Nathan Chancellor c39866f268 arm/build: Always handle .ARM.exidx and .ARM.extab sections ... After turning on warnings for orphan section placement, enabling CONFIG_UNWINDER_FRAME_POINTER instead of CONFIG_UNWINDER_ARM causes thousands of warnings when clang + ld.lld are used: $ scripts/config --file arch/arm/configs/multi_v7_defconfig \ -d CONFIG_UNWINDER_ARM \ -e CONFIG_UNWINDER_FRAME_POINTER $ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- LLVM=1 defconfig zImage ld.lld: warning: init/built-in.a(main.o):(.ARM.extab) is being placed in '.ARM.extab' ld.lld: warning: init/built-in.a(main.o):(.ARM.extab.init.text) is being placed in '.ARM.extab.init.text' ld.lld: warning: init/built-in.a(main.o):(.ARM.extab.ref.text) is being placed in '.ARM.extab.ref.text' ld.lld: warning: init/built-in.a(do_mounts.o):(.ARM.extab.init.text) is being placed in '.ARM.extab.init.text' ld.lld: warning: init/built-in.a(do_mounts.o):(.ARM.extab) is being placed in '.ARM.extab' ld.lld: warning: init/built-in.a(do_mounts_rd.o):(.ARM.extab.init.text) is being placed in '.ARM.extab.init.text' ld.lld: warning: init/built-in.a(do_mounts_rd.o):(.ARM.extab) is being placed in '.ARM.extab' ld.lld: warning: init/built-in.a(do_mounts_initrd.o):(.ARM.extab.init.text) is being placed in '.ARM.extab.init.text' ld.lld: warning: init/built-in.a(initramfs.o):(.ARM.extab.init.text) is being placed in '.ARM.extab.init.text' ld.lld: warning: init/built-in.a(initramfs.o):(.ARM.extab) is being placed in '.ARM.extab' ld.lld: warning: init/built-in.a(calibrate.o):(.ARM.extab.init.text) is being placed in '.ARM.extab.init.text' ld.lld: warning: init/built-in.a(calibrate.o):(.ARM.extab) is being placed in '.ARM.extab' These sections are handled by the ARM_UNWIND_SECTIONS define, which is only added to the list of sections when CONFIG_ARM_UNWIND is set. CONFIG_ARM_UNWIND is a hidden symbol that is only selected when CONFIG_UNWINDER_ARM is set so CONFIG_UNWINDER_FRAME_POINTER never handles these sections. According to the help text of CONFIG_UNWINDER_ARM, these sections should be discarded so that the kernel image size is not affected. Fixes: 5a17850e25 ("arm/build: Warn on orphan section placement") Link: https://github.com/ClangBuiltLinux/linux/issues/1152 Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Review-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> [kees: Made the discard slightly more specific] Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20200928224854.3224862-1-natechancellor@gmail.com		2020-10-27 11:32:21 -07:00
..
.gitignore
arch_timer.c
armksyms.c
asm-offsets.c	Raise gcc version requirement to 4.9	2020-07-08 10:48:35 -07:00
atags_compat.c
atags_parse.c	initrd: remove support for multiple floppies	2020-07-30 08:22:33 +02:00
atags_proc.c
atags.h
bios32.c	ARM/PCI: Remove unused fields from struct hw_pci	2020-09-18 22:39:09 +01:00
bugs.c
cpuidle.c	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
crash_dump.c
debug.S	ARM: 9005/1: debug: Select flow control for all debug UARTs	2020-09-15 14:35:28 +01:00
devtree.c	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
dma-isa.c
dma.c
early_printk.c
efi.c
elf.c
entry-armv.S
entry-common.S
entry-ftrace.S
entry-header.S
entry-v7m.S
fiq.c	arm: fix the flush_icache_range arguments in set_fiq_handler	2020-06-08 11:05:57 -07:00
fiqasm.S
ftrace.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
head-common.S
head-inflate-data.c
head-nommu.S
head.S	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
hibernate.c
hw_breakpoint.c	ARM: 8997/2: hw_breakpoint: Handle inexact watchpoint addresses	2020-09-15 14:35:24 +01:00
hyp-stub.S
insn.c
io.c
irq.c	ARM: Remove custom IRQ stat accounting	2020-09-17 16:37:28 +01:00
isa.c
iwmmxt.S
jump_label.c
kgdb.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
machine_kexec.c	mm: remove unneeded includes of <asm/pgalloc.h>	2020-08-07 11:33:26 -07:00
Makefile
module-plts.c
module.c	mm: don't include asm/pgtable.h if linux/mm.h is already included	2020-06-09 09:39:13 -07:00
opcodes.c
paravirt.c
patch.c
perf_callchain.c
perf_event_v6.c
perf_event_v7.c
perf_event_xscale.c
perf_regs.c
pj4-cp0.c
process.c	Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-09 13:33:54 -07:00
psci_smp.c
ptrace.c	arm: switch to ->regset_get()	2020-07-27 14:31:09 -04:00
reboot.c
reboot.h
relocate_kernel.S
return_address.c
setup.c	arch, drivers: replace for_each_membock() with for_each_mem_range()	2020-10-13 18:38:35 -07:00
signal.c	tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume()	2020-10-17 15:04:36 -06:00
signal.h
sigreturn_codes.S
sleep.S
smccc-call.S
smp_scu.c
smp_tlb.c
smp_twd.c
smp.c	ARM: Handle no IPI being registered in show_ipi_list()	2020-09-28 11:32:04 +01:00
stacktrace.c	ARM: 8992/1: Fix unwind_frame for clang-built kernels	2020-07-21 16:33:40 +01:00
suspend.c	mm: remove unneeded includes of <asm/pgalloc.h>	2020-08-07 11:33:26 -07:00
swp_emulate.c	mmap locking API: use coccinelle to convert mmap_sem rwsem call sites	2020-06-09 09:39:14 -07:00
sys_arm.c
sys_oabi-compat.c
tcm.c
thumbee.c
time.c
topology.c	ARM, sched/topology: Revert back to default scheduler topology	2020-08-19 10:49:47 +02:00
traps.c	maccess: make get_kernel_nofault() check for minimal type compatibility	2020-06-18 12:10:37 -07:00
unwind.c	arm: add loglvl to unwind_backtrace()	2020-06-09 09:39:10 -07:00
v7m.c
vdso.c	ARM: 8987/1: VDSO: Fix incorrect clock_gettime64	2020-07-21 16:32:55 +01:00
vmlinux-xip.lds.S	arm/build: Assert for unwanted sections	2020-09-01 10:03:18 +02:00
vmlinux.lds.S	arm/build: Always handle .ARM.exidx and .ARM.extab sections	2020-10-27 11:32:21 -07:00
xscale-cp0.c