kasan: rename source files to reflect the new naming scheme

We now have two KASAN modes: generic KASAN and tag-based KASAN.  Rename
kasan.c to generic.c to reflect that.  Also rename kasan_init.c to init.c
as it contains initialization code for both KASAN modes.

Link: http://lkml.kernel.org/r/88c6fd2a883e459e6242030497230e5fb0d44d44.1544099024.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 488 deletions

diff --git a/mm/kasan/kasan_init.c b/mm/kasan/kasan_init.c
deleted file mode 100644
index c7550eb65922..000000000000
--- a/mm/kasan/kasan_init.c
+++ /dev/null
@@ -1,488 +0,0 @@
-/*
- * This file contains some kasan initialization code.
- *
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
- * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/memblock.h>
-#include <linux/init.h>
-#include <linux/kasan.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/pfn.h>
-#include <linux/slab.h>
-
-#include <asm/page.h>
-#include <asm/pgalloc.h>
-
-#include "kasan.h"
-
-/*
- * This page serves two purposes:
- *   - It used as early shadow memory. The entire shadow region populated
- *     with this page, before we will be able to setup normal shadow memory.
- *   - Latter it reused it as zero shadow to cover large ranges of memory
- *     that allowed to access, but not handled by kasan (vmalloc/vmemmap ...).
- */
-unsigned char kasan_zero_page[PAGE_SIZE] __page_aligned_bss;
-
-#if CONFIG_PGTABLE_LEVELS > 4
-p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D] __page_aligned_bss;
-static inline bool kasan_p4d_table(pgd_t pgd)
-{
-	return pgd_page(pgd) == virt_to_page(lm_alias(kasan_zero_p4d));
-}
-#else
-static inline bool kasan_p4d_table(pgd_t pgd)
-{
-	return 0;
-}
-#endif
-#if CONFIG_PGTABLE_LEVELS > 3
-pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss;
-static inline bool kasan_pud_table(p4d_t p4d)
-{
-	return p4d_page(p4d) == virt_to_page(lm_alias(kasan_zero_pud));
-}
-#else
-static inline bool kasan_pud_table(p4d_t p4d)
-{
-	return 0;
-}
-#endif
-#if CONFIG_PGTABLE_LEVELS > 2
-pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss;
-static inline bool kasan_pmd_table(pud_t pud)
-{
-	return pud_page(pud) == virt_to_page(lm_alias(kasan_zero_pmd));
-}
-#else
-static inline bool kasan_pmd_table(pud_t pud)
-{
-	return 0;
-}
-#endif
-pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss;
-
-static inline bool kasan_pte_table(pmd_t pmd)
-{
-	return pmd_page(pmd) == virt_to_page(lm_alias(kasan_zero_pte));
-}
-
-static inline bool kasan_zero_page_entry(pte_t pte)
-{
-	return pte_page(pte) == virt_to_page(lm_alias(kasan_zero_page));
-}
-
-static __init void *early_alloc(size_t size, int node)
-{
-	return memblock_alloc_try_nid(size, size, __pa(MAX_DMA_ADDRESS),
-					MEMBLOCK_ALLOC_ACCESSIBLE, node);
-}
-
-static void __ref zero_pte_populate(pmd_t *pmd, unsigned long addr,
-				unsigned long end)
-{
-	pte_t *pte = pte_offset_kernel(pmd, addr);
-	pte_t zero_pte;
-
-	zero_pte = pfn_pte(PFN_DOWN(__pa_symbol(kasan_zero_page)), PAGE_KERNEL);
-	zero_pte = pte_wrprotect(zero_pte);
-
-	while (addr + PAGE_SIZE <= end) {
-		set_pte_at(&init_mm, addr, pte, zero_pte);
-		addr += PAGE_SIZE;
-		pte = pte_offset_kernel(pmd, addr);
-	}
-}
-
-static int __ref zero_pmd_populate(pud_t *pud, unsigned long addr,
-				unsigned long end)
