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Subject[PATCH v2 1/3] udf: Fix 64-bit sign extension issues affecting blocks > 0x7FFFFFFF
Date
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>
---
diff -uprN a/fs/udf/balloc.c b/fs/udf/balloc.c
--- a/fs/udf/balloc.c 2017-10-07 16:46:37.694130197 -0500
+++ b/fs/udf/balloc.c 2017-10-11 13:08:47.969313878 -0500
@@ -218,16 +218,17 @@ 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, 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 +546,14 @@ static int udf_table_prealloc_blocks(str
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 +702,12 @@ inline int udf_prealloc_blocks(struct su
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,
diff -uprN a/fs/udf/dir.c b/fs/udf/dir.c
--- a/fs/udf/dir.c 2017-10-07 16:46:37.694130197 -0500
+++ b/fs/udf/dir.c 2017-10-11 08:01:39.376578063 -0500
@@ -43,7 +43,7 @@ static int udf_readdir(struct file *file
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;
diff -uprN a/fs/udf/directory.c b/fs/udf/directory.c
--- a/fs/udf/directory.c 2017-10-07 16:46:37.694130197 -0500
+++ b/fs/udf/directory.c 2017-10-11 12:02:27.226674863 -0500
@@ -26,7 +26,8 @@ struct fileIdentDesc *udf_fileident_read
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);

diff -uprN a/fs/udf/ialloc.c b/fs/udf/ialloc.c
--- a/fs/udf/ialloc.c 2017-10-07 12:06:18.749230803 -0500
+++ b/fs/udf/ialloc.c 2017-10-11 12:25:21.255500184 -0500
@@ -50,7 +50,7 @@ struct inode *udf_new_inode(struct inode
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);
diff -uprN a/fs/udf/inode.c b/fs/udf/inode.c
--- a/fs/udf/inode.c 2017-10-07 16:46:37.694130197 -0500
+++ b/fs/udf/inode.c 2017-10-11 12:49:03.972233635 -0500
@@ -52,7 +52,7 @@ static int udf_alloc_i_data(struct inode
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
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 inod
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 in
}
}

-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_bl
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, st

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

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, s
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);

diff -uprN a/fs/udf/misc.c b/fs/udf/misc.c
--- a/fs/udf/misc.c 2017-10-07 16:46:37.694130197 -0500
+++ b/fs/udf/misc.c 2017-10-11 08:01:39.380578114 -0500
@@ -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 s
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));
diff -uprN a/fs/udf/namei.c b/fs/udf/namei.c
--- a/fs/udf/namei.c 2017-10-07 16:46:37.694130197 -0500
+++ b/fs/udf/namei.c 2017-10-11 13:12:15.668773392 -0500
@@ -164,7 +164,8 @@ static struct fileIdentDesc *udf_find_en
{
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_ent
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
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;
diff -uprN a/fs/udf/super.c b/fs/udf/super.c
--- a/fs/udf/super.c 2017-10-07 16:46:37.698130278 -0500
+++ b/fs/udf/super.c 2017-10-11 08:01:39.380578114 -0500
@@ -2389,7 +2389,7 @@ static unsigned int udf_count_free_bitma
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;
diff -uprN a/fs/udf/truncate.c b/fs/udf/truncate.c
--- a/fs/udf/truncate.c 2017-10-07 12:06:18.749230803 -0500
+++ b/fs/udf/truncate.c 2017-10-11 11:14:47.404965456 -0500
@@ -31,9 +31,9 @@ static void extent_trunc(struct inode *i
uint32_t nelen)
{
struct kernel_lb_addr neloc = {};
- int last_block = (elen + inode->i_sb->s_blocksize - 1) >>
+ udf_pblk_t last_block = (elen + inode->i_sb->s_blocksize - 1) >>
inode->i_sb->s_blocksize_bits;
- int first_block = (nelen + inode->i_sb->s_blocksize - 1) >>
+ udf_pblk_t first_block = (nelen + inode->i_sb->s_blocksize - 1) >>
inode->i_sb->s_blocksize_bits;

if (nelen) {
@@ -48,7 +48,7 @@ static void extent_trunc(struct inode *i

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);

diff -uprN a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
--- a/fs/udf/udfdecl.h 2017-10-07 16:46:37.698130278 -0500
+++ b/fs/udf/udfdecl.h 2017-10-11 10:22:31.131668281 -0500
@@ -73,6 +73,8 @@ static inline size_t udf_ext0_offset(str
/* 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(str
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 in
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
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 *,
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