linux-kernel - Re: [PATCH 04/32] kasan: split save_alloc

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Message-ID: <CANpmjNNdz58SKo0P8grXsP7ik_2wOiiJEbiN3ycGMrR1Xw9w7A@mail.gmail.com>
Date:   Mon, 20 Jun 2022 15:39:39 +0200
From:   Marco Elver <elver@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Florian Mayer <fmayer@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH 04/32] kasan: split save_alloc_info implementations

On Mon, 13 Jun 2022 at 22:15, <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Provide standalone implementations of save_alloc_info() for the Generic
> and tag-based modes.
>
> For now, the implementations are the same, but they will diverge later
> in the series.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

Reviewed-by: Marco Elver <elver@...gle.com>


> ---
>  mm/kasan/common.c  | 13 ++-----------
>  mm/kasan/generic.c |  9 +++++++++
>  mm/kasan/kasan.h   |  1 +
>  mm/kasan/tags.c    |  9 +++++++++
>  4 files changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index a6107e8375e0..2848c7a2402a 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -423,15 +423,6 @@ void __kasan_slab_free_mempool(void *ptr, unsigned long ip)
>         }
>  }
>
> -static void save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
> -{
> -       struct kasan_alloc_meta *alloc_meta;
> -
> -       alloc_meta = kasan_get_alloc_meta(cache, object);
> -       if (alloc_meta)
> -               kasan_set_track(&alloc_meta->alloc_track, flags);
> -}
> -
>  void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
>                                         void *object, gfp_t flags, bool init)
>  {
> @@ -462,7 +453,7 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
>
>         /* Save alloc info (if possible) for non-kmalloc() allocations. */
>         if (kasan_stack_collection_enabled() && !cache->kasan_info.is_kmalloc)
> -               save_alloc_info(cache, (void *)object, flags);
> +               kasan_save_alloc_info(cache, (void *)object, flags);
>
>         return tagged_object;
>  }
> @@ -508,7 +499,7 @@ static inline void *____kasan_kmalloc(struct kmem_cache *cache,
>          * This also rewrites the alloc info when called from kasan_krealloc().
>          */
>         if (kasan_stack_collection_enabled() && cache->kasan_info.is_kmalloc)
> -               save_alloc_info(cache, (void *)object, flags);
> +               kasan_save_alloc_info(cache, (void *)object, flags);
>
>         /* Keep the tag that was set by kasan_slab_alloc(). */
>         return (void *)object;
> diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
> index 03a3770cfeae..98c451a3b01f 100644
> --- a/mm/kasan/generic.c
> +++ b/mm/kasan/generic.c
> @@ -358,6 +358,15 @@ void kasan_record_aux_stack_noalloc(void *addr)
>         return __kasan_record_aux_stack(addr, false);
>  }
>
> +void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
> +{
> +       struct kasan_alloc_meta *alloc_meta;
> +
> +       alloc_meta = kasan_get_alloc_meta(cache, object);
> +       if (alloc_meta)
> +               kasan_set_track(&alloc_meta->alloc_track, flags);
> +}
> +
>  void kasan_save_free_info(struct kmem_cache *cache,
>                                 void *object, u8 tag)
>  {
> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> index 6df8d7b01073..610057e651d2 100644
> --- a/mm/kasan/kasan.h
> +++ b/mm/kasan/kasan.h
> @@ -284,6 +284,7 @@ struct slab *kasan_addr_to_slab(const void *addr);
>
>  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_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags);
>  void kasan_save_free_info(struct kmem_cache *cache, void *object, u8 tag);
>  struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
>                                 void *object, u8 tag);
> diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c
> index b453a353bc86..1ba3c8399f72 100644
> --- a/mm/kasan/tags.c
> +++ b/mm/kasan/tags.c
> @@ -17,6 +17,15 @@
>
>  #include "kasan.h"
>
> +void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
> +{
> +       struct kasan_alloc_meta *alloc_meta;
> +
> +       alloc_meta = kasan_get_alloc_meta(cache, object);
> +       if (alloc_meta)
> +               kasan_set_track(&alloc_meta->alloc_track, flags);
> +}
> +
>  void kasan_save_free_info(struct kmem_cache *cache,
>                                 void *object, u8 tag)
>  {
> --
> 2.25.1
>
> --
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