linux-kernel - [PATCH 4/6] kasan: common: provide can_alloc in kasan_save

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Date:   Tue,  7 Sep 2021 16:13:05 +0200
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vijayanand Jitta <vjitta@...eaurora.org>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Aleksandr Nogikh <nogikh@...gle.com>,
        Taras Madan <tarasmadan@...gle.com>
Subject: [PATCH 4/6] kasan: common: provide can_alloc in kasan_save_stack()

Add another argument, can_alloc, to kasan_save_stack() which is passed
as-is to __stack_depot_save().

No functional change intended.

Signed-off-by: Marco Elver <elver@...gle.com>
---
 mm/kasan/common.c  | 6 +++---
 mm/kasan/generic.c | 2 +-
 mm/kasan/kasan.h   | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 2baf121fb8c5..3e0999892c36 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -30,20 +30,20 @@
 #include "kasan.h"
 #include "../slab.h"
 
-depot_stack_handle_t kasan_save_stack(gfp_t flags)
+depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc)
 {
 	unsigned long entries[KASAN_STACK_DEPTH];
 	unsigned int nr_entries;
 
 	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
 	nr_entries = filter_irq_stacks(entries, nr_entries);
-	return stack_depot_save(entries, nr_entries, flags);
+	return __stack_depot_save(entries, nr_entries, flags, can_alloc);
 }
 
 void kasan_set_track(struct kasan_track *track, gfp_t flags)
 {
 	track->pid = current->pid;
-	track->stack = kasan_save_stack(flags);
+	track->stack = kasan_save_stack(flags, true);
 }
 
 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index c3f5ba7a294a..2a8e59e6326d 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -345,7 +345,7 @@ void kasan_record_aux_stack(void *addr)
 		return;
 
 	alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
-	alloc_meta->aux_stack[0] = kasan_save_stack(GFP_NOWAIT);
+	alloc_meta->aux_stack[0] = kasan_save_stack(GFP_NOWAIT, true);
 }
 
 void kasan_set_free_info(struct kmem_cache *cache,
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index fa02c88b6948..e442d94a8f6e 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -260,7 +260,7 @@ void kasan_report_invalid_free(void *object, unsigned long ip);
 
 struct page *kasan_addr_to_page(const void *addr);
 
-depot_stack_handle_t kasan_save_stack(gfp_t flags);
+depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc);
 void kasan_set_track(struct kasan_track *track, gfp_t flags);
 void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag);
 struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
-- 
2.33.0.153.gba50c8fa24-goog