+ kasan-implement-stack-ring-for-tag-based-modes-fix.patch added to mm-unstable branch

+ kasan-implement-stack-ring-for-tag-based-modes-fix.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: kasan: initialize read-write lock in stack ring
has been added to the -mm mm-unstable branch.  Its filename is
     kasan-implement-stack-ring-for-tag-based-modes-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kasan-implement-stack-ring-for-tag-based-modes-fix.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: kasan: initialize read-write lock in stack ring
Date: Tue, 20 Sep 2022 20:58:07 +0200

Use __RW_LOCK_UNLOCKED to initialize stack_ring.lock.

Link: https://lkml.kernel.org/r/576182d194e27531e8090bad809e4136953895f4.1663700262.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reported-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/kasan/tags.c~kasan-implement-stack-ring-for-tag-based-modes-fix
+++ a/mm/kasan/tags.c
@@ -22,7 +22,9 @@
 /* Non-zero, as initial pointer values are 0. */
 #define STACK_RING_BUSY_PTR ((void *)1)
 
-struct kasan_stack_ring stack_ring;
+struct kasan_stack_ring stack_ring = {
+	.lock = __RW_LOCK_UNLOCKED(stack_ring.lock)
+};
 
 static void save_stack_info(struct kmem_cache *cache, void *object,
 			gfp_t gfp_flags, bool is_free)
_

Patches currently in -mm which might be from andreyknvl@google.com are

kasan-check-kasan_no_free_meta-in-__kasan_metadata_size.patch
kasan-rename-kasan_set__info-to-kasan_save__info.patch
kasan-move-is_kmalloc-check-out-of-save_alloc_info.patch
kasan-split-save_alloc_info-implementations.patch
kasan-drop-config_kasan_tags_identify.patch
kasan-introduce-kasan_print_aux_stacks.patch
kasan-introduce-kasan_get_alloc_track.patch
kasan-introduce-kasan_init_object_meta.patch
kasan-clear-metadata-functions-for-tag-based-modes.patch
kasan-move-kasan_get__meta-to-genericc.patch
kasan-introduce-kasan_requires_meta.patch
kasan-introduce-kasan_init_cache_meta.patch
kasan-drop-config_kasan_generic-check-from-kasan_init_cache_meta.patch
kasan-only-define-kasan_metadata_size-for-generic-mode.patch
kasan-only-define-kasan_never_merge-for-generic-mode.patch
kasan-only-define-metadata-offsets-for-generic-mode.patch
kasan-only-define-metadata-structs-for-generic-mode.patch
kasan-only-define-kasan_cache_create-for-generic-mode.patch
kasan-pass-tagged-pointers-to-kasan_save_alloc-free_info.patch
kasan-move-kasan_get_alloc-free_track-definitions.patch
kasan-cosmetic-changes-in-reportc.patch
kasan-use-virt_addr_valid-in-kasan_addr_to_page-slab.patch
kasan-use-kasan_addr_to_slab-in-print_address_description.patch
kasan-make-kasan_addr_to_page-static.patch
kasan-simplify-print_report.patch
kasan-introduce-complete_report_info.patch
kasan-fill-in-cache-and-object-in-complete_report_info.patch
kasan-rework-function-arguments-in-reportc.patch
kasan-introduce-kasan_complete_mode_report_info.patch
kasan-implement-stack-ring-for-tag-based-modes.patch
kasan-implement-stack-ring-for-tag-based-modes-fix.patch
kasan-support-kasanstacktrace-for-sw_tags.patch
kasan-dynamically-allocate-stack-ring-entries.patch
kasan-better-identify-bug-types-for-tag-based-modes.patch
kasan-add-another-use-after-free-test.patch
kasan-move-tests-to-mm-kasan.patch
kasan-better-invalid-double-free-report-header.patch