From patchwork Mon Apr 13 16:51:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaldo Carvalho de Melo X-Patchwork-Id: 11486013 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 309C51392 for ; Mon, 13 Apr 2020 16:55:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 17C50208FE for ; Mon, 13 Apr 2020 16:55:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586796904; bh=S9zsoZaEeRAovYBhoG6sjAQNUq7j5Am/ZPdNcUlRFdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pI9xdSwiTXgFMyM75fmN2mISWCwPEFteyJ/hJa3exoFJbKb137O5Ai18fTwDrTWqB NjEtA6+p7NJTHgTUEuUWiBqkMPiop00yQHeuU52wcViKr1EKdKaeq4K23wS0cj/5AK b4suCqtlGvwNOeZRUAQSQJ7E/SvpgcY1OT5dVEWU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731963AbgDMQxT (ORCPT ); Mon, 13 Apr 2020 12:53:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:45276 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731938AbgDMQxK (ORCPT ); Mon, 13 Apr 2020 12:53:10 -0400 Received: from quaco.ghostprotocols.net (unknown [179.97.37.151]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 997C2208FE; Mon, 13 Apr 2020 16:53:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586796789; bh=S9zsoZaEeRAovYBhoG6sjAQNUq7j5Am/ZPdNcUlRFdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nnl+mOx4rEjA1iBPwbYvhatCRtMT0c3UDzLrdqWeOp1JNg6MbFrs+jc+jPe5kk67R G1Pq7BtkH4AMjg7Bp0aKvgzUw/1XWnIJhWhRSkC8KkbXeHOq6WidzMBT50wK7w9VN4 8lp7A8qTqu8y0x0ndSQ3Au95akSJQH5eON+O0VXE= From: Arnaldo Carvalho de Melo To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Alexey Budankov , James Morris , Anju T Sudhakar , Alexei Starovoitov , Andi Kleen , Igor Lubashev , Jiri Olsa , Peter Zijlstra , Serge Hallyn , Song Liu , Stephane Eranian , intel-gfx@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-man@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, Arnaldo Carvalho de Melo Subject: [PATCH 11/26] powerpc/perf: open access for CAP_PERFMON privileged process Date: Mon, 13 Apr 2020 13:51:48 -0300 Message-Id: <20200413165203.1816-12-acme@kernel.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200413165203.1816-1-acme@kernel.org> References: <20200413165203.1816-1-acme@kernel.org> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: From: Alexey Budankov Open access to 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 principle 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 the monitoring remains open for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN usage for secure monitoring is discouraged with respect to CAP_PERFMON capability. Signed-off-by: Alexey Budankov Reviewed-by: James Morris Acked-by: Anju T Sudhakar Cc: Alexei Starovoitov Cc: Andi Kleen Cc: Igor Lubashev Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Serge Hallyn Cc: Song Liu Cc: Stephane Eranian Cc: Thomas Gleixner Cc: intel-gfx@lists.freedesktop.org Cc: linux-doc@vger.kernel.org Cc: linux-man@vger.kernel.org Cc: linux-security-module@vger.kernel.org Cc: selinux@vger.kernel.org Link: http://lore.kernel.org/lkml/ac98cd9f-b59e-673c-c70d-180b3e7695d2@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- arch/powerpc/perf/imc-pmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index cb50a9e1fd2d..e837717492e4 100644 --- a/arch/powerpc/perf/imc-pmu.c +++ b/arch/powerpc/perf/imc-pmu.c @@ -898,7 +898,7 @@ static int thread_imc_event_init(struct perf_event *event) if (event->attr.type != event->pmu->type) return -ENOENT; - if (!capable(CAP_SYS_ADMIN)) + if (!perfmon_capable()) return -EACCES; /* Sampling not supported */ @@ -1307,7 +1307,7 @@ static int trace_imc_event_init(struct perf_event *event) if (event->attr.type != event->pmu->type) return -ENOENT; - if (!capable(CAP_SYS_ADMIN)) + if (!perfmon_capable()) return -EACCES; /* Return if this is a couting event */