On Thu, Apr 08, 2021 at 07:11:48PM +0000, Jianmin Wang wrote: > On Mon, Apr 05, 2021 at 16:14 UTC, Greg KH wrote: > > On Mon, Apr 05, 2021 at 01:55:15PM +0000, Jianmin Wang wrote: > > > There is same problem found in linux 4.19.y as upstream commit. The > > > changes of crypto_user_* and cryptouser.h files from upstream patch are > > > merged into > > > crypto/crypto_user.c for backporting. > > > > > > Upstream commit: > > > commit 91b05a7e7d8033a90a64f5fc0e3808db423e420a > > > Author: Ondrej Mosnacek <omosn...@redhat.com> > > > Date: Tue, 9 Jul 2019 13:11:24 +0200 > > > > > > Currently, NETLINK_CRYPTO works only in the init network namespace. It > > > doesn't make much sense to cut it out of the other network namespaces, > > > so do the minor plumbing work necessary to make it work in any network > > > namespace. Code inspired by net/core/sock_diag.c. > > > > > > Signed-off-by: Ondrej Mosnacek <omosn...@redhat.com> > > > Signed-off-by: default avatarHerbert Xu <herb...@gondor.apana.org.au> > > > > > > Signed-off-by: Jianmin Wang <jian...@iscas.ac.cn> > > > --- > > > crypto/crypto_user.c | 37 +++++++++++++++++++++++++------------ > > > include/net/net_namespace.h | 3 +++ > > > 2 files changed, 28 insertions(+), 12 deletions(-) > > > > How does this change fit with the stable kernel rules? It looks to be a > > new feature, if you need this, why not just use a newer kernel version? > > What is preventing you from doing that? > > > > This problem was found when we deployed new services on our container > cluster, > while the new services need to invoke libkcapi in the container environment. > > We have verified that the problem doesn't exist on newer kernel version. > However, due to many services and the cluster running on many server machines > whose host os are long-term linux distribution with linux 4.19 kernel, it > will > cost too much to migrate them to newer os with newer kernel version. This is > why we need to fix the problem on linux 4.19.
But this is not a regression, but rather a "resolve an issue that has never worked for new hardware", right? And for that, moving to a new kernel seems like a wise thing to do to me because we do not like backporting new features. Distro kernel are of course, free to do that if they wish. thanks, greg k-h
