[PATCH v2 1/1] s390/kexec: Make KEXEC_SIG available when CONFIG_MODULES=n

[Alexander Egorenkov <egorenar@linux.ibm.com>]

The commit c8424e776b09 ("MODSIGN: Export module signature definitions")
replaced the dependency of KEXEC_SIG on SYSTEM_DATA_VERIFICATION with
the dependency on MODULE_SIG_FORMAT. This change disables KEXEC_SIG
in s390 kernels built with MODULES=n if nothing else selects
MODULE_SIG_FORMAT.

Furthermore, the signature verification in s390 kexec does not require
MODULE_SIG_FORMAT because it requires only the struct module_signature and,
therefore, does not depend on code in kernel/module_signature.c.

But making ARCH_SUPPORTS_KEXEC_SIG depend on SYSTEM_DATA_VERIFICATION
is also incorrect because it makes KEXEC_SIG available on s390 only
if some other arbitrary option (for instance a file system or device driver)
selects it directly or indirectly.

To properly make KEXEC_SIG available for s390 kernels built with MODULES=y
as well as MODULES=n _and_ also not depend on arbitrary options selecting
SYSTEM_DATA_VERIFICATION, we set ARCH_SUPPORTS_KEXEC_SIG=y for s390 and
select SYSTEM_DATA_VERIFICATION when KEXEC_SIG=y.

Fixes: c8424e776b09 ("MODSIGN: Export module signature definitions")
Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
---

Changes v1 -> v2:
- Let S390 config option select SYSTEM_DATA_VERIFICATION if KEXEC_SIG is selected

 arch/s390/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index c2c7bf974397..edc927d9e85a 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -279,6 +279,7 @@ config S390
 	select SPARSE_IRQ
 	select SWIOTLB
 	select SYSCTL_EXCEPTION_TRACE
+	select SYSTEM_DATA_VERIFICATION if KEXEC_SIG
 	select THREAD_INFO_IN_TASK
 	select TRACE_IRQFLAGS_SUPPORT
 	select TTY
@@ -313,7 +314,7 @@ config ARCH_SUPPORTS_KEXEC_FILE
 	def_bool y
 
 config ARCH_SUPPORTS_KEXEC_SIG
-	def_bool MODULE_SIG_FORMAT
+	def_bool y
 
 config ARCH_SUPPORTS_KEXEC_PURGATORY
 	def_bool y
-- 
2.51.0