Revision c39866f268f89868df17724cd2262d121552d8c9 authored by Nathan Chancellor on 28 September 2020, 22:48:54 UTC, committed by Kees Cook on 27 October 2020, 18:32:21 UTC
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: 5a17850e251a ("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
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File | Mode | Size |
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bpf | ||
cgroup | ||
configs | ||
debug | ||
dma | ||
entry | ||
events | ||
gcov | ||
irq | ||
kcsan | ||
livepatch | ||
locking | ||
power | ||
printk | ||
rcu | ||
sched | ||
time | ||
trace | ||
.gitignore | -rw-r--r-- | 71 bytes |
Kconfig.freezer | -rw-r--r-- | 92 bytes |
Kconfig.hz | -rw-r--r-- | 1.7 KB |
Kconfig.locks | -rw-r--r-- | 4.9 KB |
Kconfig.preempt | -rw-r--r-- | 3.0 KB |
Makefile | -rw-r--r-- | 4.8 KB |
acct.c | -rw-r--r-- | 15.5 KB |
async.c | -rw-r--r-- | 10.2 KB |
audit.c | -rw-r--r-- | 63.4 KB |
audit.h | -rw-r--r-- | 10.3 KB |
audit_fsnotify.c | -rw-r--r-- | 5.2 KB |
audit_tree.c | -rw-r--r-- | 25.6 KB |
audit_watch.c | -rw-r--r-- | 13.7 KB |
auditfilter.c | -rw-r--r-- | 34.1 KB |
auditsc.c | -rw-r--r-- | 71.9 KB |
backtracetest.c | -rw-r--r-- | 1.9 KB |
bounds.c | -rw-r--r-- | 751 bytes |
capability.c | -rw-r--r-- | 14.6 KB |
compat.c | -rw-r--r-- | 7.3 KB |
configs.c | -rw-r--r-- | 2.0 KB |
context_tracking.c | -rw-r--r-- | 6.4 KB |
cpu.c | -rw-r--r-- | 60.8 KB |
cpu_pm.c | -rw-r--r-- | 5.4 KB |
crash_core.c | -rw-r--r-- | 12.8 KB |
crash_dump.c | -rw-r--r-- | 1.1 KB |
cred.c | -rw-r--r-- | 23.3 KB |
delayacct.c | -rw-r--r-- | 4.7 KB |
dma.c | -rw-r--r-- | 3.3 KB |
elfcore.c | -rw-r--r-- | 459 bytes |
exec_domain.c | -rw-r--r-- | 1.1 KB |
exit.c | -rw-r--r-- | 43.0 KB |
extable.c | -rw-r--r-- | 4.4 KB |
fail_function.c | -rw-r--r-- | 6.9 KB |
fork.c | -rw-r--r-- | 74.1 KB |
freezer.c | -rw-r--r-- | 4.4 KB |
futex.c | -rw-r--r-- | 109.1 KB |
gen_kheaders.sh | -rwxr-xr-x | 3.2 KB |
groups.c | -rw-r--r-- | 4.9 KB |
hung_task.c | -rw-r--r-- | 7.5 KB |
iomem.c | -rw-r--r-- | 4.7 KB |
irq_work.c | -rw-r--r-- | 4.8 KB |
jump_label.c | -rw-r--r-- | 20.9 KB |
kallsyms.c | -rw-r--r-- | 18.6 KB |
kcmp.c | -rw-r--r-- | 5.7 KB |
kcov.c | -rw-r--r-- | 27.7 KB |
kexec.c | -rw-r--r-- | 8.0 KB |
kexec_core.c | -rw-r--r-- | 31.2 KB |
kexec_elf.c | -rw-r--r-- | 11.4 KB |
kexec_file.c | -rw-r--r-- | 33.3 KB |
