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virtiofsd: passthrough_ll: add lo_map for ino/fh indirection
A layer of indirection is needed because passthrough_ll cannot expose pointers or file descriptor numbers to untrusted clients. Malicious clients could send invalid pointers or file descriptors in order to crash or exploit the file system daemon. lo_map provides an integer key->value mapping. This will be used for ino and fh fields in the patches that follow. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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