From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-171.mta1.migadu.com (out-171.mta1.migadu.com [95.215.58.171]) (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 9674B2DB7B4; Mon, 3 Aug 2026 12:02:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785758537; cv=none; b=KTD/fNrMwod2R997h21d6LPw21bAulyCVqpgfzLzZVQjYdVfr9iovPkjBX7jlfKp02j3h5w2OXUVjzRNYNFtvO1fgWQZEDz2GH1RjM+Guj1vg0J7m88h+wBkE2Op47IupzSgAcXHa+Ay+OJ2YhEeiyUvtxkqVWTRDjUfgxyw3xY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785758537; c=relaxed/simple; bh=uPSvFy7P+QFSiwZBSzTMTlUAthCnrZKn7ag0MqcBlBM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=GpoAc/jv8JFagC+rtpKPybKOBhGvZU4aEGQuh/qpVN1mW8YouqkaKdkgmIywdm0rNM8/0EqqgPFW6eg5KLXwLS7xwiB06BhO1oGyDKYx5wde1zrb9Mjq/tIpnxkYLYwBBwvjErjqvRH/zkUan/Jp79XQmHFMKFjK5eOHKN1arkE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=EnouUtAw; arc=none smtp.client-ip=95.215.58.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="EnouUtAw" Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1785758532; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=52EZk8YPwTy+jG8rvfx/kfwJ0amdCbdlhZF4BPxa9n0=; b=EnouUtAwmdUyiYMkNZYeTEKz+AWGqvGLFPzrRg2VSPbHDC6HVF7FROS4eLHrg3gT8tooRk rig62DQPA5EaSsWXf6iA3G0v/XDaJ6BmV1oe49+5hzRGn2f3z2n2yirXt1Il6HlfYyxdck yb7BufJLbG3lqJtL+aY1dN0OwdZGnlw= Date: Mon, 3 Aug 2026 20:00:32 +0800 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH 0/4] CRASH_ZEROIZE: Wipe secrets before kdump To: David Howells Cc: =?UTF-8?Q?Jan_Sebastian_G=C3=B6tte?= , Baoquan He , Andrew Morton , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , Jarkko Sakkinen , Paul Moore , James Morris , "Serge E. Hallyn" , Mimi Zohar , James Bottomley , Rob Herring , Saravana Kannan , Coiby Xu , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, keyrings@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, Tao Liu References: <79610b53-5201-4af3-913a-0c4dcbb6f9d6@linux.dev> <20260731154608.153258-1-linux@jaseg.de> <74625f78-15ea-439f-b9f0-939d2976fa7f@jaseg.de> <2490025.1785751199@warthog.procyon.org.uk> Content-Language: en-US X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Dave Young In-Reply-To: <2490025.1785751199@warthog.procyon.org.uk> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 8/3/26 5:59 PM, David Howells wrote: > Dave Young wrote: > >> Cleaning up secret data can be done with makedumpfile + eppic scripts (see >> the manual of makedumpfile), or it is even possible to do so in kdump kernel >> with Tao Liu's improvments for makedumpfile previously (I don't know the >> status, probably dropped for the time being, but it is possible, cced him). > > Does this represent a leak of the secrets? Also do governmental > standardisation bodies have opinions on what constitutes a leak? It depends, for the crash case I'm not against to clear sensitive data, the concern is to avoid extra complexity of logic pre-kdump. Which government? Sorry I can not answer here. > > David >