@@ -41,8 +41,8 @@ Support
Architectures
~~~~~~~~~~~~~
-Generic KASAN is supported on x86_64, arm, arm64, powerpc, riscv, s390, and
-xtensa, and the tag-based KASAN modes are supported only on arm64.
+Generic KASAN is supported on x86_64, arm, arm64, powerpc, riscv, s390, xtensa,
+and loongarch, and the tag-based KASAN modes are supported only on arm64.
Compilers
~~~~~~~~~
@@ -13,7 +13,7 @@
| csky: | TODO |
| hexagon: | TODO |
| ia64: | TODO |
- | loongarch: | TODO |
+ | loongarch: | ok |
| m68k: | TODO |
| microblaze: | TODO |
| mips: | TODO |
@@ -42,7 +42,7 @@ KASAN有三种模式:
体系架构
~~~~~~~~
-在x86_64、arm、arm64、powerpc、riscv、s390和xtensa上支持通用KASAN，
+在x86_64、arm、arm64、powerpc、riscv、s390、xtensa和loongarch上支持通用KASAN，
而基于标签的KASAN模式只在arm64上支持。
编译器
@@ -7,6 +7,7 @@ config LOONGARCH
select ACPI_MCFG if ACPI
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
select ARCH_BINFMT_ELF_STATE
+ select ARCH_DISABLE_KASAN_INLINE
select ARCH_ENABLE_MEMORY_HOTPLUG
select ARCH_ENABLE_MEMORY_HOTREMOVE
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
@@ -83,6 +84,7 @@ config LOONGARCH
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_MMAP_RND_BITS if MMU
select HAVE_ARCH_SECCOMP_FILTER
+ select HAVE_ARCH_KASAN if 64BIT
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ASM_MODVERSIONS
@@ -626,6 +628,11 @@ config ARCH_MMAP_RND_BITS_MIN
config ARCH_MMAP_RND_BITS_MAX
default 18
+config KASAN_SHADOW_OFFSET
+ hex
+ default 0x0
+ depends on KASAN
+
menu "Power management options"
config ARCH_SUSPEND_POSSIBLE
new file mode 100644
@@ -0,0 +1,125 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_KASAN_H
+#define __ASM_KASAN_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/linkage.h>
+#include <linux/mmzone.h>
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+
+#define __HAVE_ARCH_SHADOW_MAP
+
+#define KASAN_SHADOW_SCALE_SHIFT 3
+#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
+
+#define XRANGE_SHIFT (48)
+
+/* Valid address length */
+#define XRANGE_SHADOW_SHIFT (PGDIR_SHIFT + PAGE_SHIFT - 3)
+/* Used for taking out the valid address */
+#define XRANGE_SHADOW_MASK GENMASK_ULL(XRANGE_SHADOW_SHIFT - 1, 0)
+/* One segment whole address space size */
+#define XRANGE_SIZE (XRANGE_SHADOW_MASK + 1)
+
+/* 64-bit segment value. */
+#define XKPRANGE_UC_SEG (UNCACHE_BASE >> DMW_PABITS)
+#define XKPRANGE_CC_SEG (CACHE_BASE >> DMW_PABITS)
+#define XKVRANGE_VC_SEG (0xffff)
+
+/* Cached */
+#define XKPRANGE_CC_START CACHE_BASE
+#define XKPRANGE_CC_SIZE XRANGE_SIZE
+#define XKPRANGE_CC_KASAN_OFFSET (0)
+#define XKPRANGE_CC_SHADOW_SIZE (XKPRANGE_CC_SIZE >> KASAN_SHADOW_SCALE_SHIFT)
+#define XKPRANGE_CC_SHADOW_END (XKPRANGE_CC_KASAN_OFFSET + XKPRANGE_CC_SHADOW_SIZE)
+
+/* UnCached */
+#define XKPRANGE_UC_START UNCACHE_BASE
+#define XKPRANGE_UC_SIZE XRANGE_SIZE
+#define XKPRANGE_UC_KASAN_OFFSET XKPRANGE_CC_SHADOW_END
+#define XKPRANGE_UC_SHADOW_SIZE (XKPRANGE_UC_SIZE >> KASAN_SHADOW_SCALE_SHIFT)
+#define XKPRANGE_UC_SHADOW_END (XKPRANGE_UC_KASAN_OFFSET + XKPRANGE_UC_SHADOW_SIZE)
+
+/* VMALLOC (Cached or UnCached) */
+#define XKVRANGE_VC_START MODULES_VADDR
+#define XKVRANGE_VC_SIZE round_up(VMEMMAP_END - MODULES_VADDR + 1, PGDIR_SIZE)
+#define XKVRANGE_VC_KASAN_OFFSET XKPRANGE_UC_SHADOW_END
+#define XKVRANGE_VC_SHADOW_SIZE (XKVRANGE_VC_SIZE >> KASAN_SHADOW_SCALE_SHIFT)
+#define XKVRANGE_VC_SHADOW_END (XKVRANGE_VC_KASAN_OFFSET + XKVRANGE_VC_SHADOW_SIZE)
+
+/* Kasan shadow memory start right after vmalloc. */
