linux-kernel - Re: [AppArmor 39/41] AppArmor: Profile loading and manipulation, pathname matching

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Message-ID: <20070412112852.49819a73@the-village.bc.nu>
Date:	Thu, 12 Apr 2007 11:28:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	jjohansen@...e.de
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chrisw@...s-sol.org,
	John Johansen <jjohansen@...e.de>,
	Andreas Gruenbacher <agruen@...e.de>
Subject: Re: [AppArmor 39/41] AppArmor: Profile loading and manipulation,
 pathname matching

> +	th.td_id = ntohs(*(u16 *) (blob));
> +	th.td_flags = ntohs(*(u16 *) (blob + 2));
> +	th.td_lolen = ntohl(*(u32 *) (blob + 8));

Use cpu_to and _to_cpu functions for here so it is clear the intended
direction and endianness.

> +
> +static inline int aa_inbounds(struct aa_ext *e, size_t size)
> +{
> +	return (e->pos + size <= e->end);
> +}

Can e->pos + size ever overflow. If so this check isn't safe.


> + * aa_unpack_profile - unpack a serialized profile
> + * @e: serialized data extent information
> + * @error: error code returned if unpacking fails
> + */
> +static struct aa_profile *aa_unpack_profile(struct aa_ext *e)
> +{
> +	struct aa_profile *profile = NULL;
> +

> +	/* get optional subprofiles */
> +	if (aa_is_nameX(e, AA_LIST, "hats")) {
> +		while (!aa_is_nameX(e, AA_LISTEND, NULL)) {
> +			struct aa_profile *subprofile;
> +			subprofile = aa_unpack_profile(e);
> +			if (IS_ERR(subprofile)) {

What bounds recursion here on invalid input ?

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