kasan: optimizations and fixes for HW_TAGS
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- v3 Latest13 patches 4 repliesIn review 11 of 13 applied
- v212 patches 4 repliesSuperseded
- v112 patches 22 repliesSuperseded
Changes in v3 from the cover letter
- Rebased onto mm.
- Add documentation update patch.
Patches in v3 11 of 13 applied
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/13 | kasan, mm: don't save alloc stacks twiceinclude/ mm/ mm/ | +24 | 0 replies | |
| 2/13 | kasan, mm: optimize kmalloc poisoningmm/ mm/ mm/ +1 more | +119 | 0 replies | Applied |
| 3/13 | kasan: optimize large kmalloc poisoningmm/ | +15 | 0 replies | Applied |
| 4/13 | kasan: clean up setting free info in kasan_slab_freemm/ | +2 | 0 replies | Applied |
| 5/13 | kasan: unify large kfree checksinclude/ mm/ | +34 | 0 replies | Applied |
| 6/13 | kasan: rework krealloc testslib/ | +81 | 0 replies | Applied |
| 7/13 | kasan, mm: fail krealloc on freed objectslib/ mm/ | +23 | 0 replies | Applied |
| 8/13 | kasan, mm: optimize krealloc poisoningmm/ mm/ | +24 | 2 replies | Applied |
| 9/13 | kasan: ensure poisoning size alignmentmm/ mm/ mm/ | +48 | 0 replies | Applied |
| 10/13 | arm64: kasan: simplify and inline MTE functionsarch/ arch/ arch/ +4 more | +60 | 0 replies | Applied |
| 11/13 | kasan: inline HW_TAGS helper functionsmm/ | +7 | 1 reply | Applied |
| 12/13 | arm64: kasan: export MTE symbols for KASAN testsarch/ | +2 | 0 replies | |
| 13/13 | kasan: clarify that only first bug is reported in HW_TAGSDocumentation/ mm/ | +7 | 1 reply | Applied |
Reviews trailers per patch
All 13 patches have a Reviewed-by or Acked-by.
| Patch | Marco Elver | Catalin Marinas |
|---|---|---|
| 1/13 | R-b | |
| 2/13 | R-b | |
| 3/13 | R-b | |
| 4/13 | R-b | |
| 5/13 | R-b | |
| 6/13 | R-b | |
| 7/13 | R-b | |
| 8/13 | R-b | |
| 9/13 | R-b | |
| 10/13 | R-b | |
| 11/13 | R-b | |
| 12/13 | R-b | |
| 13/13 | R-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH v3 mm 00/13] kasan: optimizations and fixes for HW_TAGS
This patchset makes the HW_TAGS mode more efficient, mostly by reworking poisoning approaches and simplifying/inlining some internal helpers.
With this change, the overhead of HW_TAGS annotations excluding setting and checking memory tags is ~3%. The performance impact caused by tags will be unknown until we have hardware that supports MTE.
As a side-effect, this patchset speeds up generic KASAN by ~15%.
Changes v2->v3:
- Rebased onto mm.
- Add documentation update patch.
Changes v1->v2:
- Use EXPORT_SYMBOL_GPL() for arm64 symbols.
- Rename kmalloc bool flag argument to is_kmalloc.
- Make empty mte_set_mem_tag_range() return void.
- Fix build warning in 32-bit systems by using unsigned long instead of u64 in WARN_ON() checks.
- Minor changes in comments and commit descriptions.
- Use kfence_ksize() before __ksize() to avoid crashes with KFENCE.
- Use inline instead of __always_inline.
Andrey Konovalov (13):
kasan, mm: don't save alloc stacks twice
kasan, mm: optimize kmalloc poisoning
kasan: optimize large kmalloc poisoning
kasan: clean up setting free info in kasan_slab_free
kasan: unify large kfree checks
kasan: rework krealloc tests
kasan, mm: fail krealloc on freed objects
kasan, mm: optimize krealloc poisoning
kasan: ensure poisoning size alignment
arm64: kasan: simplify and inline MTE functions
kasan: inline HW_TAGS helper functions
arm64: kasan: export MTE symbols for KASAN tests
kasan: clarify that only first bug is reported in HW_TAGS
Documentation/dev-tools/kasan.rst | 8 +- arch/arm64/include/asm/cache.h | 1 - arch/arm64/include/asm/kasan.h | 1 + arch/arm64/include/asm/mte-def.h | 2 + arch/arm64/include/asm/mte-kasan.h | 65 ++++++++-- arch/arm64/include/asm/mte.h | 2 - arch/arm64/kernel/mte.c | 48 +------- arch/arm64/lib/mte.S | 16 --- include/linux/kasan.h | 25 ++-- lib/test_kasan.c | 111 +++++++++++++++-- mm/kasan/common.c | 187 ++++++++++++++++++++--------- mm/kasan/hw_tags.c | 2 +- mm/kasan/kasan.h | 72 +++++++++-- mm/kasan/shadow.c | 53 ++++---- mm/slab_common.c | 18 ++- mm/slub.c | 3 +- 16 files changed, 425 insertions(+), 189 deletions(-)
Signature · 1 line
2.30.0.365.g02bc693789-goog