FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_kobj_vfs.c

     /*      $NetBSD: subr_kobj_vfs.c,v 1.12 2021/06/29 22:40:53 dholland 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.
     */
    
    /*-
     * Copyright (c) 1998-2000 Doug Rabson
     * Copyright (c) 2004 Peter Wemm
     * All rights reserved.
     *
     * 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 AUTHOR 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 AUTHOR 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 loader vfs routines.
     */
    
    #include <sys/kobj_impl.h>
    
    #ifdef _KERNEL_OPT
    #include "opt_modular.h"
    #endif
    
    #ifdef MODULAR
    
    #include <sys/param.h>
    #include <sys/fcntl.h>
    #include <sys/module.h>
    #include <sys/namei.h>
    #include <sys/vnode.h>
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: subr_kobj_vfs.c,v 1.12 2021/06/29 22:40:53 dholland Exp $");
    
    static void
    kobj_close_vfs(kobj_t ko)
    {
    
            VOP_UNLOCK(ko->ko_source);
            vn_close(ko->ko_source, FREAD, kauth_cred_get());
    }
    
    /*
     * kobj_read:
     *
     *      Utility function: read from the object.
     */
    static int
    kobj_read_vfs(kobj_t ko, void **basep, size_t size, off_t off,
            bool allocate)
    {
            size_t resid;
            void *base;
            int error;
   
           KASSERT(ko->ko_source != NULL);
   
           if (allocate) {
                   base = kmem_alloc(size, KM_SLEEP);
           } else {
                   base = *basep;
   #ifdef DIAGNOSTIC
                   bool ok = false;
                   if ((uintptr_t)base >= (uintptr_t)ko->ko_text_address &&
                       (uintptr_t)base + size <=
                       (uintptr_t)ko->ko_text_address + ko->ko_text_size)
                           ok = true;
                   if ((uintptr_t)base >= (uintptr_t)ko->ko_data_address &&
                       (uintptr_t)base + size <=
                       (uintptr_t)ko->ko_data_address + ko->ko_data_size)
                           ok = true;
                   if ((uintptr_t)base >= (uintptr_t)ko->ko_rodata_address &&
                       (uintptr_t)base + size <=
                       (uintptr_t)ko->ko_rodata_address + ko->ko_rodata_size)
                           ok = true;
                   if (!ok)
                           panic("kobj_read_vfs: not in a dedicated segment");
   #endif
           }
   
           error = vn_rdwr(UIO_READ, ko->ko_source, base, size, off,
               UIO_SYSSPACE, IO_NODELOCKED, curlwp->l_cred, &resid,
               curlwp);
   
           if (error == 0 && resid != 0) {
                   error = EINVAL;
           }
   
           if (allocate && error != 0) {
                   kmem_free(base, size);
                   base = NULL;
           }
   
           if (allocate)
                   *basep = base;
   
           return error;
   }
   
   /*
    * kobj_load_vfs:
    *
    *      Load an object located in the file system.
    */
   int
   kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot)
   {
           struct pathbuf *pb;
           struct vnode *vp;
           int error;
           kobj_t ko;
   
           KASSERT(path != NULL);
           if (strchr(path, '/') == NULL)
                   return ENOENT;
   
           ko = kmem_zalloc(sizeof(*ko), KM_SLEEP);
           pb = pathbuf_create(path);
           if (pb == NULL) {
                   kmem_free(ko, sizeof(*ko));
                   return ENOMEM;
           }
   
           error = vn_open(NULL, pb, (nochroot ? NOCHROOT : 0), FREAD, 0,
               &vp, NULL, NULL);
   
           if (error != 0) {
                   pathbuf_destroy(pb);
                   kmem_free(ko, sizeof(*ko));
                   return error;
           }
   
           ko->ko_type = KT_VNODE;
           kobj_setname(ko, path);
           ko->ko_source = vp;
           ko->ko_read = kobj_read_vfs;
           ko->ko_close = kobj_close_vfs;
           pathbuf_destroy(pb);
   
           *kop = ko;
           return kobj_load(ko);
   }
   
   #else /* MODULAR */
   
   int
   kobj_load_vfs(kobj_t *kop, const char *path, const bool nochroot)
   {
   
           return ENOSYS;
   }
   
   #endif

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