From: Matt Mackall <m...@selenic.com>
-------------------
This is a commit scheduled for the next v2.6.34 longterm release.
http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
If you see a problem with using this for longterm, please comment.
-------------------
commit e954bc91bdd4bb08b8325478c5004b24a23a3522 upstream.
Rather than dynamically allocate 10 bytes, move it to static allocation.
This saves space and avoids the need for error checking.
Signed-off-by: Matt Mackall <m...@selenic.com>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
[PG: adding this simplifies required updates to random for .34 stable]
Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com>
---
drivers/char/random.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index ccdadd9..1e07bbe 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -257,6 +257,7 @@
#define INPUT_POOL_WORDS 128
#define OUTPUT_POOL_WORDS 32
#define SEC_XFER_SIZE 512
+#define EXTRACT_SIZE 10
/*
* The minimum number of bits of entropy before we wake up a read on
@@ -414,7 +415,7 @@ struct entropy_store {
unsigned add_ptr;
int entropy_count;
int input_rotate;
- __u8 *last_data;
+ __u8 last_data[EXTRACT_SIZE];
};
static __u32 input_pool_data[INPUT_POOL_WORDS];
@@ -714,8 +715,6 @@ void add_disk_randomness(struct gendisk *disk)
}
#endif
-#define EXTRACT_SIZE 10
-
/*********************************************************************
*
* Entropy extraction routines
@@ -862,7 +861,7 @@ static ssize_t extract_entropy(struct entropy_store *r,
void *buf,
while (nbytes) {
extract_buf(r, tmp);
- if (r->last_data) {
+ if (fips_enabled) {
spin_lock_irqsave(&r->lock, flags);
if (!memcmp(tmp, r->last_data, EXTRACT_SIZE))
panic("Hardware RNG duplicated output!\n");
@@ -951,9 +950,6 @@ 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)
--
1.7.12.rc2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
