linux-kernel - Re: [PATCH v4 0/3] perf/core: Check sample_type in sample data saving helper functions

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Message-ID: <CAM9d7chJLfuAf+ZryG6ae0TyB3cyDzQqxPBAZaO9UStPx_O2UA@mail.gmail.com>
Date: Fri, 10 May 2024 14:26:53 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Yabin Cui <yabinc@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	bpf@...r.kernel.org
Subject: Re: [PATCH v4 0/3] perf/core: Check sample_type in sample data saving
 helper functions

Hi Yabin,

On Fri, May 10, 2024 at 12:14 PM Yabin Cui <yabinc@...gle.com> wrote:
>
> Hello,
>
> We use helper functions to save raw data, callchain and branch stack in
> perf_sample_data. These functions update perf_sample_data->dyn_size without
> checking event->attr.sample_type, which may result in unused space allocated in
> sample records. To prevent this from happening, this patchset enforces checking
> sample_type of an event in these helper functions.
>
> Thanks,
> Yabin
>
>
> Changes since v1:
>  - Check event->attr.sample_type & PERF_SAMPLE_RAW before
>    calling perf_sample_save_raw_data().
>  - Subject has been changed to reflect the change of solution.
>
> Changes since v2:
>  - Move sample_type check into perf_sample_save_raw_data().
>  - (New patch) Move sample_type check into perf_sample_save_callchain().
>  - (New patch) Move sample_type check into perf_sample_save_brstack().
>
> Changes since v3:
>  - Fix -Werror=implicit-function-declaration by moving has_branch_stack().
>
> Original commit message from v1:
>   perf/core: Trim dyn_size if raw data is absent
>
> Original commit message from v2/v3:
>   perf/core: Save raw sample data conditionally based on sample type
>
> Yabin Cui (3):
>   perf/core: Save raw sample data conditionally based on sample type
>   perf/core: Check sample_type in perf_sample_save_callchain
>   perf/core: Check sample_type in perf_sample_save_brstack

Thanks for doing this!

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung

>
>  arch/s390/kernel/perf_cpum_cf.c    |  2 +-
>  arch/s390/kernel/perf_pai_crypto.c |  2 +-
>  arch/s390/kernel/perf_pai_ext.c    |  2 +-
>  arch/x86/events/amd/core.c         |  3 +--
>  arch/x86/events/amd/ibs.c          |  5 ++---
>  arch/x86/events/core.c             |  3 +--
>  arch/x86/events/intel/ds.c         |  9 +++-----
>  include/linux/perf_event.h         | 20 ++++++++++++-----
>  kernel/events/core.c               | 35 +++++++++++++++---------------
>  kernel/trace/bpf_trace.c           | 11 +++++-----
>  10 files changed, 49 insertions(+), 43 deletions(-)
>
> --
> 2.45.0.118.g7fe29c98d7-goog
>