Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Tue,  6 Jun 2017 02:50:59 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Theodore Ts'o <tytso@....edu>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-hardening@...ts.openwall.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Miller <davem@...emloft.net>
Cc: "Jason A. Donenfeld" <Jason@...c4.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH v3 04/13] crypto/rng: ensure that the RNG is ready before using

Otherwise, we might be seeding the RNG using bad randomness, which is
dangerous.

Cc: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 crypto/rng.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/crypto/rng.c b/crypto/rng.c
index f46dac5288b9..e042437e64b4 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -48,12 +48,14 @@ int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
 		if (!buf)
 			return -ENOMEM;
 
-		get_random_bytes(buf, slen);
+		err = get_random_bytes_wait(buf, slen);
+		if (err)
+			goto out;
 		seed = buf;
 	}
 
 	err = crypto_rng_alg(tfm)->seed(tfm, seed, slen);
-
+out:
 	kzfree(buf);
 	return err;
 }
-- 
2.13.0

Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.