Commit 9a8d289f authored by Mimi Zohar's avatar Mimi Zohar

ima: fix ima_alloc_atfm()

The patch 3bcced39: "ima: use ahash API for file hash
calculation" from Feb 26, 2014, leads to the following static checker
warning:

security/integrity/ima/ima_crypto.c:204 ima_alloc_atfm()
         error: buffer overflow 'hash_algo_name' 17 <= 17

Unlike shash tfm memory, which is allocated on initialization, the
ahash tfm memory allocation is deferred until needed.

This patch fixes the case where ima_ahash_tfm has not yet been
allocated and the file's signature/hash xattr contains an invalid hash
algorithm.  Although we can not verify the xattr, we still need to
measure the file.  Use the default IMA hash algorithm.

Changelog:
- set valid algo before testing tfm - based on Dmitry's comment
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: default avatarDmitry Kasatkin <d.kasatkin@samsung.com>
parent fbff6610
......@@ -200,7 +200,10 @@ static struct crypto_ahash *ima_alloc_atfm(enum hash_algo algo)
struct crypto_ahash *tfm = ima_ahash_tfm;
int rc;
if ((algo != ima_hash_algo && algo < HASH_ALGO__LAST) || !tfm) {
if (algo < 0 || algo >= HASH_ALGO__LAST)
algo = ima_hash_algo;
if (algo != ima_hash_algo || !tfm) {
tfm = crypto_alloc_ahash(hash_algo_name[algo], 0, 0);
if (!IS_ERR(tfm)) {
if (algo == ima_hash_algo)
......
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