x86: Disable EXECMEM_ROX support

The whole module_writable_address() nonsense made a giant mess of
alternative.c, not to mention it still contains bugs -- notable some of the
CFI variants crash and burn.

Mike has been working on patches to clean all this up again, but given the
current state of things, this stuff just isn't ready.

Disable for now, lets try again next cycle.

Fixes: 5185e7f9f3bd ("x86/module: enable ROX caches for module text on 64 bit")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250113112934.GA8385@noisy.programming.kicks-ass.net

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9d7bd0ae48c4260f4abb6dbedc696e3915c230ea..ef6cfea9df7333c52e331f487a0b29f037a6bf14 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -83,7 +83,6 @@ 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_FAST_MULTIPLIER
        select ARCH_HAS_FORTIFY_SOURCE
        select ARCH_HAS_GCOV_PROFILE_ALL