From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Hello, This patchset introduces a new tool, valid access checker. Vchecker is a dynamic memory error detector. It provides a new debug feature that can find out an un-intended access to valid area. Valid area here means the memory which is allocated and allowed to be accessed by memory owner and un-intended access means the read/write that is initiated by non-owner. Usual problem of this class is memory overwritten. Most of debug feature focused on finding out un-intended access to in-valid area, for example, out-of-bound access and use-after-free, and, there are many good tools for it. But, as far as I know, there is no good tool to find out un-intended access to valid area. This kind of problem is really hard to solve so this tool would be very useful. This tool doesn't automatically catch a problem. Manual runtime configuration to specify the target object is required. Note that there was a similar attempt for the debugging overwritten problem however it requires manual code modifying and recompile. http://lkml.kernel.org/r/<20171117223043.7277-1-wen.gang.wang@xxxxxxxxxx> To get more information about vchecker, please see a documention at the last patch. Patchset can also be available at https://github.com/JoonsooKim/linux/tree/vchecker-master-v1.0-next-20171122 Enjoy it. Thanks. Joonsoo Kim (14): mm/kasan: make some kasan functions global vchecker: introduce the valid access checker vchecker: mark/unmark the shadow of the allocated objects vchecker: prepare per object memory for vchecker vchecker: store/report callstack of value writer lib/stackdepot: extend stackdepot API to support per-user stackdepot vchecker: consistently exclude vchecker's stacktrace vchecker: fix 'remove' handling on callstack checker mm/vchecker: support inline KASAN build mm/vchecker: make callstack depth configurable mm/vchecker: pass allocation caller address to vchecker hook mm/vchecker: support allocation caller filter lib/vchecker_test: introduce a sample for vchecker test doc: add vchecker document Namhyung Kim (4): lib/stackdepot: Add is_new arg to depot_save_stack vchecker: Add 'callstack' checker vchecker: Support toggle on/off of callstack check vchecker: Use __GFP_ATOMIC to save stacktrace Documentation/dev-tools/vchecker.rst | 200 +++++++ drivers/gpu/drm/drm_mm.c | 4 +- include/linux/kasan.h | 1 + include/linux/slab.h | 8 + include/linux/slab_def.h | 3 + include/linux/slub_def.h | 3 + include/linux/stackdepot.h | 10 +- lib/Kconfig.kasan | 21 + lib/Makefile | 1 + lib/stackdepot.c | 126 ++-- lib/vchecker_test.c | 117 ++++ mm/kasan/Makefile | 1 + mm/kasan/kasan.c | 14 +- mm/kasan/kasan.h | 3 + mm/kasan/report.c | 12 +- mm/kasan/vchecker.c | 1089 ++++++++++++++++++++++++++++++++++ mm/kasan/vchecker.h | 43 ++ mm/page_owner.c | 8 +- mm/slab.c | 47 +- mm/slab.h | 14 +- mm/slab_common.c | 25 + mm/slub.c | 49 +- 22 files changed, 1730 insertions(+), 69 deletions(-) create mode 100644 Documentation/dev-tools/vchecker.rst create mode 100644 lib/vchecker_test.c create mode 100644 mm/kasan/vchecker.c create mode 100644 mm/kasan/vchecker.h -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
