Submitting v4 for your review/consideration. First patch provides more reliable double-free detection for KASAN. Second patch provides new double-free tests for 'test_kasan'.
"Lock break" on out-of-bounds (OOB) write detection in patch v3 suffers from one fatal flaw: it's not possible to distinguish between when lock bit is set because a holder exists or because it got flipped by OOB. Patch v4 (this patch) solves the issue by exploiting header shadow memory for storing the per-object header lock bit. This makes locking more resilient even in the presence of OOB writes on header. v3 link: https://lkml.org/lkml/2016/5/24/577 Patchset is based on linux-next 'next-20160527'. Kuthonuzo Luruo (2): mm, kasan: improve double-free detection kasan: add double-free tests include/linux/kasan.h | 7 ++- lib/test_kasan.c | 47 ++++++++++++++++++ mm/kasan/kasan.c | 125 ++++++++++++++++++++++++++++++++++++++----------- mm/kasan/kasan.h | 24 +++++++++- mm/kasan/quarantine.c | 4 +- mm/kasan/report.c | 24 +++++++++- mm/slab.c | 3 +- mm/slub.c | 2 +- 8 files changed, 200 insertions(+), 36 deletions(-)
