aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorAndrey Konovalov <andreyknvl@google.com>2020-12-10 15:42:13 +1100
committerStephen Rothwell <sfr@canb.auug.org.au>2020-12-16 18:03:00 +1100
commit0056ad3c8323b8f3840814b09941a771ab64281f (patch)
tree7d95386c3f88c1f6e6fc86ed28a6c498de81fb2f
parenta07e244d3e4c83b88437bf529bb2f1884e336b74 (diff)
downloadlinux-0056ad3c8323b8f3840814b09941a771ab64281f.tar.gz
kasan, arm64: expand CONFIG_KASAN checks
Some #ifdef CONFIG_KASAN checks are only relevant for software KASAN modes (either related to shadow memory or compiler instrumentation). Expand those into CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS. Link: https://lkml.kernel.org/r/e6971e432dbd72bb897ff14134ebb7e169bdcf0c.1606161801.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Alexander Potapenko <glider@google.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Marco Elver <elver@google.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
-rw-r--r--arch/arm64/Kconfig2
-rw-r--r--arch/arm64/Makefile2
-rw-r--r--arch/arm64/include/asm/assembler.h2
-rw-r--r--arch/arm64/include/asm/memory.h2
-rw-r--r--arch/arm64/include/asm/string.h5
-rw-r--r--arch/arm64/kernel/head.S2
-rw-r--r--arch/arm64/kernel/image-vars.h2
-rw-r--r--arch/arm64/kernel/kaslr.c3
-rw-r--r--arch/arm64/kernel/module.c6
-rw-r--r--arch/arm64/mm/ptdump.c6
-rw-r--r--include/linux/kasan-checks.h2
-rw-r--r--include/linux/kasan.h7
-rw-r--r--include/linux/moduleloader.h3
-rw-r--r--include/linux/string.h2
-rw-r--r--mm/ptdump.c13
-rw-r--r--scripts/Makefile.lib2
16 files changed, 36 insertions, 25 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 35ac59986e42..be2375fccb75 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -335,7 +335,7 @@ config BROKEN_GAS_INST
config KASAN_SHADOW_OFFSET
hex
- depends on KASAN
+ depends on KASAN_GENERIC || KASAN_SW_TAGS
default 0xdfff800000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && !KASAN_SW_TAGS
default 0xdfffc00000000000 if ARM64_VA_BITS_47 && !KASAN_SW_TAGS
default 0xdffffe0000000000 if ARM64_VA_BITS_42 && !KASAN_SW_TAGS
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 05f46a60b245..6be9b3750250 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -137,7 +137,7 @@ head-y := arch/arm64/kernel/head.o
ifeq ($(CONFIG_KASAN_SW_TAGS), y)
KASAN_SHADOW_SCALE_SHIFT := 4
-else
+else ifeq ($(CONFIG_KASAN_GENERIC), y)
KASAN_SHADOW_SCALE_SHIFT := 3
endif
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index ddbe6bf00e33..bf125c591116 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -473,7 +473,7 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU
#define NOKPROBE(x)
#endif
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
#define EXPORT_SYMBOL_NOKASAN(name)
#else
#define EXPORT_SYMBOL_NOKASAN(name) EXPORT_SYMBOL(name)
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 3bc08e6cf82e..cd671fb6707c 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -72,7 +72,7 @@
* address space for the shadow region respectively. They can bloat the stack
* significantly, so double the (minimum) stack size when they are in use.
