@@ -48,6 +48,7 @@ GCOV_PROFILE := n
UBSAN_SANITIZE :=n
KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
+KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info)
# Compressed kernel should be built as PIE since it may be loaded at any
# address by the bootloader.
ifeq ($(CONFIG_X86_32),y)
@@ -59,7 +60,7 @@ else
KBUILD_LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \
&& echo "-z noreloc-overflow -pie --no-dynamic-linker")
endif
-LDFLAGS_vmlinux := -T
+LDFLAGS_vmlinux := --orphan-handling=warn -T
hostprogs := mkpiggy
HOST_EXTRACFLAGS += -I$(srctree)/tools/include
@@ -75,7 +75,17 @@ SECTIONS
. = ALIGN(PAGE_SIZE); /* keep ZO size page aligned */
_end = .;
+ STABS_DEBUG
+ DWARF_DEBUG
ELF_DETAILS
DISCARDS
+ /DISCARD/ : {
+ *(.note.*)
+ *(.rela.*) *(.rela_*)
+ *(.rel.*) *(.rel_*)
+ *(.plt) *(.plt.*)
+ *(.dyn*)
+ *(.hash) *(.gnu.hash)
+ }
}
We don't want to depend on the linker's orphan section placement heuristics as these can vary between linkers, and may change between versions. All sections need to be explicitly named in the linker script. Add the common debugging sections. Discard the unused note, rel, plt, dyn, and hash sections that are not needed in the compressed vmlinux. Disable .eh_frame generation in the linker and enable orphan section warnings. Signed-off-by: Kees Cook <keescook@chromium.org> --- arch/x86/boot/compressed/Makefile | 3 ++- arch/x86/boot/compressed/vmlinux.lds.S | 10 ++++++++++ 2 files changed, 12 insertions(+), 1 deletion(-)