[v3,0/3] mm: kmemleak: store objects allocated with physical address separately and check when scan

Message

patrick wang June 9, 2022, 12:49 p.m. UTC

The kmemleak_*_phys() interface uses "min_low_pfn" and
"max_low_pfn" to check address. But on some architectures,
kmemleak_*_phys() is called before those two variables
initialized. The following steps will be taken:

1) Add OBJECT_PHYS flag and rbtree for the objects allocated
   with physical address
2) Store physical address in objects if allocated with OBJECT_PHYS
3) Check the boundary when scan instead of in kmemleak_*_phys()

This patch set will solve:
https://lore.kernel.org/r/[e-mail]
https://lore.kernel.org/r/[e-mail]

v2: https://lore.kernel.org/r/[e-mail]
v1: https://lore.kernel.org/r/[e-mail]

v2->v3:
 - remove the min_count argument to kmemleak_alloc_phys() function and assume it's 0
 - remove unused kmemleak_not_leak_phys() function
 - add functions to reduce unnecessary changes
 - remove the check for kasan_reset_tag()
 - add Fixes tag in patch 3

v1->v2:
 - add rbtree for the objects allocated with physical address
 - store physical address in objects if allocated with OBJECT_PHYS
 - check the upper object boundary as well and avoid duplicate check

Patrick Wang (3):
  mm: kmemleak: add OBJECT_PHYS flag for objects allocated with physical
    address
  mm: kmemleak: add rbtree and store physical address for objects
    allocated with PA
  mm: kmemleak: check physical address when scan

 Documentation/dev-tools/kmemleak.rst    |   1 -
 drivers/of/fdt.c                        |   2 +-
 include/linux/kmemleak.h                |   8 +-
 mm/kmemleak.c                           | 200 ++++++++++++++++--------
 mm/memblock.c                           |  14 +-
 tools/testing/memblock/linux/kmemleak.h |   2 +-
 6 files changed, 145 insertions(+), 82 deletions(-)