x86/Kconfig: only enable ROX cache in execmem when STRICT_MODULE_RWX is set

jira LE-4694
Rebuild_History Non-Buildable kernel-6.12.0-55.43.1.el10_0
commit-author Mike Rapoport (Microsoft) <rppt@kernel.org>
commit 47410d8

Currently ROX cache in execmem is enabled regardless of
STRICT_MODULE_RWX setting. This breaks an assumption that module memory
is writable when STRICT_MODULE_RWX is disabled, for instance for kernel
debuggin.

Only enable ROX cache in execmem when STRICT_MODULE_RWX is set to
restore the original behaviour of module text permissions.

Fixes: 64f6a4e ("x86: re-enable EXECMEM_ROX support")
	Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
	Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
	Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20250603111446.2609381-3-rppt@kernel.org
(cherry picked from commit 47410d8)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

arch/x86/Kconfig

@@ -83,7 +83,7 @@ config X86
 	select ARCH_HAS_DMA_OPS			if GART_IOMMU || XEN
 	select ARCH_HAS_EARLY_DEBUG		if KGDB
 	select ARCH_HAS_ELF_RANDOMIZE
-	select ARCH_HAS_EXECMEM_ROX		if X86_64
+	select ARCH_HAS_EXECMEM_ROX		if X86_64 && STRICT_MODULE_RWX
 	select ARCH_HAS_FAST_MULTIPLIER
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL