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=-5.2 required=3.0 tests=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 717F6C3404B for ; Tue, 18 Feb 2020 23:03:49 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 515C424656 for ; Tue, 18 Feb 2020 23:03:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 515C424656 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=namei.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 028956EADC; Tue, 18 Feb 2020 23:03:49 +0000 (UTC) Received: from namei.org (namei.org [65.99.196.166]) by gabe.freedesktop.org (Postfix) with ESMTPS id D9CA36EA76 for ; Tue, 18 Feb 2020 19:22:37 +0000 (UTC) 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 In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21 (LRH 202 2017-01-01) MIME-Version: 1.0 X-Mailman-Approved-At: Tue, 18 Feb 2020 23:03:31 +0000 Subject: Re: [Intel-gfx] [PATCH v7 02/12] perf/core: open access to the core for CAP_PERFMON privileged process X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-man@vger.kernel.org, "linux-doc@vger.kernel.org" , Peter Zijlstra , 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 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" 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 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx