From patchwork Mon Apr 13 16:51:49 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: 11485981 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 372791392 for ; Mon, 13 Apr 2020 16:53:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 200892084D for ; Mon, 13 Apr 2020 16:53:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586796801; bh=PXwArPyrCB+9UYBajG3cuzXYyMjKBkArgtx7/t80yDQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2EYqxGGRbQUL6YX059Of5C0td+T7qxjIYzsrpz6M+knyh83T2bD63EimazJ7vJIi/ LecRw+MB/SMgsyXno4O3D4FWKDN81rETzyPxMO+EyphOu2dHbb+TV+VrbSFCwi8ngO s1zxKp1CnT/V6RZlLdSSXShIWv4VygJIbA+gpoTU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731958AbgDMQxT (ORCPT ); Mon, 13 Apr 2020 12:53:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:45460 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731956AbgDMQxQ (ORCPT ); Mon, 13 Apr 2020 12:53:16 -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 62EF7208E0; Mon, 13 Apr 2020 16:53:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586796795; bh=PXwArPyrCB+9UYBajG3cuzXYyMjKBkArgtx7/t80yDQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0Ye3QTeaS86gUwQ6vaqghWKUPtsyPWvtMoV/T9srtDd688AuzzYOnmOfSSyvNb1NZ pSnQ5WUa2265qzabJQcZ4l3PD7KRbGUKgZcmm0QHRyhkVj0NcQ8eVgFAaHIehQ83Uw 0LGYeTc2nhKKtj6ANWzZ4NMou+5ERcZbUKkFpZBk= 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 , Helge Deller , 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 12/26] parisc/perf: open access for CAP_PERFMON privileged process Date: Mon, 13 Apr 2020 13:51:49 -0300 Message-Id: <20200413165203.1816-13-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: Helge Deller 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/8cc98809-d35b-de0f-de02-4cf554f3cf62@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- arch/parisc/kernel/perf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/parisc/kernel/perf.c b/arch/parisc/kernel/perf.c index e1a8fee3ad49..d46b6709ec56 100644 --- a/arch/parisc/kernel/perf.c +++ b/arch/parisc/kernel/perf.c @@ -300,7 +300,7 @@ static ssize_t perf_write(struct file *file, const char __user *buf, else return -EFAULT; - if (!capable(CAP_SYS_ADMIN)) + if (!perfmon_capable()) return -EACCES; if (count != sizeof(uint32_t))