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

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Message-ID: <Z066Aqy3kipGicnw@gondor.apana.org.au>
Date: Tue, 3 Dec 2024 15:57:54 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Lukas Wunner <lukas@...ner.de>
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 Sat, Nov 30, 2024 at 09:41:40AM +0100, Lukas Wunner wrote:
>
> 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/

If it's not accessible by the kernel, why would you map into the
kernel page table? That just makes no sense.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt