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arm64: Add support for STACKLEAK gcc plugin

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This adds support for the STACKLEAK gcc plugin to arm64 by implementing
stackleak_check_alloca(), based heavily on the x86 version, and adding the
two helpers used by the stackleak common code: current_top_of_stack() and
on_thread_stack(). The stack erasure calls are made at syscall returns.
Additionally, this disables the plugin in hypervisor and EFI stub code,
which are out of scope for the protection.

Acked-by: Alexander Popov <[email protected]>
Reviewed-by: Mark Rutland <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Laura Abbott <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Laura Abbott 2018-07-20 14:41:54 -07:00 • committed by Will Deacon
commit 0b3e336601
6 changed files with 45 additions and 2 deletions
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3
drivers/firmware/efi/libstub/Makefile
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@ -20,7 +20,8 @@ cflags-$(CONFIG_EFI_ARMSTUB) += -I$(srctree)/scripts/dtc/libfdt
KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
-D__NO_FORTIFY \
$(call cc-option,-ffreestanding) \
$(call cc-option,-fno-stack-protector)
$(call cc-option,-fno-stack-protector) \
$(DISABLE_STACKLEAK_PLUGIN)
GCOV_PROFILE := n
KASAN_SANITIZE := n