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      1 /*	$NetBSD: accessors.c,v 1.3 2016/01/26 23:12:17 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2007-2011 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * This file contains various data structure accessor routines.
     30  * They are meant to help clients that make calls into the depths
     31  * of the kernel (e.g. at vfs layer) bypassing the syscall layer.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: accessors.c,v 1.3 2016/01/26 23:12:17 pooka Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/kauth.h>
     39 #include <sys/kmem.h>
     40 #include <sys/uio.h>
     41 
     42 #include <rump-sys/kern.h>
     43 
     44 struct uio *
     45 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
     46 {
     47 	struct uio *uio;
     48 	enum uio_rw uiorw;
     49 
     50 	switch (rw) {
     51 	case RUMPUIO_READ:
     52 		uiorw = UIO_READ;
     53 		break;
     54 	case RUMPUIO_WRITE:
     55 		uiorw = UIO_WRITE;
     56 		break;
     57 	default:
     58 		panic("%s: invalid rw %d", __func__, rw);
     59 	}
     60 
     61 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
     62 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
     63 
     64 	uio->uio_iov->iov_base = buf;
     65 	uio->uio_iov->iov_len = bufsize;
     66 
     67 	uio->uio_iovcnt = 1;
     68 	uio->uio_offset = offset;
     69 	uio->uio_resid = bufsize;
     70 	uio->uio_rw = uiorw;
     71 	uio->uio_vmspace = curproc->p_vmspace;
     72 
     73 	return uio;
     74 }
     75 
     76 size_t
     77 rump_uio_getresid(struct uio *uio)
     78 {
     79 
     80 	return uio->uio_resid;
     81 }
     82 
     83 off_t
     84 rump_uio_getoff(struct uio *uio)
     85 {
     86 
     87 	return uio->uio_offset;
     88 }
     89 
     90 size_t
     91 rump_uio_free(struct uio *uio)
     92 {
     93 	size_t resid;
     94 
     95 	resid = uio->uio_resid;
     96 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
     97 	kmem_free(uio, sizeof(*uio));
     98 
     99 	return resid;
    100 }
    101 
    102 kauth_cred_t
    103 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    104 {
    105 	kauth_cred_t cred;
    106 	int rv;
    107 
    108 	cred = kauth_cred_alloc();
    109 	kauth_cred_setuid(cred, uid);
    110 	kauth_cred_seteuid(cred, uid);
    111 	kauth_cred_setsvuid(cred, uid);
    112 	kauth_cred_setgid(cred, gid);
    113 	kauth_cred_setgid(cred, gid);
    114 	kauth_cred_setegid(cred, gid);
    115 	kauth_cred_setsvgid(cred, gid);
    116 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    117 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    118 	assert(rv == 0);
    119 
    120 	return cred;
    121 }
    122 
    123 void
    124 rump_cred_put(kauth_cred_t cred)
    125 {
    126 
    127 	kauth_cred_free(cred);
    128 }
    129