RFC slab: Allocate and use per-call-site caches

Hi,

Here's my current progress on using per-call-site kmalloc caches (instead of KMALLOC_NORMAL), as a defense against the common heap-grooming attacks that construct malicious objects in the same cache as a target object.

I'd like to get feedback on the general approach before I continue with it. I've noted in the later patches what additional improvements I'd like to make. The first 3 patches are relatively small infrastructure changes.

Thanks!

-Kees

Kees Cook (5):
slab: Introduce kmem_buckets_destroy()
codetag: Run module_load hooks for builtin codetags
codetag: Introduce codetag_early_walk()
alloc_tag: Track fixed vs dynamic sized kmalloc calls
slab: Allocate and use per-call-site caches

 include/linux/alloc_tag.h |  38 +++++++++--
 include/linux/codetag.h   |   2 +
 include/linux/slab.h      |  17 ++---
 lib/alloc_tag.c           | 129 +++++++++++++++++++++++++++++++++++---
 lib/codetag.c             |  21 +++++--
 mm/Kconfig                |  25 ++++++++
 mm/slab_common.c          |  18 +++++-
 mm/slub.c                 |  31 ++++++++-
 8 files changed, 253 insertions(+), 28 deletions(-)

2.34.1