[linux-2.6-block.git] / arch / riscv / mm / kasan_init.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2019 Andes Technology Corporation

#include <linux/pfn.h>
#include <linux/init_task.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/fixmap.h>
#include <asm/pgalloc.h>

/*
 * Kasan shadow region must lie at a fixed address across sv39, sv48 and sv57
 * which is right before the kernel.
 *
 * For sv39, the region is aligned on PGDIR_SIZE so we only need to populate
 * the page global directory with kasan_early_shadow_pmd.
 *
 * For sv48 and sv57, the region start is aligned on PGDIR_SIZE whereas the end
 * region is not and then we have to go down to the PUD level.
 */

static pgd_t tmp_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
static p4d_t tmp_p4d[PTRS_PER_P4D] __page_aligned_bss;
static pud_t tmp_pud[PTRS_PER_PUD] __page_aligned_bss;

static void __init kasan_populate_pte(pmd_t *pmd, unsigned long vaddr, unsigned long end)
{
	phys_addr_t phys_addr;
	pte_t *ptep, *p;

	if (pmd_none(*pmd)) {
		p = memblock_alloc(PTRS_PER_PTE * sizeof(pte_t), PAGE_SIZE);
		set_pmd(pmd, pfn_pmd(PFN_DOWN(__pa(p)), PAGE_TABLE));
	}

	ptep = pte_offset_kernel(pmd, vaddr);

	do {
		if (pte_none(*ptep)) {
			phys_addr = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
			set_pte(ptep, pfn_pte(PFN_DOWN(phys_addr), PAGE_KERNEL));
			memset(__va(phys_addr), KASAN_SHADOW_INIT, PAGE_SIZE);
		}
	} while (ptep++, vaddr += PAGE_SIZE, vaddr != end);
}

static void __init kasan_populate_pmd(pud_t *pud, unsigned long vaddr, unsigned long end)
{
	phys_addr_t phys_addr;
	pmd_t *pmdp, *p;
	unsigned long next;

	if (pud_none(*pud)) {
		p = memblock_alloc(PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE);
		set_pud(pud, pfn_pud(PFN_DOWN(__pa(p)), PAGE_TABLE));
	}

	pmdp = pmd_offset(pud, vaddr);

	do {
		next = pmd_addr_end(vaddr, end);

		if (pmd_none(*pmdp) && IS_ALIGNED(vaddr, PMD_SIZE) && (next - vaddr) >= PMD_SIZE) {
			phys_addr = memblock_phys_alloc(PMD_SIZE, PMD_SIZE);
			if (phys_addr) {
				set_pmd(pmdp, pfn_pmd(PFN_DOWN(phys_addr), PAGE_KERNEL));
				memset(__va(phys_addr), KASAN_SHADOW_INIT, PMD_SIZE);
				continue;
			}
		}

		kasan_populate_pte(pmdp, vaddr, next);
	} while (pmdp++, vaddr = next, vaddr != end);
}

static void __init kasan_populate_pud(p4d_t *p4d,
				      unsigned long vaddr, unsigned long end)
{
	phys_addr_t phys_addr;
	pud_t *pudp, *p;
	unsigned long next;

	if (p4d_none(*p4d)) {
		p = memblock_alloc(PTRS_PER_PUD * sizeof(pud_t), PAGE_SIZE);
		set_p4d(p4d, pfn_p4d(PFN_DOWN(__pa(p)), PAGE_TABLE));
	}

	pudp = pud_offset(p4d, vaddr);

	do {
		next = pud_addr_end(vaddr, end);

		if (pud_none(*pudp) && IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE) {
			phys_addr = memblock_phys_alloc(PUD_SIZE, PUD_SIZE);
			if (phys_addr) {
				set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_KERNEL));
				memset(__va(phys_addr), KASAN_SHADOW_INIT, PUD_SIZE);
				continue;
			}
		}

		kasan_populate_pmd(pudp, vaddr, next);
	} while (pudp++, vaddr = next, vaddr != end);
}

static void __init kasan_populate_p4d(pgd_t *pgd,
				      unsigned long vaddr, unsigned long end)
{
	phys_addr_t phys_addr;
	p4d_t *p4dp, *p;
	unsigned long next;

	if (pgd_none(*pgd)) {
		p = memblock_alloc(PTRS_PER_P4D * sizeof(p4d_t), PAGE_SIZE);
		set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
	}

	p4dp = p4d_offset(pgd, vaddr);

	do {
		next = p4d_addr_end(vaddr, end);

		if (p4d_none(*p4dp) && IS_ALIGNED(vaddr, P4D_SIZE) && (next - vaddr) >= P4D_SIZE) {
			phys_addr = memblock_phys_alloc(P4D_SIZE, P4D_SIZE);
			if (phys_addr) {
				set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_KERNEL));
				memset(__va(phys_addr), KASAN_SHADOW_INIT, P4D_SIZE);
				continue;
			}
		}

		kasan_populate_pud(p4dp, vaddr, next);
	} while (p4dp++, vaddr = next, vaddr != end);
}

static void __init kasan_populate_pgd(pgd_t *pgdp,
				      unsigned long vaddr, unsigned long end)
{
	phys_addr_t phys_addr;
	unsigned long next;

	do {
		next = pgd_addr_end(vaddr, end);

