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[RFC,20/20] io_uring: use mempool KASAN hook

Message ID 4f2fc546ce7b494c99c08e282c4d697d6dd58a8f.1699297309.git.andreyknvl@google.com (mailing list archive)
State New
Headers show
Series kasan: save mempool stack traces | expand

Commit Message

andrey.konovalov@linux.dev Nov. 6, 2023, 8:10 p.m. UTC 
From: Andrey Konovalov <andreyknvl@google.com>

Use the proper kasan_mempool_unpoison_object hook for unpoisoning cached
objects.

A future change might also update io_uring to check the return value of
kasan_mempool_poison_object to prevent double-free and invalid-free bugs.
This proves to be non-trivial with the current way io_uring caches
objects, so this is left out-of-scope of this series.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 io_uring/alloc_cache.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h
index 8de0414e8efe..bf2fb26a6539 100644
--- a/io_uring/alloc_cache.h
+++ b/io_uring/alloc_cache.h
@@ -33,7 +33,7 @@  static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *c
 		struct io_cache_entry *entry;
 
 		entry = container_of(cache->list.next, struct io_cache_entry, node);
-		kasan_unpoison_range(entry, cache->elem_size);
+		kasan_mempool_unpoison_object(entry, cache->elem_size);
 		cache->list.next = cache->list.next->next;
 		cache->nr_cached--;
 		return entry;