mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

udf: disallow RW mount without valid integrity descriptor 

Refuse to mount a volume read-write without a coherent Logical Volume
Integrity Descriptor, because we can't generate truly unique IDs without
one.

This fixes a bug where all inodes created on a UDF filesystem following
mount without a coherent LVID are assigned unique ID 0 which can then
confuse other UDF implementations.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Steve Magnani 2019-02-11 08:24:38 -06:00 committed by Jan Kara
parent e8b4274735
commit 4f5edd82eb
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
fs/udf/super.c
View File

@ -1474,6 +1474,17 @@ static int udf_load_logicalvol(struct super_block *sb, sector_t block,
if (lvd->integritySeqExt.extLength)
udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
ret = 0;
if (!sbi->s_lvid_bh) {
/* We can't generate unique IDs without a valid LVID */
if (sb_rdonly(sb)) {
UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
} else {
udf_warn(sb, "Damaged or missing LVID, forcing "
"readonly mount\n");
ret = -EACCES;
}
}
out_bh:
brelse(bh);
return ret;