From: Andrey Konovalov <[email protected]>
Add a kasan_print_aux_stacks() helper that prints the auxiliary stack
traces for the Generic mode.
This change hides references to alloc_meta from the common reporting code.
This is desired as only the Generic mode will be using per-object metadata
after this series.
Reviewed-by: Marco Elver <[email protected]>
Signed-off-by: Andrey Konovalov <[email protected]>
---
mm/kasan/kasan.h | 6 ++++++
mm/kasan/report.c | 15 +--------------
mm/kasan/report_generic.c | 20 ++++++++++++++++++++
3 files changed, 27 insertions(+), 14 deletions(-)
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 15c718782c1f..30ff341b6d35 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -266,6 +266,12 @@ void kasan_print_address_stack_frame(const void *addr);
static inline void kasan_print_address_stack_frame(const void *addr) { }
#endif
+#ifdef CONFIG_KASAN_GENERIC
+void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object);
+#else
+static inline void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object) { }
+#endif
+
bool kasan_report(unsigned long addr, size_t size,
bool is_write, unsigned long ip);
void kasan_report_invalid_free(void *object, unsigned long ip, enum kasan_report_type type);
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index fe3f606b3a98..cd9f5c7fc6db 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -270,20 +270,7 @@ static void describe_object_stacks(struct kmem_cache *cache, void *object,
pr_err("\n");
}
-#ifdef CONFIG_KASAN_GENERIC
- if (!alloc_meta)
- return;
- if (alloc_meta->aux_stack[0]) {
- pr_err("Last potentially related work creation:\n");
- stack_depot_print(alloc_meta->aux_stack[0]);
- pr_err("\n");
- }
- if (alloc_meta->aux_stack[1]) {
- pr_err("Second to last potentially related work creation:\n");
- stack_depot_print(alloc_meta->aux_stack[1]);
- pr_err("\n");
- }
-#endif
+ kasan_print_aux_stacks(cache, object);
}
static void describe_object(struct kmem_cache *cache, void *object,
diff --git a/mm/kasan/report_generic.c b/mm/kasan/report_generic.c
index 6689fb9a919b..348dc207d462 100644
--- a/mm/kasan/report_generic.c
+++ b/mm/kasan/report_generic.c
@@ -132,6 +132,26 @@ void kasan_metadata_fetch_row(char *buffer, void *row)
memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW);
}
+void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object)
+{
+ struct kasan_alloc_meta *alloc_meta;
+
+ alloc_meta = kasan_get_alloc_meta(cache, object);
+ if (!alloc_meta)
+ return;
+
+ if (alloc_meta->aux_stack[0]) {
+ pr_err("Last potentially related work creation:\n");
+ stack_depot_print(alloc_meta->aux_stack[0]);
+ pr_err("\n");
+ }
+ if (alloc_meta->aux_stack[1]) {
+ pr_err("Second to last potentially related work creation:\n");
+ stack_depot_print(alloc_meta->aux_stack[1]);
+ pr_err("\n");
+ }
+}
+
#ifdef CONFIG_KASAN_STACK
static bool __must_check tokenize_frame_descr(const char **frame_descr,
char *token, size_t max_tok_len,
--
2.25.1