Re: [PATCH v5 0/3] perf/core: Check sample_type in sample data saving helper functions

[Namhyung Kim]

Hello,

On Wed, May 15, 2024 at 12:36 PM Yabin Cui <yabinc@xxxxxxxxxx> 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().
>
> Changes since v4:
>  - Give a warning if data->sample_flags is already set when calling the
>    helper functions.
>
> 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

Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>

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         | 26 +++++++++++++++++-----
>  kernel/events/core.c               | 35 +++++++++++++++---------------
>  kernel/trace/bpf_trace.c           | 11 +++++-----
>  10 files changed, 55 insertions(+), 43 deletions(-)
>
> --
> 2.45.0.rc1.225.g2a3ae87e7f-goog
>