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| author | David Howells <dhowells@redhat.com> | 2023-06-06 15:08:51 +0200 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-06-08 13:42:34 +0200 |
| commit | f9e7a5fa51fbb6fcb9c1c7e2c89dd7df9e7fe253 (patch) | |
| tree | 6d2a6e60bbd02b449b4e2fa68e028e1d1f25a57a /include/crypto | |
| parent | Move netfs_extract_iter_to_sg() to lib/scatterlist.c (diff) | |
| download | linux-f9e7a5fa51fbb6fcb9c1c7e2c89dd7df9e7fe253.tar.xz linux-f9e7a5fa51fbb6fcb9c1c7e2c89dd7df9e7fe253.zip | |
crypto: af_alg: Pin pages rather than ref'ing if appropriate
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@redhat.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
cc: linux-crypto@vger.kernel.org
cc: netdev@vger.kernel.org
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'include/crypto')
| -rw-r--r-- | include/crypto/if_alg.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h index 7e76623f9ec3..46494b33f5bc 100644 --- a/include/crypto/if_alg.h +++ b/include/crypto/if_alg.h @@ -59,6 +59,7 @@ struct af_alg_sgl { struct scatterlist sg[ALG_MAX_PAGES + 1]; struct page *pages[ALG_MAX_PAGES]; unsigned int npages; + bool need_unpin; }; /* TX SGL entry */ |