linux-kernel - [PATCH] ecryptfs: fix string overflow on long cipher names

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Message-ID: <4767EC73.2030507@redhat.com>
Date:	Tue, 18 Dec 2007 09:51:15 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Halcrow <mhalcrow@...ibm.com>
CC:	mike@...crow.us, Jarod Wilson <jwilson@...hat.com>
Subject: [PATCH] ecryptfs: fix string overflow on long cipher names

Passing a cipher name > 32 chars on mount results in an overflow
when the cipher name is printed, because the last character
in the struct ecryptfs_key_tfm's cipher_name string was never 
zeroed.

Signed-off-by: Eric Sandeen <sandeen@...hat.com>

---

Index: linux-2.6.24-rc3/fs/ecryptfs/crypto.c
===================================================================
--- linux-2.6.24-rc3.orig/fs/ecryptfs/crypto.c
+++ linux-2.6.24-rc3/fs/ecryptfs/crypto.c
@@ -1847,6 +1847,7 @@ ecryptfs_add_new_key_tfm(struct ecryptfs
 	mutex_init(&tmp_tfm->key_tfm_mutex);
 	strncpy(tmp_tfm->cipher_name, cipher_name,
 		ECRYPTFS_MAX_CIPHER_NAME_SIZE);
+	tmp_tfm->cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
 	tmp_tfm->key_size = key_size;
 	rc = ecryptfs_process_key_cipher(&tmp_tfm->key_tfm,
 					 tmp_tfm->cipher_name,



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