Hi, This adds defenses against slab cache confusion (as seen in real-world exploits[1]) and gracefully handles type confusions when trying to look up slab caches from an arbitrary page. (Also is patch 3: new LKDTM tests for these defenses as well as for the existing double-free detection. To avoid possible merge conflicts, I'd prefer patch 3 went via drivers/misc, which I will send to Greg separately, but I've included it here to help illustrate the issues.) -Kees [1] https://github.com/ThomasKing2014/slides/raw/master/Building%20universal%20Android%20rooting%20with%20a%20type%20confusion%20vulnerability.pdf Kees Cook (3): mm/slab: Validate cache membership under freelist hardening mm/slab: Sanity-check page type when looking up cache lkdtm/heap: Add tests for freelist hardening drivers/misc/lkdtm/core.c | 5 +++ drivers/misc/lkdtm/heap.c | 72 ++++++++++++++++++++++++++++++++++++++ drivers/misc/lkdtm/lkdtm.h | 5 +++ mm/slab.c | 14 ++++---- mm/slab.h | 29 +++++++++------ 5 files changed, 107 insertions(+), 18 deletions(-) -- 2.17.1
