diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/loongarch/Kconfig | 7 | ||||
| -rw-r--r-- | arch/loongarch/Makefile | 3 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/kasan.h | 126 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/pgtable.h | 7 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/string.h | 20 | ||||
| -rw-r--r-- | arch/loongarch/kernel/Makefile | 6 | ||||
| -rw-r--r-- | arch/loongarch/kernel/head.S | 4 | ||||
| -rw-r--r-- | arch/loongarch/kernel/setup.c | 4 | ||||
| -rw-r--r-- | arch/loongarch/lib/memcpy.S | 8 | ||||
| -rw-r--r-- | arch/loongarch/lib/memmove.S | 20 | ||||
| -rw-r--r-- | arch/loongarch/lib/memset.S | 8 | ||||
| -rw-r--r-- | arch/loongarch/mm/Makefile | 3 | ||||
| -rw-r--r-- | arch/loongarch/mm/kasan_init.c | 243 | ||||
| -rw-r--r-- | arch/loongarch/vdso/Makefile | 1 |
14 files changed, 451 insertions, 9 deletions
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 0619ec165424..32157188d5b8 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -8,6 +8,7 @@ config LOONGARCH select ACPI_PPTT 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 @@ -92,6 +93,7 @@ config LOONGARCH select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_JUMP_LABEL_RELATIVE + select HAVE_ARCH_KASAN select HAVE_ARCH_KFENCE select HAVE_ARCH_KGDB if PERF_EVENTS select HAVE_ARCH_MMAP_RND_BITS if MMU @@ -669,6 +671,11 @@ config ARCH_MMAP_RND_BITS_MAX config ARCH_SUPPORTS_UPROBES def_bool y +config KASAN_SHADOW_OFFSET + hex + default 0x0 + depends on KASAN + menu "Power management options" config ARCH_SUSPEND_POSSIBLE diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile index ef87bab46754..fb0fada43197 100644 --- a/arch/loongarch/Makefile +++ b/arch/loongarch/Makefile @@ -84,7 +84,10 @@ LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext endif cflags-y += $(call cc-option, -mno-check-zero-division) + +ifndef CONFIG_KASAN cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset +endif load-y = 0x9000000000200000 bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) diff --git a/arch/loongarch/include/asm/kasan.h b/arch/loongarch/include/asm/kasan.h new file mode 100644 index 000000000000..deeff8158f45 --- /dev/null +++ b/arch/loongarch/include/asm/kasan.h @@ -0,0 +1,126 @@ +/* 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 (0x8000) +#define XKPRANGE_CC_SEG (0x9000) +#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(KFENCE_AREA_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(KFENCE_AREA_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]; + +#define kasan_arch_is_ready kasan_arch_is_ready +static __always_inline bool kasan_arch_is_ready(void) +{ + return !kasan_early_stage; +} + +static inline void *kasan_mem_to_shadow(const void *addr) +{ + if (!kasan_arch_is_ready()) { + 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; + } +} + +void kasan_init(void); +asmlinkage void kasan_early_init(void); + +#endif +#endif diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index 7e3708883994..e5675ce0907a 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -89,9 +89,16 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #endif #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 - KFENCE_AREA_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 - KFENCE_AREA_SIZE) +#endif #define vmemmap ((struct page *)((VMALLOC_END + PMD_SIZE) & PMD_MASK)) #define VMEMMAP_END ((unsigned long)vmemmap + VMEMMAP_SIZE - 1) diff --git a/arch/loongarch/include/asm/string.h b/arch/loongarch/include/asm/string.h index 7b29cc9c70aa..5bb5a90d2681 100644 --- a/arch/loongarch/include/asm/string.h +++ b/arch/loongarch/include/asm/string.h @@ -7,11 +7,31 @@ #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) + +#ifndef __NO_FORTIFY +#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */ +#endif + +#endif #endif /* _ASM_STRING_H */ diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile index c0b88528cb81..c56ea0b75448 100644 --- a/arch/loongarch/kernel/Makefile +++ b/arch/loongarch/kernel/Makefile @@ -34,6 +34,12 @@ ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_rethook_trampoline.o = $(CC_FLAGS_FTRACE) endif +KASAN_SANITIZE_efi.o := n +KASAN_SANITIZE_cpu-probe.o := n +KASAN_SANITIZE_traps.o := n +KASAN_SANITIZE_smp.o := n +KASAN_SANITIZE_vdso.o := n + obj-$(CONFIG_MODULES) += module.o module-sections.o obj-$(CONFIG_STACKTRACE) += stacktrace.o diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S index 5743fef70dfe..53b883db0786 100644 --- a/arch/loongarch/kernel/head.S +++ b/arch/loongarch/kernel/head.S @@ -104,6 +104,10 @@ SYM_CODE_START(kernel_entry) # kernel entry point #endif /* CONFIG_RELOCATABLE */ +#ifdef CONFIG_KASAN + bl kasan_early_init +#endif + bl start_kernel ASM_BUG() diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c index 9d830ab4e302..7783f0a3d742 100644 --- a/arch/loongarch/kernel/setup.c +++ b/arch/loongarch/kernel/setup.c @@ -626,4 +626,8 @@ void __init setup_arch(char **cmdline_p) #endif paging_init(); + +#ifdef CONFIG_KASAN + kasan_init(); +#endif } diff --git a/arch/loongarch/lib/memcpy.S b/arch/loongarch/lib/memcpy.S index cc30b3b6252f..fa1148878d2b 100644 --- a/arch/loongarch/lib/memcpy.S +++ b/arch/loongarch/lib/memcpy.S @@ -10,6 +10,8 @@ #include <asm/cpu.h> #include <asm/regdef.h> +.section .noinstr.text, "ax" + SYM_FUNC_START(memcpy) /* * Some CPUs support hardware unaligned access @@ -17,9 +19,13 @@ SYM_FUNC_START(memcpy) ALTERNATIVE "b __memcpy_generic", \ "b __memcpy_fast", CPU_FEATURE_UAL SYM_FUNC_END(memcpy) -_ASM_NOKPROBE(memcpy) +SYM_FUNC_ALIAS(__memcpy, memcpy) EXPORT_SYMBOL(memcpy) +EXPORT_SYMBOL(__memcpy) + +_ASM_NOKPROBE(memcpy) +_ASM_NOKPROBE(__memcpy) /* * void *__memcpy_generic(void *dst, const void *src, size_t n) diff --git a/arch/loongarch/lib/memmove.S b/arch/loongarch/lib/memmove.S index 7dc76d1484b6..82dae062fec8 100644 --- a/arch/loongarch/lib/memmove.S +++ b/arch/loongarch/lib/memmove.S @@ -10,23 +10,29 @@ #include <asm/cpu.h> #include <asm/regdef.h> +.section .noinstr.text, "ax" + SYM_FUNC_START(memmove) - blt a0, a1, memcpy /* dst < src, memcpy */ - blt a1, a0, rmemcpy /* src < dst, rmemcpy */ - jr ra /* dst == src, return */ + blt a0, a1, __memcpy /* dst < src, memcpy */ + blt a1, a0, __rmemcpy /* src < dst, rmemcpy */ + jr ra /* dst == src, return */ SYM_FUNC_END(memmove) -_ASM_NOKPROBE(memmove) +SYM_FUNC_ALIAS(__memmove, memmove) EXPORT_SYMBOL(memmove) +EXPORT_SYMBOL(__memmove) + +_ASM_NOKPROBE(memmove) +_ASM_NOKPROBE(__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) -_ASM_NOKPROBE(rmemcpy) +SYM_FUNC_END(__rmemcpy) +_ASM_NOKPROBE(__rmemcpy) /* * void *__rmemcpy_generic(void *dst, const void *src, size_t n) diff --git a/arch/loongarch/lib/memset.S b/arch/loongarch/lib/memset.S index 3f20f7996e8e..06d3ca54cbfe 100644 --- a/arch/loongarch/lib/memset.S +++ b/arch/loongarch/lib/memset.S @@ -16,6 +16,8 @@ bstrins.d \r0, \r0, 63, 32 .endm +.section .noinstr.text, "ax" + SYM_FUNC_START(memset) /* * Some CPUs support hardware unaligned access @@ -23,9 +25,13 @@ SYM_FUNC_START(memset) ALTERNATIVE "b __memset_generic", \ "b __memset_fast", CPU_FEATURE_UAL SYM_FUNC_END(memset) -_ASM_NOKPROBE(memset) +SYM_FUNC_ALIAS(__memset, memset) EXPORT_SYMBOL(memset) +EXPORT_SYMBOL(__memset) + +_ASM_NOKPROBE(memset) +_ASM_NOKPROBE(__memset) /* * void *__memset_generic(void *s, int c, size_t n) diff --git a/arch/loongarch/mm/Makefile b/arch/loongarch/mm/Makefile index 8ffc6383f836..e4d1e581dbae 100644 --- a/arch/loongarch/mm/Makefile +++ b/arch/loongarch/mm/Makefile @@ -7,3 +7,6 @@ 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 diff --git a/arch/loongarch/mm/kasan_init.c b/arch/loongarch/mm/kasan_init.c new file mode 100644 index 000000000000..da68bc1a4643 --- /dev/null +++ b/arch/loongarch/mm/kasan_init.c @@ -0,0 +1,243 @@ +// 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 kasan_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); + +#ifdef __PAGETABLE_PUD_FOLDED +#define __p4d_none(early, p4d) (0) +#else +#define __p4d_none(early, p4d) (early ? (p4d_val(p4d) == 0) : \ +(__pa(p4d_val(p4d)) == (unsigned long)__pa(kasan_early_shadow_pud))) +#endif + +#ifdef __PAGETABLE_PMD_FOLDED +#define __pud_none(early, pud) (0) +#else +#define __pud_none(early, pud) (early ? (pud_val(pud) == 0) : \ +(__pa(pud_val(pud)) == (unsigned long)__pa(kasan_early_shadow_pmd))) +#endif + +#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 *__init 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 pmd_t *__init 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 __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_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 __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(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); + +} + +/* 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); +} + +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)); +} + +static inline void kasan_set_pgd(pgd_t *pgdp, pgd_t pgdval) +{ + WRITE_ONCE(*pgdp, pgdval); +} + +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(kasan_pg_dir, swapper_pg_dir, sizeof(kasan_pg_dir)); + csr_write64(__pa_symbol(kasan_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 *)VMALLOC_START), + kasan_mem_to_shadow((void *)KFENCE_AREA_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); + 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"); +} diff --git a/arch/loongarch/vdso/Makefile b/arch/loongarch/vdso/Makefile index d8b75f07c869..5c97d1463328 100644 --- a/arch/loongarch/vdso/Makefile +++ b/arch/loongarch/vdso/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 # Objects to go into the VDSO. +KASAN_SANITIZE := n KCOV_INSTRUMENT := n # Include the generic Makefile to check the built vdso. |