staging: android: ashmem: Disallow ashmem memory from being remapped
When ashmem file is being mmapped the resulting vma->vm_file points to the
backing shmem file with the generic fops that do not check ashmem
permissions like fops of ashmem do. Fix that by disallowing mapping
operation for backing shmem file.
Bug: 142938932
Bug: 142903466
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I718dfca02c83845f8a41d88506871b0aa21326d7
CVE-2020-0009
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
1 file changed