kasan-implement-stack-ring-for-tag-based-modes.patch removed from -mm tree

The quilt patch titled
Subject: kasan: implement stack ring for tag-based modes
has been removed from the -mm tree. Its filename was
kasan-implement-stack-ring-for-tag-based-modes.patch

This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Andrey Konovalov <[email protected]>
Subject: kasan: implement stack ring for tag-based modes
Date: Mon, 5 Sep 2022 23:05:45 +0200

Implement storing stack depot handles for alloc/free stack traces for slab objects for the tag-based KASAN modes in a ring buffer.

This ring buffer is referred to as the stack ring.

On each alloc/free of a slab object, the tagged address of the object and the current stack trace are recorded in the stack ring.

On each bug report, if the accessed address belongs to a slab object, the stack ring is scanned for matching entries. The newest entries are used to print the alloc/free stack traces in the report: one entry for alloc and one for free.

The number of entries in the stack ring is fixed in this patch, but one of the following patches adds a command-line argument to control it.

---

 mm/kasan/kasan.h       |   21 +++++++++++
 mm/kasan/report_tags.c |   71 +++++++++++++++++++++++++++++++++++++++
 mm/kasan/tags.c        |   52 ++++++++++++++++++++++++++++
 3 files changed, 144 insertions(+)

@@ -2,6 +2,7 @@
 #ifndef __MM_KASAN_KASAN_H
 #define __MM_KASAN_KASAN_H
 
+#include <linux/atomic.h>
 #include <linux/kasan.h>
 #include <linux/kasan-tags.h>
 #include <linux/kfence.h>

@@ -233,6 +234,26 @@ struct kasan_free_meta {
 
 #endif /* CONFIG_KASAN_GENERIC */
 
+#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
+
+struct kasan_stack_ring_entry {
+	void *ptr;
+	size_t size;
+	u32 pid;
+	depot_stack_handle_t stack;
+	bool is_free;
+};
+
+#define KASAN_STACK_RING_SIZE (32 << 10)
+
+struct kasan_stack_ring {
+	rwlock_t lock;
+	atomic64_t pos;
+	struct kasan_stack_ring_entry entries[KASAN_STACK_RING_SIZE];
+};
+
+#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
+
 #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
 /* Used in KUnit-compatible KASAN tests. */
 struct kunit_kasan_status {

_

Patches currently in -mm which might be from [email protected] are

kasan-fix-array-bounds-warnings-in-tests.patch