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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Use the same size check as sqfs_dir_reader_open_dir and report EOF,
even if it is possible to read the header itself, but nothing beyond
that.
Also check if it should be possible to read an entry header before
attempting and report EOF if not.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The sqfs_dir_reader_open_dir function tried to take a short-cut by
returning early if the target directory is empty. However, this left
some field unchanged from the previous directory.
If iterating over a directory and then deciding to enter a sub-directory
that happens to be empty, the directory reader will keep the settings
for the current directory. After calling sqfs_dir_reader_rewind, the
sub-directory will suddenly report the contents of the parent.
A similar check is added to the rewind function to not track back on
the meta data reader in that case.
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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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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Gets a little difficult to debug otherwise.
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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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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The squashfs readdir() implementation in the Linux kernel returns
non-existing "." and ".." entries for offsets 0 and 1, and after
that reads from disk. For convenience, it was decided to store an
off-by-3 value on disk instead of doing complex primary school math
to adjust for this. This didn't show up until now, because the kernel
implementation trusts the value from the directory header more than
the actual size in the inode and happily reads 3 more than the inode
would allow it to. This only showed up with 7-zip which subtracts 3
from the size and expects the result to be exact and bails if the
directory headers suggest otherwise.
And yes, I did consider making a "Holy Hand Granade of Antioch"
reference, but consciously decided not to.
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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When processing files > 4G, using "%o" truncates the result and the
tarball is not readable. This should have been discovered when
auto-patching the printf format specifiers, but a cast was added
instead and the issue was overlooked.
This commit replaces the down-cast and printf format specifiers.
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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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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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The same problem with the meta data header again, 16 bit read from
a buffer: copy the buffer data into a 16 bit variable instead of
casting to something potentially unaligned.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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When accessing the 16 bit header, don't cast the buffer pointer to an
uint16_t pointer, the result might not be aligned propperly. Instead
memcpy to and from an uint16_t.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If the hard link counter or the inode number counter overflow the
maximum representable value (for SquashFS 16 bit and 32 bit
respecitively), abort with an error message.
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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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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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If SQFS_STATIC is defined, dummy out the SQFS_API definition, so we
don't try to pull stuff from a (in this case) non-existant DLL or
try to export functions.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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On systems like Windows, the dynamic library and applications can
easily end up being linked against different runtime libraries, so
applications cannot be expected to be able to free() any malloc'd
pointer that the library returns.
This commit adds an sqfs_free function so the application can pass
pointers back to the library to call the correct free() implementation.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Currently, when the block processor aggreagtes fragments into a
fragment block, it applies the "don't compress" flag if any of the
original framgnets has it set, but the "align to device block" flag
is lost.
This commit ensures that both flags get applied to the fragment block
if set.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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1) If the block alignment flag is set, the padding bytes must be
inserted _before_ recording the start position, otherwise the
resulting image is not readable.
2) Also perform alignment if the flag is set on a fragment block.
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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The changes from commit 5191a25b92f903bcc2142be7ea1bfbe5ea1f5096
are backported here in a separate commit since master had some
restructuring of libcommon.a after version 1.0.2 and the commit
cannot be rebased directly.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit is an amalgamation of the commits on master that
implement exact matching of fragment blocks during deduplication.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Instead of comparing (compresed, disk-size, checksum) tuples to find
block matches, do an exact, byte-for-byte comparison of the data
stored on disk to avoid the possibility of a spurious colision.
Since this is the desired behaviour, make it the default, optionally
overrideable through a flag.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Keeping a list of fragments stored away in the current fragment block
and consolidating them in the thread pool takes them out of circulation.
If we have a lot of tiny fragments, this can lead to a situation where
all the limit is reached, but we cannot do anything, because we are
waiting for a block to complete, but they are all attached to the
current fragment block and the queue is empty.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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It looks like the last commit missed a couple more occurences
where '\' was treated incorrectly.
Fixes were still needed in sqfs_dir_reader_find_by_path and
sqfs_dir_reader_get_full_hierarchy.
This path is used in extras/browse.c.
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All paths were canonicalized internally, which includes filtering
sequences of slashes and converting backslashes to slashes.
Furthermore, when unpacking files, filenames are sanity checked
and rejected if they contain forward OR backward slashes.
This is a problem on Unix-like systems, where files containing
backslashes are a legitimate use case (*cough* SystemD *cough*).
This patch removes the backslash conversion from the canonicalization
and modifies the sanity check to reject backslashes only on Windows.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Instead of dereferencing the NULL pointer and crashing.
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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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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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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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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In addition to skipping non-prefixed files and stripping the prefix
off of entries we accept, the targets of links also have to be altered,
since they can be absolute paths with the root prefix attached.
This can affect symbolic links as well. Altough they are allowed to
point into nowhere, across filesystem boundaries, they may also be
absolute paths refering to existing locations in the filesystem, so
no distinction is made by default.
However, the later may be intended (e.g. only a subdirectory is packed
into SquashFS and then mounted at that location), so a command line
switch is added to disable symlink retargetting.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If rdsquashfs describes a filesystem, is configured to use a prefix-path
and a file contains a space, the resulting input path has the prefix
printed as is and the rest of the string in quotation marks.
gensquashfs simply takes the entire rest of the line as is as its
input path and no longer finds the file.
Fix this by omitting the escapes and quotation marks for the
input path.
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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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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- Make sure the file actually has that many records before trying
to read one and fail if not.
- Use the helper macros for size_t overflow checking instead of
assuming size_t == uint64_t.
- Impose a "reasonable" upper bound on the number of data segments
and insist that there is at least one entry.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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