*/
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
#define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
+ KASAN_SHADOW_OFFSET)
diff --git a/arch/arm64/include/asm/string.h b/arch/arm64/include/asm/string.h
index b31e8e87a0db..3a3264ff47b9 100644
--- a/arch/arm64/include/asm/string.h
+++ b/arch/arm64/include/asm/string.h
@@ -5,7 +5,7 @@
#ifndef __ASM_STRING_H
#define __ASM_STRING_H
-#ifndef CONFIG_KASAN
+#if !(defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
#define __HAVE_ARCH_STRRCHR
extern char *strrchr(const char *, int c);
@@ -48,7 +48,8 @@ extern void *__memset(void *, int, __kernel_size_t);
void memcpy_flushcache(void *dst, const void *src, size_t cnt);
#endif
-#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
+#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
+ !defined(__SANITIZE_ADDRESS__)
/*
* For files that are not instrumented (e.g. mm/slub.c) we
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 42b23ce679dc..a0dc987724ed 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -433,7 +433,7 @@ SYM_FUNC_START_LOCAL(__primary_switched)
bl __pi_memset
dsb ishst // Make zero page visible to PTW
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
bl kasan_early_init
#endif
#ifdef CONFIG_RANDOMIZE_BASE
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index 39289d75118d..f676243abac6 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -37,7 +37,7 @@ __efistub_strncmp = __pi_strncmp;
__efistub_strrchr = __pi_strrchr;
__efistub___clean_dcache_area_poc = __pi___clean_dcache_area_poc;
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
__efistub___memcpy = __pi_memcpy;
__efistub___memmove = __pi_memmove;
__efistub___memset = __pi_memset;
diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c
index 0921aa1520b0..1c74c45b9494 100644
--- a/arch/arm64/kernel/kaslr.c
+++ b/arch/arm64/kernel/kaslr.c
@@ -161,7 +161,8 @@ u64 __init kaslr_early_init(u64 dt_phys)
/* use the top 16 bits to randomize the linear region */
memstart_offset_seed = seed >> 48;
- if (IS_ENABLED(CONFIG_KASAN))
+ if (IS_ENABLED(CONFIG_KASAN_GENERIC) ||
+ IS_ENABLED(CONFIG_KASAN_SW_TAGS))
/*
* KASAN does not expect the module region to intersect the
* vmalloc region, since shadow memory is allocated for each
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c
index 2a1ad95d9b2c..fe21e0f06492 100644
--- a/arch/arm64/kernel/module.c
+++ b/arch/arm64/kernel/module.c
@@ -30,7 +30,8 @@ void *module_alloc(unsigned long size)
if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS))
gfp_mask |= __GFP_NOWARN;
- if (IS_ENABLED(CONFIG_KASAN))
+ if (IS_ENABLED(CONFIG_KASAN_GENERIC) ||
+ IS_ENABLED(CONFIG_KASAN_SW_TAGS))
/* don't exceed the static module region - see below */
module_alloc_end = MODULES_END;
@@ -39,7 +40,8 @@ void *module_alloc(unsigned long size)
NUMA_NO_NODE, __builtin_return_address(0));
if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) &&
- !IS_ENABLED(CONFIG_KASAN))
+ !IS_ENABLED(CONFIG_KASAN_GENERIC) &&
+ !IS_ENABLED(CONFIG_KASAN_SW_TAGS))
/*
* KASAN can only deal with module allocations being served
* from the reserved module region, since the remainder of
diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index 807dc634bbd2..04137a8f3d2d 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c
@@ -29,7 +29,7 @@
enum address_markers_idx {
PAGE_OFFSET_NR = 0,
PAGE_END_NR,
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
KASAN_START_NR,
#endif
};
@@ -37,7 +37,7 @@ enum address_markers_idx {
static struct addr_marker address_markers[] = {
{ PAGE_OFFSET, "Linear Mapping start" },
{ 0 /* PAGE_END */, "Linear Mapping end" },
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
{ 0 /* KASAN_SHADOW_START */, "Kasan shadow start" },
{ KASAN_SHADOW_END, "Kasan shadow end" },
#endif
@@ -383,7 +383,7 @@ void ptdump_check_wx(void)
static int ptdump_init(void)
{
address_markers[PAGE_END_NR].start_address = PAGE_END;
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START;
#endif
ptdump_initialize();
diff --git a/include/linux/kasan-checks.h b/include/linux/kasan-checks.h
index ac6aba632f2d..ca5e89fb10d3 100644
--- a/include/linux/kasan-checks.h
+++ b/include/linux/kasan-checks.h
@@ -9,7 +9,7 @@
* even in compilation units that selectively disable KASAN, but must use KASAN
* to validate access to an address. Never use these in header files!
