linux-kernel - Re: [PATCH net-next v3 05/10] crypto: af_alg: Pin pages rather than ref'ing if appropriate

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Message-ID: <ZIBChFDNAIstvS6l@gondor.apana.org.au>
Date:   Wed, 7 Jun 2023 16:40:36 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     David Howells <dhowells@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, linux-crypto@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 05/10] crypto: af_alg: Pin pages rather than
 ref'ing if appropriate

On Tue, Jun 06, 2023 at 02:08:51PM +0100, David Howells wrote:
> Convert AF_ALG to use iov_iter_extract_pages() instead of
> iov_iter_get_pages().  This will pin pages or leave them unaltered rather
> than getting a ref on them as appropriate to the iterator.
> 
> The pages need to be pinned for DIO-read rather than having refs taken on
> them to prevent VM copy-on-write from malfunctioning during a concurrent
> fork() (the result of the I/O would otherwise end up only visible to the
> child process and not the parent).
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Herbert Xu <herbert@...dor.apana.org.au>
> cc: "David S. Miller" <davem@...emloft.net>
> cc: Eric Dumazet <edumazet@...gle.com>
> cc: Jakub Kicinski <kuba@...nel.org>
> cc: Paolo Abeni <pabeni@...hat.com>
> cc: Jens Axboe <axboe@...nel.dk>
> cc: Matthew Wilcox <willy@...radead.org>
> cc: linux-crypto@...r.kernel.org
> cc: netdev@...r.kernel.org
> ---
>  crypto/af_alg.c         | 10 +++++++---
>  include/crypto/if_alg.h |  1 +
>  2 files changed, 8 insertions(+), 3 deletions(-)

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
-- 
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