From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4554E2E62A8 for ; Mon, 26 Jan 2026 21:37:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769463432; cv=none; b=kDrJDdJh4GpsiE8sQGNAaSgPNVempalOr5gBnakHX0WYgvBZmGWE9PXkhpy2/sVFHm848Rxmz1XmXZJbaR1Sd7Kvxlj1cl+nxcTJMEalpAPDwm3P+eHRUxyd7mM7rf32clG1y2mE4UEnHUT91TIomeXKepZ210lnLR8bwO0HkcA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769463432; c=relaxed/simple; bh=0hWe7eQ4HIAf6/j5HOv37+1vd+FYqSwe0P+LEC7HsfQ=; h=From:In-Reply-To:References:To:Cc:Subject:MIME-Version: Content-Type:Date:Message-ID; b=X1rAcbQkkxmk6oVua6iPYqTZluxmm+JyOS4wrQHbehy0wdr05KMnTUuUopbYYdldq3vqUg0nOCEoJmJ9bF/oZiWbf6JpsmRbh3XidYL0KS0m2w6Fnlx4KFgZAVXfMS1XQqgBKny/9rzAEsVYrd3Alhvrk4Ixbe/dvNpgxYYskvs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=VyJcrakV; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="VyJcrakV" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769463430; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=FuGQCOqf9yOzW+ft8te/e4xxRm2OgzH1ppkEP0d7iLg=; b=VyJcrakVFtvYwYtGuk4m7+1fPDnKA6CR0a7Vvx1tA/6XdH+syURXUdt7DtEUYuq7zAo1Je bnop4QYGQRhwn0A+kEPQkB7KPrB7jvHYj6Hj/2L2OR2wXGtxxZn/Uq8SjH2LtyTsM5evGD Am7UsxCa6xbwA8drhkbqA49eZFHsxBM= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-512-bh118hx4PqOesZMsNWSXsw-1; Mon, 26 Jan 2026 16:37:06 -0500 X-MC-Unique: bh118hx4PqOesZMsNWSXsw-1 X-Mimecast-MFC-AGG-ID: bh118hx4PqOesZMsNWSXsw_1769463425 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 30ADA19775A5; Mon, 26 Jan 2026 21:37:05 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.44.33.164]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 5C9851956095; Mon, 26 Jan 2026 21:37:01 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <821cb2becf70b2dcb903e74685643f8b60a5cbb6.camel@linux.ibm.com> References: <821cb2becf70b2dcb903e74685643f8b60a5cbb6.camel@linux.ibm.com> <1783975.1769190197@warthog.procyon.org.uk> To: Mimi Zohar Cc: dhowells@redhat.com, Simo Sorce , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Eric Biggers , linux-integrity@vger.kernel.org, linux-crypto@vger.kernel.org, keyrings@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: IMA and PQC Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1988759.1769463419.1@warthog.procyon.org.uk> Date: Mon, 26 Jan 2026 21:36:59 +0000 Message-ID: <1988760.1769463419@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Mimi Zohar wrote: > > Further, we need to think how we're going to do PQC support in IMA - > > particularly as the signatures are so much bigger and verification slower. > > Perhaps, but these same reasons would apply to kernel modules, firmware, and > the kernel image. Why would IMA be special?! Scale. I wouldn't expect more than a couple of hundred or so kernel module and firmware signatures - and, for the most part, that would be done once during boot. On the other hand, I'm assuming that a lot more IMA signatures might need checking and maybe more frequently. David