Date: Wed, 27 Feb 2013 22:02:41 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r247423 - stable/9/sys/kern Message-ID: <201302272202.r1RM2f6P021968@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: jhb Date: Wed Feb 27 22:02:40 2013 New Revision: 247423 URL: http://svnweb.freebsd.org/changeset/base/247423 Log: MFC 240921: 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. Modified: stable/9/sys/kern/kern_intr.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/kern/kern_intr.c ============================================================================== --- stable/9/sys/kern/kern_intr.c Wed Feb 27 21:58:06 2013 (r247422) +++ stable/9/sys/kern/kern_intr.c Wed Feb 27 22:02:40 2013 (r247423) @@ -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,
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201302272202.r1RM2f6P021968>