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

Eric Sandeen
2007-12-18T15:51:37Z

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@redhat.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,