4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chirantan Ekbote <chirantan@xxxxxxxxxxxx> commit d28c756caee6e414d9ba367d0b92da24145af2a8 upstream. The zero-copy optimization when reading or writing large chunks of data is quite useful. However, the 9p messages created through the zero-copy write path have an incorrect message size: it should be the size of the header + size of the data being written but instead it's just the size of the header. This only works if the server ignores the size field of the message and otherwise breaks the framing of the protocol. Fix this by re-writing the message size field with the correct value. Tested by running `dd if=/dev/zero of=out bs=4k count=1` inside a virtio-9p mount. Link: http://lkml.kernel.org/r/20180717003529.114368-1-chirantan@xxxxxxxxxxxx Signed-off-by: Chirantan Ekbote <chirantan@xxxxxxxxxxxx> Reviewed-by: Greg Kurz <groug@xxxxxxxx> Tested-by: Greg Kurz <groug@xxxxxxxx> Cc: Dylan Reid <dgreid@xxxxxxxxxxxx> Cc: Guenter Roeck <groeck@xxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Dominique Martinet <dominique.martinet@xxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/9p/trans_virtio.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -409,6 +409,7 @@ p9_virtio_zc_request(struct p9_client *c p9_debug(P9_DEBUG_TRANS, "virtio request\n"); if (uodata) { + __le32 sz; int n = p9_get_mapped_pages(chan, &out_pages, uodata, outlen, &offs, &need_drop); if (n < 0) @@ -419,6 +420,12 @@ p9_virtio_zc_request(struct p9_client *c memcpy(&req->tc->sdata[req->tc->size - 4], &v, 4); outlen = n; } + /* The size field of the message must include the length of the + * header and the length of the data. We didn't actually know + * the length of the data until this point so add it in now. + */ + sz = cpu_to_le32(req->tc->size + outlen); + memcpy(&req->tc->sdata[0], &sz, sizeof(sz)); } else if (uidata) { int n = p9_get_mapped_pages(chan, &in_pages, uidata, inlen, &offs, &need_drop);
