sys/compat/irix/irix_mount.c

   1 /*      $NetBSD: irix_mount.c,v 1.22 2008/04/28 20:23:41 martin Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Emmanuel Dreyfus.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: irix_mount.c,v 1.22 2008/04/28 20:23:41 martin Exp $");
  34
  35 #include <sys/types.h>
  36 #include <sys/signal.h>
  37 #include <sys/param.h>
  38 #include <sys/proc.h>
  39 #include <sys/mount.h>
  40 #include <sys/namei.h>
  41 #include <sys/systm.h>
  42 #include <sys/vnode.h>
  43 #include <sys/vnode_if.h>
  44 #include <sys/kauth.h>
  45
  46 #include <compat/common/compat_util.h>
  47
  48 #include <compat/irix/irix_types.h>
  49 #include <compat/irix/irix_signal.h>
  50 #include <compat/irix/irix_syscall.h>
  51 #include <compat/irix/irix_syscallargs.h>
  52
  53 int
  54 irix_sys_getmountid(struct lwp *l, const struct irix_sys_getmountid_args *uap, register_t *retval)
  55 {
  56         /* {
  57                 syscallarg(const char *) path;
  58                 syscallarg(irix_mountid_t *) buf;
  59         } */
  60         kauth_cred_t cred;
  61         struct vnode *vp;
  62         int error = 0;
  63         struct nameidata nd;
  64         irix_mountid_t mountid;
  65         void *addr;
  66
  67         cred = kauth_cred_dup(l->l_cred);
  68         kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred));
  69         kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred));
  70
  71         /* Get the vnode for the requested path */
  72         NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
  73             SCARG(uap, path));
  74         nd.ni_cnd.cn_cred = cred;
  75         if ((error = namei(&nd)) != 0)
  76                 goto out;
  77         vp = nd.ni_vp;
  78
  79         /* Check for accessibility */
  80         if ((error = VOP_ACCESS(vp, VREAD | VEXEC, cred)) != 0)
  81                 goto bad;
  82
  83         /*
  84          * Return the address of the mount structure
  85          * as the unique ID for the filesystem
  86          */
  87         addr = (void *)&vp->v_mount;
  88         memset((void *)&mountid, 0, sizeof(mountid));
  89         (void)memcpy((void *)&mountid, &addr, sizeof(addr));
  90         error = copyout(&mountid, SCARG(uap, buf), sizeof(mountid));
  91
  92 bad:
  93         vput(vp);
  94 out:
  95         kauth_cred_free(cred);
  96         return (error);
  97 }