		if (pgd_none(*pgdp) && IS_ALIGNED(vaddr, PGDIR_SIZE) &&
		    (next - vaddr) >= PGDIR_SIZE) {
			phys_addr = memblock_phys_alloc(PGDIR_SIZE, PGDIR_SIZE);
			if (phys_addr) {
				set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_KERNEL));
				memset(__va(phys_addr), KASAN_SHADOW_INIT, PGDIR_SIZE);
				continue;
			}
		}

		kasan_populate_p4d(pgdp, vaddr, next);
	} while (pgdp++, vaddr = next, vaddr != end);
}

static void __init kasan_early_clear_pud(p4d_t *p4dp,
					 unsigned long vaddr, unsigned long end)
{
	pud_t *pudp, *base_pud;
	unsigned long next;

	if (!pgtable_l4_enabled) {
		pudp = (pud_t *)p4dp;
	} else {
		base_pud = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(*p4dp)));
		pudp = base_pud + pud_index(vaddr);
	}

	do {
		next = pud_addr_end(vaddr, end);

		if (IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE) {
			pud_clear(pudp);
			continue;
		}

		BUG();
	} while (pudp++, vaddr = next, vaddr != end);
}

static void __init kasan_early_clear_p4d(pgd_t *pgdp,
					 unsigned long vaddr, unsigned long end)
{
	p4d_t *p4dp, *base_p4d;
	unsigned long next;

	if (!pgtable_l5_enabled) {
		p4dp = (p4d_t *)pgdp;
	} else {
		base_p4d = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgdp)));
		p4dp = base_p4d + p4d_index(vaddr);
	}

	do {
		next = p4d_addr_end(vaddr, end);

		if (pgtable_l4_enabled && IS_ALIGNED(vaddr, P4D_SIZE) &&
		    (next - vaddr) >= P4D_SIZE) {
			p4d_clear(p4dp);
			continue;
		}

		kasan_early_clear_pud(p4dp, vaddr, next);
	} while (p4dp++, vaddr = next, vaddr != end);
}

static void __init kasan_early_clear_pgd(pgd_t *pgdp,
					 unsigned long vaddr, unsigned long end)
{
	unsigned long next;

	do {
		next = pgd_addr_end(vaddr, end);

		if (pgtable_l5_enabled && IS_ALIGNED(vaddr, PGDIR_SIZE) &&
		    (next - vaddr) >= PGDIR_SIZE) {
			pgd_clear(pgdp);
			continue;
		}

		kasan_early_clear_p4d(pgdp, vaddr, next);
	} while (pgdp++, vaddr = next, vaddr != end);
}

static void __init kasan_early_populate_pud(p4d_t *p4dp,
					    unsigned long vaddr,
					    unsigned long end)
{
	pud_t *pudp, *base_pud;
	phys_addr_t phys_addr;
	unsigned long next;

	if (!pgtable_l4_enabled) {
		pudp = (pud_t *)p4dp;
	} else {
		base_pud = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(*p4dp)));
		pudp = base_pud + pud_index(vaddr);
	}

	do {
		next = pud_addr_end(vaddr, end);

		if (pud_none(*pudp) && IS_ALIGNED(vaddr, PUD_SIZE) &&
		    (next - vaddr) >= PUD_SIZE) {
			phys_addr = __pa((uintptr_t)kasan_early_shadow_pmd);
			set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_TABLE));
			continue;
		}

		BUG();
	} while (pudp++, vaddr = next, vaddr != end);
}

static void __init kasan_early_populate_p4d(pgd_t *pgdp,
					    unsigned long vaddr,
					    unsigned long end)
{
	p4d_t *p4dp, *base_p4d;
	phys_addr_t phys_addr;
	unsigned long next;

	/*
	 * We can't use pgd_page_vaddr here as it would return a linear
	 * mapping address but it is not mapped yet, but when populating
	 * early_pg_dir, we need the physical address and when populating
	 * swapper_pg_dir, we need the kernel virtual address so use
	 * pt_ops facility.
	 * Note that this test is then completely equivalent to
	 * p4dp = p4d_offset(pgdp, vaddr)
	 */
	if (!pgtable_l5_enabled) {
		p4dp = (p4d_t *)pgdp;
	} else {
		base_p4d = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgdp)));
		p4dp = base_p4d + p4d_index(vaddr);
	}

	do {
		next = p4d_addr_end(vaddr, end);

		if (p4d_none(*p4dp) && IS_ALIGNED(vaddr, P4D_SIZE) &&
		    (next - vaddr) >= P4D_SIZE) {
			phys_addr = __pa((uintptr_t)kasan_early_shadow_pud);
			set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_TABLE));
			continue;
		}

		kasan_early_populate_pud(p4dp, vaddr, next);
	} while (p4dp++, vaddr = next, vaddr != end);
}

static void __init kasan_early_populate_pgd(pgd_t *pgdp,
					    unsigned long vaddr,
					    unsigned long end)
{
	phys_addr_t phys_addr;
	unsigned long next;

	do {
		next = pgd_addr_end(vaddr, end);

		if (pgd_none(*pgdp) && IS_ALIGNED(vaddr, PGDIR_SIZE) &&
		    (next - vaddr) >= PGDIR_SIZE) {
			phys_addr = __pa((uintptr_t)kasan_early_shadow_p4d);
			set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_TABLE));
			continue;
		}

		kasan_early_populate_p4d(pgdp, vaddr, next);
	} while (pgdp++, vaddr = next, vaddr != end);
}

asmlinkage void __init kasan_early_init(void)
{
	uintptr_t i;

	BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
		KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));

	for (i = 0; i < PTRS_PER_PTE; ++i)
		set_pte(kasan_early_shadow_pte + i,
			pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL));

	for (i = 0; i < PTRS_PER_PMD; ++i)
		set_pmd(kasan_early_shadow_pmd + i,
			pfn_pmd(PFN_DOWN
				(__pa((uintptr_t)kasan_early_shadow_pte)),
				PAGE_TABLE));

	if (pgtable_l4_enabled) {
		for (i = 0; i < PTRS_PER_PUD; ++i)
			set_pud(kasan_early_shadow_pud + i,
				pfn_pud(PFN_DOWN
					(__pa(((uintptr_t)kasan_early_shadow_pmd))),
					PAGE_TABLE));
	}

	if (pgtable_l5_enabled) {
		for (i = 0; i < PTRS_PER_P4D; ++i)
			set_p4d(kasan_early_shadow_p4d + i,
				pfn_p4d(PFN_DOWN
					(__pa(((uintptr_t)kasan_early_shadow_pud))),
					PAGE_TABLE));
	}

	kasan_early_populate_pgd(early_pg_dir + pgd_index(KASAN_SHADOW_START),
				 KASAN_SHADOW_START, KASAN_SHADOW_END);

	local_flush_tlb_all();
}

void __init kasan_swapper_init(void)
{
	kasan_early_populate_pgd(pgd_offset_k(KASAN_SHADOW_START),
				 KASAN_SHADOW_START, KASAN_SHADOW_END);

	local_flush_tlb_all();
}

static void __init kasan_populate(void *start, void *end)
{
	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
	unsigned long vend = PAGE_ALIGN((unsigned long)end);

	kasan_populate_pgd(pgd_offset_k(vaddr), vaddr, vend);
}

static void __init kasan_shallow_populate_pud(p4d_t *p4d,
					      unsigned long vaddr, unsigned long end)
{
	unsigned long next;
	void *p;
	pud_t *pud_k = pud_offset(p4d, vaddr);

	do {
		next = pud_addr_end(vaddr, end);

		if (pud_none(*pud_k)) {
			p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
			set_pud(pud_k, pfn_pud(PFN_DOWN(__pa(p)), PAGE_TABLE));
			continue;
		}

		BUG();
	} while (pud_k++, vaddr = next, vaddr != end);
}

static void __init kasan_shallow_populate_p4d(pgd_t *pgd,
					      unsigned long vaddr, unsigned long end)
{
	unsigned long next;
	void *p;
	p4d_t *p4d_k = p4d_offset(pgd, vaddr);

	do {
		next = p4d_addr_end(vaddr, end);

		if (p4d_none(*p4d_k)) {
			p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
			set_p4d(p4d_k, pfn_p4d(PFN_DOWN(__pa(p)), PAGE_TABLE));
			continue;
		}

		kasan_shallow_populate_pud(p4d_k, vaddr, end);
	} while (p4d_k++, vaddr = next, vaddr != end);
}

static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
{
	unsigned long next;
	void *p;
	pgd_t *pgd_k = pgd_offset_k(vaddr);

	do {
		next = pgd_addr_end(vaddr, end);

		if (pgd_none(*pgd_k)) {
			p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
			set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
			continue;
		}

		kasan_shallow_populate_p4d(pgd_k, vaddr, next);
	} while (pgd_k++, vaddr = next, vaddr != end);
}

static void __init kasan_shallow_populate(void *start, void *end)
{
	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
	unsigned long vend = PAGE_ALIGN((unsigned long)end);

	kasan_shallow_populate_pgd(vaddr, vend);
}

static void __init create_tmp_mapping(void)
{
	void *ptr;
	p4d_t *base_p4d;

	/*
	 * We need to clean the early mapping: this is hard to achieve "in-place",
	 * so install a temporary mapping like arm64 and x86 do.
	 */
	memcpy(tmp_pg_dir, swapper_pg_dir, sizeof(pgd_t) * PTRS_PER_PGD);

	/* Copy the last p4d since it is shared with the kernel mapping. */
	if (pgtable_l5_enabled) {
		ptr = (p4d_t *)pgd_page_vaddr(*pgd_offset_k(KASAN_SHADOW_END));
		memcpy(tmp_p4d, ptr, sizeof(p4d_t) * PTRS_PER_P4D);
		set_pgd(&tmp_pg_dir[pgd_index(KASAN_SHADOW_END)],
			pfn_pgd(PFN_DOWN(__pa(tmp_p4d)), PAGE_TABLE));
		base_p4d = tmp_p4d;
	} else {
		base_p4d = (p4d_t *)tmp_pg_dir;
	}

	/* Copy the last pud since it is shared with the kernel mapping. */
	if (pgtable_l4_enabled) {
		ptr = (pud_t *)p4d_page_vaddr(*(base_p4d + p4d_index(KASAN_SHADOW_END)));
		memcpy(tmp_pud, ptr, sizeof(pud_t) * PTRS_PER_PUD);
		set_p4d(&base_p4d[p4d_index(KASAN_SHADOW_END)],
			pfn_p4d(PFN_DOWN(__pa(tmp_pud)), PAGE_TABLE));
	}
}

void __init kasan_init(void)
{
	phys_addr_t p_start, p_end;
	u64 i;

	create_tmp_mapping();
	csr_write(CSR_SATP, PFN_DOWN(__pa(tmp_pg_dir)) | satp_mode);

	kasan_early_clear_pgd(pgd_offset_k(KASAN_SHADOW_START),
			      KASAN_SHADOW_START, KASAN_SHADOW_END);

