From ae8d1d0061ad7996c2c5e769e809a593544fa145 Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Mon, 26 Feb 2018 17:25:54 -0600 Subject: x86/mm/sme: Disable stack protection for mem_encrypt_identity.c Stack protection is not compatible with early boot code. All of the early SME boot code is now isolated in a separate file, mem_encrypt_identity.c, so arch/x86/mm/Makefile can be updated to turn off stack protection for the entire file. This eliminates the need to worry about other functions within the file being instrumented with stack protection (as was seen when a newer version of GCC instrumented sme_encrypt_kernel() where an older version hadn't). It also allows removal of the __nostackprotector attribute from individual functions. Signed-off-by: Tom Lendacky Signed-off-by: Thomas Gleixner Reviewed-by: Borislav Petkov Acked-by: Kirill A. Shutemov Cc: Linus Torvalds Cc: Borislav Petkov Link: https://lkml.kernel.org/r/20180226232554.14108.16881.stgit@tlendack-t1.amdoffice.net --- arch/x86/mm/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/x86/mm/Makefile') diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile index 03c6c8561623..4b101dd6e52f 100644 --- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -19,6 +19,7 @@ obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \ nostackp := $(call cc-option, -fno-stack-protector) CFLAGS_physaddr.o := $(nostackp) CFLAGS_setup_nx.o := $(nostackp) +CFLAGS_mem_encrypt_identity.o := $(nostackp) CFLAGS_fault.o := -I$(src)/../include/asm/trace -- cgit v1.2.3