* Crashes with KPTI and -rc6
@ 2018-01-03 16:35 Laura Abbott
2018-01-04 6:57 ` Ingo Molnar
0 siblings, 1 reply; 2+ messages in thread
From: Laura Abbott @ 2018-01-03 16:35 UTC (permalink / raw)
To: X86 ML; +Cc: Linux Kernel Mailing List, Linux-MM
Hi,
Fedora got a report via IRC of a double fault with KPTI
https://paste.fedoraproject.org/paste/SL~of04ZExXP6AN2gcJi7A
This is on -rc6 . I saw the one fix posted already which
I'll pull in but I wanted to report this as a heads up
in case there are other issues.
Full tree and configs are at
https://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git/log/?h=rawhide
Thanks,
Laura
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* Re: Crashes with KPTI and -rc6
2018-01-03 16:35 Crashes with KPTI and -rc6 Laura Abbott
@ 2018-01-04 6:57 ` Ingo Molnar
0 siblings, 0 replies; 2+ messages in thread
From: Ingo Molnar @ 2018-01-04 6:57 UTC (permalink / raw)
To: Laura Abbott; +Cc: X86 ML, Linux Kernel Mailing List, Linux-MM, Thomas Gleixner
* Laura Abbott <labbott@redhat.com> wrote:
> Hi,
>
> Fedora got a report via IRC of a double fault with KPTI
> https://paste.fedoraproject.org/paste/SL~of04ZExXP6AN2gcJi7A
I believe this one should be fixed by:
d7732ba55c4b: x86/pti: Switch to kernel CR3 at early in entry_SYSCALL_compat()
> This is on -rc6 . I saw the one fix posted already which
> I'll pull in but I wanted to report this as a heads up
> in case there are other issues.
>
> Full tree and configs are at
> https://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git/log/?h=rawhide
Thanks!
Linus's latest upstream:
00a5ae218d57: Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
and later kernels includes all fixes for all regressions that were reported so far
on top of -rc6:
2fd9c41aea47: x86/process: Define cpu_tss_rw in same section as declaration
d7732ba55c4b: x86/pti: Switch to kernel CR3 at early in entry_SYSCALL_compat()
3ffdeb1a02be: x86/dumpstack: Print registers for first stack frame
a9cdbe72c4e8: x86/dumpstack: Fix partial register dumps
52994c256df3: x86/pti: Make sure the user/kernel PTEs match
694d99d40972: x86/cpu, x86/pti: Do not enable PTI on AMD processors
87faa0d9b43b: x86/pti: Enable PTI by default
PTI fixes can also be independently tracked and pre-merged via:
git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti
Thanks,
Ingo
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