From cabd8b8de74ed56244621b305e859bf472197ae1 Mon Sep 17 00:00:00 2001 From: jhb Date: Tue, 25 Sep 2012 14:55:46 +0000 Subject: [PATCH] Add optional entropy harvesting for software interrupts in swi_sched() as controlled by kern.random.sys.harvest.swi. SWI harvesting feeds into the interrupt FIFO and each event is estimated as providing a single bit of entropy. Reviewed by: markm, obrien MFC after: 2 weeks --- sys/kern/kern_intr.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c index 8e7ac1fc3e23..bce23972b1df 100644 --- a/sys/kern/kern_intr.c +++ b/sys/kern/kern_intr.c @@ -1144,11 +1144,21 @@ swi_sched(void *cookie, int flags) { struct intr_handler *ih = (struct intr_handler *)cookie; struct intr_event *ie = ih->ih_event; + struct intr_entropy entropy; int error; CTR3(KTR_INTR, "swi_sched: %s %s need=%d", ie->ie_name, ih->ih_name, ih->ih_need); + if (harvest.swi) { + CTR2(KTR_INTR, "swi_sched: pid %d (%s) gathering entropy", + curproc->p_pid, curthread->td_name); + entropy.event = (uintptr_t)ih; + entropy.td = curthread; + random_harvest(&entropy, sizeof(entropy), 1, 0, + RANDOM_INTERRUPT); + } + /* * Set ih_need for this handler so that if the ithread is already * running it will execute this handler on the next pass. Otherwise,