This release adds Manpages, a fix for CVE-2021-41072 and the usual minor
improvements and bug fixes.
1. Major improvements
1.1 This release adds Manpages for Mksquashfs(1), Unsquashfs(1),
Sqfstar(1) and Sqfscat(1).
1.2 The -help text output from the utilities has been improved
and extended as well (but the Manpages are now more
comprehensive).
1.3 CVE-2021-41072 which is a writing outside of destination
exploit, has been fixed.
2. Minor improvements
2.1 The number of hard-links in the filesystem is now also
displayed by Mksquashfs in the output summary.
2.2 The number of hard-links written by Unsquashfs is now
also displayed in the output summary.
2.3 Unsquashfs will now write to a pre-existing destination
directory, rather than aborting.
2.4 Unsquashfs now allows "." to used as the destination, to
extract to the current directory.
2.5 The Unsquashfs progress bar now tracks empty files and
hardlinks, in addition to data blocks.
2.6 -no-hardlinks option has been implemented for Sqfstar.
2.7 More sanity checking for "corrupted" filesystems, including
checks for multiply linked directories and directory loops.
2.8 Options that may cause filesystems to be unmountable have
been moved into a new "experts" category in the Mksquashfs
help text (and Manpage).
3. Bug fixes
3.1 Maximum cpiostyle filename limited to PATH_MAX. This
prevents attempts to overflow the stack, or cause system
calls to fail with a too long pathname.
3.2 Don't always use "max open file limit" when calculating
length of queues, as a very large file limit can cause
Unsquashfs to abort. Instead use the smaller of max open
file limit and cache size.
3.3 Fix Mksquashfs silently ignoring Pseudo file definitions
when appending.
3.4 Don't abort if no XATTR support has been built in, and
there's XATTRs in the filesystem. This is a regression
introduced in 2019 in Version 4.4.
3.5 Fix duplicate check when the last file block is sparse.