Commit-ID: a980ce352fcd408d30b044455e5f6e959d6258b6 Gitweb: http://git.kernel.org/tip/a980ce352fcd408d30b044455e5f6e959d6258b6 Author: H.J. Lu <hjl.tools@xxxxxxxxx> AuthorDate: Fri, 18 Nov 2016 13:07:19 -0800 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Mon, 21 Nov 2016 11:05:28 +0100 x86/build: Build compressed x86 kernels as PIE when !CONFIG_RELOCATABLE as well Since the bootloader may load the compressed x86 kernel at any address, it should always be built as PIE, not just when CONFIG_RELOCATABLE=y. Otherwise, linker in binutils 2.27 will optimize GOT load into the absolute address when building the compressed x86 kernel as a non-PIE executable. Signed-off-by: H.J. Lu <hjl.tools@xxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: linux-kernel@xxxxxxxxxxxxxxx [ Small wording changes. ] Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/boot/compressed/Makefile | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 536ccfc..34d9e15 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -40,8 +40,8 @@ GCOV_PROFILE := n UBSAN_SANITIZE :=n LDFLAGS := -m elf_$(UTS_MACHINE) -ifeq ($(CONFIG_RELOCATABLE),y) -# If kernel is relocatable, build compressed kernel as PIE. +# Compressed kernel should be built as PIE since it may be loaded at any +# address by the bootloader. ifeq ($(CONFIG_X86_32),y) LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker) else @@ -51,7 +51,6 @@ else LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \ && echo "-z noreloc-overflow -pie --no-dynamic-linker") endif -endif LDFLAGS_vmlinux := -T hostprogs-y := mkpiggy -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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