From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qk1-f195.google.com (mail-qk1-f195.google.com [209.85.222.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AC7C39341C for ; Wed, 21 Jan 2026 13:18:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.195 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769001537; cv=none; b=NqeyTwX4x5t7Uqbp2c4mpDeNOCnroJDxA2BXOCg5cPjo9PaEV/glJkCJDi9A5sVKxIfEps2NBOjDZ7OUF0zSNZU+kbarvFVOBda2KzP92PwJxpstxzGkXmEJRJs7M9WWsaV0Qs3N9wTrkmRi7HqH1KzqdLwp/RSzO2DgkTiw80Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769001537; c=relaxed/simple; bh=wNQCHIWEBRMpiFqsZYjt880FRkRpyp1yzlc3O4lUKsM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ppPIsvIdHi7Hw0yqXuS5jL9BVejDIMrLdczJzluUXMYK8CzOJhDn4vknkGMKq6evkgjK8uQhg52Yl8WAX6AxztDkdscDfvGq6znmO5LCQ+iW31nC+IULk57vLTYntQvEA/tVJ9Mg4MA9O93GicNc1947bDtau7rPnNLBf/5NV1A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b=auPHecAk; arc=none smtp.client-ip=209.85.222.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="auPHecAk" Received: by mail-qk1-f195.google.com with SMTP id af79cd13be357-8c538d17816so846594385a.0 for ; Wed, 21 Jan 2026 05:18:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1769001534; x=1769606334; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=wNQCHIWEBRMpiFqsZYjt880FRkRpyp1yzlc3O4lUKsM=; b=auPHecAk2iN7ZabTIQ+tkLxDrluU4dCEBlYYIhuQln6eF1Bfx+8IsONn1dD3HP+pHo kiQR9I91Kuww1yFWj/b0sWSrQM/cMs+blizM0NWisDQRXI35HMLsNrpnQCOrCyVfikCe vtv9530cVL0Vy6XHmSQ+tPLww/3r5qwJOlToD/xpraBS24TriW5VROoubZgfTjSQRAzZ HFsaGYZ98Y19cSGkjjghhtYs4sRPm+TZkcQlwRwb8NXzyuUBw1jY450cHKzizuLt8uvP gpEw2V3dp6/9VWMVd7WI8vOGqrUW48hHbYOZvkGvapFeCU43rqCSgClWfcYHPf9PznOv KKVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769001534; x=1769606334; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=wNQCHIWEBRMpiFqsZYjt880FRkRpyp1yzlc3O4lUKsM=; b=rqXyrtdYvyveHbXwnJg86ANwABO0KuIjZMJ7DXUrQewqn55oVI6iXP4TFrbJ4uTOKf sXduWlsROvtRZgsSMXpMh7RH66yW+lACyYa5IirSBRmsof+5Y0n1tw9MdYZ7YA5Shjdp ooBFtN2Fwq3Bh3P3C1A2fczaDkRlDRd9WWpS8Zb1G6245ORp06zFTfb9R5d5N8jF53SQ oaKpP+OTrAvFUq9m2uPN/nQFfBiglUGj0mG5EUbEKP5IwfA0sWbjAw4loafV0SeFKp9l 01NKkvleMOU3seP0l4WJWtCtjkLBbXN58OOLts/YEORaYmEwIpJsewAuC4YRfksarAlc WxTg== X-Forwarded-Encrypted: i=1; AJvYcCUWbqO8N8uM1l5TwHvJmLO3wGe7Zbj8bLwhhbSX/8NO2s7ri1R/Y3AXuGlNvMqBtet/FYPdl9whypHyZg==@vger.kernel.org X-Gm-Message-State: AOJu0YynkPAa1AETFH9keRJj/z3fllhzB6u49s6DNg39yyb8/xJ0KwLT foFBPjayTr2Y4C4Pxwg7cLjFZ/VUhCvKrniK9vS6YO2RnQ+Fd0KbZFjelMPJCGtmbiY= X-Gm-Gg: AZuq6aJba/YGit+6HAlxSbqtV7V6C7Gu0UcGLkdysX7zpUOvG5aJUZoVImy/dUOfyoy DDr1hF5TRfuqM7F9fnWXZG76T6jNnC3NwVqvOZI43s2enEkv+rK2sp5at97MYl9D/9lwKe2FAgL ybqeNlLPxTSJ2c4bDlQlsBjpMWlGJ4JwO4Z7JG7WeibyGDCon6+dTbJqq1BXQQWNz/IYZn1at5N 3z9EgO09Lw2v8/QEPFj4iN4kl6Q69ODms2zqu71dz7p8xVbaA2o78qnvNA8TZ3E5W8O6UKx+3V3 +WRHKFFUhIzzTWZzQ+ljkTh0rSz9HHtA/3+Un6EACuw9ZpwBWrxwQczhxN2EYZPhZqoTHOCkmkd p7NFESPzkTwcGcyG4plBZDTMq0VDwFVy/2540jCJkW40arJGVnxu/cejgcp5lEpIhg2GEVXilHo iaEAsPJcmCMveNoWyKuOTRvZMM+bW6CxWN5h9bGA182cFLbuUWOZnZ7ui2tSPi3qSO7Yk= X-Received: by 2002:a05:620a:a819:b0:8c6:aaf3:cb44 with SMTP id af79cd13be357-8c6aaf3cd9bmr2247463385a.4.1769001534382; Wed, 21 Jan 2026 05:18:54 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-112-119.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.112.119]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8c6a71ad820sm1209794385a.10.2026.01.21.05.18.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jan 2026 05:18:53 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1viY6m-00000006DUF-3lkE; Wed, 21 Jan 2026 09:18:52 -0400 Date: Wed, 21 Jan 2026 09:18:52 -0400 From: Jason Gunthorpe To: Christian =?utf-8?B?S8O2bmln?= Cc: Leon Romanovsky , Sumit Semwal , Alex Deucher , David Airlie , Simona Vetter , Gerd Hoffmann , Dmitry Osipenko , Gurchetan Singh , Chia-I Wu , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Lucas De Marchi , Thomas =?utf-8?Q?Hellstr=C3=B6m?= , Rodrigo Vivi , Kevin Tian , Joerg Roedel , Will Deacon , Robin Murphy , Felix Kuehling , Alex Williamson , Ankit Agrawal , Vivek Kasireddy , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux.dev, intel-xe@lists.freedesktop.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org Subject: Re: [PATCH v3 3/7] dma-buf: Document RDMA non-ODP invalidate_mapping() special case Message-ID: <20260121131852.GX961572@ziepe.ca> References: <20260120-dmabuf-revoke-v3-0-b7e0b07b8214@nvidia.com> <20260120-dmabuf-revoke-v3-3-b7e0b07b8214@nvidia.com> <4fe42e7e-846c-4aae-8274-3e9a5e7f9a6d@amd.com> <20260121091423.GY13201@unreal> <7cfe0495-f654-4f9d-8194-fa5717eeafff@amd.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7cfe0495-f654-4f9d-8194-fa5717eeafff@amd.com> On Wed, Jan 21, 2026 at 10:17:16AM +0100, Christian König wrote: > The whole idea is to make invalidate_mappings truly optional. But it's not really optional! It's absence means we are ignoring UAF security issues when the exporters do their move_notify() and nothing happens. Given this I don't want to loose the warning log either, the situation needs to be reported.. Jason