From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752003Ab2KQQiF (ORCPT ); Sat, 17 Nov 2012 11:38:05 -0500 Received: from mail-wg0-f44.google.com ([74.125.82.44]:42423 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751881Ab2KQQiE (ORCPT ); Sat, 17 Nov 2012 11:38:04 -0500 From: Nick Kossifidis To: tytso@mit.edu Cc: linux-kernel@vger.kernel.org, Nick Kossifidis Subject: [PATCH] random: Mix cputime from each thread that exits to the pool Date: Sat, 17 Nov 2012 18:37:29 +0200 Message-Id: <1353170249-1004-1-git-send-email-mickflemm@gmail.com> X-Mailer: git-send-email 1.7.8.6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When a thread exits mix it's cputime (userspace + kernelspace) to the entropy pool. We don't know how "random" this is, so we use add_device_randomness that doesn't mess with entropy count. Signed-off-by: Nick Kossifidis --- kernel/posix-cpu-timers.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index 125cb67..f07827a 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -9,6 +9,7 @@ #include #include #include +#include /* * Called after updating RLIMIT_CPU to run cpu timer and update @@ -494,6 +495,8 @@ static void cleanup_timers(struct list_head *head, */ void posix_cpu_timers_exit(struct task_struct *tsk) { + add_device_randomness((const void*) &tsk->se.sum_exec_runtime, + sizeof(unsigned long long)); cleanup_timers(tsk->cpu_timers, tsk->utime, tsk->stime, tsk->se.sum_exec_runtime); -- 1.7.8.6