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

Patrick Wang
2022-06-09T12:51:32Z

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/20220527032504.30341-1-yee.lee@mediatek.com
https://lore.kernel.org/r/9dd08bb5-f39e-53d8-f88d-bec598a08c93@gmail.com

v2: https://lore.kernel.org/r/20220603035415.1243913-1-patrick.wang.shcn@gmail.com
v1: https://lore.kernel.org/r/20220531150823.1004101-1-patrick.wang.shcn@gmail.com

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(-)

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2.25.1