linux-kernel - Re: [PATCH RFC v2 18/21] kasan: rename kasan_poison

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Date:   Wed, 28 Oct 2020 17:58:03 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Serban Constantinescu <serbanc@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC v2 18/21] kasan: rename kasan_poison_kfree

On Thu, Oct 22, 2020 at 3:20 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
>
> Rename kasan_poison_kfree() into kasan_slab_free_mempool() as it better
> reflects what this annotation does.
>
> No functional changes.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Link: https://linux-review.googlesource.com/id/I5026f87364e556b506ef1baee725144bb04b8810

Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>

> ---
>  include/linux/kasan.h | 16 ++++++++--------
>  mm/kasan/common.c     | 16 ++++++++--------
>  mm/mempool.c          |  2 +-
>  3 files changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/include/linux/kasan.h b/include/linux/kasan.h
> index 8654275aa62e..2ae92f295f76 100644
> --- a/include/linux/kasan.h
> +++ b/include/linux/kasan.h
> @@ -162,6 +162,13 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned
>         return false;
>  }
>
> +void __kasan_slab_free_mempool(void *ptr, unsigned long ip);
> +static inline void kasan_slab_free_mempool(void *ptr, unsigned long ip)
> +{
> +       if (static_branch_likely(&kasan_enabled))
> +               __kasan_slab_free_mempool(ptr, ip);
> +}
> +
>  void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
>                                        void *object, gfp_t flags);
>  static inline void * __must_check kasan_slab_alloc(struct kmem_cache *s,
> @@ -202,13 +209,6 @@ static inline void * __must_check kasan_krealloc(const void *object,
>         return (void *)object;
>  }
>
> -void __kasan_poison_kfree(void *ptr, unsigned long ip);
> -static inline void kasan_poison_kfree(void *ptr, unsigned long ip)
> -{
> -       if (static_branch_likely(&kasan_enabled))
> -               __kasan_poison_kfree(ptr, ip);
> -}
> -
>  void __kasan_kfree_large(void *ptr, unsigned long ip);
>  static inline void kasan_kfree_large(void *ptr, unsigned long ip)
>  {
> @@ -244,6 +244,7 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
>  {
>         return false;
>  }
> +static inline void kasan_slab_free_mempool(void *ptr, unsigned long ip) {}
>  static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
>                                    gfp_t flags)
>  {
> @@ -264,7 +265,6 @@ static inline void *kasan_krealloc(const void *object, size_t new_size,
>  {
>         return (void *)object;
>  }
> -static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
>  static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
>
>  #endif /* CONFIG_KASAN */
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index b82dbae0c5d6..5622b0ec0907 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -334,6 +334,14 @@ bool __kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
>         return ____kasan_slab_free(cache, object, ip, true);
>  }
>
> +void __kasan_slab_free_mempool(void *ptr, unsigned long ip)
> +{
> +       struct page *page;
> +
> +       page = virt_to_head_page(ptr);
> +       ____kasan_slab_free(page->slab_cache, ptr, ip, false);
> +}
> +
>  static void set_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
>  {
>         kasan_set_track(&kasan_get_alloc_meta(cache, object)->alloc_track, flags);
> @@ -436,14 +444,6 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag
>                                                 flags, true);
>  }
>
> -void __kasan_poison_kfree(void *ptr, unsigned long ip)
> -{
> -       struct page *page;
> -
> -       page = virt_to_head_page(ptr);
> -       ____kasan_slab_free(page->slab_cache, ptr, ip, false);
> -}
> -
>  void __kasan_kfree_large(void *ptr, unsigned long ip)
>  {
>         if (ptr != page_address(virt_to_head_page(ptr)))
> diff --git a/mm/mempool.c b/mm/mempool.c
> index 79bff63ecf27..0e8d877fbbc6 100644
> --- a/mm/mempool.c
> +++ b/mm/mempool.c
> @@ -106,7 +106,7 @@ static inline void poison_element(mempool_t *pool, void *element)
>  static __always_inline void kasan_poison_element(mempool_t *pool, void *element)
>  {
>         if (pool->alloc == mempool_alloc_slab || pool->alloc == mempool_kmalloc)
> -               kasan_poison_kfree(element, _RET_IP_);
> +               kasan_slab_free_mempool(element, _RET_IP_);
>         if (pool->alloc == mempool_alloc_pages)
>                 kasan_free_pages(element, (unsigned long)pool->pool_data);
>  }
> --
> 2.29.0.rc1.297.gfa9743e501-goog
>