The quilt patch titled
Subject: kasan: handle concurrent kasan_record_aux_stack calls
has been removed from the -mm tree. Its filename was
kasan-handle-concurrent-kasan_record_aux_stack-calls.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 <andreyknvl@xxxxxxxxxx>
Subject: kasan: handle concurrent kasan_record_aux_stack calls
Date: Tue, 19 Dec 2023 22:19:51 +0100
kasan_record_aux_stack can be called concurrently on the same object.
This might lead to a race condition when rotating the saved aux stack
trace handles, which in turns leads to incorrect accounting of stack depot
handles and refcount underflows in the stack depot code.
Fix by introducing a raw spinlock to protect the aux stack trace handles
in kasan_record_aux_stack.
Link: https://lkml.kernel.org/r/1606b960e2f746862d1f459515972f9695bf448a.1703020707.git.andreyknvl@xxxxxxxxxx
Fixes: 773688a6cb24 ("kasan: use stack_depot_put for Generic mode")
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Reported-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Reported-by: syzbot+186b55175d8360728234@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lore.kernel.org/all/000000000000784b1c060b0074a2@xxxxxxxxxx/
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Evgenii Stepanov <eugenis@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kasan/generic.c | 32 +++++++++++++++++++++++++++++---
mm/kasan/kasan.h | 8 ++++++++
2 files changed, 37 insertions(+), 3 deletions(-)
--- a/mm/kasan/generic.c~kasan-handle-concurrent-kasan_record_aux_stack-calls
+++ a/mm/kasan/generic.c
@@ -25,6 +25,7 @@
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/slab.h>
+#include <linux/spinlock.h>
#include <linux/stackdepot.h>
#include <linux/stacktrace.h>
#include <linux/string.h>
@@ -471,8 +472,18 @@ void kasan_init_object_meta(struct kmem_
struct kasan_free_meta *free_meta;
alloc_meta = kasan_get_alloc_meta(cache, object);
- if (alloc_meta)
+ if (alloc_meta) {
__memset(alloc_meta, 0, sizeof(*alloc_meta));
+
+ /*
+ * Temporarily disable KASAN bug reporting to allow instrumented
+ * raw_spin_lock_init to access aux_lock, which resides inside
+ * of a redzone.
+ */
+ kasan_disable_current();
+ raw_spin_lock_init(&alloc_meta->aux_lock);
+ kasan_enable_current();
+ }
free_meta = kasan_get_free_meta(cache, object);
if (free_meta)
__memset(free_meta, 0, sizeof(*free_meta));
@@ -502,6 +513,8 @@ static void __kasan_record_aux_stack(voi
struct kmem_cache *cache;
struct kasan_alloc_meta *alloc_meta;
void *object;
+ depot_stack_handle_t new_handle, old_handle;
+ unsigned long flags;
if (is_kfence_address(addr) || !slab)
return;
@@ -512,9 +525,22 @@ static void __kasan_record_aux_stack(voi
if (!alloc_meta)
return;
- stack_depot_put(alloc_meta->aux_stack[1]);
+ new_handle = kasan_save_stack(0, depot_flags);
+
+ /*
+ * Temporarily disable KASAN bug reporting to allow instrumented
+ * spinlock functions to access aux_lock, which resides inside of a
+ * redzone.
+ */
+ kasan_disable_current();
+ raw_spin_lock_irqsave(&alloc_meta->aux_lock, flags);
+ old_handle = alloc_meta->aux_stack[1];
alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
- alloc_meta->aux_stack[0] = kasan_save_stack(0, depot_flags);
+ alloc_meta->aux_stack[0] = new_handle;
+ raw_spin_unlock_irqrestore(&alloc_meta->aux_lock, flags);
+ kasan_enable_current();
+
+ stack_depot_put(old_handle);
}
void kasan_record_aux_stack(void *addr)
--- a/mm/kasan/kasan.h~kasan-handle-concurrent-kasan_record_aux_stack-calls
+++ a/mm/kasan/kasan.h
@@ -6,6 +6,7 @@
#include <linux/kasan.h>
#include <linux/kasan-tags.h>
#include <linux/kfence.h>
+#include <linux/spinlock.h>
#include <linux/stackdepot.h>
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
@@ -249,6 +250,13 @@ struct kasan_global {
struct kasan_alloc_meta {
struct kasan_track alloc_track;
/* Free track is stored in kasan_free_meta. */
+ /*
+ * aux_lock protects aux_stack from accesses from concurrent
+ * kasan_record_aux_stack calls. It is a raw spinlock to avoid sleeping
+ * on RT kernels, as kasan_record_aux_stack_noalloc can be called from
+ * non-sleepable contexts.
+ */
+ raw_spinlock_t aux_lock;
depot_stack_handle_t aux_stack[2];
};
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
kasan-stop-leaking-stack-trace-handles.patch
