diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2009-02-17 10:58:41 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-20 14:37:19 -0800 |
| commit | d5f85db686df375bd39168bd0032c4be6863f35c (patch) | |
| tree | 993d1700e81997cb1058cf094d890f51975842db /fs | |
| parent | 235cda408948bb340b37340056e55ca13bd3137f (diff) | |
ext4: only use i_size_high for regular files
(cherry picked from commit 06a279d636734da32bb62dd2f7b0ade666f65d7c)
Directories are not allowed to be bigger than 2GB, so don't use
i_size_high for anything other than regular files. E2fsck should
complain about these inodes, but the simplest thing to do for the
kernel is to only use i_size_high for regular files.
This prevents an intentially corrupted filesystem from causing the
kernel to burn a huge amount of CPU and issuing error messages such
as:
EXT4-fs warning (device loop0): ext4_block_to_path: block 135090028 > max
Thanks to David Maciejak from Fortinet's FortiGuard Global Security
Research Team for reporting this issue.
http://bugzilla.kernel.org/show_bug.cgi?id=12375
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/ext4.h | 7 | ||||
| -rw-r--r-- | fs/ext4/inode.c | 4 |
2 files changed, 7 insertions, 4 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 2f7b639e7da2..85f58aff9f0b 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1174,8 +1174,11 @@ static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, static inline loff_t ext4_isize(struct ext4_inode *raw_inode) { - return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | - le32_to_cpu(raw_inode->i_size_lo); + if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) + return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | + le32_to_cpu(raw_inode->i_size_lo); + else + return (loff_t) le32_to_cpu(raw_inode->i_size_lo); } static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 36168457d5af..6e7f085bd401 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -351,9 +351,9 @@ static int ext4_block_to_path(struct inode *inode, final = ptrs; } else { ext4_warning(inode->i_sb, "ext4_block_to_path", - "block %lu > max", + "block %lu > max in inode %lu", i_block + direct_blocks + - indirect_blocks + double_blocks); + indirect_blocks + double_blocks, inode->i_ino); } if (boundary) *boundary = final - 1 - (i_block & (ptrs - 1)); |