Message ID | 4c91a53f-0124-0816-917d-a8cb232dc6a1@linux.intel.com (mailing list archive) |
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State | New, archived |
Headers | show
Return-Path: <SRS0=bz+b=3J=lists.infradead.org=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@kernel.org> 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 0F1E0921 for <patchwork-linux-arm@patchwork.kernel.org>; Mon, 20 Jan 2020 11:30:08 +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 CC9F5207E0 for <patchwork-linux-arm@patchwork.kernel.org>; Mon, 20 Jan 2020 11:30:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="e1V+x/w0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC9F5207E0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.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:In-Reply-To:MIME-Version:Date: Message-ID:References:To:From:Subject:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=jfPHI8KXOVfjxu/tcO8HKqTbsDWpLJ2uRXkOHhV381c=; b=e1V+x/w0tH4dvn elpT8TQOQh3ZaJgl2+wBsSrP1qVzc8YGa8PaqJsC9Wkz/pdeBT3MfwIEHpfnW7esZIgViuV2QvQou boPGO/BW2NZd+WcPs24mUeoY/eNTi2i3hsQtLSYeL1rPR7iTgCacOxWXWEjPrv8kCo6ZOzjYhR8Hn NDojRxMb5enHM/9Og2zOBIWaOfa0re2oH4qE2H62yDoORtyWQA0SoiqesZutCJMhONVufqivseAzI 40rksNR0+ty5HeAR1J9zDlA4tdphOIUk2i9T1FPSQj8Hs0ImFc6D8WNbFqKDC0mpBBJ+od47dWLSE KmhpeX7Pm8k3GdsvL1Uw==; 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 1itVFs-00054b-Hs; Mon, 20 Jan 2020 11:30:04 +0000 Received: from mga07.intel.com ([134.134.136.100]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1itVFn-0004bW-0A for linux-arm-kernel@lists.infradead.org; Mon, 20 Jan 2020 11:30:03 +0000 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Jan 2020 03:29:57 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,341,1574150400"; d="scan'208";a="426701472" Received: from linux.intel.com ([10.54.29.200]) by fmsmga006.fm.intel.com with ESMTP; 20 Jan 2020 03:29:54 -0800 Received: from [10.125.252.193] (abudanko-mobl.ccr.corp.intel.com [10.125.252.193]) by linux.intel.com (Postfix) with ESMTP id 74B705802C1; Mon, 20 Jan 2020 03:29:46 -0800 (PST) Subject: [PATCH v5 06/10] trace/bpf_trace: open access for CAP_PERFMON privileged process From: Alexey Budankov <alexey.budankov@linux.intel.com> To: Peter Zijlstra <peterz@infradead.org>, Arnaldo Carvalho de Melo <acme@kernel.org>, Ingo Molnar <mingo@redhat.com>, "jani.nikula@linux.intel.com" <jani.nikula@linux.intel.com>, "joonas.lahtinen@linux.intel.com" <joonas.lahtinen@linux.intel.com>, "rodrigo.vivi@intel.com" <rodrigo.vivi@intel.com>, "benh@kernel.crashing.org" <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, "james.bottomley@hansenpartnership.com" <james.bottomley@hansenpartnership.com>, Serge Hallyn <serge@hallyn.com>, James Morris <jmorris@namei.org>, Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>, Robert Richter <rric@kernel.org>, Alexei Starovoitov <ast@kernel.org> References: <0548c832-7f4b-dc4c-8883-3f2b6d351a08@linux.intel.com> Organization: Intel Corp. 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Introduce CAP_PERFMON to secure system performance monitoring and observability
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expand
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diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index e5ef4ae9edb5..334f1d71ebb1 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1395,7 +1395,7 @@ int perf_event_query_prog_array(struct perf_event *event, void __user *info) u32 *ids, prog_cnt, ids_len; int ret; - if (!capable(CAP_SYS_ADMIN)) + if (!perfmon_capable()) return -EPERM; if (event->attr.type != PERF_TYPE_TRACEPOINT) return -EINVAL;
Open access to bpf_trace monitoring for CAP_PERFMON privileged processes. For backward compatibility reasons access to bpf_trace monitoring remains open for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN usage for secure bpf_trace monitoring is discouraged with respect to CAP_PERFMON capability. Providing the access under CAP_PERFMON capability singly, without the rest of CAP_SYS_ADMIN credentials, excludes chances to misuse the credentials and makes operations more secure. Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com> --- kernel/trace/bpf_trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)