kexec_internal.h | -rw-r--r-- | 976 bytes |
kheaders.c | -rw-r--r-- | 1.6 KB |
kmod.c | -rw-r--r-- | 5.0 KB |
kprobes.c | -rw-r--r-- | 70.5 KB |
ksysfs.c | -rw-r--r-- | 6.3 KB |
kthread.c | -rw-r--r-- | 36.4 KB |
latencytop.c | -rw-r--r-- | 7.2 KB |
module-internal.h | -rw-r--r-- | 782 bytes |
module.c | -rw-r--r-- | 117.8 KB |
module_signature.c | -rw-r--r-- | 1.1 KB |
module_signing.c | -rw-r--r-- | 1.1 KB |
notifier.c | -rw-r--r-- | 16.3 KB |
nsproxy.c | -rw-r--r-- | 12.9 KB |
padata.c | -rw-r--r-- | 28.0 KB |
panic.c | -rw-r--r-- | 18.3 KB |
params.c | -rw-r--r-- | 22.8 KB |
pid.c | -rw-r--r-- | 17.0 KB |
pid_namespace.c | -rw-r--r-- | 11.3 KB |
profile.c | -rw-r--r-- | 14.8 KB |
ptrace.c | -rw-r--r-- | 36.5 KB |
range.c | -rw-r--r-- | 3.0 KB |
reboot.c | -rw-r--r-- | 14.1 KB |
regset.c | -rw-r--r-- | 1.9 KB |
relay.c | -rw-r--r-- | 32.1 KB |
resource.c | -rw-r--r-- | 45.4 KB |
rseq.c | -rw-r--r-- | 9.8 KB |
scftorture.c | -rw-r--r-- | 16.9 KB |
scs.c | -rw-r--r-- | 1.9 KB |
seccomp.c | -rw-r--r-- | 54.2 KB |
signal.c | -rw-r--r-- | 118.8 KB |
smp.c | -rw-r--r-- | 26.7 KB |
smpboot.c | -rw-r--r-- | 11.7 KB |
smpboot.h | -rw-r--r-- | 640 bytes |
softirq.c | -rw-r--r-- | 18.1 KB |
stackleak.c | -rw-r--r-- | 3.6 KB |
stacktrace.c | -rw-r--r-- | 9.6 KB |
static_call.c | -rw-r--r-- | 10.6 KB |
stop_machine.c | -rw-r--r-- | 17.2 KB |
sys.c | -rw-r--r-- | 62.9 KB |
sys_ni.c | -rw-r--r-- | 9.9 KB |
sysctl-test.c | -rw-r--r-- | 10.8 KB |
sysctl.c | -rw-r--r-- | 80.2 KB |
task_work.c | -rw-r--r-- | 4.3 KB |
taskstats.c | -rw-r--r-- | 15.2 KB |
test_kprobes.c | -rw-r--r-- | 5.9 KB |
torture.c | -rw-r--r-- | 21.7 KB |
tracepoint.c | -rw-r--r-- | 15.6 KB |
tsacct.c | -rw-r--r-- | 4.7 KB |
ucount.c | -rw-r--r-- | 5.6 KB |
uid16.c | -rw-r--r-- | 5.1 KB |
uid16.h | -rw-r--r-- | 442 bytes |
umh.c | -rw-r--r-- | 15.0 KB |
up.c | -rw-r--r-- | 2.3 KB |
user-return-notifier.c | -rw-r--r-- | 1.3 KB |
user.c | -rw-r--r-- | 5.5 KB |
user_namespace.c | -rw-r--r-- | 33.2 KB |
usermode_driver.c | -rw-r--r-- | 4.1 KB |
utsname.c | -rw-r--r-- | 3.8 KB |
utsname_sysctl.c | -rw-r--r-- | 3.2 KB |
watch_queue.c | -rw-r--r-- | 16.4 KB |
watchdog.c | -rw-r--r-- | 20.1 KB |
watchdog_hld.c | -rw-r--r-- | 7.7 KB |
workqueue.c | -rw-r--r-- | 165.8 KB |
workqueue_internal.h | -rw-r--r-- | 2.4 KB |
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