perf/x86/intel: Add sanity check for PEBS record/fragment size

Prevent potential infinite loops by adding a sanity check for the
corrupted PEBS record or fragment size which could happen in theory.

If a corrupted PEBS fragment is detected, the entire PEBS record
including the corrupted fragment and all subsequent records will be
dropped and a NULL PEBS record is reported to user space. This ensures
the integrity of PEBS data and prevents infinite loops in
setup_arch_pebs_sample_data() again.

Please note software has no way to figure out which events are impacted
by the corrupted record, so the last record of each event would be
discarded for all events if corrupted record is detected even though
it may be a well-formed record for some events.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260824082731.1013973-24-dapeng1.mi@linux.intel.com

0 files changed, 0 insertions, 0 deletions