Tested the mksquashfs command in version 4.4 (2019/08/29) on Ubuntu 20.04.
It now says: Not enough or invalid arguments in pseudo file definition "/ f 444
root root echo"
Appending to the archive now reports "File system corrupted: filename
too long" and fails gracefully.
Listing the archive also reports the corruption, and fails earlier with
"FATAL ERROR:dir_scan: failed to read directory squashfs-root"
** Changed in: squashfs-tools (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1745757
Title:
Buffer overflow adding to archive with pseudo file at '/'
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