Re: [PATCH v32 19/21] selftests/x86: Add a selftest for SGX

[Sean Christopherson]

On Mon, Jun 01, 2020 at 10:52:16AM +0300, Jarkko Sakkinen wrote:
> Add a selftest for SGX. It is a trivial test where a simple enclave
> copies one 64-bit word of memory between two memory locations.

...

> --- /dev/null
> +++ b/tools/testing/selftests/sgx/Makefile
> @@ -0,0 +1,53 @@
> +top_srcdir = ../../../..
> +
> +include ../lib.mk
> +
> +.PHONY: all clean
> +
> +CAN_BUILD_X86_64 := $(shell ../x86/check_cc.sh $(CC) \
> +			    ../x86/trivial_64bit_program.c)
> +
> +ifndef OBJCOPY
> +OBJCOPY := $(CROSS_COMPILE)objcopy
> +endif
> +
> +INCLUDES := -I$(top_srcdir)/tools/include
> +HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC -z noexecstack

There's a pending pull request for 5.8[1] that includes a patch that turns
off automatic READ_IMPLIES_EXEC for x86_64[2].  Assuming that gets pulled
for 5.8, we should drop noexecstack to verify/ensure that the workaround is
no longer needed to avoid conflicts with the EPCM permissions.

[1] https://lkml.kernel.org/r/20200603213452.GG19667@xxxxxxx
[2] https://lkml.kernel.org/r/20200327064820.12602-4-keescook@xxxxxxxxxxxx