linux-kernel - Re: [PATCH v3] crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate

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Message-ID: <aO0dJeqb9E99xVvD@wunner.de>
Date: Mon, 13 Oct 2025 17:39:17 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Thorsten Blum <thorsten.blum@...ux.dev>
Cc: David Howells <dhowells@...hat.com>,
	Ignat Korchagin <ignat@...udflare.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Vivek Goyal <vgoyal@...hat.com>, keyrings@...r.kernel.org,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] crypto: asymmetric_keys - prevent overflow in
 asymmetric_key_generate_id

On Mon, Oct 13, 2025 at 01:40:10PM +0200, Thorsten Blum wrote:
> Use check_add_overflow() to guard against potential integer overflows
> when adding the binary blob lengths and the size of an asymmetric_key_id
> structure and return ERR_PTR(-EOVERFLOW) accordingly. This prevents a
> possible buffer overflow when copying data from potentially malicious
> X.509 certificate fields that can be arbitrarily large, such as ASN.1
> INTEGER serial numbers, issuer names, etc.
> 
> Fixes: 7901c1a8effb ("KEYS: Implement binary asymmetric key ID handling")
> Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>

Reviewed-by: Lukas Wunner <lukas@...ner.de>