linux-kernel - [PATCH mm 03/21] kasan: document kasan_mempool_poison

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Message-Id: <af33ba8cabfa1ad731fe23a3f874bfc8d3b7fed4.1703024586.git.andreyknvl@google.com>
Date: Tue, 19 Dec 2023 23:28:47 +0100
From: andrey.konovalov@...ux.dev
To: Marco Elver <elver@...gle.com>,
	Alexander Potapenko <glider@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	kasan-dev@...glegroups.com,
	Evgenii Stepanov <eugenis@...gle.com>,
	Breno Leitao <leitao@...ian.org>,
	Alexander Lobakin <alobakin@...me>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm 03/21] kasan: document kasan_mempool_poison_object

From: Andrey Konovalov <andreyknvl@...gle.com>

Add documentation comment for kasan_mempool_poison_object.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 include/linux/kasan.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 0d1f925c136d..bbf6e2fa4ffd 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -213,6 +213,24 @@ static __always_inline void * __must_check kasan_krealloc(const void *object,
 }
 
 void __kasan_mempool_poison_object(void *ptr, unsigned long ip);
+/**
+ * kasan_mempool_poison_object - Check and poison a mempool slab allocation.
+ * @ptr: Pointer to the slab allocation.
+ *
+ * This function is intended for kernel subsystems that cache slab allocations
+ * to reuse them instead of freeing them back to the slab allocator (e.g.
+ * mempool).
+ *
+ * This function poisons a slab allocation without initializing its memory and
+ * without putting it into the quarantine (for the Generic mode).
+ *
+ * This function also performs checks to detect double-free and invalid-free
+ * bugs and reports them.
+ *
+ * This function operates on all slab allocations including large kmalloc
+ * allocations (the ones returned by kmalloc_large() or by kmalloc() with the
+ * size > KMALLOC_MAX_SIZE).
+ */
 static __always_inline void kasan_mempool_poison_object(void *ptr)
 {
 	if (kasan_enabled())
-- 
2.25.1