linux-kernel - Re: [PATCH v2 1/3] ima: use ahash API for file hash calculation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 02 Jul 2014 13:44:25 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Dmitry Kasatkin <dmitry.kasatkin@...il.com>
Cc:	linux-ima-devel@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Dmitry Kasatkin <d.kasatkin@...sung.com>
Subject: Re: [PATCH v2 1/3] ima: use ahash API for file hash calculation

On Tue, 2014-07-01 at 23:12 +0300, Dmitry Kasatkin wrote:

> -/*
> - * Calculate the MD5/SHA1 file digest
> - */
> +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) {
> +		tfm = crypto_alloc_ahash(hash_algo_name[algo], 0, 0);

In the case where algo isn't the same as ima_hash_algo, won't this
replace the existing ima_ahash_tfm without freeing it?

Mimi

> +		if (!IS_ERR(tfm)) {
> +			if (algo == ima_hash_algo)
> +				ima_ahash_tfm = tfm;
> +		} else {
> +			rc = PTR_ERR(tfm);
> +			pr_err("Can not allocate %s (reason: %d)\n",
> +			       hash_algo_name[algo], rc);
> +		}
> +	}
> +	return tfm;
> +}
> +
> +static void ima_free_atfm(struct crypto_ahash *tfm)
> +{
> +	if (tfm != ima_ahash_tfm)
> +		crypto_free_ahash(tfm);
> +}



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/