Messages in this thread Patch in this message | | | From | Nick Kossifidis <> | Subject | [PATCH] random: Mix cputime from each thread that exits to the pool | Date | Sat, 17 Nov 2012 18:37:29 +0200 |
| |
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 <mickflemm@gmail.com> --- 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 <asm/uaccess.h> #include <linux/kernel_stat.h> #include <trace/events/timer.h> +#include <linux/random.h> /* * 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
| |