xnu-3789.1.32.tar.gz

[apple/xnu.git] / bsd / dev / random / randomdev.c

diff --git a/bsd/dev/random/randomdev.c b/bsd/dev/random/randomdev.c
index 1b96f774c029af9c8c28ea0c87d87dafe967247a..6482f6094013a304eaf6166a1f997a936078a036 100644 (file)
--- a/bsd/dev/random/randomdev.c
+++ b/bsd/dev/random/randomdev.c
@@ -2,7 +2,7 @@
  * Copyright (c) 1999-2009 Apple, Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- * 
+ *
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
@@ -11,10 +11,10 @@
  * unlawful or unlicensed copies of an Apple operating system, or to
  * circumvent, violate, or enable the circumvention or violation of, any
  * terms of an Apple operating system software license agreement.
- * 
+ *
  * Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this file.
- * 
+ *
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
@@ -22,7 +22,7 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
- * 
+ *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
@@ -40,6 +40,7 @@
 #include <kern/clock.h>
 #include <sys/time.h>
 #include <sys/malloc.h>
+#include <sys/sysproto.h>
 #include <sys/uio_internal.h>
 
 #include <dev/random/randomdev.h>
@@ -96,7 +97,7 @@ random_init(void)
                UID_ROOT, GID_WHEEL, 0666, "random", 0);
 
        /*
-        * also make urandom 
+        * also make urandom
         * (which is exactly the same thing in our context)
         */
        devfs_make_node(makedev (ret, URANDOM_MINOR), DEVFS_CHAR,
@@ -105,7 +106,7 @@ random_init(void)
 }
 
 int
-random_ioctl(  __unused dev_t dev, u_long cmd, __unused caddr_t data, 
+random_ioctl(  __unused dev_t dev, u_long cmd, __unused caddr_t data,
                                __unused int flag, __unused struct proc *p  )
 {
        switch (cmd) {
@@ -123,7 +124,7 @@ random_ioctl(       __unused dev_t dev, u_long cmd, __unused caddr_t data,
  * Open the device.  Make sure init happened, and make sure the caller is
  * authorized.
  */
- 
+
 int
 random_open(__unused dev_t dev, int flags, __unused int devtype, __unused struct proc *p)
 {
@@ -147,7 +148,7 @@ random_open(__unused dev_t dev, int flags, __unused int devtype, __unused struct
 /*
  * close the device.
  */
- 
+
 int
 random_close(__unused dev_t dev, __unused int flags, __unused int mode, __unused struct proc *p)
 {
@@ -187,7 +188,7 @@ random_write (dev_t dev, struct uio *uio, __unused int ioflag)
 
 /*
  * return data to the caller.  Results unpredictable.
- */ 
+ */
 int
 random_read(__unused dev_t dev, struct uio *uio, __unused int ioflag)
 {
@@ -199,14 +200,14 @@ random_read(__unused dev_t dev, struct uio *uio, __unused int ioflag)
                int bytesToRead = MIN(bytes_remaining,
                                      (user_ssize_t) sizeof(buffer));
                read_random(buffer, bytesToRead);
-                       
+
                retCode = uiomove(buffer, bytesToRead, uio);
                if (retCode != 0)
                        break;
-               
+
                bytes_remaining = uio_resid(uio);
        }
-    
+
        return retCode;
 }
 
@@ -221,3 +222,21 @@ RandomULong(void)
        return (buf);
 }
 
+
+int
+getentropy(__unused struct proc * p, struct getentropy_args *gap, __unused int * ret) {
+       user_addr_t user_addr;
+       uint32_t user_size;
+       char buffer[256];
+
+       user_addr = (vm_map_offset_t)gap->buffer;
+       user_size = gap->size;
+       /* Can't request more than 256 random bytes
+        * at once. Complying with openbsd getentropy()
+        */
+       if (user_size > sizeof(buffer)) {
+               return EINVAL;
+       }
+       read_random(buffer, user_size);
+       return copyout(buffer, user_addr, user_size);
+}