1 /* $NetBSD: rnd_component.c,v 1.6 2020/02/10 07:13:06 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2009 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 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: rnd_component.c,v 1.6 2020/02/10 07:13:06 riastradh Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/conf.h> 33 #include <sys/device.h> 34 #include <sys/rnd.h> 35 #include <sys/stat.h> 36 37 #include <rump-sys/kern.h> 38 #include <rump-sys/dev.h> 39 #include <rump-sys/vfs.h> 40 41 #include "ioconf.h" 42 43 RUMP_COMPONENT(RUMP_COMPONENT_DEV) 44 { 45 extern const struct cdevsw rnd_cdevsw; 46 devmajor_t bmaj, cmaj; 47 int error; 48 49 /* go, mydevfs */ 50 bmaj = cmaj = -1; 51 52 if ((error = devsw_attach("random", NULL, &bmaj, 53 &rnd_cdevsw, &cmaj)) != 0) 54 panic("cannot attach rnd: %d", error); 55 56 if ((error = rump_vfs_makeonedevnode(S_IFCHR, "/dev/random", 57 cmaj, RND_DEV_RANDOM)) != 0) 58 panic("cannot create /dev/random: %d", error); 59 if ((error = rump_vfs_makeonedevnode(S_IFCHR, "/dev/urandom", 60 cmaj, RND_DEV_URANDOM)) != 0) 61 panic("cannot create /dev/urandom: %d", error); 62 63 rump_pdev_add(rndattach, 4); 64 } 65 66 #if 0 67 /* 68 * XXX: the following hack works around PR kern/51135 and should ASAP be 69 * nuked to and then from orbit. 70 */ 71 #define RNDPRELOAD 256 72 #include <sys/rndio.h> 73 RUMP_COMPONENT(RUMP_COMPONENT_POSTINIT) 74 { 75 rnddata_t *rd; 76 size_t dsize, i; 77 78 CTASSERT(RNDPRELOAD <= sizeof(rd->data)); 79 80 aprint_verbose("/dev/random: " 81 "loading initial entropy to workaround PR kern/51135\n"); 82 rd = kmem_alloc(sizeof(*rd), KM_SLEEP); 83 for (i = 0; i < RNDPRELOAD; i += dsize) { 84 if (rumpuser_getrandom(rd->data, 85 RNDPRELOAD-i, RUMPUSER_RANDOM_HARD, &dsize) != 0) 86 panic("rumpuser_getrandom failed"); /* XXX */ 87 rd->len = dsize; 88 rd->entropy = dsize*NBBY; 89 if (rnd_system_ioctl(NULL, RNDADDDATA, rd)) 90 panic("rnd_system_ioctl failed"); /* XXX */ 91 } 92 } 93 #endif 94