[COMPRESS-513] [Tar] error decoding sparse file header

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.20
• Component/s: Archivers

Environment

1. Ubuntu 19.10.
3. Gnu tar 1.30

• Assignee: Unassigned
• Reporter: Bear R Giles
• Created: 04/May/20 19:28
• Updated: 07/May/20 12:22

Description

I am seeing an IllegalArgumentException when attempting to scan a (gnu) tar file containing a backup of my home directory. The entry is a sqlite database table used by chromium.

The archive file is 62 GB and over 1 million files. ( ! ) (Can you tell I'm a developer?)

The error is:

java.lang.IllegalArgumentException: At offset 0, 12 byte binary number exceeds maximum signed long value
java.lang.IllegalArgumentException: At offset 0, 12 byte binary number exceeds maximum signed long value
   at org.apache.commons.compress.archivers.tar.TarUtils.parseBinaryBigInteger(TarUtils.java:231)

From instrumenting the code I can determine that the TarArchiveEntry reports:

• name: ./snap/chromium/1005/.config/chromium/Default/Storage/ext/jajcoljhdglkjpfefjkgiohbhnkkmipm/def/GPUCache/data_3
• mode: 0600
• size: 53248
• real: 4202496

The (presumed) sparse headers are:

c3 ca 04 c1 00 00 02 00 03 00 00 00  |
00 10 00 00 04 00 00 00 00 04 00 00  |
03 00 00 00 01 00 00 00 00 00 00 00  |
fc 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 73 77 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00  |
00 00 00 00 00 00 00 00 00 00 00 00 

And for this specific entry 

• buffer: c3 ca 04 c1 00 00 02 00 03 00 00 00
• remainder: ca 04 c1 00 00 02 00 03 00 00 00
• neg: false
• value: -65259544571650071836229632

I'll add the full header in a comment later today. It looks likely that the header format isn't properly recognized.