Commit Graph

6 Commits

Author SHA1 Message Date
Andreas Gruenbacher d9a82a0403 xattr handlers: Pass handler to operations instead of flags
The xattr_handler operations are currently all passed a file system
specific flags value which the operations can use to disambiguate between
different handlers; some file systems use that to distinguish the xattr
namespace, for example.  In some oprations, it would be useful to also have
access to the handler prefix.  To allow that, pass a pointer to the handler
to operations instead of the flags value alone.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-11-13 20:34:32 -05:00
Andreas Gruenbacher e282fb7f3b hfsplus: Remove unused xattr handler list operations
The list operations can never be called; they are even documented to be
unused.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-11-13 20:34:29 -05:00
Fabian Frederick 5e61473ea9 fs/hfsplus: move xattr_name allocation in hfsplus_setxattr()
security/trusted/user/osx setxattr did the same
xattr_name initialization. Move that operation in hfsplus_setxattr().

Tested with security/trusted/user getfattr/setfattr

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-17 09:04:05 -04:00
Fabian Frederick a3cef4cd68 fs/hfsplus: move xattr_name allocation in hfsplus_getxattr()
security/trusted/user/osx getxattr did the same
xattr_name initialization. Move that operation in hfsplus_getxattr().

Tested with security/trusted/user getfattr/setfattr

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-17 09:04:04 -04:00
Hin-Tak Leung bf29e886b2 hfsplus: correct usage of HFSPLUS_ATTR_MAX_STRLEN for non-English attributes
HFSPLUS_ATTR_MAX_STRLEN (=127) is the limit of attribute names for the
number of unicode character (UTF-16BE) storable in the HFS+ file system.
Almost all the current usage of it is wrong, in relation to NLS to
on-disk conversion.

Except for one use calling hfsplus_asc2uni (which should stay the same)
and its uses in calling hfsplus_uni2asc (which was corrected in the
earlier patch in this series concerning usage of hfsplus_uni2asc), all
the other uses are of the forms:

- char buffer[size]

- bound check: "if (namespace_adjusted_input_length > size) return failure;"

Conversion between on-disk unicode representation and NLS char strings
(in whichever direction) always needs to accommodate the worst-case NLS
conversion, so all char buffers of that size need to have a
NLS_MAX_CHARSET_SIZE x .

The bound checks are all wrong, since they compare nls_length derived
from strlen() to a unicode length limit.

It turns out that all the bound-checks do is to protect
hfsplus_asc2uni(), which can fail if the input is too large.

There is only one usage of it as far as attributes are concerned, in
hfsplus_attr_build_key().  It is in turn used by hfsplus_find_attr(),
hfsplus_create_attr(), hfsplus_delete_attr().  Thus making sure that
errors from hfsplus_asc2uni() is caught in hfsplus_attr_build_key() and
propagated is sufficient to replace all the bound checks.

Unpropagated errors from hfsplus_asc2uni() in the file catalog code was
addressed recently in an independent patch "hfsplus: fix longname
handling" by Sougata Santra.

Before this patch, trying to set a 55 CJK character (in a UTF-8 locale,
> 127/3=42) attribute plus user prefix fails with:

    $ setfattr -n user.`cat testing-string` -v `cat testing-string` \
        testing-string
    setfattr: testing-string: Operation not supported

and retrieving a stored long attributes is particular ugly(!):

    find /mnt/* -type f -exec getfattr -d {} \;
    getfattr: /mnt/testing-string: Input/output error

with console log:
    [268008.389781] hfsplus: unicode conversion failed

After the patch, both of the above works.

FYI, the test attribute string is prepared with:

echo -e -n \
"\xe9\x80\x99\xe6\x98\xaf\xe4\xb8\x80\xe5\x80\x8b\xe9\x9d\x9e\xe5" \
"\xb8\xb8\xe6\xbc\xab\xe9\x95\xb7\xe8\x80\x8c\xe6\xa5\xb5\xe5\x85" \
"\xb6\xe4\xb9\x8f\xe5\x91\xb3\xe5\x92\x8c\xe7\x9b\xb8\xe7\x95\xb6" \
"\xe7\x84\xa1\xe8\xb6\xa3\xe3\x80\x81\xe4\xbb\xa5\xe5\x8f\x8a\xe7" \
"\x84\xa1\xe7\x94\xa8\xe7\x9a\x84\xe3\x80\x81\xe5\x86\x8d\xe5\x8a" \
"\xa0\xe4\xb8\x8a\xe6\xaf\xab\xe7\x84\xa1\xe6\x84\x8f\xe7\xbe\xa9" \
"\xe7\x9a\x84\xe6\x93\xb4\xe5\xb1\x95\xe5\xb1\xac\xe6\x80\xa7\xef" \
"\xbc\x8c\xe8\x80\x8c\xe5\x85\xb6\xe5\x94\xaf\xe4\xb8\x80\xe5\x89" \
"\xb5\xe5\xbb\xba\xe7\x9b\xae\xe7\x9a\x84\xe5\x83\x85\xe6\x98\xaf" \
"\xe7\x82\xba\xe4\xba\x86\xe6\xb8\xac\xe8\xa9\xa6\xe4\xbd\x9c\xe7" \
"\x94\xa8\xe3\x80\x82" | tr -d ' '

(= "pointlessly long attribute for testing", elaborate Chinese in
UTF-8 enoding).

However, it is not possible to set double the size (110 + 5 is still
under 127) in a UTF-8 locale:

    $setfattr -n user.`cat testing-string testing-string` -v \
        `cat testing-string testing-string` testing-string
    setfattr: testing-string: Numerical result out of range

110 CJK char in UTF-8 is 330 bytes - the generic get/set attribute
system call code in linux/fs/xattr.c imposes a 255 byte limit.  One can
use a combination of iconv to encode content, changing terminal locale
for viewing, and an nls=cp932/cp936/cp949/cp950 mount option to fully
use 127-unicode attribute in a double-byte locale.

Also, as an additional information, it is possible to (mis-)use unicode
half-width/full-width forms (U+FFxx) to write attributes which looks
like english but not actually ascii.

Thanks Anton Altaparmakov for reviewing the earlier ideas behind this
change.

[akpm@linux-foundation.org: fix build]
[akpm@linux-foundation.org: fix build]
Signed-off-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Cc: Anton Altaparmakov <anton@tuxera.com>
Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Sougata Santra <sougata@tuxera.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-06 16:08:09 -07:00
Vyacheslav Dubeyko 127e5f5ae5 hfsplus: rework functionality of getting, setting and deleting of extended attributes
Rework functionality of getting, setting and deleting of extended attributes.

Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Reported-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-27 19:10:10 -08:00