mbox series

[v2,0/5] x86/kasan: Bug fixes for recent CEA changes

Message ID 20221110203504.1985010-1-seanjc@google.com
Headers
Series x86/kasan: Bug fixes for recent CEA changes |

Message

Sean Christopherson Nov. 10, 2022, 8:34 p.m. UTC 
  Three fixes for the recent changes to how KASAN populates shadows for
the per-CPU portion of the CPU entry areas.  The v1 versions were posted
independently as I kept root causing issues after posting individual fixes.

v2:
  - Map the entire per-CPU area in one shot. [Andrey]
  - Use the "early", i.e. read-only, variant to populate the shadow for
    the shared portion (read-only IDT mapping) of the CEA. [Andrey]

v1:
  - https://lore.kernel.org/all/20221104212433.1339826-1-seanjc@google.com
  - https://lore.kernel.org/all/20221104220053.1702977-1-seanjc@google.com
  - https://lore.kernel.org/all/20221104183247.834988-1-seanjc@google.com

Sean Christopherson (5):
  x86/mm: Recompute physical address for every page of per-CPU CEA
    mapping
  x86/mm: Populate KASAN shadow for entire per-CPU range of CPU entry
    area
  x86/kasan: Rename local CPU_ENTRY_AREA variables to shorten names
  x86/kasan: Add helpers to align shadow addresses up and down
  x86/kasan: Populate shadow for shared chunk of the CPU entry area

 arch/x86/mm/cpu_entry_area.c | 10 +++-----
 arch/x86/mm/kasan_init_64.c  | 50 +++++++++++++++++++++++-------------
 2 files changed, 36 insertions(+), 24 deletions(-)


base-commit: 0008712a508f72242d185142cfdbd0646a661a18

Comments

Peter Zijlstra Nov. 14, 2022, 11:57 a.m. UTC | #1 
On Thu, Nov 10, 2022 at 08:34:59PM +0000, Sean Christopherson wrote:
> Three fixes for the recent changes to how KASAN populates shadows for
> the per-CPU portion of the CPU entry areas.  The v1 versions were posted
> independently as I kept root causing issues after posting individual fixes.
> 
> v2:
>   - Map the entire per-CPU area in one shot. [Andrey]
>   - Use the "early", i.e. read-only, variant to populate the shadow for
>     the shared portion (read-only IDT mapping) of the CEA. [Andrey]
> 
> v1:
>   - https://lore.kernel.org/all/20221104212433.1339826-1-seanjc@google.com
>   - https://lore.kernel.org/all/20221104220053.1702977-1-seanjc@google.com
>   - https://lore.kernel.org/all/20221104183247.834988-1-seanjc@google.com
> 
> Sean Christopherson (5):
>   x86/mm: Recompute physical address for every page of per-CPU CEA
>     mapping
>   x86/mm: Populate KASAN shadow for entire per-CPU range of CPU entry
>     area
>   x86/kasan: Rename local CPU_ENTRY_AREA variables to shorten names
>   x86/kasan: Add helpers to align shadow addresses up and down
>   x86/kasan: Populate shadow for shared chunk of the CPU entry area
> 
>  arch/x86/mm/cpu_entry_area.c | 10 +++-----
>  arch/x86/mm/kasan_init_64.c  | 50 +++++++++++++++++++++++-------------
>  2 files changed, 36 insertions(+), 24 deletions(-)

Thanks for cleaning up that mess!