linux-kernel - [PATCH 1/2] drivers: char: random: Add get_random

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Date:	Thu,  4 Feb 2016 14:06:30 -0800
From:	Daniel Cashman <dcashman@...roid.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux@....linux.org.uk, akpm@...ux-foundation.org,
	keescook@...omium.org, tytso@....edu, arnd@...db.de,
	gregkh@...uxfoundation.org, catalin.marinas@....com,
	will.deacon@....com, ralf@...ux-mips.org, benh@...nel.crashing.org,
	paulus@...ba.org, mpe@...erman.id.au, davem@...emloft.net,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, viro@...iv.linux.org.uk, nnk@...gle.com,
	jeffv@...gle.com, salyzyn@...roid.com,
	Daniel Cashman <dcashman@...roid.com>
Subject: [PATCH 1/2] drivers: char: random: Add get_random_long().

Signed-off-by: Daniel Cashman <dcashman@...roid.com>
---
 drivers/char/random.c  | 22 ++++++++++++++++++++++
 include/linux/random.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index d0da5d8..b583e53 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1819,6 +1819,28 @@ unsigned int get_random_int(void)
 EXPORT_SYMBOL(get_random_int);
 
 /*
+ * Same as get_random_int(), but returns unsigned long.
+ */
+unsigned long get_random_long(void)
+{
+	__u32 *hash;
+	unsigned long ret;
+
+	if (arch_get_random_long(&ret))
+		return ret;
+
+	hash = get_cpu_var(get_random_int_hash);
+
+	hash[0] += current->pid + jiffies + random_get_entropy();
+	md5_transform(hash, random_int_secret);
+	ret = *(unsigned long *)hash;
+	put_cpu_var(get_random_int_hash);
+
+	return ret;
+}
+EXPORT_SYMBOL(get_random_long);
+
+/*
  * randomize_range() returns a start address such that
  *
  *    [...... <range> .....]
diff --git a/include/linux/random.h b/include/linux/random.h
index a75840c..9c29122 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -34,6 +34,7 @@ extern const struct file_operations random_fops, urandom_fops;
 #endif
 
 unsigned int get_random_int(void);
+unsigned long get_random_long(void);
 unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
 
 u32 prandom_u32(void);
-- 
2.7.0.rc3.207.g0ac5344