diff options
| author | Andrey Konovalov <andreyknvl@google.com> | 2022-09-06 00:05:46 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-04 00:03:01 +0300 |
| commit | 7ebfce33125100e3f0c5e059845a019a1401433d (patch) | |
| tree | b02449fd4156bd3e43c1e12dd407a096b21b0816 /mm/kasan/kasan.h | |
| parent | 7bc0584e5d2a687c0855a1b3dec9a6d6857d757b (diff) | |
| download | linux-7ebfce33125100e3f0c5e059845a019a1401433d.tar.xz | |
kasan: support kasan.stacktrace for SW_TAGS
Add support for the kasan.stacktrace command-line argument for Software
Tag-Based KASAN.
The following patch adds a command-line argument for selecting the stack
ring size, and, as the stack ring is supported by both the Software and
the Hardware Tag-Based KASAN modes, it is natural that both of them have
support for kasan.stacktrace too.
Link: https://lkml.kernel.org/r/3b43059103faa7f8796017847b7d674b658f11b5.1662411799.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan/kasan.h')
| -rw-r--r-- | mm/kasan/kasan.h | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index cfff81139d67..447baf1a7a2e 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -8,13 +8,31 @@ #include <linux/kfence.h> #include <linux/stackdepot.h> -#ifdef CONFIG_KASAN_HW_TAGS +#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) #include <linux/static_key.h> + +DECLARE_STATIC_KEY_TRUE(kasan_flag_stacktrace); + +static inline bool kasan_stack_collection_enabled(void) +{ + return static_branch_unlikely(&kasan_flag_stacktrace); +} + +#else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ + +static inline bool kasan_stack_collection_enabled(void) +{ + return true; +} + +#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ + +#ifdef CONFIG_KASAN_HW_TAGS + #include "../slab.h" DECLARE_STATIC_KEY_TRUE(kasan_flag_vmalloc); -DECLARE_STATIC_KEY_TRUE(kasan_flag_stacktrace); enum kasan_mode { KASAN_MODE_SYNC, @@ -29,11 +47,6 @@ static inline bool kasan_vmalloc_enabled(void) return static_branch_likely(&kasan_flag_vmalloc); } -static inline bool kasan_stack_collection_enabled(void) -{ - return static_branch_unlikely(&kasan_flag_stacktrace); -} - static inline bool kasan_async_fault_possible(void) { return kasan_mode == KASAN_MODE_ASYNC || kasan_mode == KASAN_MODE_ASYMM; @@ -46,11 +59,6 @@ static inline bool kasan_sync_fault_possible(void) #else /* CONFIG_KASAN_HW_TAGS */ -static inline bool kasan_stack_collection_enabled(void) -{ - return true; -} - static inline bool kasan_async_fault_possible(void) { return false; @@ -410,6 +418,10 @@ static inline void kasan_enable_tagging(void) { } #endif /* CONFIG_KASAN_HW_TAGS */ +#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) +void __init kasan_init_tags(void); +#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ + #if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) void kasan_force_async_fault(void); |