Re: [PATCH v9 1/6] kasan: allow an architecture to disable inline instrumentation
From: Christophe Leroy <hidden>
Date: 2020-12-01 16:50:39
Also in:
linux-mm, lkml
Le 01/12/2020 à 17:16, Daniel Axtens a écrit :
quoted hunk ↗ jump to hunk
For annoying architectural reasons, it's very difficult to support inline instrumentation on powerpc64. Add a Kconfig flag to allow an arch to disable inline. (It's a bit annoying to be 'backwards', but I'm not aware of any way to have an arch force a symbol to be 'n', rather than 'y'.) Signed-off-by: Daniel Axtens <redacted> --- lib/Kconfig.kasan | 4 ++++ 1 file changed, 4 insertions(+)diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index 542a9c18398e..31a0b28f6c2b 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan@@ -9,6 +9,9 @@ config HAVE_ARCH_KASAN_SW_TAGS config HAVE_ARCH_KASAN_VMALLOC bool +config HAVE_ARCH_NO_KASAN_INLINE
Maybe a better name could be: ARCH_DISABLE_KASAN_INLINE
quoted hunk ↗ jump to hunk
+ def_bool n + config CC_HAS_KASAN_GENERIC def_bool $(cc-option, -fsanitize=kernel-address)@@ -108,6 +111,7 @@ config KASAN_OUTLINE config KASAN_INLINE bool "Inline instrumentation" + depends on !HAVE_ARCH_NO_KASAN_INLINE help Compiler directly inserts code checking shadow memory before memory accesses. This is faster than outline (in some workloads