+#define KASAN_SHADOW_START round_up(VMEMMAP_END, PGDIR_SIZE)
+#define KASAN_SHADOW_SIZE (XKVRANGE_VC_SHADOW_END - XKPRANGE_CC_KASAN_OFFSET)
+#define KASAN_SHADOW_END round_up(KASAN_SHADOW_START + KASAN_SHADOW_SIZE, PGDIR_SIZE)
+
+#define XKPRANGE_CC_SHADOW_OFFSET (KASAN_SHADOW_START + XKPRANGE_CC_KASAN_OFFSET)
+#define XKPRANGE_UC_SHADOW_OFFSET (KASAN_SHADOW_START + XKPRANGE_UC_KASAN_OFFSET)
+#define XKVRANGE_VC_SHADOW_OFFSET (KASAN_SHADOW_START + XKVRANGE_VC_KASAN_OFFSET)
+
+extern bool kasan_early_stage;
+extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
+
+static inline void *kasan_mem_to_shadow(const void *addr)
+{
+ if (kasan_early_stage) {
+ return (void *)(kasan_early_shadow_page);
+ } else {
+ unsigned long maddr = (unsigned long)addr;
+ unsigned long xrange = (maddr >> XRANGE_SHIFT) & 0xffff;
+ unsigned long offset = 0;
+
+ maddr &= XRANGE_SHADOW_MASK;
+ switch (xrange) {
+ case XKPRANGE_CC_SEG:
+ offset = XKPRANGE_CC_SHADOW_OFFSET;
+ break;
+ case XKPRANGE_UC_SEG:
+ offset = XKPRANGE_UC_SHADOW_OFFSET;
+ break;
+ case XKVRANGE_VC_SEG:
+ offset = XKVRANGE_VC_SHADOW_OFFSET;
+ break;
+ default:
+ WARN_ON(1);
+ return NULL;
+ }
+
+ return (void *)((maddr >> KASAN_SHADOW_SCALE_SHIFT) + offset);
+ }
+}
+
+static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
+{
+ unsigned long addr = (unsigned long)shadow_addr;
+
+ if (unlikely(addr > KASAN_SHADOW_END) ||
+ unlikely(addr < KASAN_SHADOW_START)) {
+ WARN_ON(1);
+ return NULL;
+ }
+
+ if (addr >= XKVRANGE_VC_SHADOW_OFFSET)
+ return (void *)(((addr - XKVRANGE_VC_SHADOW_OFFSET) << KASAN_SHADOW_SCALE_SHIFT) + XKVRANGE_VC_START);
+ else if (addr >= XKPRANGE_UC_SHADOW_OFFSET)
+ return (void *)(((addr - XKPRANGE_UC_SHADOW_OFFSET) << KASAN_SHADOW_SCALE_SHIFT) + XKPRANGE_UC_START);
+ else if (addr >= XKPRANGE_CC_SHADOW_OFFSET)
+ return (void *)(((addr - XKPRANGE_CC_SHADOW_OFFSET) << KASAN_SHADOW_SCALE_SHIFT) + XKPRANGE_CC_START);
+ else {
+ WARN_ON(1);
+ return NULL;
+ }
+}
+
+#ifdef CONFIG_KASAN
+void kasan_init(void);
+asmlinkage void kasan_early_init(void);
+#else
+static inline void kasan_early_init(void) { }
+static inline void kasan_init(void) { }
+#endif
+
+#endif
+#endif
@@ -86,9 +86,16 @@ extern unsigned long zero_page_mask;
#define MODULES_END (MODULES_VADDR + SZ_256M)
#define VMALLOC_START MODULES_END
+
+#ifndef CONFIG_KASAN
#define VMALLOC_END \
(vm_map_base + \
min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits)) - PMD_SIZE - VMEMMAP_SIZE)
+#else
+#define VMALLOC_END \
+ (vm_map_base + \
+ min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, (1UL << cpu_vabits) / 2) - PMD_SIZE - VMEMMAP_SIZE)
+#endif
#define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK))
#define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1)
@@ -7,11 +7,27 @@
#define __HAVE_ARCH_MEMSET
extern void *memset(void *__s, int __c, size_t __count);
+extern void *__memset(void *__s, int __c, size_t __count);
#define __HAVE_ARCH_MEMCPY
extern void *memcpy(void *__to, __const__ void *__from, size_t __n);
+extern void *__memcpy(void *__to, __const__ void *__from, size_t __n);
#define __HAVE_ARCH_MEMMOVE
extern void *memmove(void *__dest, __const__ void *__src, size_t __n);
+extern void *__memmove(void *__dest, __const__ void *__src, size_t __n);
+
+#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
+
+/*
+ * For files that are not instrumented (e.g. mm/slub.c) we
+ * should use not instrumented version of mem* functions.
