diff mbox series

[v2,18/19] kasan: check object_size in kasan_complete_mode_report_info

Message ID 293d73bcd89932bc026263d3df8ee281ad3f621f.1694625260.git.andreyknvl@google.com
State New
Headers
Series stackdepot: allow evicting stack traces |

Commit Message

andrey.konovalov@linux.dev Sept. 13, 2023, 5:14 p.m. UTC 
  From: Andrey Konovalov <andreyknvl@google.com>

Check the object size when looking up entries in the stack ring.

If the size of the object for which a report is being printed does not
match the size of the object for which a stack trace has been saved in
the stack ring, the saved stack trace is irrelevant.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>

---

Changes v1->v2:
- This is a new patch.
---
 mm/kasan/report_tags.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Alexander Potapenko Oct. 9, 2023, 12:17 p.m. UTC | #1 
On Wed, Sep 13, 2023 at 7:18 PM <andrey.konovalov@linux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@google.com>
>
> Check the object size when looking up entries in the stack ring.
>
> If the size of the object for which a report is being printed does not
> match the size of the object for which a stack trace has been saved in
> the stack ring, the saved stack trace is irrelevant.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
diff mbox series

Patch

diff --git a/mm/kasan/report_tags.c b/mm/kasan/report_tags.c
index 78abdcde5da9..98c238ba3545 100644
--- a/mm/kasan/report_tags.c
+++ b/mm/kasan/report_tags.c
@@ -58,7 +58,8 @@  void kasan_complete_mode_report_info(struct kasan_report_info *info)
 		entry = &stack_ring.entries[i % stack_ring.size];
 
 		if (kasan_reset_tag(entry->ptr) != info->object ||
-		    get_tag(entry->ptr) != get_tag(info->access_addr))
+		    get_tag(entry->ptr) != get_tag(info->access_addr) ||
+		    info->cache->object_size != entry->size)
 			continue;
 
 		if (entry->is_free) {