From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934256AbcBDWHK (ORCPT ); Thu, 4 Feb 2016 17:07:10 -0500 Received: from mail-pf0-f177.google.com ([209.85.192.177]:36698 "EHLO mail-pf0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934017AbcBDWHH (ORCPT ); Thu, 4 Feb 2016 17:07:07 -0500 From: Daniel Cashman To: linux-kernel@vger.kernel.org Cc: linux@arm.linux.org.uk, akpm@linux-foundation.org, keescook@chromium.org, tytso@mit.edu, arnd@arndb.de, gregkh@linuxfoundation.org, catalin.marinas@arm.com, will.deacon@arm.com, ralf@linux-mips.org, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, viro@zeniv.linux.org.uk, nnk@google.com, jeffv@google.com, salyzyn@android.com, Daniel Cashman Subject: [PATCH 1/2] drivers: char: random: Add get_random_long(). Date: Thu, 4 Feb 2016 14:06:30 -0800 Message-Id: <1454623591-17951-2-git-send-email-dcashman@android.com> X-Mailer: git-send-email 2.7.0.rc3.207.g0ac5344 In-Reply-To: <1454623591-17951-1-git-send-email-dcashman@android.com> References: <1454623591-17951-1-git-send-email-dcashman@android.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Daniel Cashman --- 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 * * [...... .....] 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