On Fri, Mar 17, 2017 at 12:36 PM, Linus Torvalds <torva...@linux-foundation.org> wrote: > On Fri, Mar 17, 2017 at 11:20 AM, Andy Lutomirski <l...@kernel.org> wrote: >> >> I can easily imagine that breaking WINE or DOSEMU because it'll affect >> the LDT, too. > > Can they even *read* the LDT contents, though? The whole accessed bit > doesn't show up in 'struct user_desc', so you can neither set it nor > read it.
LAR. I've learned to never underestimate the absurdity of the games played by 16-bit apps. (See, for example, the fact that some of them apparently use SGDT just to find a page that's guaranteed not to be accessible.) > >> How about this: > > I don't think that's _wrong_, but.. > > I'd really rather just do it in fill_ldt() itself, unless you can > explain how it would be visible to anybody.. See above :( (Also, your approach would probably break some selftests.) --Andy