	kasan_populate_early_shadow((void *)kasan_mem_to_shadow((void *)FIXADDR_START),
				    (void *)kasan_mem_to_shadow((void *)VMALLOC_START));

	if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
		kasan_shallow_populate(
			(void *)kasan_mem_to_shadow((void *)VMALLOC_START),
			(void *)kasan_mem_to_shadow((void *)VMALLOC_END));
		/* Shallow populate modules and BPF which are vmalloc-allocated */
		kasan_shallow_populate(
			(void *)kasan_mem_to_shadow((void *)MODULES_VADDR),
			(void *)kasan_mem_to_shadow((void *)MODULES_END));
	} else {
		kasan_populate_early_shadow((void *)kasan_mem_to_shadow((void *)VMALLOC_START),
					    (void *)kasan_mem_to_shadow((void *)VMALLOC_END));
	}

	/* Populate the linear mapping */
	for_each_mem_range(i, &p_start, &p_end) {
		void *start = (void *)__va(p_start);
		void *end = (void *)__va(p_end);

		if (start >= end)
			break;

		kasan_populate(kasan_mem_to_shadow(start), kasan_mem_to_shadow(end));
	}

	/* Populate kernel */
	kasan_populate(kasan_mem_to_shadow((const void *)MODULES_END),
		       kasan_mem_to_shadow((const void *)MODULES_VADDR + SZ_2G));

	for (i = 0; i < PTRS_PER_PTE; i++)
		set_pte(&kasan_early_shadow_pte[i],
			mk_pte(virt_to_page(kasan_early_shadow_page),
			       __pgprot(_PAGE_PRESENT | _PAGE_READ |
					_PAGE_ACCESSED)));

	memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE);
	init_task.kasan_depth = 0;

