linux-kernel - Re: [PATCH 7/7] powerpc/signal: Use unsafe_copy_siginfo_to

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Date:   Tue, 15 Jun 2021 09:00:58 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] powerpc/signal: Use unsafe_copy_siginfo_to_user()



Le 15/06/2021 à 08:55, Christoph Hellwig a écrit :
>> @@ -836,14 +830,19 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
>>   		asm("dcbst %y0; sync; icbi %y0; sync" :: "Z" (mctx->mc_pad[0]));
>>   	}
>>   	unsafe_put_sigset_t(&frame->uc.uc_sigmask, oldset, failed);
>> +#ifndef CONFIG_COMPAT
>> +	unsafe_copy_siginfo_to_user(&frame->info, &ksig->info, failed);
>> +#endif
>>   
>>   	/* create a stack frame for the caller of the handler */
>>   	unsafe_put_user(regs->gpr[1], newsp, failed);
>>   
>>   	user_access_end();
>>   
>> -	if (copy_siginfo_to_user(&frame->info, &ksig->info))
>> +#ifdef CONFIG_COMPAT
>> +	if (copy_siginfo_to_user32(&frame->info, &ksig->info))
>>   		goto badframe;
>> +#endif
> 
> Shouldn't the compat case be handled the same way?
> 

It would be best, but it is not that easy to convert. So for the time being it is left aside, anyway 
compat is for compatibility, so performance doesn't matter so much.