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udf: Fortify LVID loading 

A user has reported an oops in udf_statfs() that was caused by
numOfPartitions entry in LVID structure being corrupted. Fix the problem
by verifying whether numOfPartitions makes sense at least to the extent
that LVID fits into a single block as it should.

Reported-by: Juergen Weigert <jw@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2013-09-12 22:00:15 +02:00
parent d8524ae9d6
commit 69d75671d9
3 changed files with 48 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/udf/ialloc.c
View File

@ -30,18 +30,17 @@ void udf_free_inode(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct udf_sb_info *sbi = UDF_SB(sb);
struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
mutex_lock(&sbi->s_alloc_mutex);
if (sbi->s_lvid_bh) {
struct logicalVolIntegrityDescImpUse *lvidiu =
udf_sb_lvidiu(sbi);
if (lvidiu) {
mutex_lock(&sbi->s_alloc_mutex);
if (S_ISDIR(inode->i_mode))
le32_add_cpu(&lvidiu->numDirs, -1);
else
le32_add_cpu(&lvidiu->numFiles, -1);
udf_updated_lvid(sb);
mutex_unlock(&sbi->s_alloc_mutex);
}
mutex_unlock(&sbi->s_alloc_mutex);
udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);
}
@ -55,6 +54,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err)
uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
struct udf_inode_info *iinfo;
struct udf_inode_info *dinfo = UDF_I(dir);
struct logicalVolIntegrityDescImpUse *lvidiu;
inode = new_inode(sb);
@ -92,12 +92,10 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err)
return NULL;
}
if (sbi->s_lvid_bh) {
struct logicalVolIntegrityDescImpUse *lvidiu;
lvidiu = udf_sb_lvidiu(sb);
if (lvidiu) {
iinfo->i_unique = lvid_get_unique_id(sb);
mutex_lock(&sbi->s_alloc_mutex);
lvidiu = udf_sb_lvidiu(sbi);
if (S_ISDIR(mode))
le32_add_cpu(&lvidiu->numDirs, 1);
else

64
fs/udf/super.c
View File

@ -94,13 +94,25 @@ static unsigned int udf_count_free(struct super_block *);
static int udf_statfs(struct dentry *, struct kstatfs *);
static int udf_show_options(struct seq_file *, struct dentry *);
struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
{
struct logicalVolIntegrityDesc *lvid =
(struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
__u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
__u32 offset = number_of_partitions * 2 *
sizeof(uint32_t)/sizeof(uint8_t);
struct logicalVolIntegrityDesc *lvid;
unsigned int partnum;
unsigned int offset;
if (!UDF_SB(sb)->s_lvid_bh)
return NULL;
lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
partnum = le32_to_cpu(lvid->numOfPartitions);
if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
offsetof(struct logicalVolIntegrityDesc, impUse)) /
(2 * sizeof(uint32_t)) < partnum) {
udf_err(sb, "Logical volume integrity descriptor corrupted "
"(numOfPartitions = %u)!\n", partnum);
return NULL;
}
/* The offset is to skip freeSpaceTable and sizeTable arrays */
offset = partnum * 2 * sizeof(uint32_t);
return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
}
@ -629,9 +641,10 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
struct udf_options uopt;
struct udf_sb_info *sbi = UDF_SB(sb);
int error = 0;
struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
if (sbi->s_lvid_bh) {
int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
if (lvidiu) {
int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
return -EACCES;
}
@ -1905,11 +1918,12 @@ static void udf_open_lvid(struct super_block *sb)
if (!bh)
return;
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
lvidiu = udf_sb_lvidiu(sb);
if (!lvidiu)
return;
mutex_lock(&sbi->s_alloc_mutex);
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
lvidiu = udf_sb_lvidiu(sbi);
lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
@ -1937,10 +1951,12 @@ static void udf_close_lvid(struct super_block *sb)
if (!bh)
return;
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
lvidiu = udf_sb_lvidiu(sb);
if (!lvidiu)
return;
mutex_lock(&sbi->s_alloc_mutex);
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
lvidiu = udf_sb_lvidiu(sbi);
lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
@ -2093,15 +2109,19 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
if (sbi->s_lvid_bh) {
struct logicalVolIntegrityDescImpUse *lvidiu =
udf_sb_lvidiu(sbi);
uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
/* uint16_t maxUDFWriteRev =
le16_to_cpu(lvidiu->maxUDFWriteRev); */
udf_sb_lvidiu(sb);
uint16_t minUDFReadRev;
uint16_t minUDFWriteRev;
if (!lvidiu) {
ret = -EINVAL;
goto error_out;
}
minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
if (minUDFReadRev > UDF_MAX_READ_VERSION) {
udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
le16_to_cpu(lvidiu->minUDFReadRev),
minUDFReadRev,
UDF_MAX_READ_VERSION);
ret = -EINVAL;
goto error_out;
@ -2265,11 +2285,7 @@ static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
struct logicalVolIntegrityDescImpUse *lvidiu;
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
if (sbi->s_lvid_bh != NULL)
lvidiu = udf_sb_lvidiu(sbi);
else
lvidiu = NULL;
lvidiu = udf_sb_lvidiu(sb);
buf->f_type = UDF_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;

2
fs/udf/udf_sb.h
View File

@ -162,7 +162,7 @@ static inline struct udf_sb_info *UDF_SB(struct super_block *sb)
return sb->s_fs_info;
}
struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi);
struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb);
int udf_compute_nr_groups(struct super_block *sb, u32 partition);