[PATCH -next] arm64: enable ARCH_SUPPORTS_KEXEC_SIG_FORCE for arm64

[Li Zetao]

When the CONFIG_KEXEC_SIG is enabled, an illegal image is loaded through
kexec, and the illegal image is successfully loaded. The test example is
as follows:

  # cat /sys/kernel/kexec_loaded
  0
  # kexec -s -l ./Image.illegal_signature
  # echo $?
  0
  # dmesg | tail
  PEFILE: Digest mismatch
  # cat /sys/kernel/kexec_loaded
  1

The root cause of this problem is that CONFIG_KEXEC_SIG_FORCE is not
enabled. Solve this problem by enabling the ARCH_SUPPORTS_KEXEC_SIG_FORCE
feature.

Signed-off-by: Li Zetao <lizetao1 at huawei.com>
---
 arch/arm64/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a2f8ff354ca6..9952c40a2bd8 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1549,6 +1549,9 @@ config ARCH_SELECTS_KEXEC_FILE
 config ARCH_SUPPORTS_KEXEC_SIG
 	def_bool y
 
+config ARCH_SUPPORTS_KEXEC_SIG_FORCE
+	def_bool y
+
 config ARCH_SUPPORTS_KEXEC_IMAGE_VERIFY_SIG
 	def_bool y
 
-- 
2.34.1