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ext4: disallow files with EXT4_JOURNAL_DATA_FL from EXT4_IOC_SWAP_BOOT
authorTheodore Ts'o <tytso@mit.edu>
Mon, 11 Feb 2019 06:07:10 +0000 (01:07 -0500)
committerTheodore Ts'o <tytso@mit.edu>
Mon, 11 Feb 2019 06:07:10 +0000 (01:07 -0500)
commit6e589291f4b1b700ca12baec5930592a0d51e63c
treed6c8cb6b4bcf16c569c3e048296411eab08d0b5dtree
parentabdc644e8cbac2e9b19763680e5a7cf9bab2bee7commit | 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>
fs/ext4/ioctl.c diff | blob | history
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