When starting mount or umount, the environment was not cleared and
could be used for privilege escalation (CVE-2015-3202).
This is a port of the fix to full fuse by using execle(3) instead
of execl(3)
Compressed records may be written as full clusters even though cluster
tails are meaningless. This is to avoid the lower levels doing a read-
modify-write cycle. Be sure to zero the meaningless bytes to avoid
leaking information.
Contributed by Eric Biggers
On OpenIndiana 64-bits, st_rdev has major and minor as 32-bits wide each,
but the fuse protocol (common to 32-bit and 64-bit) has an st_rdev field
limited to 32-bit. For now, pack major and minor the same way as in the
32-bit variant (14 and 18 bits).
When the owner and the group of a file have the same SID, and permissions
for the group is the same as permissions for other, no ACE is needed for
the group.
Newer versions of Windows use more recent definitions of upper-case
table defined by the Unicode consortium. Now using the same table as
Windows 7, windows 8 and Windows 10. This only has an effect on file
systems newly created by mkntfs.
Unused entries in the MFT may have a bad length leading to fetch fixups
from unallocated memory. Check the condition, but do not wipe, leave it
to chkdsk to decide what should be fixed.
An unused MFT record may show a bad length, leading to fetch fixups from
unallocated memory when allocating the record to a new file. So check
the length before applying the fixups. Such records have been found after
the MFT has been reallocated by a defragmenter, and they are not cleaned
by chkdsk.
When chmod'ing a file, no new ACL has to be created if the one needed
is already present in the cache. However the read-only flag may have
to be updated, so that it is kept as the opposite of S_IWUSR.
When the unmounting of the partition fails after running ntfsfix, a
second try was attempted. This cannot be done and leads to more errors
because some essential records have been freed, so better quit without
making a second try.
fuse-lite announces a FUSE_VERSION which may not always match the exact
capabilities of the library. Hence we add a special case for 'ioctl',
which we know exists in fuse-lite regardless of the version number
published.
The capability actually appeared in FUSE 2.9, not 2.8. However in order
to maintain similarity to earlier #ifdef:s, we simpy check if
FUSE_CAP_IOCTL_DIR is defined rather than checking the FUSE version.
The variable 'res' was never initialized if the #ifdef condition
'!KERNELPERMS | (POSIXACLS & !KERNELACLS)' evaluated to true and there
was an error allocating memory for 'value'.
autofs passes the sloppy option to mount(8) for all file systems to mean
that mount should not choke on invalid options such as those meant for
remote mounting on another operating system through nfs or cifs.
Following a recent change, mount(8) passes the -s option on to any file
system, even to local ones (which are not expected to get foreign options),
so ntfs-3g now has to ignore -s.
The support for ioctls has been added to fuse when using protocol 7.18,
and an equivalent upgrade has been done in fuse lite with commit [ae9aee].
For old kernels, a fall back to protocol 7.8 was implemented, but this
appears not to be supported in not-so-old kernels (e.g. 2.6.35).
With this patch, the fall back protocol is set to 7.12 or to the highest
level supported by the kernel.
When the security attribute is present, chkdsk may set a null security id
in the standard attributes, and this should not be considered as an error.
(this partially reverts commit [70e5b1])
When the new option --unused-fast is used, clusters which appear as wiped
are not written again. This is useful for avoiding virtual partitions to
be extended to their full size.
Contributed by michael
This patch changes the algorithm to use hash chains instead of binary
trees, with much stronger hashing. It also introduces useful (for
performance) parameters, such as the "nice match length" and "maximum
search depth", that are similar to those used in other commonly used
compression algorithms such as zlib's DEFLATE implementation.
The speed improvement is very significant, with some loss of compression
rate. The compression rate is still better than then Windows one.
Contributed by Eric Biggers
The new way goes via /sys/dev/block/MAJOR:MINOR to map partitions to
devices and get discard parameters of the parent device. It also ensures
that the partition is aligned to the discard block size.
Contributed by Richard W.M. Jones
fstrim(8) discards unused blocks on a mounted filesystem. It is useful for
solid-state drives (SSDs) and thinly-provisioned storage.
Only trimming the full device (with no option) is supported.
Contributed by Richard W.M. Jones
This is backporting code from the full FUSE library in order to support
ioctls. The fuse protocol level negociated is now 7.18 instead of 7.8.
A fallback protocol to 7.8 is provided for compatibility with older kernels.
32-bit ioctls are not supported by a 64-bit library
Jean-Pierre André
Erik Larsson
Jean-Pierre André