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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/udf/balloc.c
View File

@ -218,16 +218,18 @@ out:
return alloc_count;
}
static int udf_bitmap_new_block(struct super_block *sb,
static udf_pblk_t udf_bitmap_new_block(struct super_block *sb,
struct udf_bitmap *bitmap, uint16_t partition,
uint32_t goal, int *err)
{
struct udf_sb_info *sbi = UDF_SB(sb);
int newbit, bit = 0, block, block_group, group_start;
int newbit, bit = 0;
udf_pblk_t block;
int block_group, group_start;
int end_goal, nr_groups, bitmap_nr, i;
struct buffer_head *bh = NULL;
char *ptr;
int newblock = 0;
udf_pblk_t newblock = 0;
*err = -ENOSPC;
mutex_lock(&sbi->s_alloc_mutex);
@ -545,13 +547,14 @@ static int udf_table_prealloc_blocks(struct super_block *sb,
return alloc_count;
}
static int udf_table_new_block(struct super_block *sb,
static udf_pblk_t udf_table_new_block(struct super_block *sb,
struct inode *table, uint16_t partition,
uint32_t goal, int *err)
{
struct udf_sb_info *sbi = UDF_SB(sb);
uint32_t spread = 0xFFFFFFFF, nspread = 0xFFFFFFFF;
uint32_t newblock = 0, adsize;
udf_pblk_t newblock = 0;
uint32_t adsize;
uint32_t elen, goal_elen = 0;
struct kernel_lb_addr eloc, uninitialized_var(goal_eloc);
struct extent_position epos, goal_epos;
@ -700,12 +703,12 @@ inline int udf_prealloc_blocks(struct super_block *sb,
return allocated;
}
inline int udf_new_block(struct super_block *sb,
inline udf_pblk_t udf_new_block(struct super_block *sb,
struct inode *inode,
uint16_t partition, uint32_t goal, int *err)
{
struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
int block;
udf_pblk_t block;
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
block = udf_bitmap_new_block(sb,

2
fs/udf/dir.c
View File

@ -43,7 +43,7 @@ static int udf_readdir(struct file *file, struct dir_context *ctx)
struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
struct fileIdentDesc *fi = NULL;
struct fileIdentDesc cfi;
int block, iblock;
udf_pblk_t block, iblock;
loff_t nf_pos;
int flen;
unsigned char *fname = NULL, *copy_name = NULL;

3
fs/udf/directory.c
View File

@ -26,7 +26,8 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
sector_t *offset)
{
struct fileIdentDesc *fi;
int i, num, block;
int i, num;
udf_pblk_t block;
struct buffer_head *tmp, *bha[16];
struct udf_inode_info *iinfo = UDF_I(dir);

2
fs/udf/ialloc.c
View File

@ -50,7 +50,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode)
struct super_block *sb = dir->i_sb;
struct udf_sb_info *sbi = UDF_SB(sb);
struct inode *inode;
int block;
udf_pblk_t block;
uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
struct udf_inode_info *iinfo;
struct udf_inode_info *dinfo = UDF_I(dir);

30
fs/udf/inode.c
View File

@ -52,7 +52,7 @@ static int udf_alloc_i_data(struct inode *inode, size_t size);
static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
static int8_t udf_insert_aext(struct inode *, struct extent_position,
struct kernel_lb_addr, uint32_t);
static void udf_split_extents(struct inode *, int *, int, int,
static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
struct kernel_long_ad *, int *);
static void udf_prealloc_extents(struct inode *, int, int,
struct kernel_long_ad *, int *);
@ -316,10 +316,10 @@ int udf_expand_file_adinicb(struct inode *inode)
return err;
}
struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
int *err)
struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
udf_pblk_t *block, int *err)
{
int newblock;
udf_pblk_t newblock;
struct buffer_head *dbh = NULL;
struct kernel_lb_addr eloc;
uint8_t alloctype;
@ -446,7 +446,7 @@ abort:
return err;
}
static struct buffer_head *udf_getblk(struct inode *inode, long block,
static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
int create, int *err)
{
struct buffer_head *bh;
@ -663,11 +663,11 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
struct kernel_lb_addr eloc, tmpeloc;
int c = 1;
loff_t lbcount = 0, b_off = 0;
uint32_t newblocknum, newblock;
udf_pblk_t newblocknum, newblock;
sector_t offset = 0;
int8_t etype;
struct udf_inode_info *iinfo = UDF_I(inode);
int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
int lastblock = 0;
bool isBeyondEOF;
@ -879,8 +879,8 @@ out_free:
}
static void udf_split_extents(struct inode *inode, int *c, int offset,
int newblocknum, struct kernel_long_ad *laarr,
int *endnum)
udf_pblk_t newblocknum,
struct kernel_long_ad *laarr, int *endnum)
{
unsigned long blocksize = inode->i_sb->s_blocksize;
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
@ -1166,7 +1166,7 @@ static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr
}
}
struct buffer_head *udf_bread(struct inode *inode, int block,
struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
int create, int *err)
{
struct buffer_head *bh = NULL;
@ -1852,7 +1852,7 @@ struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
return inode;
}
int udf_setup_indirect_aext(struct inode *inode, int block,
int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
struct extent_position *epos)
{
struct super_block *sb = inode->i_sb;
@ -1994,7 +1994,7 @@ int udf_add_aext(struct inode *inode, struct extent_position *epos,
if (epos->offset + (2 * adsize) > sb->s_blocksize) {
int err;
int new_block;
udf_pblk_t new_block;
new_block = udf_new_block(sb, NULL,
epos->block.partitionReferenceNum,
@ -2076,7 +2076,7 @@ int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
(EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
int block;
udf_pblk_t block;
if (++indirections > UDF_MAX_INDIR_EXTS) {
udf_err(inode->i_sb,
@ -2289,13 +2289,13 @@ int8_t inode_bmap(struct inode *inode, sector_t block,
return etype;
}
long udf_block_map(struct inode *inode, sector_t block)
udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
{
struct kernel_lb_addr eloc;
uint32_t elen;
sector_t offset;
struct extent_position epos = {};
int ret;
udf_pblk_t ret;
down_read(&UDF_I(inode)->i_data_sem);

