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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 02872C5DF89 for ; Fri, 21 Aug 2026 14:28:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=d5z1Xu44las/mDWEQ2T0kdUfLaS63+SXiGlCJ/8yslI=; b=QHbg1utkqEoBcY2XiHmyWIRuU1 bPs5AcsAVHRmBNognCMIQbyuYJd4a3nedU5prAwMwImmX6xv9Nu5hLJCermEubrW/Ap7woKgPs6Zo b2ASeiY8lHpUZJgyvMsR1zHopqErcI9qQYdzCxsjEpvsMNvqIbKes9S4NTP1UKwHxg+zgi5ZgTD+F TqeH+7DMyee73ayRcUbbn//PC3vP7jyu4aSNkkTqFP1FJ51TZm1IFtwHiFuMjIG/u+g4AAy2sFwyU kKkYl+QNqCZMdfJIlPVT8S68K2Gz93V/z1TNyVbjUKQYOVWUxFxCW/3iIY9LpVMC5FJJtWsuZbLrz WXKL6xYw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wxQEc-0000000DYT4-2kzY; Fri, 21 Aug 2026 14:28:42 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wxQEb-0000000DYSx-0kvR for kexec@lists.infradead.org; Fri, 21 Aug 2026 14:28:41 +0000 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; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org 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