cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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name.c (3255B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  linux/fs/hpfs/name.c
      4 *
      5 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
      6 *
      7 *  operations with filenames
      8 */
      9
     10#include "hpfs_fn.h"
     11
     12static inline int not_allowed_char(unsigned char c)
     13{
     14	return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' ||
     15	      c=='>' || c=='?' || c=='\\' || c=='|';
     16}
     17
     18static inline int no_dos_char(unsigned char c)
     19{	/* Characters that are allowed in HPFS but not in DOS */
     20	return c=='+' || c==',' || c==';' || c=='=' || c=='[' || c==']';
     21}
     22
     23static inline unsigned char upcase(unsigned char *dir, unsigned char a)
     24{
     25	if (a<128 || a==255) return a>='a' && a<='z' ? a - 0x20 : a;
     26	if (!dir) return a;
     27	return dir[a-128];
     28}
     29
     30unsigned char hpfs_upcase(unsigned char *dir, unsigned char a)
     31{
     32	return upcase(dir, a);
     33}
     34
     35static inline unsigned char locase(unsigned char *dir, unsigned char a)
     36{
     37	if (a<128 || a==255) return a>='A' && a<='Z' ? a + 0x20 : a;
     38	if (!dir) return a;
     39	return dir[a];
     40}
     41
     42int hpfs_chk_name(const unsigned char *name, unsigned *len)
     43{
     44	int i;
     45	if (*len > 254) return -ENAMETOOLONG;
     46	hpfs_adjust_length(name, len);
     47	if (!*len) return -EINVAL;
     48	for (i = 0; i < *len; i++) if (not_allowed_char(name[i])) return -EINVAL;
     49	if (*len == 1) if (name[0] == '.') return -EINVAL;
     50	if (*len == 2) if (name[0] == '.' && name[1] == '.') return -EINVAL;
     51	return 0;
     52}
     53
     54unsigned char *hpfs_translate_name(struct super_block *s, unsigned char *from,
     55			  unsigned len, int lc, int lng)
     56{
     57	unsigned char *to;
     58	int i;
     59	if (hpfs_sb(s)->sb_chk >= 2) if (hpfs_is_name_long(from, len) != lng) {
     60		pr_err("Long name flag mismatch - name ");
     61		for (i = 0; i < len; i++)
     62			pr_cont("%c", from[i]);
     63		pr_cont(" misidentified as %s.\n", lng ? "short" : "long");
     64		pr_err("It's nothing serious. It could happen because of bug in OS/2.\nSet checks=normal to disable this message.\n");
     65	}
     66	if (!lc) return from;
     67	if (!(to = kmalloc(len, GFP_KERNEL))) {
     68		pr_err("can't allocate memory for name conversion buffer\n");
     69		return from;
     70	}
     71	for (i = 0; i < len; i++) to[i] = locase(hpfs_sb(s)->sb_cp_table,from[i]);
     72	return to;
     73}
     74
     75int hpfs_compare_names(struct super_block *s,
     76		       const unsigned char *n1, unsigned l1,
     77		       const unsigned char *n2, unsigned l2, int last)
     78{
     79	unsigned l = l1 < l2 ? l1 : l2;
     80	unsigned i;
     81	if (last) return -1;
     82	for (i = 0; i < l; i++) {
     83		unsigned char c1 = upcase(hpfs_sb(s)->sb_cp_table,n1[i]);
     84		unsigned char c2 = upcase(hpfs_sb(s)->sb_cp_table,n2[i]);
     85		if (c1 < c2) return -1;
     86		if (c1 > c2) return 1;
     87	}
     88	if (l1 < l2) return -1;
     89	if (l1 > l2) return 1;
     90	return 0;
     91}
     92
     93int hpfs_is_name_long(const unsigned char *name, unsigned len)
     94{
     95	int i,j;
     96	for (i = 0; i < len && name[i] != '.'; i++)
     97		if (no_dos_char(name[i])) return 1;
     98	if (!i || i > 8) return 1;
     99	if (i == len) return 0;
    100	for (j = i + 1; j < len; j++)
    101		if (name[j] == '.' || no_dos_char(name[i])) return 1;
    102	return j - i > 4;
    103}
    104
    105/* OS/2 clears dots and spaces at the end of file name, so we have to */
    106
    107void hpfs_adjust_length(const unsigned char *name, unsigned *len)
    108{
    109	if (!*len) return;
    110	if (*len == 1 && name[0] == '.') return;
    111	if (*len == 2 && name[0] == '.' && name[1] == '.') return;
    112	while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' '))
    113		(*len)--;
    114}