Follow-up Comment #1, bug #15329 (project hurd):
The function vm_write() in load_section() requires that the data contents be
in page-aligned memory, but zipdata is allocated by open_memstream() which
does not allocate page-aligned memory. In check_{gzip(),bzip2()}, we need to
allocate page-aligned memory space with valloc(), memcpy zipdata into it and
then point e->file_data to that.
For some reason, exec requires that e->map_buffer has the data mmap'd, even
when we have the data in e->file_data. It will not work if we do not set
this.
All this needs to be done after the finish() call in check_{gzip(),bzip2()}
or they data in e->file_data and e->map_buffer will be freed.
Also, in finish() we need to set e->file_data = NULL after free()ing the data
so that we do not attempt to free it again on a subsequent call to finish().
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