linux/fs/udf/symlink.c
Linus Torvalds 274978f173 \n
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Merge tag 'fixes_for_v6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull UDF and ext2 fixes from Jan Kara:

 - Rewrite of udf directory iteration code to address multiple syzbot
   reports

 - Fixes to udf extent handling and block mapping code to address
   several syzbot reports and filesystem corruption issues uncovered by
   fsx & fsstress

 - Convert udf to kmap_local()

 - Add sanity checks when loading udf bitmaps

 - Drop old VARCONV support which I've never seen used and which was
   broken for quite some years without anybody noticing

 - Finish conversion of ext2 to kmap_local()

 - One fix to mpage_writepages() on which other udf fixes depend

* tag 'fixes_for_v6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: (78 commits)
  udf: Avoid directory type conversion failure due to ENOMEM
  udf: Use unsigned variables for size calculations
  udf: remove reporting loc in debug output
  udf: Check consistency of Space Bitmap Descriptor
  udf: Fix file counting in LVID
  udf: Limit file size to 4TB
  udf: Don't return bh from udf_expand_dir_adinicb()
  udf: Convert udf_expand_file_adinicb() to avoid kmap_atomic()
  udf: Convert udf_adinicb_writepage() to memcpy_to_page()
  udf: Switch udf_adinicb_readpage() to kmap_local_page()
  udf: Move udf_adinicb_readpage() to inode.c
  udf: Mark aops implementation static
  udf: Switch to single address_space_operations
  udf: Add handling of in-ICB files to udf_bmap()
  udf: Convert all file types to use udf_write_end()
  udf: Convert in-ICB files to use udf_write_begin()
  udf: Convert in-ICB files to use udf_direct_IO()
  udf: Convert in-ICB files to use udf_writepages()
  udf: Unify .read_folio for normal and in-ICB files
  udf: Fix off-by-one error when discarding preallocation
  ...
2023-02-20 12:44:08 -08:00

186 lines
4.2 KiB
C

/*
* symlink.c
*
* PURPOSE
* Symlink handling routines for the OSTA-UDF(tm) filesystem.
*
* COPYRIGHT
* This file is distributed under the terms of the GNU General Public
* License (GPL). Copies of the GPL can be obtained from:
* ftp://prep.ai.mit.edu/pub/gnu/GPL
* Each contributing author retains all rights to their own work.
*
* (C) 1998-2001 Ben Fennema
* (C) 1999 Stelias Computing Inc
*
* HISTORY
*
* 04/16/99 blf Created.
*
*/
#include "udfdecl.h"
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/stat.h>
#include <linux/pagemap.h>
#include "udf_i.h"
static int udf_pc_to_char(struct super_block *sb, unsigned char *from,
int fromlen, unsigned char *to, int tolen)
{
struct pathComponent *pc;
int elen = 0;
int comp_len;
unsigned char *p = to;
/* Reserve one byte for terminating \0 */
tolen--;
while (elen < fromlen) {
pc = (struct pathComponent *)(from + elen);
elen += sizeof(struct pathComponent);
switch (pc->componentType) {
case 1:
/*
* Symlink points to some place which should be agreed
* upon between originator and receiver of the media. Ignore.
*/
if (pc->lengthComponentIdent > 0) {
elen += pc->lengthComponentIdent;
break;
}
fallthrough;
case 2:
if (tolen == 0)
return -ENAMETOOLONG;
p = to;
*p++ = '/';
tolen--;
break;
case 3:
if (tolen < 3)
return -ENAMETOOLONG;
memcpy(p, "../", 3);
p += 3;
tolen -= 3;
break;
case 4:
if (tolen < 2)
return -ENAMETOOLONG;
memcpy(p, "./", 2);
p += 2;
tolen -= 2;
/* that would be . - just ignore */
break;
case 5:
elen += pc->lengthComponentIdent;
if (elen > fromlen)
return -EIO;
comp_len = udf_get_filename(sb, pc->componentIdent,
pc->lengthComponentIdent,
p, tolen);
if (comp_len < 0)
return comp_len;
p += comp_len;
tolen -= comp_len;
if (tolen == 0)
return -ENAMETOOLONG;
*p++ = '/';
tolen--;
break;
}
}
if (p > to + 1)
p[-1] = '\0';
else
p[0] = '\0';
return 0;
}
static int udf_symlink_filler(struct file *file, struct folio *folio)
{
struct page *page = &folio->page;
struct inode *inode = page->mapping->host;
struct buffer_head *bh = NULL;
unsigned char *symlink;
int err = 0;
unsigned char *p = page_address(page);
struct udf_inode_info *iinfo = UDF_I(inode);
/* We don't support symlinks longer than one block */
if (inode->i_size > inode->i_sb->s_blocksize) {
err = -ENAMETOOLONG;
goto out_unlock;
}
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
symlink = iinfo->i_data + iinfo->i_lenEAttr;
} else {
bh = udf_bread(inode, 0, 0, &err);
if (!bh) {
if (!err)
err = -EFSCORRUPTED;
goto out_err;
}
symlink = bh->b_data;
}
err = udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p, PAGE_SIZE);
brelse(bh);
if (err)
goto out_err;
SetPageUptodate(page);
unlock_page(page);
return 0;
out_err:
SetPageError(page);
out_unlock:
unlock_page(page);
return err;
}
static int udf_symlink_getattr(struct mnt_idmap *idmap,
const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int flags)
{
struct dentry *dentry = path->dentry;
struct inode *inode = d_backing_inode(dentry);
struct page *page;
generic_fillattr(&nop_mnt_idmap, inode, stat);
page = read_mapping_page(inode->i_mapping, 0, NULL);
if (IS_ERR(page))
return PTR_ERR(page);
/*
* UDF uses non-trivial encoding of symlinks so i_size does not match
* number of characters reported by readlink(2) which apparently some
* applications expect. Also POSIX says that "The value returned in the
* st_size field shall be the length of the contents of the symbolic
* link, and shall not count a trailing null if one is present." So
* let's report the length of string returned by readlink(2) for
* st_size.
*/
stat->size = strlen(page_address(page));
put_page(page);
return 0;
}
/*
* symlinks can't do much...
*/
const struct address_space_operations udf_symlink_aops = {
.read_folio = udf_symlink_filler,
};
const struct inode_operations udf_symlink_inode_operations = {
.get_link = page_get_link,
.getattr = udf_symlink_getattr,
};