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Validate properties of the strtab that are depended on elsewhere, but were previously unchecked: * String table nonempty (offset 0 is valid) * String table has a leading NUL (offset 0 corresponds to "") * String table is NUL terminated (strfoo functions won't run out of the table while reading). * All symbols names are inbounds of the string table. Signed-off-by: Matthew Maurer <mmaurer@google.com> Reviewed-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>