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2019-08-23Check against format limits in meta_reader_read_dir_headerDavid Oberhollenzer
The SquashFS kernel implementation insists that a directory header is followed by no more than an upper bound of entries, way less than what the filed itself actually supports. This commit makes sure that the meta_reader_read_dir_header function also enforces that same limit. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Size accounting + alloc() overflow checking, round #2David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Do bounds checking in metadata readerDavid Oberhollenzer
In all cases where metadata blocks are read, we can roughly (in some cases even preciesly) say in what range those metadata blocks will be, so it makes sense to throw an error if an attempt is made to wander outside this range. Furthermore, when reading from an uncompressed block, it is more reasonable to check against the actual block bounds than to padd it with 0 bytes. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Some simple search/replace cases for allocationDavid Oberhollenzer
This commit exchanges some malloc(x + y * z) patterns that can be found with a simple git grep and are obvious for the new wrappers. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Add wrappers for calloc style functions with size overflow checkingDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-23Add primitives for unsigned addition/multiplication with overflowDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-22deserialize_tree: filter out directory loopsDavid Oberhollenzer
The tree deserializer does a recursive depth-first search to populate the directory tree, moving back and forth between the directory listing containing the inode references and the inode table pointing to the list of child inodes. It is completely unaware of hard links and creates duplicate nodes instead. It is possible to create a malicious SquashFS image that contains a directory that contains as child a reference to its own inode. This can also be done transitively (i.e. directory contains its own parent or grand parent), leading to infinite recursion (actually finite, since it terminates once all stack memory is exhausted). This commit adds a simple check to see if a node has the same inode number as any of its would-be parents. If it does, the node is discarded and a warning message is emitted. Other cases with arbitrary layers of indirection could be constructed as well (e.g. dir 'a' contains hard link to 'b' and 'b' one back to 'a'), but the sub hierarchies are always expanded, this check should catch that too. Reported-by: Zachary Dremann <dremann@gmail.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-22Fix uint64_t printf for compatility with 32 bit systemsv0.6David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-22Fix resource leak in compare_dir_entries error pathDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Bump version number for next releaseDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Fix "no attributes" sentinel value for xattr readerDavid Oberhollenzer
An inode can be of extended type for reasons other than having extended attributes and simply set the xattr ID to 0xFFFFFFFF to indicate that it doesn't have extended attributes. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Update man pagesDavid Oberhollenzer
- Add "see also" references - Make some adjustments as suggested by man-pages(7) - Clarify environment variable behaviour Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Update sqfsdiff documentationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Fix timestamp comparison for directory sourceDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Also extract files in sqfsdiff that only exist in one of the two sourcesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Fix usage of EXIT_* constants in sqfsdiffDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Use "old" and "new" prefix when extracting files in sqfsdiffDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Make unified dir to sqfs comparison workDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Isolate sqfsdiff global state and split off option processingDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Rename difftool.h to sqfsdiff.hDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Consistently use old/new nomenclature in sqfsdiffDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Cleanup difftool dir entry comparionDavid Oberhollenzer
- Replace a/b nomenclature with old/new - Remove special case handling that isn't needed Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-21Merge functionality of file on disk and file in sqfs compare functionsDavid Oberhollenzer
Moving towards unified sqfs vs sqfs, sqfs vs dir, dir vs sqfs comparisions. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-20Change CLI of sqfsdiff to specify images through long optionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-20Remove fscompare programDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-20Add explicit padding to tree_node_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-20Add simple test case for block processor orderingDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Fix packer statisticsDavid Oberhollenzer
Needs regenerating of the file list that was ripped up and rearranged during file packing. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Fix file list generation: break any pre-existing connectionDavid Oberhollenzer
If the linked list pointer was already used before, break up the connection so we don't risk running into a loop or something when regenerating the list. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Make using pthread optionalDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Fix chmod of symlinks in restore_fstreeDavid Oberhollenzer
We can't change the mod of symlinks and hence AT_SYMLINK_NOFOLLOW is not supported by chmod(2 -> RTFM!). The solution is to not use that flag and simply skip symlinks. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Fix directory traversal in update_tree_attribsDavid Oberhollenzer
Do not try to change the nameless root node which is mapped to the output directory. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Update rdsquashfs man pageDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Add rdsquashfs flag to restore file timestampsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Minor improvements for parallel block processorDavid Oberhollenzer
- Fewer lock aquires in worker function - There is no point in locking/unlocking for inserting the completed block if we are going to lock again immediately in the next iteration -> Merge those two critical sections into one - Constant time queue insertion - Bypass queue entirely if there is nothing to do for a block Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Fix memory leak in data writer fragment deduplicationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Fix memory leak in data writer error code pathsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-19Fix memory leak in dir-scan error code pathDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-18Replace update_crc32 helper function with crc32 from zlibDavid Oberhollenzer
It is optimized to the maximum and if we already use zlib anyway, why not use zlib crc32? This also makes zlib a hard dependency which also means the whole "do we have a compressor" sanity check in the build system can be removed. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-18Make data writer use block processorDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-18Restructure data writer around passing block_t structuresDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-18Minor interface change to data writerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-18cleanup: internalize deduplication list in data_writerDavid Oberhollenzer
This change removes the need for passing a list of files around for deduplication. Also the deduplication code no longer needs to worry about order, since the file being deduplicated is only added after deduplication is done. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-18Add pthread based, parallel block processor implementationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-18Add block processor data structureDavid Oberhollenzer
The interface is designed for parallel, asynchronuous processing of data blocks with an I/O callback that handles the serialized result. The underlying implementation is currently still synchronuous. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-16Add deep-copy function to compressor interfaceDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-16Import ax_pthread.m4David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-16Fix: don't try to read xattrs if there are noneDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-12Fix name prefix of ax_compile_check_sizeof.m4David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-08-11cleanup: zero-initialize gensquashfs options with memsetDavid Oberhollenzer
Manual initialization is not only verbose, it actually caused a bug in a past version. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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