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 OII/ejdw 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2025-02-06 at 00:45:01 +0100, Andrey Konovalov wrote: >On Tue, Feb 4, 2025 at 6:35 PM Maciej Wieczor-Retman > wrote: >> >> In KASAN's tag-based mode (arm64) when a memory access occurs, the tag >> stored in the top 8 bits of the pointer is compared with tags saved in >> the region of the shadow memory that maps to memory the pointer points >> to. If any of the tags in the shadow memory region do not match the one >> stored in the pointer an error report is generated. >> >> With the introduction of the dense mode, tags won't necessarily occupy >> whole bytes of shadow memory if the previously allocated memory wasn't >> aligned to 32 bytes - which is the coverage of one shadow byte. >> >> Add an alternative implementation of kasan_check_range() that performs >> special checks on first and last bytes of shadow memory ranges if the >> originally allocated memory wasn't aligned to 32 bytes. >> >> Signed-off-by: Maciej Wieczor-Retman >> --- >> include/linux/kasan.h | 47 +++++++++++++++------- >> mm/kasan/Makefile | 3 ++ >> mm/kasan/dense.c | 83 +++++++++++++++++++++++++++++++++++++++ >> mm/kasan/kasan.h | 2 +- >> mm/kasan/report.c | 2 +- >> mm/kasan/report_sw_tags.c | 12 ++---- >> mm/kasan/sw_tags.c | 8 ++++ >> 7 files changed, 133 insertions(+), 24 deletions(-) >> create mode 100644 mm/kasan/dense.c >> >> diff --git a/include/linux/kasan.h b/include/linux/kasan.h >> index ea0f5acd875b..5a3e9bec21c2 100644 >> --- a/include/linux/kasan.h >> +++ b/include/linux/kasan.h >> @@ -33,6 +33,20 @@ typedef unsigned int __bitwise kasan_vmalloc_flags_t; >> >> #include >> >> +#ifndef kasan_mem_to_shadow >> +static inline void *kasan_mem_to_shadow(const void *addr) >> +{ >> + void *scaled; >> + >> + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) >> + scaled = (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT); >> + else >> + scaled = (void *)((long)addr >> KASAN_SHADOW_SCALE_SHIFT); >> + >> + return KASAN_SHADOW_OFFSET + scaled; >> +} >> +#endif > >Any reason this is moved up here? I think it was necessary for something I added, removed and then didn't notice it's no longer needed. I'll move it back. -- Kind regards Maciej Wieczór-Retman