From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5A0F5C5DF93 for ; Fri, 21 Aug 2026 14:28:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1BF7B6B0095; Fri, 21 Aug 2026 10:28:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 196656B009B; Fri, 21 Aug 2026 10:28:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 085966B009F; Fri, 21 Aug 2026 10:28:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id DB1EF6B0095 for ; Fri, 21 Aug 2026 10:28:43 -0400 (EDT) Received: from smtpin22.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 4C3D9C0158 for ; Fri, 21 Aug 2026 14:28:43 +0000 (UTC) X-FDA: 85125507726.22.FA19E9E Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf17.hostedemail.com (Postfix) with ESMTP id 5B2F640010 for ; Fri, 21 Aug 2026 14:28:41 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="Mr2/hBrM"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1787322521; h=from:from:sender: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:dkim-signature; bh=d5z1Xu44las/mDWEQ2T0kdUfLaS63+SXiGlCJ/8yslI=; b=Lx+jWXjdk4ilJQekLqtU/rDaoMFzX0FRLMYElrzO69Lb6BI+MW87UwrSBNyCs472S4v+B2 E8YprgPFahJjFJhJv4Vu3odX9dJjLzyTwC3cv+Sv3L6YNRknUjlkIfmEwE0KOZ03pqW80o 8DQ3xty8h30f3BFcU5HkVtzQvH3y6sE= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b="Mr2/hBrM"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1787322521; b=WE1e1hK6rhdFjkwP2es2kLJAjlk9qHJ19ML5d3ywpe8WGymDEd9PFtIpGoy3IQOS6kFCTv 0dVDN1sl2phcC5aTEpuA6T2KY1L8oVyz9Qhn9jdztRdA6YmMY91YCeR4JAKMeEdIGF/3B2 y/0Qf02xhcOo/BMAsu773six4oavSEo= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8280941ABE; Fri, 21 Aug 2026 14:28:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id ABEA31F000E9; Fri, 21 Aug 2026 14:28:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787322520; bh=d5z1Xu44las/mDWEQ2T0kdUfLaS63+SXiGlCJ/8yslI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Mr2/hBrMzoTPSYtphivjAOk+c376Vhf1pdY/u4HkJUIejQD3832wDBOi8Uh04AO4f FUEomt4r+BafWW5sy9NLQXGOGUaRUmZEIeRXz1/FonNBwrOpQ12dArbcJwvgvwg5KB RrpmYzUHE6p8gvQpfI8Cw1NcCmob0MYGTeNgtDevUc/pgpDl3VbBul3rldQDV9hOpL 7D3VdLVMaf+uVk5Y2QqYI7XW64dwP0C2hdOTYoppVO2au58/cPxr9atazx8//IBbnb U8ioRwHSBSqX1lzD3XH+nQkr8KCPnAZLHdq1kPbSzX0kHYu8Lq9Yx1Ub3OGpWzfGIh 6eb/gonUzFE6Q== Message-ID: <75708479-ae55-4297-888d-fe0b609ee26b@kernel.org> Date: Fri, 21 Aug 2026 16:28:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/4] mm/secretmem: zeroize secret pages before kdump To: =?UTF-8?Q?Jan_Sebastian_G=C3=B6tte?= , =?UTF-8?Q?Jan_Sebastian_G=C3=B6tte?= Cc: 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 References: <20260731162739.158320-1-linux@jaseg.de> <20260731162739.158320-4-linux@jaseg.de> <70c578dc-769f-465f-a146-4a4695f747c1@kernel.org> <8bb53d9a-8870-410c-9a41-f8b536ef0780@kernel.org> <69d508db-93c1-4dac-afe3-3e3fdfb5271f@jaseg.de> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <69d508db-93c1-4dac-afe3-3e3fdfb5271f@jaseg.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5B2F640010 X-Stat-Signature: x9itod7rbcc7hrbokx93w7cehag88bgc X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1787322521-269817 X-HE-Meta: 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 srI0/O73 dkFtnF3rTIPFedBCSRE1OcNFOtecxx+257ckqOM3ixzGxB1QgZAO+uR5q8nQSC+jXBLTesaqJyv8x7R4zoLf9LuqmrXdLpHoI/sCpulbsSD0hwI6nRGWrwIP4ZGtg8gXNCZbK00Y1WDCC0k4kVvnZOyCgGsbfKN4R7GWPftAkAoqmwn0v+jICRhZD9ZPvzSOtUabSUIM2ymvoB6WONmZfakoY1wwUz/NgZXYLQjYrwjw9+tvJl3QRPlubN1K0ASUJiQ+he+w7cjwt1P7fSu4MCKbIaw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/11/26 17:18, Jan Sebastian Götte wrote: > On 8/11/26 17:14, David Hildenbrand (Arm) wrote: >> On 8/11/26 17:05, Jan Sebastian Götte wrote: >>> >>> I'm aware nobody is really using secretmem. I decided to build this on top of >>> secretmem because it's an existing API that actually kind of fits the use case. >>> While I could have added a new API just for this (marking userspace memory as >>> wipe-on-crash), making it part of secretmem instead gives some additional >>> defense-in-depth protection for both users who only need wiping, and for users >>> who only want secretmem's additional protection against kernel memory read >>> primitives so I think everyone wins here. >> >> What I was thinking when I looked at patch #3+#4: 50% of the users you add are >> irrelevant in practice. >> >> Or are you saying that you are going to start using secretmem for your use case? > > I'm in fact going to start using secretmem. Okay, thanks for clarifying! -- Cheers, David