/*      $NetBSD: kern_module_vfs.c,v 1.19 2025/03/20 13:26:54 pgoyette Exp $    */

/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software developed for The NetBSD Foundation
* by Andrew Doran.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* Kernel module file system interaction.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_module_vfs.c,v 1.19 2025/03/20 13:26:54 pgoyette Exp $");

#define _MODULE_INTERNAL
#include <sys/param.h>
#include <sys/fcntl.h>
#include <sys/kmem.h>
#include <sys/kobj.h>
#include <sys/module.h>
#include <sys/namei.h>
#include <sys/pool.h>
#include <sys/stat.h>
#include <sys/vnode.h>

#include <prop/proplib.h>

static int      module_load_plist_vfs(const char *, const bool,
                                     prop_dictionary_t *);

void
module_load_vfs_init(void)
{
       module_load_vfs_vec = module_load_vfs;
       aprint_normal("kern.module.path=%s\n", module_base);
}

int
module_load_vfs(const char *name, int flags, bool autoload,
       module_t *mod, prop_dictionary_t *filedictp)
{
       char *path;
       bool nochroot;
       int error;
       prop_bool_t noload;
       prop_dictionary_t moduledict;

       nochroot = false;
       error = 0;
       path = NULL;
       moduledict = NULL;
       if (filedictp)
               *filedictp = NULL;
       path = PNBUF_GET();

       if (!autoload) {
               if (strchr(name,  '/') != NULL) {
                       nochroot = false;
                       snprintf(path, MAXPATHLEN, "%s", name);
                       module_print("Loading module from %s", path);
                       error = kobj_load_vfs(&mod->mod_kobj, path, nochroot);
               } else
                       error = ENOENT;
       }
       if (autoload || (error == ENOENT)) {
               if (strchr(name, '/') == NULL) {
                       nochroot = true;
                       snprintf(path, MAXPATHLEN, "%s/%s/%s.kmod",
                           module_base, name, name);
                       module_print("Loading module from %s", path);
                       error = kobj_load_vfs(&mod->mod_kobj, path, nochroot);
               } else
                       error = ENOENT;
       }
       if (error != 0) {
               PNBUF_PUT(path);
               module_print("Cannot %sload kernel object `%s'"
                   " error=%d", autoload ? "auto" : "", name, error);
               return error;
       }

       /*
        * Load and process <module>.plist if it exists.
        */
       if ((!ISSET(flags, MODCTL_NO_PROP) && filedictp) || autoload) {
               error = module_load_plist_vfs(path, nochroot, &moduledict);
               if (error != 0) {
                       module_print("plist load returned error %d for `%s'",
                           error, path);
                       if (error != ENOENT)
                               goto fail;
               } else if (autoload) {
                       noload = prop_dictionary_get(moduledict, "noautoload");
                       if (noload != NULL && prop_bool_true(noload)) {
                               module_error("autoloading is disallowed for "
                                   "`%s'", path);
                               prop_object_release(moduledict);
                               error = EPERM;
                               goto fail;
                       }
               }
               if (error == 0) {       /* can get here if error == ENOENT */
                       if (!ISSET(flags, MODCTL_NO_PROP) && filedictp)
                               *filedictp = moduledict;
                       else
                               prop_object_release(moduledict);
               }
       }

       PNBUF_PUT(path);
       return 0;

fail:
       kobj_unload(mod->mod_kobj);
       PNBUF_PUT(path);
       return error;
}

/*
* module_load_plist_vfs:
*
*      Load a plist located in the file system into memory.
*/
static int
module_load_plist_vfs(const char *modpath, const bool nochroot,
   prop_dictionary_t *filedictp)
{
       struct pathbuf *pb;
       struct vnode *vp;
       struct stat sb;
       void *base;
       char *proppath;
       const size_t plistsize = 8192;
       size_t resid;
       int error, pathlen;

       KASSERT(filedictp != NULL);
       base = NULL;

       proppath = PNBUF_GET();
       strlcpy(proppath, modpath, MAXPATHLEN);
       pathlen = strlen(proppath);
       if ((pathlen >= 6) && (strcmp(&proppath[pathlen - 5], ".kmod") == 0)) {
               strcpy(&proppath[pathlen - 5], ".plist");
       } else if (pathlen < MAXPATHLEN - 6) {
                       strcat(proppath, ".plist");
       } else {
               error = ENOENT;
               goto out1;
       }

       /* XXX this makes an unnecessary extra copy of the path */
       pb = pathbuf_create(proppath);
       if (pb == NULL) {
               error = ENOMEM;
               goto out1;
       }
       module_print("Loading plist from %s", proppath);

       error = vn_open(NULL, pb, (nochroot ? NOCHROOT : 0), FREAD, 0,
           &vp, NULL, NULL);
       if (error != 0) {
               goto out2;
       }

       error = vn_stat(vp, &sb);
       if (error != 0) {
               goto out3;
       }
       if (sb.st_size >= (plistsize - 1)) {    /* leave space for term \0 */
               error = EFBIG;
               goto out3;
       }

       base = kmem_alloc(plistsize, KM_SLEEP);
       error = vn_rdwr(UIO_READ, vp, base, sb.st_size, 0,
           UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid, curlwp);
       *((uint8_t *)base + sb.st_size) = '\0';
       if (error == 0 && resid != 0) {
               error = EFBIG;
       }
       if (error != 0) {
               kmem_free(base, plistsize);
               base = NULL;
               goto out3;
       }

       *filedictp = prop_dictionary_internalize(base);
       if (*filedictp == NULL) {
               error = EINVAL;
       }
       kmem_free(base, plistsize);
       base = NULL;
       KASSERT(error == 0);

out3:
       VOP_UNLOCK(vp);
       vn_close(vp, FREAD, kauth_cred_get());

out2:
       pathbuf_destroy(pb);

out1:
       PNBUF_PUT(proppath);
       return error;
}

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