random: make 'add_interrupt_randomness()' do something sane

We've been moving away from add_interrupt_randomness() for various
reasons: it's too expensive to do on every interrupt, and flooding the
CPU with interrupts could theoretically cause bogus floods of entropy
from a somewhat externally controllable source.

This solves both problems by limiting the actual randomness addition
to just once a second or after 64 interrupts, whicever comes first.
During that time, the interrupt cycle data is buffered up in a per-cpu
pool.  Also, we make sure the the nonblocking pool used by urandom is
initialized before we start feeding the normal input pool.  This
assures that /dev/urandom is returning unpredictable data as soon as
possible.

(Based on an original patch by Linus, but significantly modified by
tytso.)

Tested-by: Eric Wustrow <ewust@umich.edu>
Reported-by: Eric Wustrow <ewust@umich.edu>
Reported-by: Nadia Heninger <nadiah@cs.ucsd.edu>
Reported-by: Zakir Durumeric <zakir@umich.edu>
Reported-by: J. Alex Halderman <jhalderm@umich.edu>.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org

1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index bdb180325551..131ca176b497 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -133,7 +133,7 @@ irqreturn_t
 handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action)
 {
         irqreturn_t retval = IRQ_NONE;
-        unsigned int random = 0, irq = desc->irq_data.irq;
+        unsigned int flags = 0, irq = desc->irq_data.irq;
 
         do {
                 irqreturn_t res;
@@ -161,7 +161,7 @@ handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action)
 
                         /* Fall through to add to randomness */
                 case IRQ_HANDLED:
-                        random |= action->flags;
+                        flags |= action->flags;
                         break;
 
                 default:
@@ -172,8 +172,7 @@ handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action)
                 action = action->next;
         } while (action);
 
-        if (random & IRQF_SAMPLE_RANDOM)
-                add_interrupt_randomness(irq);
+        add_interrupt_randomness(irq, flags);
 
         if (!noirqdebug)
                 note_interrupt(irq, desc, retval);