No, Windows has deny-mode locking at open time, but the kernel's mandatory locks are enforced during read/write (which is why they are such a pain). Samba will not miss these at all. If we want something to provide windows-like semantics, we'd probably want to start with something like Pavel Shilovsky's O_DENY_* patches. -- Jeff On Fri, 2021-08-20 at 12:17 -0700, H. Peter Anvin wrote: > I thought the main user was Samba and/or otherwise providing file service for M$ systems? > > On August 20, 2021 9:30:31 AM PDT, Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > On Thu, Aug 19, 2021 at 12:15:08PM -0700, Linus Torvalds wrote: > > > On Thu, Aug 19, 2021 at 11:39 AM Jeff Layton <jlayton@xxxxxxxxxx> wrote: > > > > > > > > I'm all for ripping it out too. It's an insane interface anyway. > > > > > > > > I've not heard a single complaint about this being turned off in > > > > fedora/rhel or any other distro that has this disabled. > > > > > > I'd love to remove it, we could absolutely test it. The fact that > > > several major distros have it disabled makes me think it's fine. > > > > FWIW, it is now disabled in Ubuntu too: > > > > https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/impish/commit/?h=master-next&id=f3aac5e47789cbeb3177a14d3d2a06575249e14b > > > > > But as always, it would be good to check Android. > > > > It looks like it's enabled (checking the Pixel 4 kernel image), but it's > > not specifically mentioned in any of the build configs that are used to > > construct the image, so I think this is just catching the "default y". I > > expect it'd be fine to turn this off. > > > > I will ask around to see if it's actually used. > > > -- Jeff Layton <jlayton@xxxxxxxxxx>
