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Fri, 10 Jan 2020 08:45:34 -0800 (PST) Received: from quaco.ghostprotocols.net ([179.97.37.151]) by smtp.gmail.com with ESMTPSA id g81sm1091649qkb.70.2020.01.10.08.45.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jan 2020 08:45:33 -0800 (PST) From: Arnaldo Carvalho de Melo X-Google-Original-From: Arnaldo Carvalho de Melo Received: by quaco.ghostprotocols.net (Postfix, from userid 1000) id BCA6F40DFD; Fri, 10 Jan 2020 13:45:31 -0300 (-03) Date: Fri, 10 Jan 2020 13:45:31 -0300 To: Masami Hiramatsu Subject: Re: [PATCH v4 2/9] perf/core: open access for CAP_SYS_PERFMON privileged process Message-ID: <20200110164531.GA2598@kernel.org> References: <20200108160713.GI2844@hirez.programming.kicks-ass.net> <20200110140234.GO2844@hirez.programming.kicks-ass.net> <20200111005213.6dfd98fb36ace098004bde0e@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200111005213.6dfd98fb36ace098004bde0e@kernel.org> X-Url: http://acmel.wordpress.com X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Song Liu , Peter Zijlstra , "joonas.lahtinen@linux.intel.com" , Will Deacon , Alexei Starovoitov , Stephane Eranian , "james.bottomley@hansenpartnership.com" , Paul Mackerras , Jiri Olsa , Andi Kleen , Alexey Budankov , Igor Lubashev , James Morris , Alexander Shishkin , Ingo Molnar , oprofile-list@lists.sf.net, Serge Hallyn , Robert Richter , Kees Cook , Jann Horn , "selinux@vger.kernel.org" , "intel-gfx@lists.freedesktop.org" , "jani.nikula@linux.intel.com" , Lionel Landwerlin , "rodrigo.vivi@intel.com" , Namhyung Kim , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Tvrtko Ursulin , "linux-parisc@vger.kernel.org" , linux-kernel , "linux-perf-users@vger.kernel.org" , "linux-security-module@vger.kernel.org" , Casey Schaufler , "bpf@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Em Sat, Jan 11, 2020 at 12:52:13AM +0900, Masami Hiramatsu escreveu: > On Fri, 10 Jan 2020 15:02:34 +0100 Peter Zijlstra wrote: > > Again, this only allows attaching to previously created kprobes, it does > > not allow creating kprobes, right? > > That is; I don't think CAP_SYS_PERFMON should be allowed to create > > kprobes. > > As might be clear; I don't actually know what the user-ABI is for > > creating kprobes. > There are 2 ABIs nowadays, ftrace and ebpf. perf-probe uses ftrace interface to > define new kprobe events, and those events are treated as completely same as > tracepoint events. On the other hand, ebpf tries to define new probe event > via perf_event interface. Above one is that interface. IOW, it creates new kprobe. Masami, any plans to make 'perf probe' use the perf_event_open() interface for creating kprobes/uprobes? - Arnaldo