random: Add optional continuous repetition test to entropy store based rngs

FIPS-140 requires that all random number generators implement continuous self
tests in which each extracted block of data is compared against the last block
for repetition.  The ansi_cprng implements such a test, but it would be nice if
the hw rng's did the same thing.  Obviously its not something thats always
needed, but it seems like it would be a nice feature to have on occasion. I've
written the below patch which allows individual entropy stores to be flagged as
desiring a continuous test to be run on them as is extracted.  By default this
option is off, but is enabled in the event that fips mode is selected during
bootup.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 8c7444857a4b..d8a9255e1a3f 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -240,6 +240,7 @@
 #include <linux/spinlock.h>
 #include <linux/percpu.h>
 #include <linux/cryptohash.h>
+#include <linux/fips.h>
 
 #ifdef CONFIG_GENERIC_HARDIRQS
 # include <linux/irq.h>
@@ -413,6 +414,7 @@ struct entropy_store {
         unsigned add_ptr;
         int entropy_count;
         int input_rotate;
+        __u8 *last_data;
 };
 
 static __u32 input_pool_data[INPUT_POOL_WORDS];
@@ -852,12 +854,21 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf,
 {
         ssize_t ret = 0, i;
         __u8 tmp[EXTRACT_SIZE];
+        unsigned long flags;
 
         xfer_secondary_pool(r, nbytes);
         nbytes = account(r, nbytes, min, reserved);
 
         while (nbytes) {
                 extract_buf(r, tmp);
+
+                if (r->last_data) {
+                        spin_lock_irqsave(&r->lock, flags);
+                        if (!memcmp(tmp, r->last_data, EXTRACT_SIZE))
+                                panic("Hardware RNG duplicated output!\n");
+                        memcpy(r->last_data, tmp, EXTRACT_SIZE);
+                        spin_unlock_irqrestore(&r->lock, flags);
+                }
                 i = min_t(int, nbytes, EXTRACT_SIZE);
                 memcpy(buf, tmp, i);
                 nbytes -= i;
@@ -940,6 +951,9 @@ static void init_std_data(struct entropy_store *r)
         now = ktime_get_real();
         mix_pool_bytes(r, &now, sizeof(now));
         mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
+        /* Enable continuous test in fips mode */
+        if (fips_enabled)
+                r->last_data = kmalloc(EXTRACT_SIZE, GFP_KERNEL);
 }
 
 static int rand_initialize(void)