ext4: disallow files with EXT4_JOURNAL_DATA_FL from EXT4_IOC_SWAP_BOOT

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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>

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Theodore Ts'o 2019-02-11 01:07:10 -05:00

parent abdc644e8c

commit 6e589291f4

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fs/ext4/ioctl.c

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