Release 4.17 arch/arm64/mm/kasan_init.c
/*
* This file contains kasan initialization code for ARM64.
*
* 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.
*
*/
#define pr_fmt(fmt) "kasan: " fmt
#include <linux/bootmem.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
#include <linux/sched/task.h>
#include <linux/memblock.h>
#include <linux/start_kernel.h>
#include <linux/mm.h>
#include <asm/mmu_context.h>
#include <asm/kernel-pgtable.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/tlbflush.h>
static pgd_t tmp_pg_dir[PTRS_PER_PGD] __initdata __aligned(PGD_SIZE);
/*
* The p*d_populate functions call virt_to_phys implicitly so they can't be used
* directly on kernel symbols (bm_p*d). All the early functions are called too
* early to use lm_alias so __p*d_populate functions must be used to populate
* with the physical address from __pa_symbol.
*/
static phys_addr_t __init kasan_alloc_zeroed_page(int node)
{
void *p = memblock_virt_alloc_try_nid(PAGE_SIZE, PAGE_SIZE,
__pa(MAX_DMA_ADDRESS),
MEMBLOCK_ALLOC_ACCESSIBLE, node);
return __pa(p);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 34 | 94.44% | 1 | 50.00% |
| Andrey Ryabinin | 2 | 5.56% | 1 | 50.00% |
| Total | 36 | 100.00% | 2 | 100.00% |
static pte_t *__init kasan_pte_offset(pmd_t *pmdp, unsigned long addr, int node,
bool early)
{
if (pmd_none(READ_ONCE(*pmdp))) {
phys_addr_t pte_phys = early ? __pa_symbol(kasan_zero_pte)
: kasan_alloc_zeroed_page(node);
__pmd_populate(pmdp, pte_phys, PMD_TYPE_TABLE);
}
return early ? pte_offset_kimg(pmdp, addr)
: pte_offset_kernel(pmdp, addr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 55 | 72.37% | 2 | 50.00% |
| Andrey Ryabinin | 20 | 26.32% | 1 | 25.00% |
| Laura Abbott | 1 | 1.32% | 1 | 25.00% |
| Total | 76 | 100.00% | 4 | 100.00% |
static pmd_t *__init kasan_pmd_offset(pud_t *pudp, unsigned long addr, int node,
bool early)
{
if (pud_none(READ_ONCE(*pudp))) {
phys_addr_t pmd_phys = early ? __pa_symbol(kasan_zero_pmd)
: kasan_alloc_zeroed_page(node);
__pud_populate(pudp, pmd_phys, PMD_TYPE_TABLE);
}
return early ? pmd_offset_kimg(pudp, addr) : pmd_offset(pudp, addr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 76 | 100.00% | 2 | 100.00% |
| Total | 76 | 100.00% | 2 | 100.00% |
static pud_t *__init kasan_pud_offset(pgd_t *pgdp, unsigned long addr, int node,
bool early)
{
if (pgd_none(READ_ONCE(*pgdp))) {
phys_addr_t pud_phys = early ? __pa_symbol(kasan_zero_pud)
: kasan_alloc_zeroed_page(node);
__pgd_populate(pgdp, pud_phys, PMD_TYPE_TABLE);
}
return early ? pud_offset_kimg(pgdp, addr) : pud_offset(pgdp, addr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 69 | 90.79% | 2 | 50.00% |
| Laura Abbott | 5 | 6.58% | 1 | 25.00% |
| Andrey Ryabinin | 2 | 2.63% | 1 | 25.00% |
| Total | 76 | 100.00% | 4 | 100.00% |
static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr,
unsigned long end, int node, bool early)
{
unsigned long next;
pte_t *ptep = kasan_pte_offset(pmdp, addr, node, early);
do {
phys_addr_t page_phys = early ? __pa_symbol(kasan_zero_page)
: kasan_alloc_zeroed_page(node);
next = addr + PAGE_SIZE;
set_pte(ptep, pfn_pte(__phys_to_pfn(page_phys), PAGE_KERNEL));
} while (ptep++, addr = next, addr != end && pte_none(READ_ONCE(*ptep)));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 62 | 58.49% | 2 | 66.67% |
| Andrey Ryabinin | 44 | 41.51% | 1 | 33.33% |
| Total | 106 | 100.00% | 3 | 100.00% |
static void __init kasan_pmd_populate(pud_t *pudp, unsigned long addr,
unsigned long end, int node, bool early)
{
unsigned long next;
pmd_t *pmdp = kasan_pmd_offset(pudp, addr, node, early);
do {
next = pmd_addr_end(addr, end);
kasan_pte_populate(pmdp, addr, next, node, early);
