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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/arm64/mm/kasan_init.c
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@@ -1,17 +1,12 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * This file contains kasan initialization code for ARM64.
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  *
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  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
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  * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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  */
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8
 
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 #define pr_fmt(fmt) "kasan: " fmt
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-#include <linux/bootmem.h>
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 #include <linux/kasan.h>
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 #include <linux/kernel.h>
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 #include <linux/sched/task.h>
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@@ -23,9 +18,10 @@
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 #include <asm/kernel-pgtable.h>
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 #include <asm/page.h>
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 #include <asm/pgalloc.h>
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-#include <asm/pgtable.h>
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 #include <asm/sections.h>
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 #include <asm/tlbflush.h>
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+
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+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
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25
 
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 static pgd_t tmp_pg_dir[PTRS_PER_PGD] __initdata __aligned(PGD_SIZE);
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27
 
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@@ -38,9 +34,27 @@
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34
 
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 static phys_addr_t __init kasan_alloc_zeroed_page(int node)
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 {
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-	void *p = memblock_virt_alloc_try_nid(PAGE_SIZE, PAGE_SIZE,
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+	void *p = memblock_alloc_try_nid(PAGE_SIZE, PAGE_SIZE,
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 					      __pa(MAX_DMA_ADDRESS),
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 					      MEMBLOCK_ALLOC_KASAN, node);
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+	if (!p)
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+		panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%llx\n",
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+		      __func__, PAGE_SIZE, PAGE_SIZE, node,
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+		      __pa(MAX_DMA_ADDRESS));
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+
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+	return __pa(p);
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+}
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+
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+static phys_addr_t __init kasan_alloc_raw_page(int node)
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+{
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+	void *p = memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE,
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+						__pa(MAX_DMA_ADDRESS),
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+						MEMBLOCK_ALLOC_KASAN, node);
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+	if (!p)
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+		panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%llx\n",
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+		      __func__, PAGE_SIZE, PAGE_SIZE, node,
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+		      __pa(MAX_DMA_ADDRESS));
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+
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 	return __pa(p);
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 }
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@@ -71,17 +85,17 @@
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 	return early ? pmd_offset_kimg(pudp, addr) : pmd_offset(pudp, addr);
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 }
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-static pud_t *__init kasan_pud_offset(pgd_t *pgdp, unsigned long addr, int node,
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+static pud_t *__init kasan_pud_offset(p4d_t *p4dp, unsigned long addr, int node,
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 				      bool early)
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 {
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-	if (pgd_none(READ_ONCE(*pgdp))) {
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+	if (p4d_none(READ_ONCE(*p4dp))) {
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 		phys_addr_t pud_phys = early ?
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 				__pa_symbol(kasan_early_shadow_pud)
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 					: kasan_alloc_zeroed_page(node);
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-		__pgd_populate(pgdp, pud_phys, PMD_TYPE_TABLE);
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+		__p4d_populate(p4dp, pud_phys, PMD_TYPE_TABLE);
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 	}
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-	return early ? pud_offset_kimg(pgdp, addr) : pud_offset(pgdp, addr);
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+	return early ? pud_offset_kimg(p4dp, addr) : pud_offset(p4dp, addr);
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 }
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 static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr,
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@@ -93,7 +107,7 @@
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 	do {
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 		phys_addr_t page_phys = early ?
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 				__pa_symbol(kasan_early_shadow_page)
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-					: kasan_alloc_zeroed_page(node);
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+					: kasan_alloc_raw_page(node);
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 		if (!early)
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 			memset(__va(page_phys), KASAN_SHADOW_INIT, PAGE_SIZE);
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 		next = addr + PAGE_SIZE;
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@@ -113,16 +127,28 @@
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 	} while (pmdp++, addr = next, addr != end && pmd_none(READ_ONCE(*pmdp)));
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 }
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129
 
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-static void __init kasan_pud_populate(pgd_t *pgdp, unsigned long addr,
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+static void __init kasan_pud_populate(p4d_t *p4dp, unsigned long addr,
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 				      unsigned long end, int node, bool early)
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 {
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 	unsigned long next;
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-	pud_t *pudp = kasan_pud_offset(pgdp, addr, node, early);
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+	pud_t *pudp = kasan_pud_offset(p4dp, addr, node, early);
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 	do {
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 		next = pud_addr_end(addr, end);
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 		kasan_pmd_populate(pudp, addr, next, node, early);
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 	} while (pudp++, addr = next, addr != end && pud_none(READ_ONCE(*pudp)));
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+}
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+
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+static void __init kasan_p4d_populate(pgd_t *pgdp, unsigned long addr,
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+				      unsigned long end, int node, bool early)
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+{
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+	unsigned long next;
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+	p4d_t *p4dp = p4d_offset(pgdp, addr);
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+
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+	do {
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+		next = p4d_addr_end(addr, end);
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+		kasan_pud_populate(p4dp, addr, next, node, early);
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+	} while (p4dp++, addr = next, addr != end);
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 }
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 static void __init kasan_pgd_populate(unsigned long addr, unsigned long end,
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@@ -134,7 +160,7 @@
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 	pgdp = pgd_offset_k(addr);
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 	do {
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 		next = pgd_addr_end(addr, end);
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-		kasan_pud_populate(pgdp, addr, next, node, early);
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+		kasan_p4d_populate(pgdp, addr, next, node, early);
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 	} while (pgdp++, addr = next, addr != end);
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 }
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@@ -143,7 +169,8 @@
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 {
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 	BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
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 		KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));
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-	BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PGDIR_SIZE));
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+	BUILD_BUG_ON(!IS_ALIGNED(_KASAN_SHADOW_START(VA_BITS), PGDIR_SIZE));
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+	BUILD_BUG_ON(!IS_ALIGNED(_KASAN_SHADOW_START(VA_BITS_MIN), PGDIR_SIZE));
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 	BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE));
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 	kasan_pgd_populate(KASAN_SHADOW_START, KASAN_SHADOW_END, NUMA_NO_NODE,
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 			   true);
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@@ -165,7 +192,7 @@
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192
 
