linux-kernel - Re: [PATCH 1/3] perf: Copy perf_event_attr::sig

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Message-ID: <20220201110720.GU20638@worktop.programming.kicks-ass.net>
Date:   Tue, 1 Feb 2022 12:07:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Marco Elver <elver@...gle.com>, Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] perf: Copy perf_event_attr::sig_data on modification

On Tue, Feb 01, 2022 at 08:32:45AM +0100, Dmitry Vyukov wrote:
> On Mon, 31 Jan 2022 at 11:34, Marco Elver <elver@...gle.com> wrote:
> >
> > The intent has always been that perf_event_attr::sig_data should also be
> > modifiable along with PERF_EVENT_IOC_MODIFY_ATTRIBUTES, because it is
> > observable by user space if SIGTRAP on events is requested.
> >
> > Currently only PERF_TYPE_BREAKPOINT is modifiable, and explicitly copies
> > relevant breakpoint-related attributes in hw_breakpoint_copy_attr().
> > This misses copying perf_event_attr::sig_data.
> >
> > Since sig_data is not specific to PERF_TYPE_BREAKPOINT, introduce a
> > helper to copy generic event-type-independent attributes on
> > modification.
> >
> > Fixes: 97ba62b27867 ("perf: Add support for SIGTRAP on perf events")
> > Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> > Signed-off-by: Marco Elver <elver@...gle.com>
> 
> Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>

Thanks guys! Queued for perf/urgent