+ */
+
+#define memset(s, c, n) __memset(s, c, n)
+#define memcpy(dst, src, len) __memcpy(dst, src, len)
+#define memmove(dst, src, len) __memmove(dst, src, len)
+
+#endif
#endif /* _ASM_STRING_H */
@@ -30,6 +30,9 @@ ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_perf_event.o = $(CC_FLAGS_FTRACE)
endif
+KASAN_SANITIZE_vdso.o := n
+KASAN_SANITIZE_efi.o := n
+
obj-$(CONFIG_MODULES) += module.o module-sections.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
@@ -103,6 +103,10 @@ SYM_CODE_START(kernel_entry) # kernel entry point
#endif
#endif
+#ifdef CONFIG_KASAN
+ bl kasan_early_init
+#endif
+
bl start_kernel
ASM_BUG()
@@ -610,4 +610,8 @@ void __init setup_arch(char **cmdline_p)
#endif
paging_init();
+
+#if defined(CONFIG_KASAN)
+ kasan_init();
+#endif
}
@@ -10,16 +10,18 @@
#include <asm/export.h>
#include <asm/regdef.h>
-SYM_FUNC_START(memcpy)
+SYM_FUNC_START_WEAK(memcpy)
/*
* Some CPUs support hardware unaligned access
*/
ALTERNATIVE "b __memcpy_generic", \
"b __memcpy_fast", CPU_FEATURE_UAL
SYM_FUNC_END(memcpy)
+SYM_FUNC_ALIAS(__memcpy, memcpy)
_ASM_NOKPROBE(memcpy)
EXPORT_SYMBOL(memcpy)
+EXPORT_SYMBOL(__memcpy)
/*
* void *__memcpy_generic(void *dst, const void *src, size_t n)
@@ -10,7 +10,7 @@
#include <asm/export.h>
#include <asm/regdef.h>
-SYM_FUNC_START(memmove)
+SYM_FUNC_START_WEAK(memmove)
blt a0, a1, 1f /* dst < src, memcpy */
blt a1, a0, 3f /* src < dst, rmemcpy */
jr ra /* dst == src, return */
@@ -19,27 +19,30 @@ SYM_FUNC_START(memmove)
1: ori a3, zero, 64
sub.d t0, a1, a0
blt t0, a3, 2f
- b memcpy
+ b __memcpy
2: b __memcpy_generic
/* if (dst - src) < 64, copy 1 byte at a time */
3: ori a3, zero, 64
sub.d t0, a0, a1
blt t0, a3, 4f
- b rmemcpy
+ b __rmemcpy
4: b __rmemcpy_generic
SYM_FUNC_END(memmove)
+SYM_FUNC_ALIAS(__memmove, memmove)
_ASM_NOKPROBE(memmove)
EXPORT_SYMBOL(memmove)
+EXPORT_SYMBOL(__memmove)
+
+SYM_FUNC_START(__rmemcpy)
-SYM_FUNC_START(rmemcpy)
/*
* Some CPUs support hardware unaligned access
*/
ALTERNATIVE "b __rmemcpy_generic", \
"b __rmemcpy_fast", CPU_FEATURE_UAL
-SYM_FUNC_END(rmemcpy)
+SYM_FUNC_END(__rmemcpy)
_ASM_NOKPROBE(rmemcpy)
/*
@@ -16,16 +16,18 @@
bstrins.d \r0, \r0, 63, 32
.endm
-SYM_FUNC_START(memset)
+SYM_FUNC_START_WEAK(memset)
/*
* Some CPUs support hardware unaligned access
*/
ALTERNATIVE "b __memset_generic", \
"b __memset_fast", CPU_FEATURE_UAL
SYM_FUNC_END(memset)
+SYM_FUNC_ALIAS(__memset, memset)
_ASM_NOKPROBE(memset)
EXPORT_SYMBOL(memset)
+EXPORT_SYMBOL(__memset)
/*
* void *__memset_generic(void *s, int c, size_t n)
@@ -7,3 +7,5 @@ obj-y += init.o cache.o tlb.o tlbex.o extable.o \
fault.o ioremap.o maccess.o mmap.o pgtable.o page.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
+obj-$(CONFIG_KASAN) += kasan_init.o
