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Test against various invariants:
- Every non-root node must have a name
- The root node muts not have a name
- The name must not be ".." or "."
- The name must not contain '/'
- The loop that chases parent pointers must terminate, i.e. we must
never reach the starting state again (link loop).
Furthermore, make sure the sum of all path components plus separators
does not overflow.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If rdsquashfs unpacks a directory tree that contains a symlink,
followed by something else with the exact same name, it will
follow the symlink and can be tricked into writing to an
arbitrary filesystem location controlled by the SquashFS image.
Because there might actually be a reasonable use case, where an
image is unpacked into an directory existing directory tree, with
symlinks that should be followed, this is solved as follows:
- Before unpacking, recursively sort the directory by filename.
- FAIL if (after sorting) two consequtive entries at the same
hierarchy level have the same name.
This solution is more generic and prevents the unpacker from accessing
the same thing twice in generall, thus also excluding the symlink issue.
Hardlinks are already unfolded into duplicate tree nodes by the tree
reader (with loop detection) so that should not prompt further issues.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit rewrites the libtar write paths to use libfstream insead of
a FILE pointer. Also, the libcommon file extraction function is remodeled
to use libfstream.
In accordance, rdsquashfs, sqfs2tar and sqfsdiff have some minor
adjustments made to work with the ported libtar and libcommon.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit adds a --stat option to rdsquashfs that dumps a lot of
information about and inode that tunred out to be usefull in
debugging.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Instead of having the binary programs in randomly named subdirectories,
move all of them to a "bin" subdirectory, similar to the utility
libraries that have subdirectories within "lib" and give the
subdirectories the propper names (e.g. have gensquashfs source in a
directory *actually* named "gensquashfs").
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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