From: "Pali Rohár" <pali@kernel.org>
To: linux-fsdevel@vger.kernel.org,
linux-ntfs-dev@lists.sourceforge.net, linux-cifs@vger.kernel.org,
jfs-discussion@lists.sourceforge.net,
linux-kernel@vger.kernel.org,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Jan Kara" <jack@suse.cz>,
"OGAWA Hirofumi" <hirofumi@mail.parknet.co.jp>,
"Theodore Y . Ts'o" <tytso@mit.edu>,
"Luis de Bethencourt" <luisbg@kernel.org>,
"Salah Triki" <salah.triki@gmail.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Dave Kleikamp" <shaggy@kernel.org>,
"Anton Altaparmakov" <anton@tuxera.com>,
"Pavel Machek" <pavel@ucw.cz>, "Marek Behún" <marek.behun@nic.cz>,
"Christoph Hellwig" <hch@infradead.org>
Subject: [RFC PATCH 12/20] hfs: Do not use broken utf8 NLS table for iocharset=utf8 mount option
Date: Sun, 8 Aug 2021 18:24:45 +0200 [thread overview]
Message-ID: <20210808162453.1653-13-pali@kernel.org> (raw)
In-Reply-To: <20210808162453.1653-1-pali@kernel.org>
NLS table for utf8 is broken and cannot be fixed.
So instead of broken utf8 nls functions char2uni() and uni2char() use
functions utf8_to_utf32() and utf32_to_utf8() which implements correct
encoding and decoding between Unicode code points and UTF-8 sequence.
When iochatset=utf8 is used then set hsb->nls_io to NULL and use it for
distinguish between the fact if NLS table or native UTF-8 functions should
be used.
Signed-off-by: Pali Rohár <pali@kernel.org>
---
fs/hfs/super.c | 33 ++++++++++++++++++++++-----------
fs/hfs/trans.c | 24 ++++++++++++++++++++----
2 files changed, 42 insertions(+), 15 deletions(-)
diff --git a/fs/hfs/super.c b/fs/hfs/super.c
index 86bc46746c7f..076308df41cf 100644
--- a/fs/hfs/super.c
+++ b/fs/hfs/super.c
@@ -149,10 +149,13 @@ static int hfs_show_options(struct seq_file *seq, struct dentry *root)
seq_printf(seq, ",part=%u", sbi->part);
if (sbi->session >= 0)
seq_printf(seq, ",session=%u", sbi->session);
- if (sbi->nls_disk)
+ if (sbi->nls_disk) {
seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
- if (sbi->nls_io)
- seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
+ if (sbi->nls_io)
+ seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
+ else
+ seq_puts(seq, ",iocharset=utf8");
+ }
if (sbi->s_quiet)
seq_printf(seq, ",quiet");
return 0;
@@ -225,6 +228,7 @@ static int parse_options(char *options, struct hfs_sb_info *hsb)
char *p;
substring_t args[MAX_OPT_ARGS];
int tmp, token;
+ int have_iocharset;
/* initialize the sb with defaults */
hsb->s_uid = current_uid();
@@ -239,6 +243,8 @@ static int parse_options(char *options, struct hfs_sb_info *hsb)
if (!options)
return 1;
+ have_iocharset = 0;
+
while ((p = strsep(&options, ",")) != NULL) {
if (!*p)
continue;
@@ -332,18 +338,22 @@ static int parse_options(char *options, struct hfs_sb_info *hsb)
kfree(p);
break;
case opt_iocharset:
- if (hsb->nls_io) {
+ if (have_iocharset) {
pr_err("unable to change iocharset\n");
return 0;
}
p = match_strdup(&args[0]);
- if (p)
- hsb->nls_io = load_nls(p);
- if (!hsb->nls_io) {
- pr_err("unable to load iocharset \"%s\"\n", p);
- kfree(p);
+ if (!p)
return 0;
+ if (strcmp(p, "utf8") != 0) {
+ hsb->nls_io = load_nls(p);
+ if (!hsb->nls_io) {
+ pr_err("unable to load iocharset \"%s\"\n", p);
+ kfree(p);
+ return 0;
+ }
}
+ have_iocharset = 1;
kfree(p);
break;
default:
@@ -351,7 +361,7 @@ static int parse_options(char *options, struct hfs_sb_info *hsb)
}
}
- if (hsb->nls_io && !hsb->nls_disk) {
+ if (have_iocharset && !hsb->nls_disk) {
/*
* Previous version of hfs driver did something unexpected:
* When codepage was not defined but iocharset was then
@@ -382,7 +392,8 @@ static int parse_options(char *options, struct hfs_sb_info *hsb)
return 0;
}
}
- if (hsb->nls_disk && !hsb->nls_io) {
+ if (hsb->nls_disk &&
+ !have_iocharset && strcmp(CONFIG_NLS_DEFAULT, "utf8") != 0) {
hsb->nls_io = load_nls_default();
if (!hsb->nls_io) {
pr_err("unable to load default iocharset\n");
diff --git a/fs/hfs/trans.c b/fs/hfs/trans.c
index c75682c61b06..bff8e54003ab 100644
--- a/fs/hfs/trans.c
+++ b/fs/hfs/trans.c
@@ -44,7 +44,7 @@ int hfs_mac2asc(struct super_block *sb, char *out, const struct hfs_name *in)
srclen = HFS_NAMELEN;
dst = out;
dstlen = HFS_MAX_NAMELEN;
- if (nls_io) {
+ if (nls_disk) {
wchar_t ch;
while (srclen > 0) {
@@ -57,7 +57,12 @@ int hfs_mac2asc(struct super_block *sb, char *out, const struct hfs_name *in)
srclen -= size;
if (ch == '/')
ch = ':';
- size = nls_io->uni2char(ch, dst, dstlen);
+ if (nls_io)
+ size = nls_io->uni2char(ch, dst, dstlen);
+ else if (dstlen > 0)
+ size = utf32_to_utf8(ch, dst, dstlen);
+ else
+ size = -ENAMETOOLONG;
if (size < 0) {
if (size == -ENAMETOOLONG)
goto out;
@@ -101,11 +106,22 @@ void hfs_asc2mac(struct super_block *sb, struct hfs_name *out, const struct qstr
srclen = in->len;
dst = out->name;
dstlen = HFS_NAMELEN;
- if (nls_io) {
+ if (nls_disk) {
wchar_t ch;
+ unicode_t u;
while (srclen > 0) {
- size = nls_io->char2uni(src, srclen, &ch);
+ if (nls_io)
+ size = nls_io->char2uni(src, srclen, &ch);
+ else {
+ size = utf8_to_utf32(str, strlen, &u);
+ if (size >= 0) {
+ if (u <= MAX_WCHAR_T)
+ ch = u;
+ else
+ size = -EINVAL;
+ }
+ }
if (size < 0) {
ch = '?';
size = 1;
--
2.20.1
next prev parent reply other threads:[~2021-08-08 16:25 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-08 16:24 [RFC PATCH 00/20] fs: Remove usage of broken nls_utf8 and drop it Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 01/20] fat: Fix iocharset=utf8 mount option Pali Rohár
2021-08-15 3:42 ` OGAWA Hirofumi
2021-08-15 9:42 ` Pali Rohár
2021-08-15 11:23 ` OGAWA Hirofumi
2021-08-23 3:51 ` Kari Argillander
2021-08-08 16:24 ` [RFC PATCH 02/20] hfsplus: Add iocharset= mount option as alias for nls= Pali Rohár
2021-08-09 17:51 ` Viacheslav Dubeyko
2021-08-09 20:49 ` Kari Argillander
2021-08-09 21:25 ` Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 03/20] udf: Fix iocharset=utf8 mount option Pali Rohár
2021-08-12 14:17 ` Jan Kara
2021-08-12 15:51 ` Pali Rohár
2021-08-13 13:48 ` Jan Kara
2021-08-19 8:34 ` Pali Rohár
2021-08-19 10:41 ` Jan Kara
2021-08-08 16:24 ` [RFC PATCH 04/20] isofs: joliet: " Pali Rohár
2021-08-12 14:18 ` Jan Kara
2021-08-08 16:24 ` [RFC PATCH 05/20] ntfs: Undeprecate iocharset= " Pali Rohár
2021-08-09 20:52 ` Kari Argillander
2021-08-19 1:21 ` Kari Argillander
2021-08-19 8:12 ` Pali Rohár
2021-08-19 10:23 ` Kari Argillander
2021-08-19 22:04 ` Pali Rohár
2021-08-19 23:18 ` Kari Argillander
2021-08-08 16:24 ` [RFC PATCH 06/20] ntfs: Fix error processing when load_nls() fails Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 07/20] befs: Fix printing iocharset= mount option Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 08/20] befs: Rename enum value Opt_charset to Opt_iocharset to match " Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 09/20] befs: Fix error processing when load_nls() fails Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 10/20] befs: Allow to use native UTF-8 mode Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 11/20] hfs: Explicitly set hsb->nls_disk when hsb->nls_io is set Pali Rohár
2021-08-09 17:31 ` Viacheslav Dubeyko
2021-08-09 17:37 ` Matthew Wilcox
2021-08-09 17:47 ` Pali Rohár
2021-08-09 20:43 ` Steve French
2021-08-09 18:00 ` Viacheslav Dubeyko
2021-08-08 16:24 ` Pali Rohár [this message]
2021-08-09 17:49 ` [RFC PATCH 12/20] hfs: Do not use broken utf8 NLS table for iocharset=utf8 mount option Viacheslav Dubeyko
2022-09-25 12:06 ` Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 13/20] hfsplus: " Pali Rohár
2021-08-09 17:42 ` Viacheslav Dubeyko
2022-09-25 12:12 ` Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 14/20] jfs: Remove custom iso8859-1 implementation Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 15/20] jfs: Fix buffer overflow in jfs_strfromUCS_le() function Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 16/20] jfs: Do not use broken utf8 NLS table for iocharset=utf8 mount option Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 17/20] ntfs: " Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 18/20] cifs: " Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 19/20] cifs: Remove usage of load_nls_default() calls Pali Rohár
2021-08-08 16:24 ` [RFC PATCH 20/20] nls: Drop broken nls_utf8 module Pali Rohár
2021-09-03 21:26 ` [RFC PATCH 00/20] fs: Remove usage of broken nls_utf8 and drop it Kari Argillander
2021-09-03 21:37 ` Pali Rohár
2021-09-03 22:06 ` Kari Argillander
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