linux-kernel - Re: [PATCH] hwrng: core - fix task hung in hwrng

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Message-ID: <ZWnGV39HJr9uUB2/@gondor.apana.org.au>
Date:   Fri, 1 Dec 2023 19:41:11 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Edward Adam Davis <eadavis@...com>
Cc:     davem@...emloft.net, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, olivia@...enic.com,
        syzbot+c52ab18308964d248092@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] hwrng: core - fix task hung in hwrng_fillfn

On Fri, Dec 01, 2023 at 07:37:39PM +0800, Edward Adam Davis wrote:
>
> Reduce the scope of critical zone protection.
> The original critical zone contains a too large range, especially like 
> copy_to_user() should not be included in the critical zone.

Which part in particular is taking 143 seconds? The buffer is
only 128 bytes long.  Why is a 128-byte copy taking 143 seconds,
even with a page fault?

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