	csr_write(CSR_SATP, PFN_DOWN(__pa(swapper_pg_dir)) | satp_mode);
	local_flush_tlb_all();
}
Commit	Line	Data
8ad8b727 NH	1	// SPDX-License-Identifier: GPL-2.0
	2	// Copyright (C) 2019 Andes Technology Corporation
	3
	4	#include <linux/pfn.h>
	5	#include <linux/init_task.h>
	6	#include <linux/kasan.h>
	7	#include <linux/kernel.h>
	8	#include <linux/memblock.h>
ca5999fd	9	#include <linux/pgtable.h>
65fddcfc	10	#include <asm/tlbflush.h>
8ad8b727	11	#include <asm/fixmap.h>
e178d670 NC	12	#include <asm/pgalloc.h>
e178d670 NC	13
e8a62cc2 AG	14	/*
	15	* Kasan shadow region must lie at a fixed address across sv39, sv48 and sv57
	16	* which is right before the kernel.
	17	*
	18	* For sv39, the region is aligned on PGDIR_SIZE so we only need to populate
	19	* the page global directory with kasan_early_shadow_pmd.
	20	*
96f9d4da AG	21	* For sv48 and sv57, the region start is aligned on PGDIR_SIZE whereas the end
96f9d4da AG	22	* region is not and then we have to go down to the PUD level.
e8a62cc2	23	*/
8ad8b727	24
dd7664d6 AG	25	static pgd_t tmp_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
	26	static p4d_t tmp_p4d[PTRS_PER_P4D] __page_aligned_bss;
	27	static pud_t tmp_pud[PTRS_PER_PUD] __page_aligned_bss;
8ad8b727	28
1987501b	29	static void __init kasan_populate_pte(pmd_t *pmd, unsigned long vaddr, unsigned long end)
d127c19c AG	30	{
d127c19c AG	31	phys_addr_t phys_addr;
96f9d4da	32	pte_t ptep, p;
d127c19c	33
96f9d4da AG	34	if (pmd_none(*pmd)) {
	35	p = memblock_alloc(PTRS_PER_PTE * sizeof(pte_t), PAGE_SIZE);
	36	set_pmd(pmd, pfn_pmd(PFN_DOWN(__pa(p)), PAGE_TABLE));
	37	}
d127c19c	38
96f9d4da	39	ptep = pte_offset_kernel(pmd, vaddr);
d127c19c AG	40
	41	do {
	42	if (pte_none(*ptep)) {
	43	phys_addr = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
	44	set_pte(ptep, pfn_pte(PFN_DOWN(phys_addr), PAGE_KERNEL));
96f9d4da	45	memset(__va(phys_addr), KASAN_SHADOW_INIT, PAGE_SIZE);
d127c19c AG	46	}
d127c19c AG	47	} while (ptep++, vaddr += PAGE_SIZE, vaddr != end);
d127c19c AG	48	}
d127c19c AG	49
e8a62cc2	50	static void __init kasan_populate_pmd(pud_t *pud, unsigned long vaddr, unsigned long end)
d127c19c AG	51	{
d127c19c AG	52	phys_addr_t phys_addr;
96f9d4da	53	pmd_t pmdp, p;
d127c19c AG	54	unsigned long next;
d127c19c AG	55
e8a62cc2	56	if (pud_none(*pud)) {
96f9d4da AG	57	p = memblock_alloc(PTRS_PER_PMD * sizeof(pmd_t), PAGE_SIZE);
96f9d4da AG	58	set_pud(pud, pfn_pud(PFN_DOWN(__pa(p)), PAGE_TABLE));
e8a62cc2	59	}
d127c19c	60
96f9d4da	61	pmdp = pmd_offset(pud, vaddr);
d127c19c AG	62
	63	do {
	64	next = pmd_addr_end(vaddr, end);
d7fbcf40 AG	65
	66	if (pmd_none(*pmdp) && IS_ALIGNED(vaddr, PMD_SIZE) && (next - vaddr) >= PMD_SIZE) {
	67	phys_addr = memblock_phys_alloc(PMD_SIZE, PMD_SIZE);
	68	if (phys_addr) {
	69	set_pmd(pmdp, pfn_pmd(PFN_DOWN(phys_addr), PAGE_KERNEL));
96f9d4da	70	memset(__va(phys_addr), KASAN_SHADOW_INIT, PMD_SIZE);
d7fbcf40 AG	71	continue;
	72	}
	73	}
	74
d127c19c AG	75	kasan_populate_pte(pmdp, vaddr, next);
d127c19c AG	76	} while (pmdp++, vaddr = next, vaddr != end);
e8a62cc2 AG	77	}
e8a62cc2 AG	78
96f9d4da	79	static void __init kasan_populate_pud(p4d_t *p4d,
cd0334e1	80	unsigned long vaddr, unsigned long end)
e8a62cc2 AG	81	{
e8a62cc2 AG	82	phys_addr_t phys_addr;
96f9d4da	83	pud_t pudp, p;
e8a62cc2 AG	84	unsigned long next;
e8a62cc2 AG	85
96f9d4da AG	86	if (p4d_none(*p4d)) {
	87	p = memblock_alloc(PTRS_PER_PUD * sizeof(pud_t), PAGE_SIZE);
	88	set_p4d(p4d, pfn_p4d(PFN_DOWN(__pa(p)), PAGE_TABLE));
e8a62cc2 AG	89	}
e8a62cc2 AG	90
96f9d4da	91	pudp = pud_offset(p4d, vaddr);
e8a62cc2 AG	92
	93	do {
	94	next = pud_addr_end(vaddr, end);
	95
	96	if (pud_none(*pudp) && IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE) {
cd0334e1 AG	97	phys_addr = memblock_phys_alloc(PUD_SIZE, PUD_SIZE);
	98	if (phys_addr) {
	99	set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_KERNEL));
96f9d4da	100	memset(__va(phys_addr), KASAN_SHADOW_INIT, PUD_SIZE);
e8a62cc2	101	continue;
e8a62cc2 AG	102	}
	103	}
	104
	105	kasan_populate_pmd(pudp, vaddr, next);
	106	} while (pudp++, vaddr = next, vaddr != end);
d127c19c AG	107	}
d127c19c AG	108
8fbdccd2	109	static void __init kasan_populate_p4d(pgd_t *pgd,
cd0334e1	110	unsigned long vaddr, unsigned long end)
8fbdccd2 QP	111	{
8fbdccd2 QP	112	phys_addr_t phys_addr;
96f9d4da	113	p4d_t p4dp, p;
8fbdccd2 QP	114	unsigned long next;
8fbdccd2 QP	115
96f9d4da AG	116	if (pgd_none(*pgd)) {
