linux-kernel - Re: [PATCH] skbuff: Mark expected switch fall-throughs

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Date:   Tue, 16 Oct 2018 15:41:24 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] skbuff: Mark expected switch fall-throughs

On Mon, Oct 15, 2018 at 2:30 PM, Kees Cook <keescook@...omium.org> wrote:
> On Sat, Oct 13, 2018 at 4:56 AM, Gustavo A. R. Silva
> <gustavo@...eddedor.com> wrote:
>> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
>> where we are expecting to fall through.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>
> Acked-by: Kees Cook <keescook@...omium.org>

Actually, since this is skbuff, can you resend this to netdev instead?
Andrew took the other two, but this one seems like it should go via
David Miller.

Thanks!

-Kees

>
> -Kees
>
>> ---
>>  include/linux/skbuff.h | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
>> index 119d092..92ec346 100644
>> --- a/include/linux/skbuff.h
>> +++ b/include/linux/skbuff.h
>> @@ -3505,13 +3505,19 @@ static inline bool __skb_metadata_differs(const struct sk_buff *skb_a,
>>  #define __it(x, op) (x -= sizeof(u##op))
>>  #define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op))
>>         case 32: diffs |= __it_diff(a, b, 64);
>> +               /* fall through */
>>         case 24: diffs |= __it_diff(a, b, 64);
>> +               /* fall through */
>>         case 16: diffs |= __it_diff(a, b, 64);
>> +               /* fall through */
>>         case  8: diffs |= __it_diff(a, b, 64);
>>                 break;
>>         case 28: diffs |= __it_diff(a, b, 64);
>> +               /* fall through */
>>         case 20: diffs |= __it_diff(a, b, 64);
>> +               /* fall through */
>>         case 12: diffs |= __it_diff(a, b, 64);
>> +               /* fall through */
>>         case  4: diffs |= __it_diff(a, b, 32);
>>                 break;
>>         }
>> --
>> 2.7.4
>>
>
>
>
> --
> Kees Cook
> Pixel Security



-- 
Kees Cook
Pixel Security