diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2018-09-01 12:45:04 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-09-01 12:45:04 -0400 |
| commit | bcd8e91f98c156f4b1ebcfacae675f9cfd962441 (patch) | |
| tree | d6a8e8a1d4596f0c559efa1dc4d404d1260dc6a1 /fs | |
| parent | 4d982e25d0bdc83d8c64e66fdeca0b89240b3b85 (diff) | |
ext4: avoid arithemetic overflow that can trigger a BUG
A maliciously crafted file system can cause an overflow when the
results of a 64-bit calculation is stored into a 32-bit length
parameter.
https://bugzilla.kernel.org/show_bug.cgi?id=200623
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Wen Xu <wen.xu@gatech.edu>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/ext4.h | 3 | ||||
| -rw-r--r-- | fs/ext4/inode.c | 8 |
2 files changed, 9 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 249bcee4d7b2..ac05bd86643a 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -686,6 +686,9 @@ enum { /* Max physical block we can address w/o extents */ #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF +/* Max logical block we can support */ +#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF + /* * Structure of an inode on the disk */ diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 8f6ad7667974..694f31364206 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3412,12 +3412,16 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, { struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); unsigned int blkbits = inode->i_blkbits; - unsigned long first_block = offset >> blkbits; - unsigned long last_block = (offset + length - 1) >> blkbits; + unsigned long first_block, last_block; struct ext4_map_blocks map; bool delalloc = false; int ret; + if ((offset >> blkbits) > EXT4_MAX_LOGICAL_BLOCK) + return -EINVAL; + first_block = offset >> blkbits; + last_block = min_t(loff_t, (offset + length - 1) >> blkbits, + EXT4_MAX_LOGICAL_BLOCK); if (flags & IOMAP_REPORT) { if (ext4_has_inline_data(inode)) { |