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kasan: show gcc version requirements in Kconfig and Documentation
The documentation shows a need for gcc > 4.9.2, but it's really >=. The Kconfig entries don't show require versions so add them. Correct a latter/later typo too. Also mention that gcc 5 required to catch out of bounds accesses to global and stack variables. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -9,7 +9,9 @@ a fast and comprehensive solution for finding use-after-free and out-of-bounds
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bugs.
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KASan uses compile-time instrumentation for checking every memory access,
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therefore you will need a certain version of GCC > 4.9.2
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therefore you will need a gcc version of 4.9.2 or later. KASan could detect out
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of bounds accesses to stack or global variables, but only if gcc 5.0 or later was
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used to built the kernel.
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Currently KASan is supported only for x86_64 architecture and requires that the
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kernel be built with the SLUB allocator.
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@ -23,8 +25,8 @@ To enable KASAN configure kernel with:
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and choose between CONFIG_KASAN_OUTLINE and CONFIG_KASAN_INLINE. Outline/inline
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is compiler instrumentation types. The former produces smaller binary the
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latter is 1.1 - 2 times faster. Inline instrumentation requires GCC 5.0 or
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latter.
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latter is 1.1 - 2 times faster. Inline instrumentation requires a gcc version
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of 5.0 or later.
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Currently KASAN works only with the SLUB memory allocator.
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For better bug detection and nicer report, enable CONFIG_STACKTRACE and put
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@ -10,8 +10,11 @@ config KASAN
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help
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Enables kernel address sanitizer - runtime memory debugger,
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designed to find out-of-bounds accesses and use-after-free bugs.
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This is strictly debugging feature. It consumes about 1/8
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of available memory and brings about ~x3 performance slowdown.
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This is strictly a debugging feature and it requires a gcc version
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of 4.9.2 or later. Detection of out of bounds accesses to stack or
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global variables requires gcc 5.0 or later.
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This feature consumes about 1/8 of available memory and brings about
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~x3 performance slowdown.
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For better error detection enable CONFIG_STACKTRACE,
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and add slub_debug=U to boot cmdline.
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@ -40,6 +43,7 @@ config KASAN_INLINE
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memory accesses. This is faster than outline (in some workloads
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it gives about x2 boost over outline instrumentation), but
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make kernel's .text size much bigger.
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This requires a gcc version of 5.0 or later.
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endchoice
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