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| author | Steve Magnani <steve.magnani@digidescorp.com> | 2017-10-12 15:48:40 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-10-17 11:56:45 +0200 |
| commit | b490bdd630cc43a5725e76c7c23f8a7e55551145 (patch) | |
| tree | 9ee95e0af7d247b2a8b282b2b5ed1a783465e9da /fs/udf/directory.c | |
| parent | udf: Remove some outdate references from documentation (diff) | |
| download | linux-b490bdd630cc43a5725e76c7c23f8a7e55551145.tar.xz linux-b490bdd630cc43a5725e76c7c23f8a7e55551145.zip | |
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>
Diffstat (limited to 'fs/udf/directory.c')
| -rw-r--r-- | fs/udf/directory.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/udf/directory.c b/fs/udf/directory.c index 7aa48bd7cbaf..c41c3cc8e5c6 100644 --- a/fs/udf/directory.c +++ b/fs/udf/directory.c @@ -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); |