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

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Message-ID: <YMhO4oiqh4F+ZEW8@infradead.org>
Date:   Tue, 15 Jun 2021 07:55:30 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
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()

> @@ -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?