	117	p = memblock_alloc(PTRS_PER_P4D * sizeof(p4d_t), PAGE_SIZE);
	118	set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
8fbdccd2 QP	119	}
8fbdccd2 QP	120
96f9d4da	121	p4dp = p4d_offset(pgd, vaddr);
8fbdccd2 QP	122
	123	do {
	124	next = p4d_addr_end(vaddr, end);
	125
	126	if (p4d_none(*p4dp) && IS_ALIGNED(vaddr, P4D_SIZE) && (next - vaddr) >= P4D_SIZE) {
cd0334e1 AG	127	phys_addr = memblock_phys_alloc(P4D_SIZE, P4D_SIZE);
	128	if (phys_addr) {
	129	set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_KERNEL));
96f9d4da	130	memset(__va(phys_addr), KASAN_SHADOW_INIT, P4D_SIZE);
8fbdccd2	131	continue;
8fbdccd2 QP	132	}
	133	}
	134
96f9d4da	135	kasan_populate_pud(p4dp, vaddr, next);
8fbdccd2	136	} while (p4dp++, vaddr = next, vaddr != end);
8fbdccd2 QP	137	}
8fbdccd2 QP	138
2efad17e	139	static void __init kasan_populate_pgd(pgd_t *pgdp,
cd0334e1	140	unsigned long vaddr, unsigned long end)
d127c19c AG	141	{
d127c19c AG	142	phys_addr_t phys_addr;
d127c19c AG	143	unsigned long next;
	144
	145	do {
	146	next = pgd_addr_end(vaddr, end);
d7fbcf40	147
96f9d4da AG	148	if (pgd_none(*pgdp) && IS_ALIGNED(vaddr, PGDIR_SIZE) &&
	149	(next - vaddr) >= PGDIR_SIZE) {
	150	phys_addr = memblock_phys_alloc(PGDIR_SIZE, PGDIR_SIZE);
	151	if (phys_addr) {
	152	set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_KERNEL));
	153	memset(__va(phys_addr), KASAN_SHADOW_INIT, PGDIR_SIZE);
	154	continue;
d7fbcf40 AG	155	}
	156	}
	157
96f9d4da AG	158	kasan_populate_p4d(pgdp, vaddr, next);
	159	} while (pgdp++, vaddr = next, vaddr != end);
	160	}
	161
	162	static void __init kasan_early_clear_pud(p4d_t *p4dp,
	163	unsigned long vaddr, unsigned long end)
	164	{
	165	pud_t pudp, base_pud;
	166	unsigned long next;
	167
	168	if (!pgtable_l4_enabled) {
	169	pudp = (pud_t *)p4dp;
	170	} else {
	171	base_pud = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(*p4dp)));
	172	pudp = base_pud + pud_index(vaddr);
	173	}
	174
	175	do {
	176	next = pud_addr_end(vaddr, end);
	177
	178	if (IS_ALIGNED(vaddr, PUD_SIZE) && (next - vaddr) >= PUD_SIZE) {
	179	pud_clear(pudp);
	180	continue;
	181	}
	182
	183	BUG();
	184	} while (pudp++, vaddr = next, vaddr != end);
	185	}
	186
	187	static void __init kasan_early_clear_p4d(pgd_t *pgdp,
	188	unsigned long vaddr, unsigned long end)
	189	{
	190	p4d_t p4dp, base_p4d;
	191	unsigned long next;
	192
	193	if (!pgtable_l5_enabled) {
	194	p4dp = (p4d_t *)pgdp;
	195	} else {
	196	base_p4d = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgdp)));
	197	p4dp = base_p4d + p4d_index(vaddr);
	198	}
	199
	200	do {
	201	next = p4d_addr_end(vaddr, end);
	202
	203	if (pgtable_l4_enabled && IS_ALIGNED(vaddr, P4D_SIZE) &&
	204	(next - vaddr) >= P4D_SIZE) {
	205	p4d_clear(p4dp);
	206	continue;
	207	}
	208
	209	kasan_early_clear_pud(p4dp, vaddr, next);
	210	} while (p4dp++, vaddr = next, vaddr != end);
	211	}
	212
	213	static void __init kasan_early_clear_pgd(pgd_t *pgdp,
	214	unsigned long vaddr, unsigned long end)
	215	{
	216	unsigned long next;
	217
	218	do {
	219	next = pgd_addr_end(vaddr, end);
	220
	221	if (pgtable_l5_enabled && IS_ALIGNED(vaddr, PGDIR_SIZE) &&
222	(next - vaddr) >= PGDIR_SIZE) {
223	pgd_clear(pgdp);
224	continue;
225	}
226
227	kasan_early_clear_p4d(pgdp, vaddr, next);
cd0334e1 AG	228	} while (pgdp++, vaddr = next, vaddr != end);
	229	}
	230
	231	static void __init kasan_early_populate_pud(p4d_t *p4dp,
	232	unsigned long vaddr,
	233	unsigned long end)
	234	{
	235	pud_t pudp, base_pud;
	236	phys_addr_t phys_addr;
	237	unsigned long next;
	238
	239	if (!pgtable_l4_enabled) {
	240	pudp = (pud_t *)p4dp;
	241	} else {
	242	base_pud = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(*p4dp)));
	243	pudp = base_pud + pud_index(vaddr);
	244	}
	245
	246	do {
	247	next = pud_addr_end(vaddr, end);
	248
	249	if (pud_none(*pudp) && IS_ALIGNED(vaddr, PUD_SIZE) &&
	250	(next - vaddr) >= PUD_SIZE) {
	251	phys_addr = __pa((uintptr_t)kasan_early_shadow_pmd);
	252	set_pud(pudp, pfn_pud(PFN_DOWN(phys_addr), PAGE_TABLE));
	253	continue;
	254	}
	255
	256	BUG();
	257	} while (pudp++, vaddr = next, vaddr != end);
	258	}
	259
	260	static void __init kasan_early_populate_p4d(pgd_t *pgdp,
	261	unsigned long vaddr,
	262	unsigned long end)
	263	{
	264	p4d_t p4dp, base_p4d;
	265	phys_addr_t phys_addr;
	266	unsigned long next;
	267
	268	/*
	269	* We can't use pgd_page_vaddr here as it would return a linear
	270	* mapping address but it is not mapped yet, but when populating
