linux-kernel - /dev/urandom uses uninit bytes, leaks user data

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Message-ID: <977119.41267.qm@web52005.mail.re2.yahoo.com>
Date:	Fri, 14 Dec 2007 23:20:30 -0800 (PST)
From:	Matti Linnanvuori <mattilinnanvuori@...oo.com>
To:	linux-kernel@...r.kernel.org
Subject: /dev/urandom uses uninit bytes, leaks user data

From: Matti Linnanvuori <mattilinnnvuori@...oo.com>

/dev/urandom use no uninit bytes, leak no user data

Signed-off-by: Matti Linnanvuori <mattilinnnvuori@...oo.com>

---

--- a/drivers/char/random.c	2007-12-15 09:09:37.895414000 +0200
+++ b/drivers/char/random.c	2007-12-15 09:12:02.607831500 +0200
@@ -689,7 +689,7 @@ static ssize_t extract_entropy(struct en
  */
 static void xfer_secondary_pool(struct entropy_store *r, size_t nbytes)
 {
-	__u32 tmp[OUTPUT_POOL_WORDS];
+	static __u32 tmp[OUTPUT_POOL_WORDS];
 
 	if (r->pull && r->entropy_count < nbytes * 8 &&
 	    r->entropy_count < r->poolinfo->POOLBITS) {




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