On Wed, May 22, 2024 at 9:27 AM Namhyung Kim <namhyung@xxxxxxxxxx> wrote: > > 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 > Hi performance events subsystem maintainers, The v5 patches were modified based on Peter's comments on the v4 patches. I'd be grateful if you could take a look when you have a moment. Thank you for your time and consideration. Thanks, Yabin > > > > 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 > >
