linux-kernel - Re: [PATCH v4 05/45] asm-generic: instrument usercopy in cacheflush.h

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Message-ID: <CANpmjNM-hotpgDZqHvutHedoEbyeuuNeoPQ5UR4Op8rs6itr3g@mail.gmail.com>
Date:   Tue, 12 Jul 2022 16:17:09 +0200
From:   Marco Elver <elver@...gle.com>
To:     Alexander Potapenko <glider@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 05/45] asm-generic: instrument usercopy in cacheflush.h

On Fri, 1 Jul 2022 at 16:23, Alexander Potapenko <glider@...gle.com> wrote:
>
> Notify memory tools about usercopy events in copy_to_user_page() and
> copy_from_user_page().
>
> Signed-off-by: Alexander Potapenko <glider@...gle.com>

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


> ---
> Link: https://linux-review.googlesource.com/id/Ic1ee8da1886325f46ad67f52176f48c2c836c48f
> ---
>  include/asm-generic/cacheflush.h | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
> index 4f07afacbc239..0f63eb325025f 100644
> --- a/include/asm-generic/cacheflush.h
> +++ b/include/asm-generic/cacheflush.h
> @@ -2,6 +2,8 @@
>  #ifndef _ASM_GENERIC_CACHEFLUSH_H
>  #define _ASM_GENERIC_CACHEFLUSH_H
>
> +#include <linux/instrumented.h>
> +
>  struct mm_struct;
>  struct vm_area_struct;
>  struct page;
> @@ -105,6 +107,7 @@ static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
>  #ifndef copy_to_user_page
>  #define copy_to_user_page(vma, page, vaddr, dst, src, len)     \
>         do { \
> +               instrument_copy_to_user(dst, src, len); \
>                 memcpy(dst, src, len); \
>                 flush_icache_user_page(vma, page, vaddr, len); \
>         } while (0)
> @@ -112,7 +115,11 @@ static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
>
>  #ifndef copy_from_user_page
>  #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
> -       memcpy(dst, src, len)
> +       do { \
> +               instrument_copy_from_user_before(dst, src, len); \
> +               memcpy(dst, src, len); \
> +               instrument_copy_from_user_after(dst, src, len, 0); \
> +       } while (0)
>  #endif
>
>  #endif /* _ASM_GENERIC_CACHEFLUSH_H */
> --
> 2.37.0.rc0.161.g10f37bed90-goog
>