+KASAN_SANITIZE_kasan_init.o := n
new file mode 100644
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Loongson Technology Corporation Limited
+ */
+#define pr_fmt(fmt) "kasan: " fmt
+#include <linux/kasan.h>
+#include <linux/memblock.h>
+#include <linux/sched/task.h>
+
+#include <asm/tlbflush.h>
+#include <asm/pgalloc.h>
+#include <asm-generic/sections.h>
+
+static pgd_t tmp_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
+
+static inline int __p4d_none(int early, p4d_t p4d) {return 0; }
+
+#ifndef __PAGETABLE_PUD_FOLDED
+#define __p4d_none(early, p4d) (early ? (p4d_val(p4d) == 0) : \
+(__pa(p4d_val(p4d)) == (unsigned long)__pa(kasan_early_shadow_pud)))
+#endif
+
+#define __pud_none(early, pud) (early ? (pud_val(pud) == 0) : \
+(__pa(pud_val(pud)) == (unsigned long)__pa(kasan_early_shadow_pmd)))
+
+#define __pmd_none(early, pmd) (early ? (pmd_val(pmd) == 0) : \
+(__pa(pmd_val(pmd)) == (unsigned long)__pa(kasan_early_shadow_pte)))
+
+#define __pte_none(early, pte) (early ? pte_none(pte) : \
+((pte_val(pte) & _PFN_MASK) == (unsigned long)__pa(kasan_early_shadow_page)))
+
+bool kasan_early_stage = true;
+
+/*
+ * Alloc memory for shadow memory page table.
+ */
+static phys_addr_t __init kasan_alloc_zeroed_page(int node)
+{
+ void *p = memblock_alloc_try_nid(PAGE_SIZE, PAGE_SIZE,
+ __pa(MAX_DMA_ADDRESS),
+ MEMBLOCK_ALLOC_ACCESSIBLE, node);
+ if (!p)
+ panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%llx\n",
+ __func__, PAGE_SIZE, PAGE_SIZE, node, __pa(MAX_DMA_ADDRESS));
+ return __pa(p);
+}
+
+static pte_t *kasan_pte_offset(pmd_t *pmdp, unsigned long addr, int node,
+ bool early)
+{
+ if (__pmd_none(early, READ_ONCE(*pmdp))) {
+ phys_addr_t pte_phys = early ?
+ __pa_symbol(kasan_early_shadow_pte)
+ : kasan_alloc_zeroed_page(node);
+ if (!early)
+ memcpy(__va(pte_phys), kasan_early_shadow_pte,
+ sizeof(kasan_early_shadow_pte));
+ pmd_populate_kernel(NULL, pmdp, (pte_t *)__va(pte_phys));
+ }
+
+ return pte_offset_kernel(pmdp, addr);
+}
+
+static inline void kasan_set_pgd(pgd_t *pgdp, pgd_t pgdval)
+{
+ WRITE_ONCE(*pgdp, pgdval);
+}
+
+static pmd_t *kasan_pmd_offset(pud_t *pudp, unsigned long addr, int node,
+ bool early)
+{
+ if (__pud_none(early, READ_ONCE(*pudp))) {
+ phys_addr_t pmd_phys = early ?
+ __pa_symbol(kasan_early_shadow_pmd)
+ : kasan_alloc_zeroed_page(node);
+ if (!early)
+ memcpy(__va(pmd_phys), kasan_early_shadow_pmd,
+ sizeof(kasan_early_shadow_pmd));
+ pud_populate(&init_mm, pudp, (pmd_t *)__va(pmd_phys));
+ }
+
+ return pmd_offset(pudp, addr);
+}
+
+static pud_t *__init kasan_pud_offset(p4d_t *p4dp, unsigned long addr, int node,
+ bool early)
+{
+ if (__p4d_none(early, READ_ONCE(*p4dp))) {
+ phys_addr_t pud_phys = early ?
