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@xxxxxxxxxx> > cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> > cc: "David S. Miller" <davem@xxxxxxxxxxxxx> > cc: Eric Dumazet <edumazet@xxxxxxxxxx> > cc: Jakub Kicinski <kuba@xxxxxxxxxx> > cc: Paolo Abeni <pabeni@xxxxxxxxxx> > cc: Jens Axboe <axboe@xxxxxxxxx> > cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> > cc: linux-crypto@xxxxxxxxxxxxxxx > cc: netdev@xxxxxxxxxxxxxxx > --- > crypto/af_alg.c | 10 +++++++--- > include/crypto/if_alg.h | 1 + > 2 files changed, 8 insertions(+), 3 deletions(-) Acked-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