} while (pmdp++, addr = next, addr != end && pmd_none(READ_ONCE(*pmdp)));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrey Ryabinin | 62 | 67.39% | 1 | 33.33% |
| Will Deacon | 30 | 32.61% | 2 | 66.67% |
| Total | 92 | 100.00% | 3 | 100.00% |
static void __init kasan_pud_populate(pgd_t *pgdp, unsigned long addr,
unsigned long end, int node, bool early)
{
unsigned long next;
pud_t *pudp = kasan_pud_offset(pgdp, addr, node, early);
do {
next = pud_addr_end(addr, end);
kasan_pmd_populate(pudp, addr, next, node, early);
} while (pudp++, addr = next, addr != end && pud_none(READ_ONCE(*pudp)));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrey Ryabinin | 62 | 67.39% | 1 | 33.33% |
| Will Deacon | 30 | 32.61% | 2 | 66.67% |
| Total | 92 | 100.00% | 3 | 100.00% |
static void __init kasan_pgd_populate(unsigned long addr, unsigned long end,
int node, bool early)
{
unsigned long next;
pgd_t *pgdp;
pgdp = pgd_offset_k(addr);
do {
next = pgd_addr_end(addr, end);
kasan_pud_populate(pgdp, addr, next, node, early);
} while (pgdp++, addr = next, addr != end);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrey Ryabinin | 56 | 74.67% | 1 | 33.33% |
| Will Deacon | 19 | 25.33% | 2 | 66.67% |
| Total | 75 | 100.00% | 3 | 100.00% |
/* The early shadow maps everything to a single page of zeroes */
asmlinkage void __init kasan_early_init(void)
{
BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));
BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PGDIR_SIZE));
BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE));
kasan_pgd_populate(KASAN_SHADOW_START, KASAN_SHADOW_END, NUMA_NO_NODE,
true);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrey Ryabinin | 41 | 69.49% | 1 | 25.00% |
| Will Deacon | 13 | 22.03% | 2 | 50.00% |
| Andrey Konovalov | 5 | 8.47% | 1 | 25.00% |
| Total | 59 | 100.00% | 4 | 100.00% |
/* Set up full kasan mappings, ensuring that the mapped pages are zeroed */
static void __init kasan_map_populate(unsigned long start, unsigned long end,
int node)
{
kasan_pgd_populate(start & PAGE_MASK, PAGE_ALIGN(end), node, false);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 32 | 94.12% | 1 | 50.00% |
| Andrey Ryabinin | 2 | 5.88% | 1 | 50.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
/*
* Copy the current shadow region into a new pgdir.
*/
void __init kasan_copy_shadow(pgd_t *pgdir)
{
pgd_t *pgdp, *pgdp_new, *pgdp_end;
pgdp = pgd_offset_k(KASAN_SHADOW_START);
pgdp_end = pgd_offset_k(KASAN_SHADOW_END);
pgdp_new = pgd_offset_raw(pgdir, KASAN_SHADOW_START);
do {
set_pgd(pgdp_new, READ_ONCE(*pgdp));
} while (pgdp++, pgdp_new++, pgdp != pgdp_end);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mark Rutland | 55 | 78.57% | 1 | 50.00% |
| Will Deacon | 15 | 21.43% | 1 | 50.00% |
| Total | 70 | 100.00% | 2 | 100.00% |
static void __init clear_pgds(unsigned long start,
unsigned long end)
{
/*
* Remove references to kasan page tables from
* swapper_pg_dir. pgd_clear() can't be used
* here because it's nop on 2,3-level pagetable setups
*/
for (; start < end; start += PGDIR_SIZE)
set_pgd(pgd_offset_k(start), __pgd(0));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrey Ryabinin | 40 | 100.00% | 1 | 100.00% |
| Total | 40 | 100.00% | 1 | 100.00% |
void __init kasan_init(void)
{
u64 kimg_shadow_start, kimg_shadow_end;
u64 mod_shadow_start, mod_shadow_end;
struct memblock_region *reg;
int i;
kimg_shadow_start = (u64)kasan_mem_to_shadow(_text) & PAGE_MASK;
kimg_shadow_end = PAGE_ALIGN((u64)kasan_mem_to_shadow(_end));
mod_shadow_start = (u64)kasan_mem_to_shadow((void *)MODULES_VADDR);
mod_shadow_end = (u64)kasan_mem_to_shadow((void *)MODULES_END);
/*
* We are going to perform proper setup of shadow memory.
