linux-kernel - Re: [PATCH] crypto: rsassa-pkcs1

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Message-ID: <Z0rPxCGdD7r8HFKb@wunner.de>
Date: Sat, 30 Nov 2024 09:41:40 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Zorro Lang <zlang@...hat.com>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] crypto: rsassa-pkcs1 - Copy source data for SG list

On Fri, Nov 29, 2024 at 05:53:16PM +0800, Herbert Xu wrote:
> As virtual addresses in general may not be suitable for DMA, always
> perform a copy before using them in an SG list.

Just a heads-up, this won't work for use cases when the src buffer
isn't accessible by the kernel.  E.g. if the virtual address pointed to
by src is in TEE restricted memory which was mapped into virtual address
space by dma_buf_vmap():

https://lore.kernel.org/all/20241128150927.1377981-1-jens.wiklander@linaro.org/

Thanks,

Lukas