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Message-ID: <47B56C20.3030200@gmail.com>
Date: Fri, 15 Feb 2008 18:40:32 +0800
From: Keith Mok <ek9852@...il.com>
To: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
CC: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfat: bug fix for vfat cannot handle filename with 255
asian characters when mounted with utf8
Patch modified according to coding style in Linux.
NLS and UTF8 filename length are checked and limited to 255 after convert to unicode in xlate_to_uni function.
Signed-off-by: Keith Mok <ek9852@...il.com>
---
Keith Mok
--- linux-source-2.6.22/fs/fat/dir.c.orig 2007-07-09 07:32:17.000000000 +0800
+++ linux-source-2.6.22/fs/fat/dir.c 2008-02-15 17:24:18.000000000 +0800
@@ -124,7 +124,7 @@ static inline int fat_get_entry(struct i
* but ignore that right now.
* Ahem... Stack smashing in ring 0 isn't fun. Fixed.
*/
-static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
+static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int len, int uni_xlate,
struct nls_table *nls)
{
wchar_t *ip, ec;
@@ -135,10 +135,11 @@ static int uni16_to_x8(unsigned char *as
ip = uni;
op = ascii;
- while (*ip) {
+ while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) {
ec = *ip++;
if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
op += charlen;
+ len -= charlen;
} else {
if (uni_xlate == 1) {
*op = ':';
@@ -149,15 +150,18 @@ static int uni16_to_x8(unsigned char *as
ec >>= 4;
}
op += 5;
+ len -= 5;
} else {
*op++ = '?';
+ len--;
}
}
- /* We have some slack there, so it's OK */
- if (op>ascii+256) {
- op = ascii + 256;
- break;
- }
+ }
+
+ if(unlikely(*ip)) {
+ printk(KERN_WARNING
+ "FAT: truncated while convert unicode characters in %s\n",
+ __FUNCTION__);
}
*op = 0;
return (op - ascii);
@@ -311,9 +315,11 @@ int fat_search_long(struct inode *inode,
struct nls_table *nls_io = sbi->nls_io;
struct nls_table *nls_disk = sbi->nls_disk;
wchar_t bufuname[14];
- unsigned char xlate_len, nr_slots;
+ int xlate_len;
+ unsigned char nr_slots;
wchar_t *unicode = NULL;
- unsigned char work[8], bufname[260]; /* 256 + 4 */
+ unsigned char work[8];
+ unsigned char *bufname = NULL;
int uni_xlate = sbi->options.unicode_xlate;
int utf8 = sbi->options.utf8;
int anycase = (sbi->options.name_check != 's');
@@ -321,6 +327,10 @@ int fat_search_long(struct inode *inode,
loff_t cpos = 0;
int chl, i, j, last_u, err;
+ bufname = (unsigned char*)__get_free_page(GFP_KERNEL);
+ if (!bufname) {
+ return -ENOMEM;
+ }
err = -ENOENT;
while(1) {
if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
@@ -383,8 +393,8 @@ parse_record:
bufuname[last_u] = 0x0000;
xlate_len = utf8
- ?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
- :uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
+ ?utf8_wcstombs(bufname, bufuname, PAGE_SIZE)
+ :uni16_to_x8(bufname, bufuname, PAGE_SIZE, uni_xlate, nls_io);
if (xlate_len == name_len)
if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
(anycase && !nls_strnicmp(nls_io, name, bufname,
@@ -393,8 +403,8 @@ parse_record:
if (nr_slots) {
xlate_len = utf8
- ?utf8_wcstombs(bufname, unicode, sizeof(bufname))
- :uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
+ ?utf8_wcstombs(bufname, unicode, PAGE_SIZE)
+ :uni16_to_x8(bufname, unicode, PAGE_SIZE, uni_xlate, nls_io);
if (xlate_len != name_len)
continue;
if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
@@ -413,6 +423,8 @@ Found:
sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
err = 0;
EODir:
+ if (bufname)
+ free_page((unsigned long)bufname);
if (unicode)
free_page((unsigned long)unicode);
@@ -593,7 +605,7 @@ parse_record:
if (isvfat) {
bufuname[j] = 0x0000;
i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
- : uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
+ : uni16_to_x8(bufname, bufuname, sizeof(bufname), uni_xlate, nls_io);
}
fill_name = bufname;
@@ -605,7 +617,7 @@ parse_record:
int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
int long_len = utf8
? utf8_wcstombs(longname, unicode, buf_size)
- : uni16_to_x8(longname, unicode, uni_xlate, nls_io);
+ : uni16_to_x8(longname, unicode, buf_size, uni_xlate, nls_io);
if (!both) {
fill_name = longname;
--- linux-source-2.6.22/fs/vfat/namei.c.orig 2007-07-09 07:32:17.000000000 +0800
+++ linux-source-2.6.22/fs/vfat/namei.c 2008-02-15 18:33:15.000000000 +0800
@@ -176,15 +176,8 @@ static inline int vfat_is_used_badchars(
for (i = 0; i < len; i++)
if (vfat_bad_char(s[i]))
return -EINVAL;
- return 0;
-}
-
-static int vfat_valid_longname(const unsigned char *name, unsigned int len)
-{
- if (name[len - 1] == ' ')
+ if (s[i - 1] == 0x0020) /* last character cannot be space */
return -EINVAL;
- if (len >= 256)
- return -ENAMETOOLONG;
return 0;
}
@@ -485,11 +478,14 @@ xlate_to_uni(const unsigned char *name,
*/
*outlen -= (name_len - len);
+ if (*outlen > 255)
+ return -ENAMETOOLONG;
+
op = &outname[*outlen * sizeof(wchar_t)];
} else {
if (nls) {
for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 260;
+ i < len && *outlen <= 255;
*outlen += 1)
{
if (escape && (*ip == ':')) {
@@ -525,18 +521,20 @@ xlate_to_uni(const unsigned char *name,
op += 2;
}
}
+ if (i < len)
+ return -ENAMETOOLONG;
} else {
for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 260;
+ i < len && *outlen <= 255;
i++, *outlen += 1)
{
*op++ = *ip++;
*op++ = 0;
}
+ if (i < len)
+ return -ENAMETOOLONG;
}
}
- if (*outlen > 260)
- return -ENAMETOOLONG;
*longlen = *outlen;
if (*outlen % 13) {
@@ -574,9 +572,6 @@ static int vfat_build_slots(struct inode
loff_t offset;
*nr_slots = 0;
- err = vfat_valid_longname(name, len);
- if (err)
- return err;
page = __get_free_page(GFP_KERNEL);
if (!page)
--
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