diff options
| author | Daniel Pinto <danielpinto52@gmail.com> | 2022-10-10 12:14:31 +0100 |
|---|---|---|
| committer | Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2022-11-12 20:59:42 +0300 |
| commit | 1d07a9dfa19914ad27bdb9ec9ac0baa2329b2ae3 (patch) | |
| tree | 5b658d1e9a95f5a8da7b79bc895415de1f43fb4c /fs/ntfs3/fsntfs.c | |
| parent | 75b5e47201329537c8b88531a59aab2cbcec8d61 (diff) | |
fs/ntfs3: Add windows_names mount option
When enabled, the windows_names mount option prevents the creation
of files or directories with names not allowed by Windows. Use
the same option name as NTFS-3G for compatibility.
Signed-off-by: Daniel Pinto <danielpinto52@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Diffstat (limited to 'fs/ntfs3/fsntfs.c')
| -rw-r--r-- | fs/ntfs3/fsntfs.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c index b6e22bcb929b..0992fb2e4eb7 100644 --- a/fs/ntfs3/fsntfs.c +++ b/fs/ntfs3/fsntfs.c @@ -98,6 +98,30 @@ const __le16 WOF_NAME[17] = { }; #endif +static const __le16 CON_NAME[3] = { + cpu_to_le16('C'), cpu_to_le16('O'), cpu_to_le16('N'), +}; + +static const __le16 NUL_NAME[3] = { + cpu_to_le16('N'), cpu_to_le16('U'), cpu_to_le16('L'), +}; + +static const __le16 AUX_NAME[3] = { + cpu_to_le16('A'), cpu_to_le16('U'), cpu_to_le16('X'), +}; + +static const __le16 PRN_NAME[3] = { + cpu_to_le16('P'), cpu_to_le16('R'), cpu_to_le16('N'), +}; + +static const __le16 COM_NAME[3] = { + cpu_to_le16('C'), cpu_to_le16('O'), cpu_to_le16('M'), +}; + +static const __le16 LPT_NAME[3] = { + cpu_to_le16('L'), cpu_to_le16('P'), cpu_to_le16('T'), +}; + // clang-format on /* @@ -2504,3 +2528,83 @@ int run_deallocate(struct ntfs_sb_info *sbi, struct runs_tree *run, bool trim) return 0; } + +static inline bool name_has_forbidden_chars(const struct le_str *fname) +{ + int i, ch; + + /* check for forbidden chars */ + for (i = 0; i < fname->len; ++i) { + ch = le16_to_cpu(fname->name[i]); + + /* control chars */ + if (ch < 0x20) + return true; + + switch (ch) { + /* disallowed by Windows */ + case '\\': + case '/': + case ':': + case '*': + case '?': + case '<': + case '>': + case '|': + case '\"': + return true; + + default: + /* allowed char */ + break; + } + } + + /* file names cannot end with space or . */ + if (fname->len > 0) { + ch = le16_to_cpu(fname->name[fname->len - 1]); + if (ch == ' ' || ch == '.') + return true; + } + + return false; +} + +static inline bool is_reserved_name(struct ntfs_sb_info *sbi, + const struct le_str *fname) +{ + int port_digit; + const __le16 *name = fname->name; + int len = fname->len; + u16 *upcase = sbi->upcase; + + /* check for 3 chars reserved names (device names) */ + /* name by itself or with any extension is forbidden */ + if (len == 3 || (len > 3 && le16_to_cpu(name[3]) == '.')) + if (!ntfs_cmp_names(name, 3, CON_NAME, 3, upcase, false) || + !ntfs_cmp_names(name, 3, NUL_NAME, 3, upcase, false) || + !ntfs_cmp_names(name, 3, AUX_NAME, 3, upcase, false) || + !ntfs_cmp_names(name, 3, PRN_NAME, 3, upcase, false)) + return true; + + /* check for 4 chars reserved names (port name followed by 1..9) */ + /* name by itself or with any extension is forbidden */ + if (len == 4 || (len > 4 && le16_to_cpu(name[4]) == '.')) { + port_digit = le16_to_cpu(name[3]); + if (port_digit >= '1' && port_digit <= '9') + if (!ntfs_cmp_names(name, 3, COM_NAME, 3, upcase, false) || + !ntfs_cmp_names(name, 3, LPT_NAME, 3, upcase, false)) + return true; + } + + return false; +} + +/* + * valid_windows_name - Check if a file name is valid in Windows. + */ +bool valid_windows_name(struct ntfs_sb_info *sbi, const struct le_str *fname) +{ + return !name_has_forbidden_chars(fname) && + !is_reserved_name(sbi, fname); +} |