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 2D7C5C34026 for ; Tue, 18 Feb 2020 19:22:50 +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 006E921D56 for ; Tue, 18 Feb 2020 19:22:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="RRZx6x5U" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 006E921D56 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=DVOW+DPUbsKQhSyVbZa4DE/09JzCCskowaLqvAW4WIk=; b=RRZx6x5Ulag/Ax oNaInpPIfNY1rTr+wn5AVCu1oM3ZQZYf44kBj4+qfk6hA0mfmn8mbYs0Hhal1oPQ4P3+8eG9BVTLF BQWJyTyhY03VpoJuBFK8iBl8CUmmVZ7Su9F4WFzoD1ob7VO+nnujZhadQR8rVGQrvCGU0Dbu4aUvv zrbVvmt25PAc9FuN1F/WsEjZXXgV/00wWEoe3imeg0KgiFjDm9G5e0OAdd30nNWla0bQZC9xgqZ6O 6zG9MgQplkj1eCAFiq8GSWJaMDdZ3+z/wxYWFsnyzZ51pYvfiKPMKAfBWQvXMdm+9hW6kFfLgQVsI f/jDwMrlRKVBaUQyCgpg==; 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 1j48SA-0001qz-C1; Tue, 18 Feb 2020 19:22:42 +0000 Received: from namei.org ([65.99.196.166]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j48S6-0001oh-G7 for linux-arm-kernel@lists.infradead.org; Tue, 18 Feb 2020 19:22:39 +0000 Received: from localhost (localhost [127.0.0.1]) by namei.org (8.14.4/8.14.4) with ESMTP id 01IJMJhB013131; Tue, 18 Feb 2020 19:22:19 GMT Date: Wed, 19 Feb 2020 06:22:19 +1100 (AEDT) From: James Morris To: Alexey Budankov Subject: Re: [PATCH v7 02/12] perf/core: open access to the core for CAP_PERFMON privileged process In-Reply-To: Message-ID: References: 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_112238_612548_AD6243EE X-CRM114-Status: UNSURE ( 9.75 ) 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 monitoring of kernel code, cpus, tracepoints and > namespaces data for a 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 perf_events subsystem > remains open for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN > usage for secure perf_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