+ __pa_symbol(kasan_early_shadow_pud)
+ : kasan_alloc_zeroed_page(node);
+ if (!early)
+ memcpy(__va(pud_phys), kasan_early_shadow_pud,
+ sizeof(kasan_early_shadow_pud));
+ p4d_populate(&init_mm, p4dp, (pud_t *)__va(pud_phys));
+ }
+
+ return pud_offset(p4dp, addr);
+}
+
+static void 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_early_shadow_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(early, READ_ONCE(*ptep)));
+}
+
+static void 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(early, READ_ONCE(*pmdp)));
+}
+
+static void __init kasan_pud_populate(p4d_t *p4dp, unsigned long addr,
+ unsigned long end, int node, bool early)
+{
+ unsigned long next;
+ pud_t *pudp = kasan_pud_offset(p4dp, addr, node, early);
+
+ do {
+ next = pud_addr_end(addr, end);
+ kasan_pmd_populate(pudp, addr, next, node, early);
+ } while (pudp++, addr = next, addr != end);
+}
+
+static void __init kasan_p4d_populate(pgd_t *pgdp, unsigned long addr,
+ unsigned long end, int node, bool early)
+{
+ unsigned long next;
+ p4d_t *p4dp = p4d_offset(pgdp, addr);
+
+ do {
+ next = p4d_addr_end(addr, end);
+ kasan_pud_populate(p4dp, addr, next, node, early);
+ } while (p4dp++, addr = next, addr != end);
+}
+
+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_p4d_populate(pgdp, addr, next, node, early);
+ } while (pgdp++, addr = next, addr != end);
+
+}
+
+asmlinkage void __init kasan_early_init(void)
+{
+ BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PGDIR_SIZE));
+ BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE));
+}
+
+/* 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);
+}
+
+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)
+ kasan_set_pgd((pgd_t *)pgd_offset_k(start), __pgd(0));
+}
+
+void __init kasan_init(void)
+{
+ u64 i;
+ phys_addr_t pa_start, pa_end;
+ /*
+ * PGD was populated as invalid_pmd_table or invalid_pud_table
+ * in pagetable_init() which depends on how many levels of page
+ * table you are using, but we had to clean the gpd of kasan
+ * shadow memory, as the pgd value is none-zero.
+ * The assertion pgd_none is going to be false and the formal populate
+ * afterwards is not going to create any new pgd at all.
+ */
+ memcpy(tmp_pg_dir, swapper_pg_dir, sizeof(tmp_pg_dir));
+ __sync();
+ csr_write64(__pa_symbol(tmp_pg_dir), LOONGARCH_CSR_PGDH);
+ local_flush_tlb_all();
+
+ clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
+
+ /* Maps everything to a single page of zeroes */
+ kasan_pgd_populate(KASAN_SHADOW_START, KASAN_SHADOW_END,
+ NUMA_NO_NODE, true);
+
+ kasan_populate_early_shadow(kasan_mem_to_shadow((void *)MODULES_END),
+ kasan_mem_to_shadow((void *)VMEMMAP_END));
+
+ if (!IS_ENABLED(CONFIG_KASAN_VMALLOC))
+ kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
+ kasan_mem_to_shadow((void *)VMALLOC_END));
+
+ kasan_early_stage = false;
+
+ /* Populate the linear mapping */
+ for_each_mem_range(i, &pa_start, &pa_end) {
+ void *start = (void *)phys_to_virt(pa_start);
+ void *end = (void *)phys_to_virt(pa_end);
+
+ if (start >= end)
+ break;
+
+ kasan_map_populate((unsigned long)kasan_mem_to_shadow(start),
+ (unsigned long)kasan_mem_to_shadow(end), NUMA_NO_NODE);
+ }
+
+ /* Populate modules mapping */
+ kasan_map_populate((unsigned long)kasan_mem_to_shadow((void *)MODULES_VADDR),
+ (unsigned long)kasan_mem_to_shadow((void *)MODULES_END), NUMA_NO_NODE);
+ /*
+ * Kasan may reuse the contents of kasan_early_shadow_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_early_shadow_pte[i],
+ pfn_pte(__phys_to_pfn(__pa_symbol(kasan_early_shadow_page)),
+ PAGE_KERNEL_RO));
+
+ memset(kasan_early_shadow_page, 0, PAGE_SIZE);
+ __sync();
+ csr_write64(__pa_symbol(swapper_pg_dir), LOONGARCH_CSR_PGDH);
+ local_flush_tlb_all();
+
+ /* At this point kasan is fully initialized. Enable error messages */
+ init_task.kasan_depth = 0;
+ pr_info("KernelAddressSanitizer initialized.\n");
+}
@@ -1,6 +1,10 @@
# SPDX-License-Identifier: GPL-2.0
# Objects to go into the VDSO.
+ifdef CONFIG_KASAN
+KASAN_SANITIZE := n
+endif
+
# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
# the inclusion of generic Makefile.
ARCH_REL_TYPE_ABS := R_LARCH_32|R_LARCH_64|R_LARCH_MARK_LA|R_LARCH_JUMP_SLOT