linux-kernel - [tip:x86/urgent] random: Fix handing of arch_get_random_long in get_random

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Message-ID: <tip-0d2f096b8785b67c38afcf6e1fbb9674af2e05ca@git.kernel.org>
Date:	Fri, 18 Nov 2011 15:45:57 -0800
From:	"tip-bot for Luck, Tony" <tony.luck@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tony.luck@...el.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/urgent] random: Fix handing of arch_get_random_long in get_random_bytes()

Commit-ID:  0d2f096b8785b67c38afcf6e1fbb9674af2e05ca
Gitweb:     http://git.kernel.org/tip/0d2f096b8785b67c38afcf6e1fbb9674af2e05ca
Author:     Luck, Tony <tony.luck@...el.com>
AuthorDate: Wed, 16 Nov 2011 10:50:56 -0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Wed, 16 Nov 2011 16:41:02 -0800

random: Fix handing of arch_get_random_long in get_random_bytes()

If there is an architecture-specific random number generator we use
it to acquire randomness one "long" at a time. We should put these
random words into consecutive words in the result buffer - not just
overwrite the first word again and again.

Signed-off-by: Tony Luck <tony.luck@...el.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/4ec4061010261a4cb0@agluck-desktop.sc.intel.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 drivers/char/random.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 63e19ba..6035ab8 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -941,7 +941,7 @@ void get_random_bytes(void *buf, int nbytes)
 		if (!arch_get_random_long(&v))
 			break;
 		
-		memcpy(buf, &v, chunk);
+		memcpy(p, &v, chunk);
 		p += chunk;
 		nbytes -= chunk;
 	}
--
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