Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1529582
| From | Andy Lutomirski <luto@amacapital.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? |
| Date | 2016-11-24 18:20 +0100 |
| Message-ID | <sH5QJ-5Hs-9@gated-at.bofh.it> (permalink) |
| References | (2 earlier) <sFpTA-4UY-5@gated-at.bofh.it> <sFRd8-6zi-15@gated-at.bofh.it> <sG1ct-4DY-3@gated-at.bofh.it> <sG1Fw-4P0-9@gated-at.bofh.it> <sG4k1-6wK-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Nov 21, 2016 at 1:21 PM, Linus Torvalds <torvalds@linux-foundation.org> wrote: > On Mon, Nov 21, 2016 at 10:26 AM, H. Peter Anvin <hpa@zytor.com> wrote: >> On 11/21/16 10:00, Linus Torvalds wrote: >>> >>> I'd much rather we go back to just making the "cs" entry explicitly >>> 16-bit, and have a separate padding entry, the way we used to long >>> long ago. >>> >> >> I would agree 100% with this. > > We _used_ to do it like this in some places (signal stack, other places): > > unsigned short cs, __csh; I'm testing a patch to do exactly this. I didn't bother with the fancy anonymous union stuff because I don't see any great reason that anything needs to write the high bits. Amusingly, grsecurity seems to contain a fix for one instance of this bug on x86_32 and one instance on x86_64 (!). --Andy
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Andy Lutomirski <luto@kernel.org> - 2016-11-20 03:00 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Brian Gerst <brgerst@gmail.com> - 2016-11-20 03:20 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Andy Lutomirski <luto@amacapital.net> - 2016-11-20 03:20 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Ingo Molnar <mingo@kernel.org> - 2016-11-21 08:30 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-21 19:10 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? "H. Peter Anvin" <hpa@zytor.com> - 2016-11-21 19:40 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-21 22:30 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-21 23:30 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? hpa@zytor.com - 2016-11-21 23:30 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Andy Lutomirski <luto@amacapital.net> - 2016-11-24 18:20 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Ingo Molnar <mingo@kernel.org> - 2016-11-22 09:40 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Andy Lutomirski <luto@amacapital.net> - 2016-11-22 18:40 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Ingo Molnar <mingo@kernel.org> - 2016-11-23 10:00 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? hpa@zytor.com - 2016-11-21 07:00 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? "H. Peter Anvin" <hpa@zytor.com> - 2016-11-21 17:10 +0100
Re: What exactly do 32-bit x86 exceptions push on the stack in the CS slot? Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-21 19:30 +0100
csiph-web