linux-kernel - Re: [PATCH net-next] rxrpc: Reuse SKCIPHER_REQUEST_ON

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Date:   Fri, 03 Aug 2018 09:49:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dhowells@...hat.com
Cc:     netdev@...r.kernel.org, keescook@...omium.org, arnd@...db.de,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] rxrpc: Reuse SKCIPHER_REQUEST_ON_STACK buffer

From: David Howells <dhowells@...hat.com>
Date: Fri, 03 Aug 2018 10:15:25 +0100

> From: Kees Cook <keescook@...omium.org>
> 
> The use of SKCIPHER_REQUEST_ON_STACK() will trigger FRAME_WARN warnings
> (when less than 2048) once the VLA is no longer hidden from the check:
> 
> net/rxrpc/rxkad.c:398:1: warning: the frame size of 1152 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> net/rxrpc/rxkad.c:242:1: warning: the frame size of 1152 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> This passes the initial SKCIPHER_REQUEST_ON_STACK allocation to the leaf
> functions for reuse. Two requests allocated on the stack is not needed
> when only one is used at a time.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: David Howells <dhowells@...hat.com>

Applied, thank you.