linux-kernel - Re: [PATCH 09/32] kasan: clear metadata functions for tag-based modes

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Date:   Mon, 20 Jun 2022 15:39:52 +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 09/32] kasan: clear metadata functions for tag-based modes

On Mon, 13 Jun 2022 at 22:16, <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Remove implementations of the metadata-related functions for the tag-based
> modes.
>
> The following patches in the series will provide alternative
> implementations.
>
> As of this patch, the tag-based modes no longer collect alloc and free
> stack traces. This functionality will be restored later in the series.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

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


> ---
>  mm/kasan/tags.c | 33 ++-------------------------------
>  1 file changed, 2 insertions(+), 31 deletions(-)
>
> diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c
> index 2e200969a4b8..f11c89505c77 100644
> --- a/mm/kasan/tags.c
> +++ b/mm/kasan/tags.c
> @@ -19,54 +19,25 @@
>
>  void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
>  {
> -       struct kasan_alloc_meta *alloc_meta;
> -
> -       alloc_meta = kasan_get_alloc_meta(cache, object);
> -       if (alloc_meta)
> -               __memset(alloc_meta, 0, sizeof(*alloc_meta));
>  }
>
>  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)
>  {
> -       struct kasan_alloc_meta *alloc_meta;
> -
> -       alloc_meta = kasan_get_alloc_meta(cache, object);
> -       if (!alloc_meta)
> -               return;
> -
> -       kasan_set_track(&alloc_meta->free_track, GFP_NOWAIT);
>  }
>
>  struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache,
>                                                 void *object)
>  {
> -       struct kasan_alloc_meta *alloc_meta;
> -
> -       alloc_meta = kasan_get_alloc_meta(cache, object);
> -       if (!alloc_meta)
> -               return NULL;
> -
> -       return &alloc_meta->alloc_track;
> +       return NULL;
>  }
>
>  struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
>                                                 void *object, u8 tag)
>  {
> -       struct kasan_alloc_meta *alloc_meta;
> -
> -       alloc_meta = kasan_get_alloc_meta(cache, object);
> -       if (!alloc_meta)
> -               return NULL;
> -
> -       return &alloc_meta->free_track;
> +       return NULL;
>  }
> --
> 2.25.1
>
> --
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