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Groups > linux.kernel > #1441629
| From | Dave Hansen <dave.hansen@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [kernel-hardening] [PATCH v5 13/32] x86/mm/64: In vmalloc_fault(), use CR3 instead of current->active_mm |
| Date | 2016-07-12 20:00 +0200 |
| Message-ID | <rUa8q-8da-21@gated-at.bofh.it> (permalink) |
| References | <rTQt3-3Fx-3@gated-at.bofh.it> <rTQt4-3Fx-31@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 07/11/2016 01:53 PM, Andy Lutomirski wrote: > If we get a vmalloc fault while current->active_mm->pgd doesn't > match CR3, we'll crash without this change. I've seen this failure > mode on heavily instrumented kernels with virtually mapped stacks. When does this happen, btw? Crossing page boundaries on the stack between the time we swap mm's and the time we switch stacks?
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[PATCH v5 13/32] x86/mm/64: In vmalloc_fault(), use CR3 instead of current->active_mm Andy Lutomirski <luto@kernel.org> - 2016-07-11 23:00 +0200
Re: [kernel-hardening] [PATCH v5 13/32] x86/mm/64: In vmalloc_fault(), use CR3 instead of current->active_mm Dave Hansen <dave.hansen@intel.com> - 2016-07-12 20:00 +0200
Re: [kernel-hardening] [PATCH v5 13/32] x86/mm/64: In vmalloc_fault(), use CR3 instead of current->active_mm Andy Lutomirski <luto@amacapital.net> - 2016-07-12 20:10 +0200
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