135 error = copyin(arg, &ml, sizeof(ml)); 136 if (error != 0) 137 break; 138 error = handle_modctl_load(NETBSD32PTR64(ml.ml_filename), 139 ml.ml_flags, NETBSD32PTR64(ml.ml_props), ml.ml_propslen); 140 break; 141 142 case MODCTL_UNLOAD: 143 error = copyinstr(arg, buf, sizeof(buf), NULL); 144 if (error == 0) { 145 error = module_unload(buf); 146 } 147 break; 148 149 case MODCTL_STAT: 150 error = copyin(arg, &iov, sizeof(iov)); 151 if (error != 0) { 152 break; 153 } 154 error = modctl32_handle_stat(&iov, arg); 155 break; 156 157 case MODCTL_EXISTS: 158 #ifndef MODULAR 159 error = ENOSYS; 160 #else 161 loadtype = (uintptr_t)arg; 162 switch (loadtype) { /* 0 = modload, 1 = autoload */ 163 case 0: /* FALLTHROUGH */ 164 case 1: 165 error = kauth_authorize_system(kauth_cred_get(), 166 KAUTH_SYSTEM_MODULE, 0, 167 (void *)(uintptr_t)MODCTL_LOAD, 168 (void *)loadtype, NULL); 169 break; 170 171 default: 172 error = EINVAL; 173 break; 174 } 175 #endif 176 break; 177 178 default: 179 error = EINVAL; 180 break; 181 } 182 183 return error; 184 } 185
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