linux-kernel - [PATCH mm 2/4] kasan: reuse kasan_track in kasan_stack_ring

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Message-Id: <20231221183540.168428-2-andrey.konovalov@linux.dev>
Date: Thu, 21 Dec 2023 19:35:38 +0100
From: andrey.konovalov@...ux.dev
To: Andrew Morton <akpm@...ux-foundation.org>,
	Juntong Deng <juntong.deng@...look.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
	Marco Elver <elver@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	kasan-dev@...glegroups.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm 2/4] kasan: reuse kasan_track in kasan_stack_ring_entry

From: Andrey Konovalov <andreyknvl@...gle.com>

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

Fixes: 5d4c6ac94694 ("kasan: record and report more information")
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/kasan.h       |  7 +------
 mm/kasan/report_tags.c | 12 ++++++------
 mm/kasan/tags.c        | 12 ++++++------
 3 files changed, 13 insertions(+), 18 deletions(-)

diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 5e298e3ac909..9072ce4c1263 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -279,13 +279,8 @@ 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 {
diff --git a/mm/kasan/report_tags.c b/mm/kasan/report_tags.c
index 979f284c2497..688b9d70b04a 100644
--- a/mm/kasan/report_tags.c
+++ b/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 */
diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c
index c13b198b8302..c4d14dbf27c0 100644
--- a/mm/kasan/tags.c
+++ b/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;
 
-- 
2.25.1