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 	pgdp = pgd_offset_k(KASAN_SHADOW_START);
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 	pgdp_end = pgd_offset_k(KASAN_SHADOW_END);
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-	pgdp_new = pgd_offset_raw(pgdir, KASAN_SHADOW_START);
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+	pgdp_new = pgd_offset_pgd(pgdir, KASAN_SHADOW_START);
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 	do {
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 		set_pgd(pgdp_new, READ_ONCE(*pgdp));
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 	} while (pgdp++, pgdp_new++, pgdp != pgdp_end);
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@@ -183,18 +210,21 @@
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 		set_pgd(pgd_offset_k(start), __pgd(0));
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 }
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-void __init kasan_init(void)
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+static void __init kasan_init_shadow(void)
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 {
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 	u64 kimg_shadow_start, kimg_shadow_end;
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 	u64 mod_shadow_start, mod_shadow_end;
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-	struct memblock_region *reg;
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-	int i;
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+	u64 vmalloc_shadow_end;
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+	phys_addr_t pa_start, pa_end;
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+	u64 i;
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-	kimg_shadow_start = (u64)kasan_mem_to_shadow(_text) & PAGE_MASK;
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-	kimg_shadow_end = PAGE_ALIGN((u64)kasan_mem_to_shadow(_end));
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+	kimg_shadow_start = (u64)kasan_mem_to_shadow(KERNEL_START) & PAGE_MASK;
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+	kimg_shadow_end = PAGE_ALIGN((u64)kasan_mem_to_shadow(KERNEL_END));
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 	mod_shadow_start = (u64)kasan_mem_to_shadow((void *)MODULES_VADDR);
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 	mod_shadow_end = (u64)kasan_mem_to_shadow((void *)MODULES_END);
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+
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+	vmalloc_shadow_end = (u64)kasan_mem_to_shadow((void *)VMALLOC_END);
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 	/*
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 	 * We are going to perform proper setup of shadow memory.
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@@ -210,20 +240,26 @@
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 	clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
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 	kasan_map_populate(kimg_shadow_start, kimg_shadow_end,
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-			   early_pfn_to_nid(virt_to_pfn(lm_alias(_text))));
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+			   early_pfn_to_nid(virt_to_pfn(lm_alias(KERNEL_START))));
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-	kasan_populate_early_shadow((void *)KASAN_SHADOW_START,
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-				    (void *)mod_shadow_start);
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-	kasan_populate_early_shadow((void *)kimg_shadow_end,
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-				    kasan_mem_to_shadow((void *)PAGE_OFFSET));
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+	kasan_populate_early_shadow(kasan_mem_to_shadow((void *)PAGE_END),
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+				   (void *)mod_shadow_start);
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-	if (kimg_shadow_start > mod_shadow_end)
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-		kasan_populate_early_shadow((void *)mod_shadow_end,
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-					    (void *)kimg_shadow_start);
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+	if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
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+		BUILD_BUG_ON(VMALLOC_START != MODULES_END);
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+		kasan_populate_early_shadow((void *)vmalloc_shadow_end,
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+					    (void *)KASAN_SHADOW_END);
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+	} else {
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+		kasan_populate_early_shadow((void *)kimg_shadow_end,
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+					    (void *)KASAN_SHADOW_END);
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+		if (kimg_shadow_start > mod_shadow_end)
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+			kasan_populate_early_shadow((void *)mod_shadow_end,
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+						    (void *)kimg_shadow_start);
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+	}
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-	for_each_memblock(memory, reg) {
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-		void *start = (void *)__phys_to_virt(reg->base);
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-		void *end = (void *)__phys_to_virt(reg->base + reg->size);
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+	for_each_mem_range(i, &pa_start, &pa_end) {
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+		void *start = (void *)__phys_to_virt(pa_start);
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+		void *end = (void *)__phys_to_virt(pa_end);
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 		if (start >= end)
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 			break;
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@@ -244,8 +280,21 @@
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 	memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE);
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 	cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
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-
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-	/* At this point kasan is fully initialized. Enable error messages */
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-	init_task.kasan_depth = 0;
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-	pr_info("KernelAddressSanitizer initialized\n");
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 }
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+
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+static void __init kasan_init_depth(void)
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+{
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+	init_task.kasan_depth = 0;
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+}
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+
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+void __init kasan_init(void)
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+{
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+	kasan_init_shadow();
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+	kasan_init_depth();
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+#if defined(CONFIG_KASAN_GENERIC)
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+	/* CONFIG_KASAN_SW_TAGS also requires kasan_init_sw_tags(). */
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+	pr_info("KernelAddressSanitizer initialized\n");
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+#endif
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+}
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+
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+#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */