hw/isa: Allow 8/16/32 bit access on ISA bus after CVE-2020-13754 fix

[RFC PATCH-for-5.1? v3 0/2] hw/isa: Allow 8/16/32 bit access on ISA bus after CVE-2020-13754 fix

Philippe Mathieu-Daudé posted 2 patches 5 years, 3 months ago

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git fetch https://github.com/patchew-project/qemu tags/patchew/20200721123154.5302-1-f4bug@amsat.org

include/exec/memory.h |  7 ++++++-
hw/isa/isa-bus.c      | 14 ++++++++++++++
softmmu/memory.c      | 12 ++++++++----
3 files changed, 28 insertions(+), 5 deletions(-)

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[RFC PATCH-for-5.1? v3 0/2] hw/isa: Allow 8/16/32 bit access on ISA bus after CVE-2020-13754 fix

Posted by Philippe Mathieu-Daudé 5 years, 3 months ago

Surgical attempt to fix the issue, as we are in freeze...

If such kludge is tolerable, it must be reverted first thing
after release.

Fixes:
- https://lore.kernel.org/xen-devel/20200630170913.123646-1-anthony.perard@citrix.com/T/
- https://bugs.debian.org/964793
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964247
- https://bugs.launchpad.net/bugs/1886318

Philippe Mathieu-Daudé (2):
  memory: Allow monkey-patching MemoryRegion access sizes
  hw/isa/isa-bus: Ensure ISA I/O regions are 8/16/32-bit accessible

 include/exec/memory.h |  7 ++++++-
 hw/isa/isa-bus.c      | 14 ++++++++++++++
 softmmu/memory.c      | 12 ++++++++----
 3 files changed, 28 insertions(+), 5 deletions(-)

-- 
2.21.3