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authorTheodore Ts'o <tytso@mit.edu>2019-02-11 01:07:10 -0500
committerTheodore Ts'o <tytso@mit.edu>2019-02-11 01:07:10 -0500
commit6e589291f4b1b700ca12baec5930592a0d51e63c (patch)
treed6c8cb6b4bcf16c569c3e048296411eab08d0b5d /fs/ext4
parentabdc644e8cbac2e9b19763680e5a7cf9bab2bee7 (diff)
ext4: disallow files with EXT4_JOURNAL_DATA_FL from EXT4_IOC_SWAP_BOOT
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>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/ioctl.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 2e76fb55d94a..eb8ca8d80885 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;