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From: Jiri Olsa <jolsa@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Milind Chabbi <chabbi.milind@gmail.com>,
	Jiri Olsa <jolsa@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	lkml <linux-kernel@vger.kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	David Ahern <dsahern@gmail.com>, Andi Kleen <ak@linux.intel.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Hari Bathini <hbathini@linux.vnet.ibm.com>,
	Jin Yao <yao.jin@linux.intel.com>,
	Kan Liang <kan.liang@intel.com>,
	Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
	Oleg Nesterov <onestero@redhat.com>,
	Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH 4/6] hw_breakpoint: Factor out __modify_user_hw_breakpoint function
Date: Mon, 27 Nov 2017 23:25:28 +0100	[thread overview]
Message-ID: <20171127222528.GA14335@krava> (raw)
In-Reply-To: <20171127220128.kzgywcu5ucudaeyl@hirez.programming.kicks-ass.net>

On Mon, Nov 27, 2017 at 11:01:28PM +0100, Peter Zijlstra wrote:
> On Mon, Nov 27, 2017 at 01:50:30PM -0800, Milind Chabbi wrote:
> > The possible checks is infinite
> 
> struct perf_event_attr is very much a finite data type.
> 
> Something as simple as:
> 
> 	struct perf_event_attr tmp1 = new_attr, tmp2 = event->attr;
> 
> 	tmp1.bp_type = tmp2.bp_type;
> 	tmp1.bp_addr = tmp2.bp_addr;
> 	tmp1.bp_len  = tmp2.bp_len;
> 
> 	if (memcmp(&tmp1, &tmp2, sizeof(tmp1)))
> 		return -EINVAL;
> 
> would actually do the checks __modify_user_hw_breakpoint() needs to do.

I see.. will post new version

thanks,
jirka

  parent reply	other threads:[~2017-11-27 22:25 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-27 16:21 [PATCH 0/6] hw_breakpoint: Breakpoint modification fixes Jiri Olsa
2017-11-27 16:21 ` [PATCH 1/6] hw_breakpoint: Pass bp_type directly as find_slot_idx argument Jiri Olsa
2017-11-27 16:21 ` [PATCH 2/6] hw_breakpoint: Pass bp_type argument to __reserve_bp_slot|__release_bp_slot Jiri Olsa
2017-11-27 16:21 ` [PATCH 3/6] hw_breakpoint: Add modify_bp_slot function Jiri Olsa
2017-11-27 16:21 ` [PATCH 4/6] hw_breakpoint: Factor out __modify_user_hw_breakpoint function Jiri Olsa
2017-11-27 16:46   ` Peter Zijlstra
2017-11-27 17:09     ` Jiri Olsa
2017-11-27 17:12       ` Peter Zijlstra
2017-11-27 17:25         ` Jiri Olsa
2017-11-27 17:34           ` Peter Zijlstra
2017-11-27 21:20             ` Peter Zijlstra
2017-11-27 21:50               ` Milind Chabbi
2017-11-27 22:01                 ` Peter Zijlstra
2017-11-27 22:16                   ` Milind Chabbi
2017-11-27 22:25                   ` Jiri Olsa [this message]
2017-11-27 22:41                     ` Milind Chabbi
2017-11-27 23:07                   ` Andi Kleen
2017-11-27 23:31                     ` Milind Chabbi
2017-11-28 11:24                     ` Jiri Olsa
2017-11-27 16:21 ` [PATCH 5/6] perf/core: fast breakpoint modification via _IOC_MODIFY_ATTRIBUTES Jiri Olsa
2017-11-27 16:21 ` [PATCH 6/6] perf tests: Add breakpoint accounting/modify test Jiri Olsa

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