hardening updates for v5.18-rc1-fix1

- Disable CONFIG_HARDENED_USERCOPY_PAGESPAN
 
 - DMA: remove CMA code when not buiding CMA
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Merge tag 'hardening-v5.18-rc1-fix1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening updates from Kees Cook:
 "This addresses an -Warray-bounds warning found under a few ARM
  defconfigs, and disables long-broken HARDENED_USERCOPY_PAGESPAN"

* tag 'hardening-v5.18-rc1-fix1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  ARM/dma-mapping: Remove CMA code when not built with CMA
  usercopy: Disable CONFIG_HARDENED_USERCOPY_PAGESPAN

arch/arm/mm/dma-mapping.c

@@ -381,6 +381,7 @@ out:
  */
 postcore_initcall(atomic_pool_init);
 
+#ifdef CONFIG_CMA_AREAS
 struct dma_contig_early_reserve {
 	phys_addr_t base;
 	unsigned long size;
@@ -435,6 +436,7 @@ void __init dma_contiguous_remap(void)
 		iotable_init(&map, 1);
 	}
 }
+#endif
 
 static int __dma_update_pte(pte_t *pte, unsigned long addr, void *data)
 {

arch/arm/mm/mm.h

@@ -88,6 +88,10 @@ extern phys_addr_t arm_lowmem_limit;
 
 void __init bootmem_init(void);
 void arm_mm_memblock_reserve(void);
+#ifdef CONFIG_CMA_AREAS
 void dma_contiguous_remap(void);
+#else
+static inline void dma_contiguous_remap(void) { }
+#endif
 
 unsigned long __clear_cr(unsigned long mask);

include/linux/cma.h

@@ -12,10 +12,6 @@
  */
 #ifdef CONFIG_CMA_AREAS
 #define MAX_CMA_AREAS	(1 + CONFIG_CMA_AREAS)
-
-#else
-#define MAX_CMA_AREAS	(0)
-
 #endif
 
 #define CMA_MAX_NAME 64

security/Kconfig

@@ -166,7 +166,7 @@ config HARDENED_USERCOPY
 config HARDENED_USERCOPY_PAGESPAN
 	bool "Refuse to copy allocations that span multiple pages"
 	depends on HARDENED_USERCOPY
-	depends on EXPERT
+	depends on BROKEN
 	help
 	  When a multi-page allocation is done without __GFP_COMP,
 	  hardened usercopy will reject attempts to copy it. There are,