summaryrefslogtreecommitdiff
path: root/mm/kasan
diff options
context:
space:
mode:
authorAndrey Konovalov <andreyknvl@google.com>2023-12-21 23:04:46 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-12-29 22:58:44 +0300
commit3067b919ed81e17b8b8fb932c43f200775b1d545 (patch)
tree042af0fec3f1c1f5169c9aaf627524cb9ce4e033 /mm/kasan
parentc20e3feadd4505c46a87dcabef5b129a97992466 (diff)
downloadlinux-3067b919ed81e17b8b8fb932c43f200775b1d545.tar.xz
kasan: clean up kasan_requires_meta
Currently, for Generic KASAN mode, kasan_requires_meta is defined to return kasan_stack_collection_enabled. Even though the Generic mode does not support disabling stack trace collection, kasan_requires_meta was implemented in this way to make it easier to implement the disabling for the Generic mode in the future. However, for the Generic mode, the per-object metadata also stores the quarantine link. So even if disabling stack collection is implemented, the per-object metadata will still be required. Fix kasan_requires_meta to return true for the Generic mode and update the related comments. This change does not fix any observable bugs but rather just brings the code to a cleaner state. Link: https://lkml.kernel.org/r/8086623407095ac1c82377a2107dcc5845f99cfa.1703188911.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/kasan.h18
1 files changed, 9 insertions, 9 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 0e209b823b2c..38af25b9c89c 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -101,21 +101,21 @@ static inline bool kasan_sample_page_alloc(unsigned int order)
#ifdef CONFIG_KASAN_GENERIC
-/* Generic KASAN uses per-object metadata to store stack traces. */
+/*
+ * Generic KASAN uses per-object metadata to store alloc and free stack traces
+ * and the quarantine link.
+ */
static inline bool kasan_requires_meta(void)
{
- /*
- * Technically, Generic KASAN always collects stack traces right now.
- * However, let's use kasan_stack_collection_enabled() in case the
- * kasan.stacktrace command-line argument is changed to affect
- * Generic KASAN.
- */
- return kasan_stack_collection_enabled();
+ return true;
}
#else /* CONFIG_KASAN_GENERIC */
-/* Tag-based KASAN modes do not use per-object metadata. */
+/*
+ * Tag-based KASAN modes do not use per-object metadata: they use the stack
+ * ring to store alloc and free stack traces and do not use qurantine.
+ */
static inline bool kasan_requires_meta(void)
{
return false;