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Koen Kooi
df420fe6fd
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com> Signed-off-by: Denys Dmytriyenko <denis@denix.org>
50 lines
1.5 KiB
Diff
50 lines
1.5 KiB
Diff
From 5633ed2c64b766f280942d8c0906f7ae77cf2c20 Mon Sep 17 00:00:00 2001
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From: Theodore Ts'o <tytso@mit.edu>
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Date: Thu, 22 Dec 2011 16:28:01 -0500
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Subject: [PATCH 12/70] random: Use arch-specific RNG to initialize the
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entropy store
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commit 3e88bdff1c65145f7ba297ccec69c774afe4c785 upstream.
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If there is an architecture-specific random number generator (such as
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RDRAND for Intel architectures), use it to initialize /dev/random's
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entropy stores. Even in the worst case, if RDRAND is something like
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AES(NSA_KEY, counter++), it won't hurt, and it will definitely help
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against any other adversaries.
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Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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Link: http://lkml.kernel.org/r/1324589281-31931-1-git-send-email-tytso@mit.edu
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Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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drivers/char/random.c | 6 ++++++
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1 files changed, 6 insertions(+), 0 deletions(-)
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diff --git a/drivers/char/random.c b/drivers/char/random.c
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index 85da874..3079477 100644
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--- a/drivers/char/random.c
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+++ b/drivers/char/random.c
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@@ -965,6 +965,7 @@ EXPORT_SYMBOL(get_random_bytes);
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*/
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static void init_std_data(struct entropy_store *r)
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{
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+ int i;
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ktime_t now;
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unsigned long flags;
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@@ -974,6 +975,11 @@ static void init_std_data(struct entropy_store *r)
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now = ktime_get_real();
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mix_pool_bytes(r, &now, sizeof(now));
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+ for (i = r->poolinfo->poolwords; i; i--) {
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+ if (!arch_get_random_long(&flags))
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+ break;
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+ mix_pool_bytes(r, &flags, sizeof(flags));
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+ }
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mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
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}
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--
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1.7.7.6
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