Unverified Commit 40284a07 authored Jul 29, 2020 by Tobias Klauser Committed by Palmer Dabbelt Aug 04, 2020

riscv: disable stack-protector for vDSO

Currently, building the vDSO with clang leads assembler errors like the
following:

  /tmp/vgettimeofday-1ae0d2.s: Assembler messages:
  /tmp/vgettimeofday-1ae0d2.s:28: Error: bad expression
  /tmp/vgettimeofday-1ae0d2.s:28: Error: illegal operands `auipc a2,%got_pcrel_hi(__stack_chk_guard)'

Disable the stack-protector for vDSO to fix these.

Link: https://github.com/ClangBuiltLinux/linux/issues/1112


Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

parent 635093e3

arch/riscv/kernel/vdso/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,8 @@ vdso-syms += flush_icache
		# Files to link into the vdso
		obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o

		ccflags-y := -fno-stack-protector

		ifneq ($(c-gettimeofday-y),)
		CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
		endif

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