	271	* early_pg_dir, we need the physical address and when populating
	272	* swapper_pg_dir, we need the kernel virtual address so use
	273	* pt_ops facility.
	274	* Note that this test is then completely equivalent to
	275	* p4dp = p4d_offset(pgdp, vaddr)
	276	*/
	277	if (!pgtable_l5_enabled) {
	278	p4dp = (p4d_t *)pgdp;
	279	} else {
	280	base_p4d = pt_ops.get_p4d_virt(pfn_to_phys(_pgd_pfn(*pgdp)));
	281	p4dp = base_p4d + p4d_index(vaddr);
	282	}
	283
	284	do {
	285	next = p4d_addr_end(vaddr, end);
	286
	287	if (p4d_none(*p4dp) && IS_ALIGNED(vaddr, P4D_SIZE) &&
	288	(next - vaddr) >= P4D_SIZE) {
	289	phys_addr = __pa((uintptr_t)kasan_early_shadow_pud);
	290	set_p4d(p4dp, pfn_p4d(PFN_DOWN(phys_addr), PAGE_TABLE));
	291	continue;
292	}
293
294	kasan_early_populate_pud(p4dp, vaddr, next);
295	} while (p4dp++, vaddr = next, vaddr != end);
296	}
297
298	static void __init kasan_early_populate_pgd(pgd_t *pgdp,
299	unsigned long vaddr,
300	unsigned long end)
301	{
302	phys_addr_t phys_addr;
303	unsigned long next;
304
305	do {
306	next = pgd_addr_end(vaddr, end);
307
308	if (pgd_none(*pgdp) && IS_ALIGNED(vaddr, PGDIR_SIZE) &&
309	(next - vaddr) >= PGDIR_SIZE) {
310	phys_addr = __pa((uintptr_t)kasan_early_shadow_p4d);
311	set_pgd(pgdp, pfn_pgd(PFN_DOWN(phys_addr), PAGE_TABLE));
312	continue;
313	}
314
315	kasan_early_populate_p4d(pgdp, vaddr, next);
d127c19c AG	316	} while (pgdp++, vaddr = next, vaddr != end);
	317	}
	318
2efad17e AG	319	asmlinkage void __init kasan_early_init(void)
	320	{
	321	uintptr_t i;
	322
	323	BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
	324	KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));
	325
	326	for (i = 0; i < PTRS_PER_PTE; ++i)
	327	set_pte(kasan_early_shadow_pte + i,
a3d32803	328	pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL));
2efad17e AG	329
	330	for (i = 0; i < PTRS_PER_PMD; ++i)
	331	set_pmd(kasan_early_shadow_pmd + i,
	332	pfn_pmd(PFN_DOWN
	333	(__pa((uintptr_t)kasan_early_shadow_pte)),
	334	PAGE_TABLE));
	335
	336	if (pgtable_l4_enabled) {
	337	for (i = 0; i < PTRS_PER_PUD; ++i)
	338	set_pud(kasan_early_shadow_pud + i,
	339	pfn_pud(PFN_DOWN
	340	(__pa(((uintptr_t)kasan_early_shadow_pmd))),
	341	PAGE_TABLE));
	342	}
	343
8fbdccd2 QP	344	if (pgtable_l5_enabled) {
	345	for (i = 0; i < PTRS_PER_P4D; ++i)
	346	set_p4d(kasan_early_shadow_p4d + i,
	347	pfn_p4d(PFN_DOWN
	348	(__pa(((uintptr_t)kasan_early_shadow_pud))),
	349	PAGE_TABLE));
	350	}
	351
cd0334e1 AG	352	kasan_early_populate_pgd(early_pg_dir + pgd_index(KASAN_SHADOW_START),
cd0334e1 AG	353	KASAN_SHADOW_START, KASAN_SHADOW_END);
2efad17e AG	354
	355	local_flush_tlb_all();
	356	}
	357
	358	void __init kasan_swapper_init(void)
	359	{
cd0334e1 AG	360	kasan_early_populate_pgd(pgd_offset_k(KASAN_SHADOW_START),
cd0334e1 AG	361	KASAN_SHADOW_START, KASAN_SHADOW_END);
2efad17e AG	362
	363	local_flush_tlb_all();
	364	}
	365
d127c19c	366	static void __init kasan_populate(void start, void end)
8ad8b727	367	{
8ad8b727 NH	368	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
8ad8b727 NH	369	unsigned long vend = PAGE_ALIGN((unsigned long)end);
8ad8b727	370
cd0334e1	371	kasan_populate_pgd(pgd_offset_k(vaddr), vaddr, vend);
8fbdccd2 QP	372	}
8fbdccd2 QP	373
96f9d4da	374	static void __init kasan_shallow_populate_pud(p4d_t *p4d,
8fbdccd2	375	unsigned long vaddr, unsigned long end)
e8a62cc2 AG	376	{
e8a62cc2 AG	377	unsigned long next;
96f9d4da AG	378	void *p;
96f9d4da AG	379	pud_t *pud_k = pud_offset(p4d, vaddr);
e8a62cc2	380
e8a62cc2 AG	381	do {
e8a62cc2 AG	382	next = pud_addr_end(vaddr, end);
e8a62cc2	383
96f9d4da AG	384	if (pud_none(*pud_k)) {
	385	p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
	386	set_pud(pud_k, pfn_pud(PFN_DOWN(__pa(p)), PAGE_TABLE));
8fbdccd2	387	continue;
96f9d4da	388	}
8fbdccd2	389
96f9d4da AG	390	BUG();
96f9d4da AG	391	} while (pud_k++, vaddr = next, vaddr != end);
e8a62cc2 AG	392	}
e8a62cc2 AG	393
96f9d4da	394	static void __init kasan_shallow_populate_p4d(pgd_t *pgd,
8fbdccd2 QP	395	unsigned long vaddr, unsigned long end)
	396	{
	397	unsigned long next;
96f9d4da AG	398	void *p;
96f9d4da AG	399	p4d_t *p4d_k = p4d_offset(pgd, vaddr);
8fbdccd2 QP	400
	401	do {
	402	next = p4d_addr_end(vaddr, end);
8fbdccd2	403
96f9d4da AG	404	if (p4d_none(*p4d_k)) {
	405	p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
	406	set_p4d(p4d_k, pfn_p4d(PFN_DOWN(__pa(p)), PAGE_TABLE));