-{
-	pmd_t *pmd = pmd_offset(pud, addr);
-	unsigned long next;
-
-	do {
-		next = pmd_addr_end(addr, end);
-
-		if (IS_ALIGNED(addr, PMD_SIZE) && end - addr >= PMD_SIZE) {
-			pmd_populate_kernel(&init_mm, pmd, lm_alias(kasan_zero_pte));
-			continue;
-		}
-
-		if (pmd_none(*pmd)) {
-			pte_t *p;
-
-			if (slab_is_available())
-				p = pte_alloc_one_kernel(&init_mm, addr);
-			else
-				p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
-			if (!p)
-				return -ENOMEM;
-
-			pmd_populate_kernel(&init_mm, pmd, p);
-		}
-		zero_pte_populate(pmd, addr, next);
-	} while (pmd++, addr = next, addr != end);
-
-	return 0;
-}
-
-static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr,
-				unsigned long end)
-{
-	pud_t *pud = pud_offset(p4d, addr);
-	unsigned long next;
-
-	do {
-		next = pud_addr_end(addr, end);
-		if (IS_ALIGNED(addr, PUD_SIZE) && end - addr >= PUD_SIZE) {
-			pmd_t *pmd;
-
-			pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
-			pmd = pmd_offset(pud, addr);
-			pmd_populate_kernel(&init_mm, pmd, lm_alias(kasan_zero_pte));
-			continue;
-		}
-
-		if (pud_none(*pud)) {
-			pmd_t *p;
-
-			if (slab_is_available()) {
-				p = pmd_alloc(&init_mm, pud, addr);
-				if (!p)
-					return -ENOMEM;
-			} else {
-				pud_populate(&init_mm, pud,
-					early_alloc(PAGE_SIZE, NUMA_NO_NODE));
-			}
-		}
-		zero_pmd_populate(pud, addr, next);
-	} while (pud++, addr = next, addr != end);
-
-	return 0;
-}
-
-static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr,
-				unsigned long end)
-{
-	p4d_t *p4d = p4d_offset(pgd, addr);
-	unsigned long next;
-
-	do {
-		next = p4d_addr_end(addr, end);
-		if (IS_ALIGNED(addr, P4D_SIZE) && end - addr >= P4D_SIZE) {
-			pud_t *pud;
-			pmd_t *pmd;
-
-			p4d_populate(&init_mm, p4d, lm_alias(kasan_zero_pud));
-			pud = pud_offset(p4d, addr);
-			pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
-			pmd = pmd_offset(pud, addr);
-			pmd_populate_kernel(&init_mm, pmd,
-						lm_alias(kasan_zero_pte));
-			continue;
-		}
-
-		if (p4d_none(*p4d)) {
-			pud_t *p;
-
-			if (slab_is_available()) {
-				p = pud_alloc(&init_mm, p4d, addr);
-				if (!p)
-					return -ENOMEM;
-			} else {
-				p4d_populate(&init_mm, p4d,
-					early_alloc(PAGE_SIZE, NUMA_NO_NODE));
-			}
-		}
-		zero_pud_populate(p4d, addr, next);
-	} while (p4d++, addr = next, addr != end);
-
-	return 0;
-}
-
-/**
- * kasan_populate_zero_shadow - populate shadow memory region with
- *                               kasan_zero_page
- * @shadow_start - start of the memory range to populate
- * @shadow_end   - end of the memory range to populate
- */
-int __ref kasan_populate_zero_shadow(const void *shadow_start,
-				const void *shadow_end)
-{
-	unsigned long addr = (unsigned long)shadow_start;
-	unsigned long end = (unsigned long)shadow_end;
-	pgd_t *pgd = pgd_offset_k(addr);
-	unsigned long next;
-
-	do {
-		next = pgd_addr_end(addr, end);
-
-		if (IS_ALIGNED(addr, PGDIR_SIZE) && end - addr >= PGDIR_SIZE) {
-			p4d_t *p4d;
-			pud_t *pud;
-			pmd_t *pmd;
-
-			/*
-			 * kasan_zero_pud should be populated with pmds
-			 * at this moment.
-			 * [pud,pmd]_populate*() below needed only for
-			 * 3,2 - level page tables where we don't have
-			 * puds,pmds, so pgd_populate(), pud_populate()
-			 * is noops.
