The following commit has been merged into the core/build branch of tip: Commit-ID: 6e0a66d10c5b629369afa47b753d0ec46fa812dd Gitweb: https://git.kernel.org/tip/6e0a66d10c5b629369afa47b753d0ec46fa812dd Author: Kees Cook <keescook@xxxxxxxxxxxx> AuthorDate: Fri, 21 Aug 2020 12:42:51 -07:00 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitterDate: Tue, 01 Sep 2020 09:50:36 +02:00 arm64/build: Remove .eh_frame* sections due to unwind tables Avoid .eh_frame* section generation by making sure both CFLAGS and AFLAGS contain -fno-asychronous-unwind-tables and -fno-unwind-tables. With all sources of .eh_frame now removed from the build, drop this DISCARD so we can be alerted in the future if it returns unexpectedly once orphan section warnings have been enabled. Suggested-by: Ard Biesheuvel <ardb@xxxxxxxxxx> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Acked-by: Will Deacon <will@xxxxxxxxxx> Link: https://lore.kernel.org/r/20200821194310.3089815-11-keescook@xxxxxxxxxxxx --- arch/arm64/Makefile | 5 ++++- arch/arm64/kernel/vmlinux.lds.S | 1 - 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 55bc854..6de7f55 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -47,13 +47,16 @@ endif KBUILD_CFLAGS += -mgeneral-regs-only \ $(compat_vdso) $(cc_has_k_constraint) -KBUILD_CFLAGS += -fno-asynchronous-unwind-tables KBUILD_CFLAGS += $(call cc-disable-warning, psabi) KBUILD_AFLAGS += $(compat_vdso) KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) +# Avoid generating .eh_frame* sections. +KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables +KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables + ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) prepare: stack_protector_prepare stack_protector_prepare: prepare0 diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 13fc2ec..c2b8426 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -94,7 +94,6 @@ SECTIONS *(.discard.*) *(.interp .dynamic) *(.dynsym .dynstr .hash .gnu.hash) - *(.eh_frame) } . = KIMAGE_VADDR + TEXT_OFFSET;
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