Damien Le Moal 350d66d9e7 zonefs: Detect append writes at invalid locations ... commit a608da3bd7 upstream. Using REQ_OP_ZONE_APPEND operations for synchronous writes to sequential files succeeds regardless of the zone write pointer position, as long as the target zone is not full. This means that if an external (buggy) application writes to the zone of a sequential file underneath the file system, subsequent file write() operation will succeed but the file size will not be correct and the file will contain invalid data written by another application. Modify zonefs_file_dio_append() to check the written sector of an append write (returned in bio->bi_iter.bi_sector) and return -EIO if there is a mismatch with the file zone wp offset field. This change triggers a call to zonefs_io_error() and a zone check. Modify zonefs_io_error_cb() to not expose the unexpected data after the current inode size when the errors=remount-ro mode is used. Other error modes are correctly handled already. Fixes: 02ef12a663 ("zonefs: use REQ_OP_ZONE_APPEND for sync DIO") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-01-24 07:22:42 +01:00
..
Kconfig	zonefs: select CONFIG_CRC32	2021-01-04 09:06:42 +09:00
Makefile	zonefs: add tracepoints for file operations	2021-02-16 09:59:54 +09:00
super.c	zonefs: Detect append writes at invalid locations	2023-01-24 07:22:42 +01:00
trace.h	zonefs: add tracepoints for file operations	2021-02-16 09:59:54 +09:00
zonefs.h	zonefs: Convert to using invalidate_lock	2021-07-13 14:29:01 +02:00