-			 *
-			 * The ifndef is required to avoid build breakage.
-			 *
-			 * With 5level-fixup.h, pgd_populate() is not nop and
-			 * we reference kasan_zero_p4d. It's not defined
-			 * unless 5-level paging enabled.
-			 *
-			 * The ifndef can be dropped once all KASAN-enabled
-			 * architectures will switch to pgtable-nop4d.h.
-			 */
-#ifndef __ARCH_HAS_5LEVEL_HACK
-			pgd_populate(&init_mm, pgd, lm_alias(kasan_zero_p4d));
-#endif
-			p4d = p4d_offset(pgd, addr);
-			p4d_populate(&init_mm, p4d, lm_alias(kasan_zero_pud));
-			pud = pud_offset(p4d, addr);
-			pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
-			pmd = pmd_offset(pud, addr);
-			pmd_populate_kernel(&init_mm, pmd, lm_alias(kasan_zero_pte));
-			continue;
-		}
-
-		if (pgd_none(*pgd)) {
-			p4d_t *p;
-
-			if (slab_is_available()) {
-				p = p4d_alloc(&init_mm, pgd, addr);
-				if (!p)
-					return -ENOMEM;
-			} else {
-				pgd_populate(&init_mm, pgd,
-					early_alloc(PAGE_SIZE, NUMA_NO_NODE));
-			}
-		}
-		zero_p4d_populate(pgd, addr, next);
-	} while (pgd++, addr = next, addr != end);
-
-	return 0;
-}
-
-static void kasan_free_pte(pte_t *pte_start, pmd_t *pmd)
-{
-	pte_t *pte;
-	int i;
-
-	for (i = 0; i < PTRS_PER_PTE; i++) {
-		pte = pte_start + i;
-		if (!pte_none(*pte))
-			return;
-	}
-
-	pte_free_kernel(&init_mm, (pte_t *)page_to_virt(pmd_page(*pmd)));
-	pmd_clear(pmd);
-}
-
-static void kasan_free_pmd(pmd_t *pmd_start, pud_t *pud)
-{
-	pmd_t *pmd;
-	int i;
-
-	for (i = 0; i < PTRS_PER_PMD; i++) {
-		pmd = pmd_start + i;
-		if (!pmd_none(*pmd))
-			return;
-	}
-
-	pmd_free(&init_mm, (pmd_t *)page_to_virt(pud_page(*pud)));
-	pud_clear(pud);
-}
-
-static void kasan_free_pud(pud_t *pud_start, p4d_t *p4d)
-{
-	pud_t *pud;
-	int i;
-
-	for (i = 0; i < PTRS_PER_PUD; i++) {
-		pud = pud_start + i;
-		if (!pud_none(*pud))
-			return;
-	}
-
-	pud_free(&init_mm, (pud_t *)page_to_virt(p4d_page(*p4d)));
-	p4d_clear(p4d);
-}
-
-static void kasan_free_p4d(p4d_t *p4d_start, pgd_t *pgd)
-{
-	p4d_t *p4d;
-	int i;
-
-	for (i = 0; i < PTRS_PER_P4D; i++) {
-		p4d = p4d_start + i;
-		if (!p4d_none(*p4d))
-			return;
-	}
-
-	p4d_free(&init_mm, (p4d_t *)page_to_virt(pgd_page(*pgd)));
-	pgd_clear(pgd);
-}
-
-static void kasan_remove_pte_table(pte_t *pte, unsigned long addr,
-				unsigned long end)
-{
-	unsigned long next;
-
-	for (; addr < end; addr = next, pte++) {
-		next = (addr + PAGE_SIZE) & PAGE_MASK;
-		if (next > end)
-			next = end;
-
-		if (!pte_present(*pte))
-			continue;
-
-		if (WARN_ON(!kasan_zero_page_entry(*pte)))
-			continue;
-		pte_clear(&init_mm, addr, pte);
-	}
-}
-
-static void kasan_remove_pmd_table(pmd_t *pmd, unsigned long addr,
-				unsigned long end)
-{
-	unsigned long next;
-
-	for (; addr < end; addr = next, pmd++) {
-		pte_t *pte;
-
-		next = pmd_addr_end(addr, end);
-
-		if (!pmd_present(*pmd))
-			continue;
