| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 044/100] ext4: disallow files with EXT4_JOURNAL_DATA_FL from EXT4_IOC_SWAP_BOOT | Date | Fri, 18 Oct 2019 18:04:29 -0400 |
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From: Theodore Ts'o <tytso@mit.edu>
[ Upstream commit 6e589291f4b1b700ca12baec5930592a0d51e63c ]
A malicious/clueless root user can use EXT4_IOC_SWAP_BOOT to force a corner casew which can lead to the file system getting corrupted. There's no usefulness to allowing this, so just prohibit this case.
Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/ext4/ioctl.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index abb6fcff0a1d3..783c54bb2ce75 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -132,6 +132,7 @@ static long swap_inode_boot_loader(struct super_block *sb, if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) || IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) || + (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) || ext4_has_inline_data(inode)) { err = -EINVAL; goto journal_err_out; -- 2.20.1
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