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netbsd32_module.c revision 1.5 
      1 /*	$NetBSD: netbsd32_module.c,v 1.5 2017/06/01 02:45:08 chs 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 1.5 2017/06/01 02:45:08 chs 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 
     56 	kernconfig_lock();
     57 	mslen = (module_count+module_builtinlist+1) * sizeof(modstat_t);
     58 	mso = kmem_zalloc(mslen, KM_SLEEP);
     59 	ms = mso;
     60 	TAILQ_FOREACH(mod, &module_list, mod_chain) {
     61 		mi = mod->mod_info;
     62 		strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name));
     63 		if (mi->mi_required != NULL) {
     64 			strlcpy(ms->ms_required, mi->mi_required,
     65 			    sizeof(ms->ms_required));
     66 		}
     67 		if (mod->mod_kobj != NULL) {
     68 			kobj_stat(mod->mod_kobj, &addr, &size);
     69 			ms->ms_addr = addr;
     70 			ms->ms_size = size;
     71 		}
     72 		ms->ms_class = mi->mi_class;
     73 		ms->ms_refcnt = mod->mod_refcnt;
     74 		ms->ms_source = mod->mod_source;
     75 		ms->ms_flags = mod->mod_flags;
     76 		ms++;
     77 	}
     78 	TAILQ_FOREACH(mod, &module_builtins, mod_chain) {
     79 		mi = mod->mod_info;
     80 		strlcpy(ms->ms_name, mi->mi_name, sizeof(ms->ms_name));
     81 		if (mi->mi_required != NULL) {
     82 			strlcpy(ms->ms_required, mi->mi_required,
     83 			    sizeof(ms->ms_required));
     84 		}
     85 		if (mod->mod_kobj != NULL) {
     86 			kobj_stat(mod->mod_kobj, &addr, &size);
     87 			ms->ms_addr = addr;
     88 			ms->ms_size = size;
     89 		}
     90 		ms->ms_class = mi->mi_class;
     91 		ms->ms_refcnt = -1;
     92 		KASSERT(mod->mod_source == MODULE_SOURCE_KERNEL);
     93 		ms->ms_source = mod->mod_source;
     94 		ms++;
     95 	}
     96 	kernconfig_unlock();
     97 	error = copyout(mso, NETBSD32PTR64(iov->iov_base),
     98 	    min(mslen - sizeof(modstat_t), iov->iov_len));
     99 	kmem_free(mso, mslen);
    100 	if (error == 0) {
    101 		iov->iov_len = mslen - sizeof(modstat_t);
    102 		error = copyout(iov, arg, sizeof(*iov));
    103 	}
    104 
    105 	return error;
    106 }
    107 
    108 int
    109 netbsd32_modctl(struct lwp *lwp, const struct netbsd32_modctl_args *uap,
    110 	register_t *result)
    111 {
    112 	/* {
    113 		syscallarg(int) cmd;
    114 		syscallarg(netbsd32_voidp) arg;
    115 	} */
    116 	char buf[MAXMODNAME];
    117 	struct netbsd32_iovec iov;
    118 	struct netbsd32_modctl_load ml;
    119 	int error;
    120 	void *arg;
    121 #ifdef MODULAR
    122 	uintptr_t loadtype;
    123 #endif
    124 
    125 	arg = SCARG_P32(uap, arg);
    126 
    127 	switch (SCARG(uap, cmd)) {
    128 	case MODCTL_LOAD:
    129 		error = copyin(arg, &ml, sizeof(ml));
    130 		if (error != 0)
    131 			break;
    132 		error = handle_modctl_load(NETBSD32PTR64(ml.ml_filename),
    133 		     ml.ml_flags, NETBSD32PTR64(ml.ml_props), ml.ml_propslen);
    134 		break;
    135 
    136 	case MODCTL_UNLOAD:
    137 		error = copyinstr(arg, buf, sizeof(buf), NULL);
    138 		if (error == 0) {
    139 			error = module_unload(buf);
    140 		}
    141 		break;
    142 
    143 	case MODCTL_STAT:
    144 		error = copyin(arg, &iov, sizeof(iov));
    145 		if (error != 0) {
    146 			break;
    147 		}
    148 		error = modctl32_handle_stat(&iov, arg);
    149 		break;
    150 
    151 	case MODCTL_EXISTS:
    152 #ifndef MODULAR
    153 		error = ENOSYS;
    154 #else
    155 		loadtype = (uintptr_t)arg;
    156 		switch (loadtype) {	/* 0 = modload, 1 = autoload */
    157 		case 0:			/* FALLTHROUGH */
    158 		case 1:
    159 			error = kauth_authorize_system(kauth_cred_get(),
    160 			     KAUTH_SYSTEM_MODULE, 0,
    161 			     (void *)(uintptr_t)MODCTL_LOAD,
    162 			     (void *)loadtype, NULL);
    163 			break;
    164 
    165 		default:
    166 			error = EINVAL;
    167 			break;
    168 		}
    169 #endif
    170 		break;
    171 
    172 	default:
    173 		error = EINVAL;
    174 		break;
    175 	}
    176 
    177 	return error;
    178 }
    179