-
-		if (kasan_pte_table(*pmd)) {
-			if (IS_ALIGNED(addr, PMD_SIZE) &&
-			    IS_ALIGNED(next, PMD_SIZE))
-				pmd_clear(pmd);
-			continue;
-		}
-		pte = pte_offset_kernel(pmd, addr);
-		kasan_remove_pte_table(pte, addr, next);
-		kasan_free_pte(pte_offset_kernel(pmd, 0), pmd);
-	}
-}
-
-static void kasan_remove_pud_table(pud_t *pud, unsigned long addr,
-				unsigned long end)
-{
-	unsigned long next;
-
-	for (; addr < end; addr = next, pud++) {
-		pmd_t *pmd, *pmd_base;
-
-		next = pud_addr_end(addr, end);
-
-		if (!pud_present(*pud))
-			continue;
-
-		if (kasan_pmd_table(*pud)) {
-			if (IS_ALIGNED(addr, PUD_SIZE) &&
-			    IS_ALIGNED(next, PUD_SIZE))
-				pud_clear(pud);
-			continue;
-		}
-		pmd = pmd_offset(pud, addr);
-		pmd_base = pmd_offset(pud, 0);
-		kasan_remove_pmd_table(pmd, addr, next);
-		kasan_free_pmd(pmd_base, pud);
-	}
-}
-
-static void kasan_remove_p4d_table(p4d_t *p4d, unsigned long addr,
-				unsigned long end)
-{
-	unsigned long next;
-
-	for (; addr < end; addr = next, p4d++) {
-		pud_t *pud;
-
-		next = p4d_addr_end(addr, end);
-
-		if (!p4d_present(*p4d))
-			continue;
-
-		if (kasan_pud_table(*p4d)) {
-			if (IS_ALIGNED(addr, P4D_SIZE) &&
-			    IS_ALIGNED(next, P4D_SIZE))
-				p4d_clear(p4d);
-			continue;
-		}
-		pud = pud_offset(p4d, addr);
-		kasan_remove_pud_table(pud, addr, next);
-		kasan_free_pud(pud_offset(p4d, 0), p4d);
-	}
-}
-
-void kasan_remove_zero_shadow(void *start, unsigned long size)
-{
-	unsigned long addr, end, next;
-	pgd_t *pgd;
-
-	addr = (unsigned long)kasan_mem_to_shadow(start);
-	end = addr + (size >> KASAN_SHADOW_SCALE_SHIFT);
-
-	if (WARN_ON((unsigned long)start %
-			(KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)) ||
-	    WARN_ON(size % (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)))
-		return;
-
-	for (; addr < end; addr = next) {
-		p4d_t *p4d;
-
-		next = pgd_addr_end(addr, end);
-
-		pgd = pgd_offset_k(addr);
-		if (!pgd_present(*pgd))
-			continue;
-
-		if (kasan_p4d_table(*pgd)) {
-			if (IS_ALIGNED(addr, PGDIR_SIZE) &&
-			    IS_ALIGNED(next, PGDIR_SIZE))
-				pgd_clear(pgd);
-			continue;
-		}
-
-		p4d = p4d_offset(pgd, addr);
-		kasan_remove_p4d_table(p4d, addr, next);
-		kasan_free_p4d(p4d_offset(pgd, 0), pgd);
-	}
-}
-
-int kasan_add_zero_shadow(void *start, unsigned long size)
-{
-	int ret;
-	void *shadow_start, *shadow_end;
-
-	shadow_start = kasan_mem_to_shadow(start);
-	shadow_end = shadow_start + (size >> KASAN_SHADOW_SCALE_SHIFT);
-
-	if (WARN_ON((unsigned long)start %
-			(KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)) ||
-	    WARN_ON(size % (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)))
-		return -EINVAL;
-
-	ret = kasan_populate_zero_shadow(shadow_start, shadow_end);
-	if (ret)
-		kasan_remove_zero_shadow(shadow_start,
-					size >> KASAN_SHADOW_SCALE_SHIFT);
-	return ret;
-}