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kasan: introduce kasan_print_aux_stacks 

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.

Link: https://lkml.kernel.org/r/67c7a9ea6615533762b1f8ccc267cd7f9bafb749.1662411799.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>
This commit is contained in:
Andrey Konovalov 2022-09-05 23:05:21 +02:00 committed by Andrew Morton
parent 687c85afa6
commit 88f29765ae
3 changed files with 27 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
mm/kasan/kasan.h
View File

@ -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);

15
mm/kasan/report.c
View File

@ -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,

20
mm/kasan/report_generic.c
View File

@ -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,