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(parent: 9fac18f) | patch
exec: allocate PROT_NONE pages on top of RAM
authorMichael S. Tsirkin <mst@redhat.com>
Thu, 10 Sep 2015 13:41:17 +0000 (16:41 +0300)
committerMichael S. Tsirkin <mst@redhat.com>
Thu, 1 Oct 2015 13:16:52 +0000 (16:16 +0300)
commit8561c9244ddf1122dfe7ccac9b23f506062f1499
tree80ad18ab7472e7cdc9bab615093c29cd92067cdbtree | snapshot
parent9fac18f03a9040b67ec38e14d3e1ed34db9c7e06commit | diff
exec: allocate PROT_NONE pages on top of RAM

This inserts a read and write protected page between RAM and QEMU
memory, for file-backend RAM.
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>
exec.c diff | blob | history
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