linux-kernel - Re: [RFC v2 4/7] modsig: add integrity_module

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Date:	Tue, 04 Sep 2012 08:36:28 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	zohar@...ux.vnet.ibm.com, jmorris@...ei.org, dhowells@...hat.com,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 4/7] modsig: add integrity_module_check hook

Dmitry Kasatkin <dmitry.kasatkin@...el.com> writes:
> +#else
> +static inline int integrity_module_check(const void *buf, unsigned long len)
> +{
> +	return 0;
> +}
> +#endif

...

> +	err = integrity_module_check(hdr, len);
> +	if (err < 0)
> +		goto free_hdr;
> +
> +	/* cut signature tail */
> +	info->len = err;

This is a bug.

Firstly, you want the 'long' not 'int' as the return vale from
integrity_module_check().  But mainly, you want it to return 'len' not
0.

I'd also prefer it to be *immediately* after we copy from userspace.

Cheers,
Rusty.
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