linux-kernel - Re: [PATCH] KEYS: encrypted: avoid encrypting/decrypting stack buffers

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Message-ID: <20170403182157.GC72831@gmail.com>
Date:   Mon, 3 Apr 2017 11:21:57 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:     keyrings@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Eric Biggers <ebiggers@...gle.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] KEYS: encrypted: avoid encrypting/decrypting stack
 buffers

On Mon, Apr 03, 2017 at 11:55:42AM -0400, Mimi Zohar wrote:
> 
> This patch removes calculating the "padlen".  Will this change break
> other use cases?
> 

No, the number of bytes being encrypted is still 'encrypted_datalen' which is
passed to skcipher_request_set_crypt().  It's okay if the input scatterlist is
longer than that; only the first 'encrypted_datalen' bytes will be used.

- Eric