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s390/kexec: Make KEXEC_SIG available when CONFIG_MODULES=n

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The commit c8424e776b ("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, set ARCH_SUPPORTS_KEXEC_SIG=y for s390 and select
SYSTEM_DATA_VERIFICATION when KEXEC_SIG=y.

Fixes: c8424e776b ("MODSIGN: Export module signature definitions")
Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov 2026-02-16 07:29:16 +01:00 committed by Heiko Carstens
parent ff661eeee2
commit dd3411959b
1 changed files with 2 additions and 1 deletions
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3
arch/s390/Kconfig
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@ -282,6 +282,7 @@ 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
@ -316,7 +317,7 @@ 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