*/
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
bool __kasan_check_read(const volatile void *p, unsigned int size);
bool __kasan_check_write(const volatile void *p, unsigned int size);
#else
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index d7042d129dc1..b1381ee6922a 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -238,7 +238,8 @@ static inline void kasan_release_vmalloc(unsigned long start,
#endif /* CONFIG_KASAN_VMALLOC */
-#if defined(CONFIG_KASAN) && !defined(CONFIG_KASAN_VMALLOC)
+#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
+ !defined(CONFIG_KASAN_VMALLOC)
/*
* These functions provide a special case to support backing module
@@ -248,12 +249,12 @@ static inline void kasan_release_vmalloc(unsigned long start,
int kasan_module_alloc(void *addr, size_t size);
void kasan_free_shadow(const struct vm_struct *vm);
-#else /* CONFIG_KASAN && !CONFIG_KASAN_VMALLOC */
+#else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
static inline void kasan_free_shadow(const struct vm_struct *vm) {}
-#endif /* CONFIG_KASAN && !CONFIG_KASAN_VMALLOC */
+#endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
#ifdef CONFIG_KASAN_INLINE
void kasan_non_canonical_hook(unsigned long addr);
diff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h
index 4fa67a8b2265..9e09d11ffe5b 100644
--- a/include/linux/moduleloader.h
+++ b/include/linux/moduleloader.h
@@ -96,7 +96,8 @@ void module_arch_cleanup(struct module *mod);
/* Any cleanup before freeing mod->module_init */
void module_arch_freeing_init(struct module *mod);
-#if defined(CONFIG_KASAN) && !defined(CONFIG_KASAN_VMALLOC)
+#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
+ !defined(CONFIG_KASAN_VMALLOC)
#include <linux/kasan.h>
#define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
#else
diff --git a/include/linux/string.h b/include/linux/string.h
index 1cd63a8a23ab..4fcfb56abcf5 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -267,7 +267,7 @@ void __write_overflow(void) __compiletime_error("detected write beyond size of o
#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
diff --git a/mm/ptdump.c b/mm/ptdump.c
index ba88ec43ff21..4354c1422d57 100644
--- a/mm/ptdump.c
+++ b/mm/ptdump.c
@@ -4,7 +4,7 @@
#include <linux/ptdump.h>
#include <linux/kasan.h>
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
/*
* This is an optimization for KASAN=y case. Since all kasan page tables
* eventually point to the kasan_early_shadow_page we could call note_page()
@@ -31,7 +31,8 @@ static int ptdump_pgd_entry(pgd_t *pgd, unsigned long addr,
struct ptdump_state *st = walk->private;
pgd_t val = READ_ONCE(*pgd);
-#if CONFIG_PGTABLE_LEVELS > 4 && defined(CONFIG_KASAN)
+#if CONFIG_PGTABLE_LEVELS > 4 && \
+ (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
if (pgd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_p4d)))
return note_kasan_page_table(walk, addr);
#endif
@@ -51,7 +52,8 @@ static int ptdump_p4d_entry(p4d_t *p4d, unsigned long addr,
struct ptdump_state *st = walk->private;
p4d_t val = READ_ONCE(*p4d);
-#if CONFIG_PGTABLE_LEVELS > 3 && defined(CONFIG_KASAN)
+#if CONFIG_PGTABLE_LEVELS > 3 && \
+ (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
if (p4d_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pud)))
return note_kasan_page_table(walk, addr);
#endif
@@ -71,7 +73,8 @@ static int ptdump_pud_entry(pud_t *pud, unsigned long addr,
struct ptdump_state *st = walk->private;
pud_t val = READ_ONCE(*pud);
-#if CONFIG_PGTABLE_LEVELS > 2 && defined(CONFIG_KASAN)
+#if CONFIG_PGTABLE_LEVELS > 2 && \
+ (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS))
if (pud_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pmd)))
return note_kasan_page_table(walk, addr);
#endif
@@ -91,7 +94,7 @@ static int ptdump_pmd_entry(pmd_t *pmd, unsigned long addr,
struct ptdump_state *st = walk->private;
pmd_t val = READ_ONCE(*pmd);
-#if defined(CONFIG_KASAN)
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
if (pmd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pte)))
return note_kasan_page_table(walk, addr);
#endif
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 94133708889d..213677a5ed33 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -148,10 +148,12 @@ endif
# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
#
ifeq ($(CONFIG_KASAN),y)
+ifneq ($(CONFIG_KASAN_HW_TAGS),y)
_c_flags += $(if $(patsubst n%,, \
$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
endif
+endif
ifeq ($(CONFIG_UBSAN),y)
_c_flags += $(if $(patsubst n%,, \