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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3F45C34026 for ; Tue, 18 Feb 2020 19:26:36 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id C5CBE21D56 for ; Tue, 18 Feb 2020 19:26:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="bEOPz6rf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C5CBE21D56 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=namei.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Message-ID: In-Reply-To:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ohlewgkhXFQPf9Vl0vO+2ctvaJ4BygzBglctJyOvkok=; b=bEOPz6rfmZ8GNz yFJ4G0HuYUi91L8Y5NqdycfEZ/v0975Rj0xVYA5nxy/0jEJzrLq1DuED/Yzf0f5Q0rXW9CQll90gp LIG6PLbwtF1f2FYRWpa/p2dVXfFd3VViux4xWP3MVKk5ZPKs+DZmI23/XemtMsbENQ1dr9dN48Zvd TMoyK8cDtTJFJU+yPKr46Xoxp+qevTomo1wkp5HLuLlDPqaEx0POK9tkRTuB2wdmJIkPsq+AOgib4 TkgVAer9jmZG2/3pX9eiHVPLmQF7e9EW03mY1bU8ll1Wg2S+xAa72XRuC95MPjBdrL2+rOV7cIHkR jSlJQAABxSytNlpLy2ag==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j48Vm-00041c-FQ; Tue, 18 Feb 2020 19:26:26 +0000 Received: from namei.org ([65.99.196.166]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j48Vj-00041E-JX for linux-arm-kernel@lists.infradead.org; Tue, 18 Feb 2020 19:26:24 +0000 Received: from localhost (localhost [127.0.0.1]) by namei.org (8.14.4/8.14.4) with ESMTP id 01IJP3Ub013606; Tue, 18 Feb 2020 19:25:03 GMT Date: Wed, 19 Feb 2020 06:25:03 +1100 (AEDT) From: James Morris To: Alexey Budankov Subject: Re: [PATCH v7 05/12] drm/i915/perf: open access for CAP_PERFMON privileged process In-Reply-To: <8b408c10-9bb0-4b08-8681-93c0f4a1132e@linux.intel.com> Message-ID: References: <8b408c10-9bb0-4b08-8681-93c0f4a1132e@linux.intel.com> User-Agent: Alpine 2.21 (LRH 202 2017-01-01) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200218_112623_717954_EBCF1CDD X-CRM114-Status: UNSURE ( 9.14 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-man@vger.kernel.org, "linux-doc@vger.kernel.org" , Peter Zijlstra , "joonas.lahtinen@linux.intel.com" , Alexei Starovoitov , Stephane Eranian , Paul Mackerras , Jiri Olsa , Ingo Molnar , Andi Kleen , Will Deacon , Helge Deller , Igor Lubashev , oprofile-list@lists.sf.net, Stephen Smalley , Serge Hallyn , "selinux@vger.kernel.org" , "intel-gfx@lists.freedesktop.org" , Arnaldo Carvalho de Melo , Thomas Gleixner , linux-arm-kernel , "linux-parisc@vger.kernel.org" , linux-kernel , "linux-security-module@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 17 Feb 2020, Alexey Budankov wrote: > > Open access to i915_perf monitoring for CAP_PERFMON privileged process. > Providing the access under CAP_PERFMON capability singly, without the > rest of CAP_SYS_ADMIN credentials, excludes chances to misuse the > credentials and makes operation more secure. > > CAP_PERFMON implements the principal of least privilege for performance > monitoring and observability operations (POSIX IEEE 1003.1e 2.2.2.39 > principle of least privilege: A security design principle that states > that a process or program be granted only those privileges (e.g., > capabilities) necessary to accomplish its legitimate function, and only > for the time that such privileges are actually required) > > For backward compatibility reasons access to i915_events subsystem > remains open for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN > usage for secure i915_events monitoring is discouraged with respect to > CAP_PERFMON capability. > > Signed-off-by: Alexey Budankov Reviewed-by: James Morris -- James Morris _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel