GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-23 07:12:09 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

udf: Fix 64-bit sign extension issues affecting blocks > 0x7FFFFFFF

Browse source 
Large (> 1 TiB) UDF filesystems appear subject to several problems when
mounted on 64-bit systems:

* readdir() can fail on a directory containing File Identifiers residing
  above 0x7FFFFFFF. This manifests as a 'ls' command failing with EIO.

* FIBMAP on a file block located above 0x7FFFFFFF can return a negative
  value. The low 32 bits are correct, but applications that don't mask the
  high 32 bits of the result can perform incorrectly.

Per suggestion by Jan Kara, introduce a udf_pblk_t type for representation
of UDF block addresses. Ultimately, all driver functions that manipulate
UDF block addresses should use this type; for now, deployment is limited
to functions with actual or potential sign extension issues.

Changes to udf_readdir() and udf_block_map() address the issues noted
above; other changes address potential similar issues uncovered during
audit of the driver code.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Steve Magnani 2017-10-12 08:48:40 -05:00 • committed by Jan Kara
parent 503c3117d0
commit b490bdd630
10 changed files with 51 additions and 41 deletions
Download patch file Download diff file Expand all files Collapse all files

4
fs/udf/misc.c
View file

@ -28,7 +28,7 @@
#include "udf_i.h"
#include "udf_sb.h"
struct buffer_head *udf_tgetblk(struct super_block *sb, int block)
struct buffer_head *udf_tgetblk(struct super_block *sb, udf_pblk_t block)
{
if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
return sb_getblk(sb, udf_fixed_to_variable(block));
@ -36,7 +36,7 @@ struct buffer_head *udf_tgetblk(struct super_block *sb, int block)
return sb_getblk(sb, block);
}
struct buffer_head *udf_tread(struct super_block *sb, int block)
struct buffer_head *udf_tread(struct super_block *sb, udf_pblk_t block)
{
if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV))
return sb_bread(sb, udf_fixed_to_variable(block));