kasan: reuse kasan_track in kasan_stack_ring_entry

Avoid duplicating fields of kasan_track in kasan_stack_ring_entry: reuse
the structure.

Link: https://lkml.kernel.org/r/20231221183540.168428-2-andrey.konovalov@linux.dev
Fixes: 5d4c6ac9 ("kasan: record and report more information")
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: Juntong Deng <juntong.deng@outlook.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/kasan/kasan.h

@@ -293,13 +293,8 @@ struct kasan_free_meta {
 struct kasan_stack_ring_entry {
 	void *ptr;
 	size_t size;
-	u32 pid;
-	depot_stack_handle_t stack;
+	struct kasan_track track;
 	bool is_free;
-#ifdef CONFIG_KASAN_EXTRA_INFO
-	u64 cpu:20;
-	u64 timestamp:44;
-#endif /* CONFIG_KASAN_EXTRA_INFO */
 };
 
 struct kasan_stack_ring {

mm/kasan/report_tags.c

@@ -31,8 +31,8 @@ static const char *get_common_bug_type(struct kasan_report_info *info)
 static void kasan_complete_extra_report_info(struct kasan_track *track,
 					 struct kasan_stack_ring_entry *entry)
 {
-	track->cpu = entry->cpu;
-	track->timestamp = entry->timestamp;
+	track->cpu = entry->track.cpu;
+	track->timestamp = entry->track.timestamp;
 }
 #endif /* CONFIG_KASAN_EXTRA_INFO */
 
@@ -80,8 +80,8 @@ void kasan_complete_mode_report_info(struct kasan_report_info *info)
 			if (free_found)
 				break;
 
-			info->free_track.pid = entry->pid;
-			info->free_track.stack = entry->stack;
+			info->free_track.pid = entry->track.pid;
+			info->free_track.stack = entry->track.stack;
 #ifdef CONFIG_KASAN_EXTRA_INFO
 			kasan_complete_extra_report_info(&info->free_track, entry);
 #endif /* CONFIG_KASAN_EXTRA_INFO */
@@ -98,8 +98,8 @@ void kasan_complete_mode_report_info(struct kasan_report_info *info)
 			if (alloc_found)
 				break;
 
-			info->alloc_track.pid = entry->pid;
-			info->alloc_track.stack = entry->stack;
+			info->alloc_track.pid = entry->track.pid;
+			info->alloc_track.stack = entry->track.stack;
 #ifdef CONFIG_KASAN_EXTRA_INFO
 			kasan_complete_extra_report_info(&info->alloc_track, entry);
 #endif /* CONFIG_KASAN_EXTRA_INFO */

mm/kasan/tags.c

@@ -100,8 +100,8 @@ static void save_extra_info(struct kasan_stack_ring_entry *entry)
 	u32 cpu = raw_smp_processor_id();
 	u64 ts_nsec = local_clock();
 
-	entry->cpu = cpu;
-	entry->timestamp = ts_nsec >> 3;
+	entry->track.cpu = cpu;
+	entry->track.timestamp = ts_nsec >> 3;
 }
 #endif /* CONFIG_KASAN_EXTRA_INFO */
 
@@ -134,15 +134,15 @@ static void save_stack_info(struct kmem_cache *cache, void *object,
 	if (!try_cmpxchg(&entry->ptr, &old_ptr, STACK_RING_BUSY_PTR))
 		goto next; /* Busy slot. */
 
-	old_stack = entry->stack;
+	old_stack = entry->track.stack;
 
 	entry->size = cache->object_size;
-	entry->pid = current->pid;
-	entry->stack = stack;
-	entry->is_free = is_free;
+	entry->track.pid = current->pid;
+	entry->track.stack = stack;
 #ifdef CONFIG_KASAN_EXTRA_INFO
 	save_extra_info(entry);
 #endif /* CONFIG_KASAN_EXTRA_INFO */
+	entry->is_free = is_free;
 
 	entry->ptr = object;