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));

9
fs/udf/namei.c
View File

@ -164,7 +164,8 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
{
struct fileIdentDesc *fi = NULL;
loff_t f_pos;
int block, flen;
udf_pblk_t block;
int flen;
unsigned char *fname = NULL, *copy_name = NULL;
unsigned char *nameptr;
uint8_t lfi;
@ -352,7 +353,7 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
int nfidlen;
uint8_t lfi;
uint16_t liu;
int block;
udf_pblk_t block;
struct kernel_lb_addr eloc;
uint32_t elen = 0;
sector_t offset;
@ -749,7 +750,7 @@ static int empty_dir(struct inode *dir)
struct udf_fileident_bh fibh;
loff_t f_pos;
loff_t size = udf_ext0_offset(dir) + dir->i_size;
int block;
udf_pblk_t block;
struct kernel_lb_addr eloc;
uint32_t elen;
sector_t offset;
@ -913,7 +914,7 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry,
int eoffset, elen = 0;
uint8_t *ea;
int err;
int block;
udf_pblk_t block;
unsigned char *name = NULL;
int namelen;
struct udf_inode_info *iinfo;

2
fs/udf/super.c
View File

@ -2389,7 +2389,7 @@ static unsigned int udf_count_free_bitmap(struct super_block *sb,
struct buffer_head *bh = NULL;
unsigned int accum = 0;
int index;
int block = 0, newblock;
udf_pblk_t block = 0, newblock;
struct kernel_lb_addr loc;
uint32_t bytes;
uint8_t *ptr;

2
fs/udf/truncate.c
View File

@ -48,7 +48,7 @@ static void extent_trunc(struct inode *inode, struct extent_position *epos,
if (elen != nelen) {
udf_write_aext(inode, epos, &neloc, nelen, 0);
if (last_block - first_block > 0) {
if (last_block > first_block) {
if (etype == (EXT_RECORDED_ALLOCATED >> 30))
mark_inode_dirty(inode);

21
fs/udf/udfdecl.h
View File

@ -73,6 +73,8 @@ static inline size_t udf_ext0_offset(struct inode *inode)
/* computes tag checksum */
u8 udf_tag_checksum(const struct tag *t);
typedef uint32_t udf_pblk_t;
struct dentry;
struct inode;
struct task_struct;
@ -144,15 +146,17 @@ static inline struct inode *udf_iget(struct super_block *sb,
return __udf_iget(sb, ino, false);
}
extern int udf_expand_file_adinicb(struct inode *);
extern struct buffer_head *udf_expand_dir_adinicb(struct inode *, int *, int *);
extern struct buffer_head *udf_bread(struct inode *, int, int, int *);
extern struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
udf_pblk_t *block, int *err);
extern struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
int create, int *err);
extern int udf_setsize(struct inode *, loff_t);
extern void udf_evict_inode(struct inode *);
extern int udf_write_inode(struct inode *, struct writeback_control *wbc);
extern long udf_block_map(struct inode *, sector_t);
extern udf_pblk_t udf_block_map(struct inode *inode, sector_t block);
extern int8_t inode_bmap(struct inode *, sector_t, struct extent_position *,
struct kernel_lb_addr *, uint32_t *, sector_t *);
extern int udf_setup_indirect_aext(struct inode *inode, int block,
extern int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
struct extent_position *epos);
extern int __udf_add_aext(struct inode *inode, struct extent_position *epos,
struct kernel_lb_addr *eloc, uint32_t elen, int inc);
@ -168,8 +172,9 @@ extern int8_t udf_current_aext(struct inode *, struct extent_position *,
struct kernel_lb_addr *, uint32_t *, int);
/* misc.c */
extern struct buffer_head *udf_tgetblk(struct super_block *, int);
extern struct buffer_head *udf_tread(struct super_block *, int);
extern struct buffer_head *udf_tgetblk(struct super_block *sb,
udf_pblk_t block);
extern struct buffer_head *udf_tread(struct super_block *sb, udf_pblk_t block);
extern struct genericFormat *udf_add_extendedattr(struct inode *, uint32_t,
uint32_t, uint8_t);
extern struct genericFormat *udf_get_extendedattr(struct inode *, uint32_t,
@ -228,8 +233,8 @@ extern void udf_free_blocks(struct super_block *, struct inode *,
struct kernel_lb_addr *, uint32_t, uint32_t);
extern int udf_prealloc_blocks(struct super_block *, struct inode *, uint16_t,
uint32_t, uint32_t);
extern int udf_new_block(struct super_block *, struct inode *, uint16_t,
uint32_t, int *);
extern udf_pblk_t udf_new_block(struct super_block *sb, struct inode *inode,
uint16_t partition, uint32_t goal, int *err);
/* directory.c */
extern struct fileIdentDesc *udf_fileident_read(struct inode *, loff_t *,