svn commit: r280955 - in head/sys: modules/notrandom dev/notrandom

Matteo Riondato

2015-04-01 12:41:25 UTC

Finalmente!

---------- Forwarded message ----------
From: Mateusz Guzik <***@freebsd.org>
Date: Wed, Apr 1, 2015 at 7:36 AM
Subject: svn commit: r280955 - in head/sys: modules/notrandom dev/notrandom
To: src-***@freebsd.org, svn-src-***@freebsd.org,
svn-src-***@freebsd.org

Author: mjg
Date: Wed Apr 1 13:37:00 2015
New Revision: 280955
URL: https://svnweb.freebsd.org/changeset/base/280955

Log:
Add /dev/notrandom

notrandom provides fast and reliable not random numbers.

This was added in an effort to increase feature-compatiblity with
Solaris 10.

See http://www.brendangregg.com/Specials/notrandom.c for Solaris
implementation.

Reviewed-by: Bruce Schneier (ok, not really)
MFC after: 1 week

Added:
head/sys/modules/notrandom/Makefile
head/sys/dev/notrandom/notrandom.c

Added: sys/dev/notrandom/notrandom.c
===================================================================
--- head/sys/dev/notrandom/notrandom.c (revision 0)
+++ head/sys/dev/notrandom/notrandom.c (working copy)
@@ -0,0 +1,126 @@
+/*-
+ * Copyright (c) 2015 Mateusz Guzik
+ * 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
+ * in this position and unchanged.
+ * 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 AUTHORS ``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 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/uio.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/filio.h>
+
+static struct cdev *notrandom_dev;
+
+static d_ioctl_t notrandom_ioctl;
+static d_read_t notrandom_read;
+
+static struct cdevsw notrandom_cdevsw = {
+ .d_version = D_VERSION,
+ .d_read = notrandom_read,
+ .d_ioctl = notrandom_ioctl,
+ .d_name = "notrandom",
+ .d_flags = D_MMAP_ANON,
+};
+
+static char notrandom_buf[1024];
+
+static int
+notrandom_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data __unused,
+ int flags __unused, struct thread *td)
+{
+ int error = 0;
+
+ switch (cmd) {
+ case FIONBIO:
+ break;
+ case FIOASYNC:
+ if (*(int *)data != 0)
+ error = EINVAL;
+ break;
+ default:
+ error = ENOIOCTL;
+ }
+ return (error);
+}
+
+
+/* ARGSUSED */
+static int
+notrandom_read(struct cdev *dev __unused, struct uio *uio, int flags __unused)
+{
+ ssize_t len;
+ int error = 0;
+
+ while (uio->uio_resid > 0 && error == 0) {
+ len = uio->uio_resid;
+ if (len > sizeof(notrandom_buf))
+ len = sizeof(notrandom_buf);
+ error = uiomove(notrandom_buf, len, uio);
+ }
+
+ return (error);
+}
+
+/* ARGSUSED */
+static int
+notrandom_modevent(module_t mod __unused, int type, void *data __unused)
+{
+ int error = 0;
+
+ switch(type) {
+ case MOD_LOAD:
+ memset(notrandom_buf, 7, sizeof(notrandom_buf));
+ notrandom_dev = make_dev_credf(MAKEDEV_ETERNAL_KLD,
+ &notrandom_cdevsw, 0, NULL, UID_ROOT, GID_WHEEL, 0666,
+ "notrandom");
+ break;
+
+ case MOD_UNLOAD:
+ destroy_dev(notrandom_dev);
+ /*
+ * Trash notrandom region so that the content cannot be
+ * retrieved. Better safe than sorry.
+ */
+ memset(notrandom_buf, 123, sizeof(notrandom_buf));
+ break;
+
+ case MOD_SHUTDOWN:
+ break;
+
+ default:
+ error = EOPNOTSUPP;
+ }
+
+ return (error);
+}
+
+DEV_MODULE(notrandom, notrandom_modevent, NULL);
+MODULE_VERSION(notrandom, 1);

Property changes on: head/sys/dev/notrandom/notrandom.c
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Added: svn:eol-style
## -0,0 +1 ##
+native
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+FreeBSD=%H
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Added: svn:mime-type
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+text/plain
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Added: sys/modules/notrandom/Makefile
===================================================================
--- head/sys/modules/notrandom/Makefile (revision 0)
+++ head/sys/modules/notrandom/Makefile (working copy)
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../dev/notrandom
+
+KMOD= notrandom
+SRCS= notrandom.c
+
+.include <bsd.kmod.mk>

Property changes on: head/sys/modules/notrandom/Makefile
___________________________________________________________________
Added: svn:eol-style
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+native
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Added: svn:keywords
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+FreeBSD=%H
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Added: svn:mime-type
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+text/plain
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