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| author | Nick Kossifidis <mickflemm@gmail.com> | 2012-12-17 04:18:11 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-12-17 04:18:11 +0100 |
| commit | 6133705494bb02953e1e2cc3018a4373981b3c97 (patch) | |
| tree | 4c46ef0c3b1c6a3b07a7f98fda0873c4f201934c /kernel/posix-cpu-timers.c | |
| parent | random: prime last_data value per fips requirements (diff) | |
| download | linux-6133705494bb02953e1e2cc3018a4373981b3c97.tar.xz linux-6133705494bb02953e1e2cc3018a4373981b3c97.zip | |
random: Mix cputime from each thread that exits to the pool
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>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'kernel/posix-cpu-timers.c')
| -rw-r--r-- | 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 125cb67daa21..f07827a4e281 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); |