8fbdccd2	407	continue;
96f9d4da	408	}
8fbdccd2	409
96f9d4da AG	410	kasan_shallow_populate_pud(p4d_k, vaddr, end);
96f9d4da AG	411	} while (p4d_k++, vaddr = next, vaddr != end);
8fbdccd2 QP	412	}
8fbdccd2 QP	413
2da073c1	414	static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
e178d670	415	{
2da073c1	416	unsigned long next;
e178d670	417	void *p;
2da073c1 AG	418	pgd_t *pgd_k = pgd_offset_k(vaddr);
	419
	420	do {
	421	next = pgd_addr_end(vaddr, end);
e8a62cc2	422
96f9d4da	423	if (pgd_none(*pgd_k)) {
2da073c1 AG	424	p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
2da073c1 AG	425	set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
e8a62cc2	426	continue;
96f9d4da	427	}
e8a62cc2	428
96f9d4da	429	kasan_shallow_populate_p4d(pgd_k, vaddr, next);
2da073c1 AG	430	} while (pgd_k++, vaddr = next, vaddr != end);
	431	}
	432
78947bdf	433	static void __init kasan_shallow_populate(void start, void end)
e178d670 NC	434	{
	435	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
	436	unsigned long vend = PAGE_ALIGN((unsigned long)end);
f3773dd0	437
2da073c1	438	kasan_shallow_populate_pgd(vaddr, vend);
96f9d4da AG	439	}
96f9d4da AG	440
9bdd9248	441	static void __init create_tmp_mapping(void)
96f9d4da AG	442	{
	443	void *ptr;
	444	p4d_t *base_p4d;
	445
	446	/*
	447	* We need to clean the early mapping: this is hard to achieve "in-place",
	448	* so install a temporary mapping like arm64 and x86 do.
	449	*/
	450	memcpy(tmp_pg_dir, swapper_pg_dir, sizeof(pgd_t) * PTRS_PER_PGD);
	451
	452	/* Copy the last p4d since it is shared with the kernel mapping. */
	453	if (pgtable_l5_enabled) {
	454	ptr = (p4d_t )pgd_page_vaddr(pgd_offset_k(KASAN_SHADOW_END));
	455	memcpy(tmp_p4d, ptr, sizeof(p4d_t) * PTRS_PER_P4D);
	456	set_pgd(&tmp_pg_dir[pgd_index(KASAN_SHADOW_END)],
	457	pfn_pgd(PFN_DOWN(__pa(tmp_p4d)), PAGE_TABLE));
	458	base_p4d = tmp_p4d;
	459	} else {
	460	base_p4d = (p4d_t *)tmp_pg_dir;
	461	}
	462
	463	/* Copy the last pud since it is shared with the kernel mapping. */
	464	if (pgtable_l4_enabled) {
	465	ptr = (pud_t )p4d_page_vaddr((base_p4d + p4d_index(KASAN_SHADOW_END)));
	466	memcpy(tmp_pud, ptr, sizeof(pud_t) * PTRS_PER_PUD);
	467	set_p4d(&base_p4d[p4d_index(KASAN_SHADOW_END)],
	468	pfn_p4d(PFN_DOWN(__pa(tmp_pud)), PAGE_TABLE));
	469	}
8ad8b727 NH	470	}
	471
	472	void __init kasan_init(void)
	473	{
314b7817	474	phys_addr_t p_start, p_end;
b10d6bca	475	u64 i;
8ad8b727	476
96f9d4da AG	477	create_tmp_mapping();
	478	csr_write(CSR_SATP, PFN_DOWN(__pa(tmp_pg_dir)) \| satp_mode);
	479
	480	kasan_early_clear_pgd(pgd_offset_k(KASAN_SHADOW_START),
	481	KASAN_SHADOW_START, KASAN_SHADOW_END);
	482
	483	kasan_populate_early_shadow((void )kasan_mem_to_shadow((void )FIXADDR_START),
	484	(void )kasan_mem_to_shadow((void )VMALLOC_START));
	485
	486	if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
e178d670 NC	487	kasan_shallow_populate(
	488	(void )kasan_mem_to_shadow((void )VMALLOC_START),
	489	(void )kasan_mem_to_shadow((void )VMALLOC_END));
96f9d4da AG	490	/* Shallow populate modules and BPF which are vmalloc-allocated */
	491	kasan_shallow_populate(
	492	(void )kasan_mem_to_shadow((void )MODULES_VADDR),
	493	(void )kasan_mem_to_shadow((void )MODULES_END));
	494	} else {
	495	kasan_populate_early_shadow((void )kasan_mem_to_shadow((void )VMALLOC_START),
	496	(void )kasan_mem_to_shadow((void )VMALLOC_END));
	497	}
8ad8b727	498
2bfc6cd8	499	/* Populate the linear mapping */
314b7817 JZ	500	for_each_mem_range(i, &p_start, &p_end) {
	501	void start = (void )__va(p_start);
	502	void end = (void )__va(p_end);
8ad8b727 NH	503
	504	if (start >= end)
	505	break;
	506
d127c19c	507	kasan_populate(kasan_mem_to_shadow(start), kasan_mem_to_shadow(end));
9d8c7d92	508	}
8ad8b727	509
96f9d4da AG	510	/* Populate kernel */
96f9d4da AG	511	kasan_populate(kasan_mem_to_shadow((const void *)MODULES_END),
3a02764c	512	kasan_mem_to_shadow((const void *)MODULES_VADDR + SZ_2G));
2bfc6cd8	513
8ad8b727 NH	514	for (i = 0; i < PTRS_PER_PTE; i++)
	515	set_pte(&kasan_early_shadow_pte[i],
	516	mk_pte(virt_to_page(kasan_early_shadow_page),
8458ca14 ZL	517	__pgprot(_PAGE_PRESENT \| _PAGE_READ \|
8458ca14 ZL	518	_PAGE_ACCESSED)));
8ad8b727	519
9484e2ae	520	memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE);
8ad8b727	521	init_task.kasan_depth = 0;
96f9d4da AG	522
	523	csr_write(CSR_SATP, PFN_DOWN(__pa(swapper_pg_dir)) \| satp_mode);
	524	local_flush_tlb_all();
8ad8b727	525	}