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 >
