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Re: [PATCH] Add support for KernelAddressSanitizer


On Fri, Jul 18, 2014 at 03:40:15PM +0400, Yury Gribov wrote:
> This tiny patch adds support for KernelASan. KASan brings Asan error
> detection capabilities to Linux kernel
> (https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerForKernel).
> 
> KASan works similar to normal userspace ASan but disables some options which
> are not yet supported by kernel (notably inline instrumentation,
> stack/global protection and UAR). We would prefer to hide all necessary
> tweaks under a user-friendly flag (-fsanitize=kernel-address) instead of
> forcing them directly in kernel's CFLAGS.
> 
> Kernel patches are currently under review in LKML
> (https://lkml.org/lkml/2014/7/9/990).

I thought KAsan used different entry points (__kasan_* etc.), has that
changed?

Also, oring in SANITIZER_ADDRESS means you add -lasan to link flags, I'd
guess that for -fsanitize=kernel-address you don't want to add any libraries
at link time?

Do you error out on -fsanitize=thread -fsanitize=kernel-address ?
Perhaps -fsanitize=kernel-address -fsanitize=address should be invalid too?

	Jakub


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