linux-kernel - Re: [PATCH] crypto: ccp - Limit memory allocation in SEV_GET

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Message-ID: <Y5rxd6ZVBqFCBOUT@gondor.apana.org.au>
Date:   Thu, 15 Dec 2022 18:05:43 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Peter Gonda <pgonda@...gle.com>
Cc:     Andy Nguyen <theflow@...gle.com>,
        David Rientjes <rientjes@...gle.com>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        John Allen <john.allen@....com>,
        "Thomas . Lendacky" <thomas.lendacky@....com>
Subject: Re: [PATCH] crypto: ccp - Limit memory allocation in SEV_GET_ID2
 ioctl

On Wed, Dec 14, 2022 at 12:20:46PM -0800, Peter Gonda wrote:
> Currently userspace can ask for any uint32 size allocation for the
> SEV_GET_ID2. Limit this allocation size to the max physically
> contiguously allocation: MAX_ORDER.

This is just to silence the alloc_pages warning, right? If so
how about adding __GFP_NOWARN instead?

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