192 lines
4.6 KiB
C
192 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#define DISABLE_BRANCH_PROFILING
|
|
|
|
#include <linux/kasan.h>
|
|
#include <linux/printk.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/sched/task.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/code-patching.h>
|
|
#include <mm/mmu_decl.h>
|
|
|
|
static pgprot_t __init kasan_prot_ro(void)
|
|
{
|
|
if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE))
|
|
return PAGE_READONLY;
|
|
|
|
return PAGE_KERNEL_RO;
|
|
}
|
|
|
|
static void __init kasan_populate_pte(pte_t *ptep, pgprot_t prot)
|
|
{
|
|
unsigned long va = (unsigned long)kasan_early_shadow_page;
|
|
phys_addr_t pa = __pa(kasan_early_shadow_page);
|
|
int i;
|
|
|
|
for (i = 0; i < PTRS_PER_PTE; i++, ptep++)
|
|
__set_pte_at(&init_mm, va, ptep, pfn_pte(PHYS_PFN(pa), prot), 0);
|
|
}
|
|
|
|
int __init kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end)
|
|
{
|
|
pmd_t *pmd;
|
|
unsigned long k_cur, k_next;
|
|
|
|
pmd = pmd_off_k(k_start);
|
|
|
|
for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++) {
|
|
pte_t *new;
|
|
|
|
k_next = pgd_addr_end(k_cur, k_end);
|
|
if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte)
|
|
continue;
|
|
|
|
new = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE);
|
|
|
|
if (!new)
|
|
return -ENOMEM;
|
|
kasan_populate_pte(new, PAGE_KERNEL);
|
|
pmd_populate_kernel(&init_mm, pmd, new);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int __init __weak kasan_init_region(void *start, size_t size)
|
|
{
|
|
unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
|
|
unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
|
|
unsigned long k_cur;
|
|
int ret;
|
|
void *block;
|
|
|
|
ret = kasan_init_shadow_page_tables(k_start, k_end);
|
|
if (ret)
|
|
return ret;
|
|
|
|
block = memblock_alloc(k_end - k_start, PAGE_SIZE);
|
|
if (!block)
|
|
return -ENOMEM;
|
|
|
|
for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
|
|
pmd_t *pmd = pmd_off_k(k_cur);
|
|
void *va = block + k_cur - k_start;
|
|
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
|
|
|
|
__set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
|
|
}
|
|
flush_tlb_kernel_range(k_start, k_end);
|
|
return 0;
|
|
}
|
|
|
|
void __init
|
|
kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte)
|
|
{
|
|
unsigned long k_cur;
|
|
|
|
for (k_cur = k_start; k_cur != k_end; k_cur += PAGE_SIZE) {
|
|
pmd_t *pmd = pmd_off_k(k_cur);
|
|
pte_t *ptep = pte_offset_kernel(pmd, k_cur);
|
|
|
|
if (pte_page(*ptep) != virt_to_page(lm_alias(kasan_early_shadow_page)))
|
|
continue;
|
|
|
|
__set_pte_at(&init_mm, k_cur, ptep, pte, 0);
|
|
}
|
|
|
|
flush_tlb_kernel_range(k_start, k_end);
|
|
}
|
|
|
|
static void __init kasan_remap_early_shadow_ro(void)
|
|
{
|
|
pgprot_t prot = kasan_prot_ro();
|
|
phys_addr_t pa = __pa(kasan_early_shadow_page);
|
|
|
|
kasan_populate_pte(kasan_early_shadow_pte, prot);
|
|
|
|
kasan_update_early_region(KASAN_SHADOW_START, KASAN_SHADOW_END,
|
|
pfn_pte(PHYS_PFN(pa), prot));
|
|
}
|
|
|
|
static void __init kasan_unmap_early_shadow_vmalloc(void)
|
|
{
|
|
unsigned long k_start = (unsigned long)kasan_mem_to_shadow((void *)VMALLOC_START);
|
|
unsigned long k_end = (unsigned long)kasan_mem_to_shadow((void *)VMALLOC_END);
|
|
|
|
kasan_update_early_region(k_start, k_end, __pte(0));
|
|
|
|
#ifdef MODULES_VADDR
|
|
k_start = (unsigned long)kasan_mem_to_shadow((void *)MODULES_VADDR);
|
|
k_end = (unsigned long)kasan_mem_to_shadow((void *)MODULES_END);
|
|
kasan_update_early_region(k_start, k_end, __pte(0));
|
|
#endif
|
|
}
|
|
|
|
void __init kasan_mmu_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE)) {
|
|
ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END);
|
|
|
|
if (ret)
|
|
panic("kasan: kasan_init_shadow_page_tables() failed");
|
|
}
|
|
}
|
|
|
|
void __init kasan_init(void)
|
|
{
|
|
phys_addr_t base, end;
|
|
u64 i;
|
|
int ret;
|
|
|
|
for_each_mem_range(i, &base, &end) {
|
|
phys_addr_t top = min(end, total_lowmem);
|
|
|
|
if (base >= top)
|
|
continue;
|
|
|
|
ret = kasan_init_region(__va(base), top - base);
|
|
if (ret)
|
|
panic("kasan: kasan_init_region() failed");
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
|
|
ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END);
|
|
|
|
if (ret)
|
|
panic("kasan: kasan_init_shadow_page_tables() failed");
|
|
}
|
|
|
|
kasan_remap_early_shadow_ro();
|
|
|
|
clear_page(kasan_early_shadow_page);
|
|
|
|
/* At this point kasan is fully initialized. Enable error messages */
|
|
init_task.kasan_depth = 0;
|
|
pr_info("KASAN init done\n");
|
|
}
|
|
|
|
void __init kasan_late_init(void)
|
|
{
|
|
if (IS_ENABLED(CONFIG_KASAN_VMALLOC))
|
|
kasan_unmap_early_shadow_vmalloc();
|
|
}
|
|
|
|
void __init kasan_early_init(void)
|
|
{
|
|
unsigned long addr = KASAN_SHADOW_START;
|
|
unsigned long end = KASAN_SHADOW_END;
|
|
unsigned long next;
|
|
pmd_t *pmd = pmd_off_k(addr);
|
|
|
|
BUILD_BUG_ON(KASAN_SHADOW_START & ~PGDIR_MASK);
|
|
|
|
kasan_populate_pte(kasan_early_shadow_pte, PAGE_KERNEL);
|
|
|
|
do {
|
|
next = pgd_addr_end(addr, end);
|
|
pmd_populate_kernel(&init_mm, pmd, kasan_early_shadow_pte);
|
|
} while (pmd++, addr = next, addr != end);
|
|
}
|