linux_dsm_epyc7002/arch/arm64/kernel
Linus Torvalds 050e9baa9d Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables
The changes to automatically test for working stack protector compiler
support in the Kconfig files removed the special STACKPROTECTOR_AUTO
option that picked the strongest stack protector that the compiler
supported.

That was all a nice cleanup - it makes no sense to have the AUTO case
now that the Kconfig phase can just determine the compiler support
directly.

HOWEVER.

It also meant that doing "make oldconfig" would now _disable_ the strong
stackprotector if you had AUTO enabled, because in a legacy config file,
the sane stack protector configuration would look like

  CONFIG_HAVE_CC_STACKPROTECTOR=y
  # CONFIG_CC_STACKPROTECTOR_NONE is not set
  # CONFIG_CC_STACKPROTECTOR_REGULAR is not set
  # CONFIG_CC_STACKPROTECTOR_STRONG is not set
  CONFIG_CC_STACKPROTECTOR_AUTO=y

and when you ran this through "make oldconfig" with the Kbuild changes,
it would ask you about the regular CONFIG_CC_STACKPROTECTOR (that had
been renamed from CONFIG_CC_STACKPROTECTOR_REGULAR to just
CONFIG_CC_STACKPROTECTOR), but it would think that the STRONG version
used to be disabled (because it was really enabled by AUTO), and would
disable it in the new config, resulting in:

  CONFIG_HAVE_CC_STACKPROTECTOR=y
  CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
  CONFIG_CC_STACKPROTECTOR=y
  # CONFIG_CC_STACKPROTECTOR_STRONG is not set
  CONFIG_CC_HAS_SANE_STACKPROTECTOR=y

That's dangerously subtle - people could suddenly find themselves with
the weaker stack protector setup without even realizing.

The solution here is to just rename not just the old RECULAR stack
protector option, but also the strong one.  This does that by just
removing the CC_ prefix entirely for the user choices, because it really
is not about the compiler support (the compiler support now instead
automatially impacts _visibility_ of the options to users).

This results in "make oldconfig" actually asking the user for their
choice, so that we don't have any silent subtle security model changes.
The end result would generally look like this:

  CONFIG_HAVE_CC_STACKPROTECTOR=y
  CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
  CONFIG_STACKPROTECTOR=y
  CONFIG_STACKPROTECTOR_STRONG=y
  CONFIG_CC_HAS_SANE_STACKPROTECTOR=y

where the "CC_" versions really are about internal compiler
infrastructure, not the user selections.

Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-06-14 12:21:18 +09:00
..
probes
vdso
.gitignore
acpi_numa.c
acpi_parking_protocol.c
acpi.c
alternative.c arm64: alternatives: Add dynamic patching feature 2018-03-19 13:03:17 +00:00
arm64ksyms.c arm64: export tishift functions to modules 2018-05-21 19:00:48 +01:00
armv8_deprecated.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
asm-offsets.c arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests 2018-05-31 18:00:57 +01:00
cacheinfo.c arm64: Add support for ACPI based firmware tables 2018-05-17 17:28:09 +01:00
cpu_errata.c arm64 updates for 4.18: 2018-06-08 11:10:58 -07:00
cpu_ops.c
cpu-reset.h
cpu-reset.S
cpufeature.c arm64: signal: Report signal frame size to userspace via auxv 2018-06-01 15:53:10 +01:00
cpuidle.c
cpuinfo.c arm64: Expose Arm v8.4 features 2018-03-19 18:14:27 +00:00
crash_dump.c
debug-monitors.c arm64: Use arm64_force_sig_info instead of force_sig_info 2018-03-06 18:52:32 +00:00
efi-entry.S
efi-header.S
efi-rt-wrapper.S efi/arm64: Check whether x18 is preserved by runtime services calls 2018-03-09 08:58:22 +01:00
efi.c efi/arm64: Check whether x18 is preserved by runtime services calls 2018-03-09 08:58:22 +01:00
entry32.S
entry-fpsimd.S arm64/sve: Write ZCR_EL1 on context switch only if changed 2018-05-17 18:19:53 +01:00
entry-ftrace.S
entry.S arm64: ssbd: Introduce thread flag to control userspace mitigation 2018-05-31 17:35:32 +01:00
fpsimd.c Small update for KVM. 2018-06-12 11:34:04 -07:00
ftrace.c
head.S
hibernate-asm.S
hibernate.c arm64: ssbd: Restore mitigation status on CPU resume 2018-05-31 17:35:19 +01:00
hw_breakpoint.c compat: Move compat_timespec/ timeval to compat_time.h 2018-04-19 13:29:54 +02:00
hyp-stub.S
image.h arm64/efi: Make strrchr() available to the EFI namespace 2018-03-05 13:45:38 -06:00
insn.c arm64: insn: Allow ADD/SUB (immediate) with LSL #12 2018-03-19 13:05:13 +00:00
io.c
irq.c
jump_label.c
kaslr.c arm64/kernel: kaslr: reduce module randomization range to 4 GB 2018-03-08 13:49:26 +00:00
kgdb.c arm64/debug: Fix registers on sleeping tasks 2018-03-06 18:52:34 +00:00
kuser32.S
machine_kexec.c
Makefile arm64: ssbd: Add prctl interface for per-thread mitigation 2018-05-31 18:00:52 +01:00
module-plts.c arm64/kernel: rename module_emit_adrp_veneer->module_emit_veneer_for_adrp 2018-04-24 19:07:35 +01:00
module.c arm64/kernel: rename module_emit_adrp_veneer->module_emit_veneer_for_adrp 2018-04-24 19:07:35 +01:00
module.lds
paravirt.c
pci.c
perf_callchain.c
perf_event.c arm_pmu: simplify arm_pmu::handle_irq 2018-05-21 18:07:05 +01:00
perf_regs.c compat: Move compat_timespec/ timeval to compat_time.h 2018-04-19 13:29:54 +02:00
process.c Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables 2018-06-14 12:21:18 +09:00
psci.c
ptrace.c Small update for KVM. 2018-06-12 11:34:04 -07:00
reloc_test_core.c arm64: fix undefined reference to 'printk' 2018-03-19 18:14:25 +00:00
reloc_test_syms.S arm64: fix undefined reference to 'printk' 2018-03-19 18:14:25 +00:00
relocate_kernel.S
return_address.c
sdei.c
setup.c
signal32.c arm64: uaccess: Fix omissions from usercopy whitelist 2018-03-28 15:25:44 +01:00
signal.c arm64: Fix syscall restarting around signal suppressed by tracer 2018-06-08 13:21:39 +01:00
sleep.S
smccc-call.S
smp_spin_table.c
smp.c arm64: capabilities: Change scope of VHE to Boot CPU feature 2018-03-26 18:01:41 +01:00
ssbd.c arm64: ssbd: Add prctl interface for per-thread mitigation 2018-05-31 18:00:52 +01:00
stacktrace.c
suspend.c arm64: ssbd: Restore mitigation status on CPU resume 2018-05-31 17:35:19 +01:00
sys32.c
sys_compat.c signal: Ensure every siginfo we send has all bits initialized 2018-04-25 10:40:51 -05:00
sys.c mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff() 2018-04-02 20:16:11 +02:00
time.c
topology.c arm64: topology: Avoid checking numa mask for scheduler MC selection 2018-06-07 17:42:11 +01:00
trace-events-emulation.h
traps.c Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2018-06-04 15:23:48 -07:00
vdso.c
vmlinux.lds.S arm64: remove no-op macro VMLINUX_SYMBOL() 2018-05-15 18:14:24 +01:00