linux-kernel - Re: [RFC][PATCH v3 6/6] eCryptfs: added support for the encrypted key type

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, 26 Jan 2011 11:28:36 +0000
From:	David Howells <dhowells@...hat.com>
To:	Roberto Sassu <roberto.sassu@...ito.it>
Cc:	dhowells@...hat.com, linux-security-module@...r.kernel.org,
	keyrings@...ux-nfs.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, jmorris@...ei.org,
	zohar@...ux.vnet.ibm.com, safford@...son.ibm.com,
	ramunno@...ito.it, tyhicks@...ux.vnet.ibm.com,
	kirkland@...onical.com
Subject: Re: [RFC][PATCH v3 6/6] eCryptfs: added support for the encrypted key type

Roberto Sassu <roberto.sassu@...ito.it> wrote:

>  	(*auth_tok_key) = request_key(&key_type_user, sig, NULL);
>  	if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
> -		printk(KERN_ERR "Could not find key with description: [%s]\n",
> -		       sig);
> -		rc = process_request_key_err(PTR_ERR(*auth_tok_key));
> -		goto out;
> +		(*auth_tok_key) = ecryptfs_get_encrypted_key(sig);
> +		if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
> +			printk(KERN_ERR "Could not find key with description: [%s]\n",
> +			      sig);
> +			rc = process_request_key_err(PTR_ERR(*auth_tok_key));
> +			goto out;
> +		}
>  	}
>  	(*auth_tok) = ecryptfs_get_key_payload_data(*auth_tok_key);
>  	if (ecryptfs_verify_version((*auth_tok)->version)) {

You need some locking here, even if it's only use of the RCU read lock.
Encrypted-type keys have an update method and so may change under you.

David
---
--
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/