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 44struct uio * 45rump_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 76size_t 77rump_uio_getresid(struct uio *uio) 78{ 79 80 return uio->uio_resid; 81} 82 83off_t 84rump_uio_getoff(struct uio *uio) 85{ 86 87 return uio->uio_offset; 88} 89 90size_t 91rump_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 102kauth_cred_t 103rump_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 123void 124rump_cred_put(kauth_cred_t cred) 125{ 126 127 kauth_cred_free(cred); 128} 129