linux-hardening - Re: [PATCH][next] kgdb: Fix fall-through warning for Clang

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Date:   Tue, 1 Jun 2021 17:13:42 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] kgdb: Fix fall-through warning for Clang



On 6/1/21 14:20, Kees Cook wrote:
> On Fri, May 28, 2021 at 03:02:22PM -0500, Gustavo A. R. Silva wrote:
>> In preparation to enable -Wimplicit-fallthrough for Clang, fix a
>> fall-through warning by explicitly adding a goto statement instead
>> of letting the code fall through to the next case.
>>
>> Link: https://github.com/KSPP/linux/issues/115
>> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
>> ---
>> JFYI: We had thousands of these sorts of warnings and now we are down
>>       to just 25 in linux-next. This is one of those last remaining
>>       warnings.
> 
> So close! :)

Almost there!

> Reviewed-by: Kees Cook <keescook@...omium.org>

Thanks

--
Gustavo

> 
> -Kees
> 
>>
>>  kernel/debug/debug_core.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
>> index 4708aec492df..431749dd9ab6 100644
>> --- a/kernel/debug/debug_core.c
>> +++ b/kernel/debug/debug_core.c
>> @@ -1038,6 +1038,7 @@ dbg_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
>>  	switch (kgdbreboot) {
>>  	case 1:
>>  		kgdb_breakpoint();
>> +		goto done;
>>  	case -1:
>>  		goto done;
>>  	}
>> -- 
>> 2.27.0
>>
>