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[mm,v4,05/19] kasan: allow VMAP_STACK for HW_TAGS mode

Message ID ecdb2a1658ebd88eb276dee2493518ac0e82de41.1606162397.git.andreyknvl@google.com (mailing list archive)
State New, archived
Headers show
Series kasan: boot parameters for hardware tag-based mode | expand

Commit Message

Andrey Konovalov Nov. 23, 2020, 8:14 p.m. UTC 
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.

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>
Link: https://linux-review.googlesource.com/id/I3552cbc12321dec82cd7372676e9372a2eb452ac
---
 arch/Kconfig | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/Kconfig b/arch/Kconfig
index 762096e4ec16..6092102b29e9 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -955,16 +955,16 @@  config VMAP_STACK
 	default y
 	bool "Use a virtually-mapped stack"
 	depends on HAVE_ARCH_VMAP_STACK
-	depends on !KASAN || KASAN_VMALLOC
+	depends on !KASAN || KASAN_HW_TAGS || KASAN_VMALLOC
 	help
 	  Enable this if you want the use virtually-mapped kernel stacks
 	  with guard pages.  This causes kernel stack overflows to be
 	  caught immediately rather than causing difficult-to-diagnose
 	  corruption.
 
-	  To use this with KASAN, the architecture must support backing
-	  virtual mappings with real shadow memory, and KASAN_VMALLOC must
-	  be enabled.
+	  To use this with software KASAN modes, the architecture must support
+	  backing virtual mappings with real shadow memory, and KASAN_VMALLOC
+	  must be enabled.
 
 config ARCH_OPTIONAL_KERNEL_RWX
 	def_bool n