* At first we should unmap early shadow (clear_pgds() call bellow).
* However, instrumented code couldn't execute without shadow memory.
* tmp_pg_dir used to keep early shadow mapped until full shadow
* setup will be finished.
*/
memcpy(tmp_pg_dir, swapper_pg_dir, sizeof(tmp_pg_dir));
dsb(ishst);
cpu_replace_ttbr1(lm_alias(tmp_pg_dir));
clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
kasan_map_populate(kimg_shadow_start, kimg_shadow_end,
early_pfn_to_nid(virt_to_pfn(lm_alias(_text))));
kasan_populate_zero_shadow((void *)KASAN_SHADOW_START,
(void *)mod_shadow_start);
kasan_populate_zero_shadow((void *)kimg_shadow_end,
kasan_mem_to_shadow((void *)PAGE_OFFSET));
if (kimg_shadow_start > mod_shadow_end)
kasan_populate_zero_shadow((void *)mod_shadow_end,
(void *)kimg_shadow_start);
for_each_memblock(memory, reg) {
void *start = (void *)__phys_to_virt(reg->base);
void *end = (void *)__phys_to_virt(reg->base + reg->size);
if (start >= end)
break;
kasan_map_populate((unsigned long)kasan_mem_to_shadow(start),
(unsigned long)kasan_mem_to_shadow(end),
early_pfn_to_nid(virt_to_pfn(start)));
}
/*
* KAsan may reuse the contents of kasan_zero_pte directly, so we
* should make sure that it maps the zero page read-only.
*/
for (i = 0; i < PTRS_PER_PTE; i++)
set_pte(&kasan_zero_pte[i],
pfn_pte(sym_to_pfn(kasan_zero_page), PAGE_KERNEL_RO));
memset(kasan_zero_page, 0, PAGE_SIZE);
cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
/* At this point kasan is fully initialized. Enable error messages */
init_task.kasan_depth = 0;
pr_info("KernelAddressSanitizer initialized\n");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrey Ryabinin | 153 | 47.22% | 1 | 10.00% |
| Ard Biesheuvel | 140 | 43.21% | 3 | 30.00% |
| Mark Rutland | 11 | 3.40% | 3 | 30.00% |
| Laura Abbott | 7 | 2.16% | 1 | 10.00% |
| Will Deacon | 7 | 2.16% | 1 | 10.00% |
| Catalin Marinas | 6 | 1.85% | 1 | 10.00% |
| Total | 324 | 100.00% | 10 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrey Ryabinin | 528 | 43.21% | 1 | 6.67% |
| Will Deacon | 447 | 36.58% | 3 | 20.00% |
| Ard Biesheuvel | 146 | 11.95% | 3 | 20.00% |
| Mark Rutland | 70 | 5.73% | 4 | 26.67% |
| Laura Abbott | 17 | 1.39% | 1 | 6.67% |
| Catalin Marinas | 6 | 0.49% | 1 | 6.67% |
| Andrey Konovalov | 5 | 0.41% | 1 | 6.67% |
| Ingo Molnar | 3 | 0.25% | 1 | 6.67% |
| Total | 1222 | 100.00% | 15 | 100.00% |
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