From patchwork Mon Apr 13 16:51:51 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: 11485987 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 678301392 for ; Mon, 13 Apr 2020 16:53:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F58A20857 for ; Mon, 13 Apr 2020 16:53:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586796813; bh=9kpEN/lFo7jxjTeW9ri+Y7V19Ly0ojOP0oybPA/ulXo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hNwuNwbTa4cYoNYbXfrFXg2ugZtzmcBzikD8dfLN/8N4HQSkMHP7NGygh1A4fvMiz OUl1yGxhJPGcWJUpGGyH5deVYrUJdvtJdk3eQM/8Bo3whQ2g9Sbqx3iwDFN126ZZCJ JqsXgb7QbOT0AlRQ3t3XeDxq46T3jNIT3nS2JPGw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732001AbgDMQxa (ORCPT ); Mon, 13 Apr 2020 12:53:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:45690 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731988AbgDMQx1 (ORCPT ); Mon, 13 Apr 2020 12:53:27 -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 E40622137B; 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=1586796807; bh=9kpEN/lFo7jxjTeW9ri+Y7V19Ly0ojOP0oybPA/ulXo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AbVaFG4TIM9q3J0Fn0q8sEt6xEb3k/7967jRmoFoVVS6Opuxby9bWRBFpmhFCOb8q j0t6fV5QtWQoN98bB2yumokWiQRwbd3sDFZoaMu0yrCC1SVqDl/mB5H98qNwTs5Q8z GoNCBKocbwwz9gt9C4raHssA8eHnAzrh2cy4gZ9I= 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 , 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 14/26] drivers/oprofile: Open access for CAP_PERFMON privileged process Date: Mon, 13 Apr 2020 13:51:51 -0300 Message-Id: <20200413165203.1816-15-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 Acked-by: James Morris 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/691f1096-b15f-9b12-50a0-c2b93918149e@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- drivers/oprofile/event_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/oprofile/event_buffer.c b/drivers/oprofile/event_buffer.c index 12ea4a4ad607..6c9edc8bbc95 100644 --- a/drivers/oprofile/event_buffer.c +++ b/drivers/oprofile/event_buffer.c @@ -113,7 +113,7 @@ static int event_buffer_open(struct inode *inode, struct file *file) { int err = -EPERM; - if (!capable(CAP_SYS_ADMIN)) + if (!perfmon_capable()) return -EPERM; if (test_and_set_bit_lock(0, &buffer_opened))