tree 0a2b3aef43106edfbf64a788d07d69874ff64bda
parent c2dfc5ba3fb3a1b7278c99bfd3bf350202169434
author Michael S. Tsirkin <mst@redhat.com> 1441892477 +0300
committer Michael S. Tsirkin <mst@redhat.com> 1443705412 +0300

oslib: allocate PROT_NONE pages on top of RAM

This inserts a read and write protected page between RAM and QEMU
memory. This makes it harder to exploit QEMU bugs resulting from buffer
overflows in devices using variants of cpu_physical_memory_map,
dma_memory_map etc.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>