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>

5 files changed, 94 insertions, 66 deletions

diff --git a/fs/hfsplus/attributes.c b/fs/hfsplus/attributes.c
index caf89a7be0a1..f3345c0b1c62 100644
--- a/fs/hfsplus/attributes.c
+++ b/fs/hfsplus/attributes.c
@@ -54,14 +54,11 @@ int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key,
         memset(key, 0, sizeof(struct hfsplus_attr_key));
         key->attr.cnid = cpu_to_be32(cnid);
         if (name) {
-                len = strlen(name);
-                if (len > HFSPLUS_ATTR_MAX_STRLEN) {
-                        pr_err("invalid xattr name's length\n");
-                        return -EINVAL;
-                }
-                hfsplus_asc2uni(sb,
+                int res = hfsplus_asc2uni(sb,
                                 (struct hfsplus_unistr *)&key->attr.key_name,
-                                HFSPLUS_ATTR_MAX_STRLEN, name, len);
+                                HFSPLUS_ATTR_MAX_STRLEN, name, strlen(name));
+                if (res)
+                        return res;
                 len = be16_to_cpu(key->attr.key_name.length);
         } else {
                 key->attr.key_name.length = 0;
diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index e2b3c9ea1c71..c03c94611cce 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -806,47 +806,55 @@ end_removexattr:
 static int hfsplus_osx_getxattr(struct dentry *dentry, const char *name,
                                         void *buffer, size_t size, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
-                                XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
         /*
          * Don't allow retrieving properly prefixed attributes
          * by prepending them with "osx."
          */
         if (is_known_namespace(name))
                 return -EOPNOTSUPP;
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN
+                + XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
+        strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
+        strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);
 
-        return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        res = hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        kfree(xattr_name);
+        return res;
 }
 
 static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name,
                 const void *buffer, size_t size, int flags, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
-                                XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
         /*
          * Don't allow setting properly prefixed attributes
          * by prepending them with "osx."
          */
         if (is_known_namespace(name))
                 return -EOPNOTSUPP;
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN
+                + XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
+        strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
+        strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);
 
-        return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        res = hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        kfree(xattr_name);
+        return res;
 }
 
 static size_t hfsplus_osx_listxattr(struct dentry *dentry, char *list,
diff --git a/fs/hfsplus/xattr_security.c b/fs/hfsplus/xattr_security.c
index 00722765ea79..6ec5e107691f 100644
--- a/fs/hfsplus/xattr_security.c
+++ b/fs/hfsplus/xattr_security.c
@@ -7,6 +7,8 @@
  */
 
 #include <linux/security.h>
+#include <linux/nls.h>
+
 #include "hfsplus_fs.h"
 #include "xattr.h"
 #include "acl.h"
@@ -14,37 +16,43 @@
 static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
                                         void *buffer, size_t size, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
+                GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
         strcpy(xattr_name, XATTR_SECURITY_PREFIX);
         strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
 
-        return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        res = hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        kfree(xattr_name);
+        return res;
 }
 
 static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
                 const void *buffer, size_t size, int flags, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
+                GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
         strcpy(xattr_name, XATTR_SECURITY_PREFIX);
         strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
 
-        return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        res = hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        kfree(xattr_name);
+        return res;
 }
 
 static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
@@ -62,31 +70,30 @@ static int hfsplus_initxattrs(struct inode *inode,
                                 void *fs_info)
 {
         const struct xattr *xattr;
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
-        size_t xattr_name_len;
+        char *xattr_name;
         int err = 0;
 
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
+                GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
-                xattr_name_len = strlen(xattr->name);
 
-                if (xattr_name_len == 0)
+                if (!strcmp(xattr->name, ""))
                         continue;
 
-                if (xattr_name_len + XATTR_SECURITY_PREFIX_LEN >
-                                HFSPLUS_ATTR_MAX_STRLEN)
-                        return -EOPNOTSUPP;
-
                 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
                 strcpy(xattr_name +
                         XATTR_SECURITY_PREFIX_LEN, xattr->name);
                 memset(xattr_name +
-                        XATTR_SECURITY_PREFIX_LEN + xattr_name_len, 0, 1);
+                        XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
 
                 err = __hfsplus_setxattr(inode, xattr_name,
                                         xattr->value, xattr->value_len, 0);
                 if (err)
                         break;
         }
+        kfree(xattr_name);
         return err;
 }
 
diff --git a/fs/hfsplus/xattr_trusted.c b/fs/hfsplus/xattr_trusted.c
index 426cee277542..3c5f27e4746a 100644
--- a/fs/hfsplus/xattr_trusted.c
+++ b/fs/hfsplus/xattr_trusted.c
@@ -6,43 +6,51 @@
  * Handler for trusted extended attributes.
  */
 
+#include <linux/nls.h>
+
 #include "hfsplus_fs.h"
 #include "xattr.h"
 
 static int hfsplus_trusted_getxattr(struct dentry *dentry, const char *name,
                                         void *buffer, size_t size, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len + XATTR_TRUSTED_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
+                GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
         strcpy(xattr_name, XATTR_TRUSTED_PREFIX);
         strcpy(xattr_name + XATTR_TRUSTED_PREFIX_LEN, name);
 
-        return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        res = hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        kfree(xattr_name);
+        return res;
 }
 
 static int hfsplus_trusted_setxattr(struct dentry *dentry, const char *name,
                 const void *buffer, size_t size, int flags, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len + XATTR_TRUSTED_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
+                GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
         strcpy(xattr_name, XATTR_TRUSTED_PREFIX);
         strcpy(xattr_name + XATTR_TRUSTED_PREFIX_LEN, name);
 
-        return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        res = hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        kfree(xattr_name);
+        return res;
 }
 
 static size_t hfsplus_trusted_listxattr(struct dentry *dentry, char *list,
diff --git a/fs/hfsplus/xattr_user.c b/fs/hfsplus/xattr_user.c
index e34016561ae0..2b625a538b64 100644
--- a/fs/hfsplus/xattr_user.c
+++ b/fs/hfsplus/xattr_user.c
@@ -6,43 +6,51 @@
  * Handler for user extended attributes.
  */
 
+#include <linux/nls.h>
+
 #include "hfsplus_fs.h"
 #include "xattr.h"
 
 static int hfsplus_user_getxattr(struct dentry *dentry, const char *name,
                                         void *buffer, size_t size, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len + XATTR_USER_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
+                GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
         strcpy(xattr_name, XATTR_USER_PREFIX);
         strcpy(xattr_name + XATTR_USER_PREFIX_LEN, name);
 
-        return hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        res = hfsplus_getxattr(dentry, xattr_name, buffer, size);
+        kfree(xattr_name);
+        return res;
 }
 
 static int hfsplus_user_setxattr(struct dentry *dentry, const char *name,
                 const void *buffer, size_t size, int flags, int type)
 {
-        char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
-        size_t len = strlen(name);
+        char *xattr_name;
+        int res;
 
         if (!strcmp(name, ""))
                 return -EINVAL;
 
-        if (len + XATTR_USER_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
-                return -EOPNOTSUPP;
-
+        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
+                GFP_KERNEL);
+        if (!xattr_name)
+                return -ENOMEM;
         strcpy(xattr_name, XATTR_USER_PREFIX);
         strcpy(xattr_name + XATTR_USER_PREFIX_LEN, name);
 
-        return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        res = hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
+        kfree(xattr_name);
+        return res;
 }
 
 static size_t hfsplus_user_listxattr(struct dentry *dentry, char *list,