Previously, we would read the entire padding in a given archive into
memory in order to store it in the packer. This would cause memory
exhaustion if a malicious archive was crafted with very large amounts of
padding. Since a given SegmentType is reconstructed losslessly, we can
simply chunk up any padding into large segments to avoid this problem.
Use a reasonable default of 1MiB to avoid changing the tar-split.json of
existing archives that are not malformed.
Fixes: CVE-2017-14992
Signed-off-by: Aleksa Sarai <asarai@suse.de>
Have a bit-bucket FilePutter, for when it does not matter.
Beginning thoughts on disassembly, but it has things that need thought.
Mostly comments in the function for now.
