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kasan, arm64: only use kasan_depth for software modes

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This is a preparatory commit for the upcoming addition of a new hardware
tag-based (MTE-based) KASAN mode.

Hardware tag-based KASAN won't use kasan_depth.  Only define and use it
when one of the software KASAN modes are enabled.

No functional changes for software modes.

Link: https://lkml.kernel.org/r/e16f15aeda90bc7fb4dfc2e243a14b74cc5c8219.1606161801.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: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2020-12-22 12:00:56 -08:00 committed by Linus Torvalds
parent afe6ef80dc
commit d73b49365e
6 changed files with 23 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/arm64/mm/kasan_init.c
View File

@ -273,17 +273,22 @@ static void __init kasan_init_shadow(void)
cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
}
static void __init kasan_init_depth(void)
{
init_task.kasan_depth = 0;
}
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) */
static inline void __init kasan_init_shadow(void) { }
static inline void __init kasan_init_depth(void) { }
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
void __init kasan_init(void)
{
kasan_init_shadow();
/* At this point kasan is fully initialized. Enable error messages */
init_task.kasan_depth = 0;
kasan_init_depth();
pr_info("KernelAddressSanitizer initialized\n");
}

18
include/linux/kasan.h
View File

@ -52,6 +52,12 @@ static inline void *kasan_mem_to_shadow(const void *addr)
int kasan_add_zero_shadow(void *start, unsigned long size);
void kasan_remove_zero_shadow(void *start, unsigned long size);
/* Enable reporting bugs after kasan_disable_current() */
extern void kasan_enable_current(void);
/* Disable reporting bugs for current task */
extern void kasan_disable_current(void);
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
static inline int kasan_add_zero_shadow(void *start, unsigned long size)
@ -62,16 +68,13 @@ static inline void kasan_remove_zero_shadow(void *start,
unsigned long size)
{}
static inline void kasan_enable_current(void) {}
static inline void kasan_disable_current(void) {}
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
#ifdef CONFIG_KASAN
/* Enable reporting bugs after kasan_disable_current() */
extern void kasan_enable_current(void);
/* Disable reporting bugs for current task */
extern void kasan_disable_current(void);
void kasan_unpoison_range(const void *address, size_t size);
void kasan_unpoison_task_stack(struct task_struct *task);
@ -122,9 +125,6 @@ static inline void kasan_unpoison_range(const void *address, size_t size) {}
static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
static inline void kasan_enable_current(void) {}
static inline void kasan_disable_current(void) {}
static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
static inline void kasan_free_pages(struct page *page, unsigned int order) {}

2
include/linux/sched.h
View File

@ -1234,7 +1234,7 @@ struct task_struct {
u64 timer_slack_ns;
u64 default_timer_slack_ns;
#ifdef CONFIG_KASAN
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
unsigned int kasan_depth;
#endif

2
init/init_task.c
View File

@ -176,7 +176,7 @@ struct task_struct init_task
.numa_group = NULL,
.numa_faults = NULL,
#endif
#ifdef CONFIG_KASAN
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
.kasan_depth = 1,
#endif
#ifdef CONFIG_KCSAN

2
mm/kasan/common.c
View File

@ -46,6 +46,7 @@ void kasan_set_track(struct kasan_track *track, gfp_t flags)
track->stack = kasan_save_stack(flags);
}
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
void kasan_enable_current(void)
{
current->kasan_depth++;
@ -55,6 +56,7 @@ void kasan_disable_current(void)
{
current->kasan_depth--;
}
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
void kasan_unpoison_range(const void *address, size_t size)
{

2
mm/kasan/report.c
View File

@ -292,8 +292,10 @@ static void print_shadow_for_address(const void *addr)
static bool report_enabled(void)
{
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
if (current->kasan_depth)
return false;
#endif
if (test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags))
return true;
return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags);