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Groups > linux.kernel > #1603604
| From | Andy Lutomirski <luto@amacapital.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel |
| Date | 2017-03-17 21:20 +0100 |
| Message-ID | <tm6vT-3sM-5@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <tm4kr-1GF-49@gated-at.bofh.it> <tm4u5-21N-5@gated-at.bofh.it> <tm4u6-21N-25@gated-at.bofh.it> <tm4Ns-29P-21@gated-at.bofh.it> <tm6vT-3sM-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, Mar 17, 2017 at 12:36 PM, Linus Torvalds <torvalds@linux-foundation.org> wrote: > On Fri, Mar 17, 2017 at 11:20 AM, Andy Lutomirski <luto@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
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Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-17 19:00 +0100
Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-17 19:10 +0100
Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-17 19:10 +0100
Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel Andy Lutomirski <luto@kernel.org> - 2017-03-17 19:30 +0100
Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel Andy Lutomirski <luto@amacapital.net> - 2017-03-17 21:20 +0100
Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-17 22:20 +0100
Re: [x86] 45fc8757d1: BUG:unable_to_handle_kernel Linus Torvalds <torvalds@linux-foundation.org> - 2017-03-17 22:50 +0100
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