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Linux disk/nic frontends data leaks

Description

#### ISSUE DESCRIPTION Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742). #### IMPACT An untrusted backend can access data not intended to be shared. If such mappings are made with write permissions the backend could also cause malfunctions and/or crashes to consumers of contiguous data in the shared pages. #### VULNERABLE SYSTEMS All Linux guests using PV devices are vulnerable in case potentially malicious PV device backends are being used.


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