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kasan: allow VMAP_STACK for HW_TAGS mode 

Even though hardware tag-based mode currently doesn't support checking
vmalloc allocations, it doesn't use shadow memory and works with
VMAP_STACK as is. Change VMAP_STACK definition accordingly.

Link: https://lkml.kernel.org/r/ecdb2a1658ebd88eb276dee2493518ac0e82de41.1606162397.git.andreyknvl@google.com
Link: https://linux-review.googlesource.com/id/I3552cbc12321dec82cd7372676e9372a2eb452ac
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2020-12-22 12:02:45 -08:00 committed by Linus Torvalds
parent d56a9ef84b
commit 38dd767dae
1 changed files with 4 additions and 4 deletions
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8
arch/Kconfig
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@ -976,16 +976,16 @@ config VMAP_STACK
default y default y
bool "Use a virtually-mapped stack" bool "Use a virtually-mapped stack"
depends on HAVE_ARCH_VMAP_STACK depends on HAVE_ARCH_VMAP_STACK
depends on !KASAN || KASAN_VMALLOC depends on !KASAN || KASAN_HW_TAGS || KASAN_VMALLOC
help help
Enable this if you want the use virtually-mapped kernel stacks Enable this if you want the use virtually-mapped kernel stacks
with guard pages. This causes kernel stack overflows to be with guard pages. This causes kernel stack overflows to be
caught immediately rather than causing difficult-to-diagnose caught immediately rather than causing difficult-to-diagnose
corruption. corruption.
To use this with KASAN, the architecture must support backing To use this with software KASAN modes, the architecture must support
virtual mappings with real shadow memory, and KASAN_VMALLOC must backing virtual mappings with real shadow memory, and KASAN_VMALLOC
be enabled. must be enabled.
config ARCH_OPTIONAL_KERNEL_RWX config ARCH_OPTIONAL_KERNEL_RWX
def_bool n def_bool n