ARM: implement basic NX support for kernel lowmem mappings

Add basic NX support for kernel lowmem mappings.  We mark any section
which does not overlap kernel text as non-executable, preventing it
from being used to write code and then execute directly from there.

This does not change the alignment of the sections, so the kernel
image doesn't grow significantly via this change, so we can do this
without needing a config option.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/mach/map.h

@@ -29,6 +29,7 @@ enum {
 	MT_LOW_VECTORS,
 	MT_HIGH_VECTORS,
 	MT_MEMORY_RWX,
+	MT_MEMORY_RW,
 	MT_ROM,
 	MT_MEMORY_RWX_NONCACHED,
 	MT_MEMORY_RW_DTCM,

arch/arm/mm/mmu.c

@@ -22,6 +22,7 @@
 #include <asm/cputype.h>
 #include <asm/sections.h>
 #include <asm/cachetype.h>
+#include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/smp_plat.h>
 #include <asm/tlb.h>
@@ -293,6 +294,13 @@ static struct mem_type mem_types[] = {
 		.prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
 		.domain    = DOMAIN_KERNEL,
 	},
+	[MT_MEMORY_RW] = {
+		.prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
+			     L_PTE_XN,
+		.prot_l1   = PMD_TYPE_TABLE,
+		.prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
+		.domain    = DOMAIN_KERNEL,
+	},
 	[MT_ROM] = {
 		.prot_sect = PMD_TYPE_SECT,
 		.domain    = DOMAIN_KERNEL,
@@ -410,6 +418,9 @@ static void __init build_mem_type_table(void)
 			mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_XN;
 			mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_XN;
 			mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_XN;
+
+			/* Also setup NX memory mapping */
+			mem_types[MT_MEMORY_RW].prot_sect |= PMD_SECT_XN;
 		}
 		if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
 			/*
@@ -489,6 +500,8 @@ static void __init build_mem_type_table(void)
 			mem_types[MT_DEVICE_CACHED].prot_pte |= L_PTE_SHARED;
 			mem_types[MT_MEMORY_RWX].prot_sect |= PMD_SECT_S;
 			mem_types[MT_MEMORY_RWX].prot_pte |= L_PTE_SHARED;
+			mem_types[MT_MEMORY_RW].prot_sect |= PMD_SECT_S;
+			mem_types[MT_MEMORY_RW].prot_pte |= L_PTE_SHARED;
 			mem_types[MT_MEMORY_DMA_READY].prot_pte |= L_PTE_SHARED;
 			mem_types[MT_MEMORY_RWX_NONCACHED].prot_sect |= PMD_SECT_S;
 			mem_types[MT_MEMORY_RWX_NONCACHED].prot_pte |= L_PTE_SHARED;
@@ -545,6 +558,8 @@ static void __init build_mem_type_table(void)
 	mem_types[MT_HIGH_VECTORS].prot_l1 |= ecc_mask;
 	mem_types[MT_MEMORY_RWX].prot_sect |= ecc_mask | cp->pmd;
 	mem_types[MT_MEMORY_RWX].prot_pte |= kern_pgprot;
+	mem_types[MT_MEMORY_RW].prot_sect |= ecc_mask | cp->pmd;
+	mem_types[MT_MEMORY_RW].prot_pte |= kern_pgprot;
 	mem_types[MT_MEMORY_DMA_READY].prot_pte |= kern_pgprot;
 	mem_types[MT_MEMORY_RWX_NONCACHED].prot_sect |= ecc_mask;
 	mem_types[MT_ROM].prot_sect |= cp->pmd;
@@ -1296,6 +1311,8 @@ static void __init kmap_init(void)
 static void __init map_lowmem(void)
 {
 	struct memblock_region *reg;
+	unsigned long kernel_x_start = round_down(__pa(_stext), SECTION_SIZE);
+	unsigned long kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE);
 
 	/* Map all the lowmem memory banks. */
 	for_each_memblock(memory, reg) {
@@ -1308,12 +1325,40 @@ static void __init map_lowmem(void)
 		if (start >= end)
 			break;
 
-		map.pfn = __phys_to_pfn(start);
-		map.virtual = __phys_to_virt(start);
-		map.length = end - start;
-		map.type = MT_MEMORY;
+		if (end < kernel_x_start || start >= kernel_x_end) {
+			map.pfn = __phys_to_pfn(start);
+			map.virtual = __phys_to_virt(start);
+			map.length = end - start;
+			map.type = MT_MEMORY_RWX;
 
-		create_mapping(&map);
+			create_mapping(&map);
+		} else {
+			/* This better cover the entire kernel */
+			if (start < kernel_x_start) {
+				map.pfn = __phys_to_pfn(start);
+				map.virtual = __phys_to_virt(start);
+				map.length = kernel_x_start - start;
+				map.type = MT_MEMORY_RW;
+
+				create_mapping(&map);
+			}
+
+			map.pfn = __phys_to_pfn(kernel_x_start);
+			map.virtual = __phys_to_virt(kernel_x_start);
+			map.length = kernel_x_end - kernel_x_start;
+			map.type = MT_MEMORY_RWX;
+
+			create_mapping(&map);
+
+			if (kernel_x_end < end) {
+				map.pfn = __phys_to_pfn(kernel_x_end);
+				map.virtual = __phys_to_virt(kernel_x_end);
+				map.length = end - kernel_x_end;
+				map.type = MT_MEMORY_RW;
+
+				create_mapping(&map);
+			}
+		}
 	}
 }