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author | Jaegeuk Kim <jaegeuk@kernel.org> | 2019-01-09 19:17:14 -0800 |
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committer | Jens Axboe <axboe@kernel.dk> | 2019-01-09 20:51:44 -0700 |
commit | 5db470e229e22b7eda6e23b5566e532c96fb5bc3 (patch) | |
tree | 31e105772718f33a0e7baf9f0e06ac4e5def9b2c /drivers/ata/libahci_platform.c | |
parent | 649d4968860ba708636ad643bd52b28027367042 (diff) | |
download | linux-5db470e229e22b7eda6e23b5566e532c96fb5bc3.tar.bz2 |
loop: drop caches if offset or block_size are changed
If we don't drop caches used in old offset or block_size, we can get old data
from new offset/block_size, which gives unexpected data to user.
For example, Martijn found a loopback bug in the below scenario.
1) LOOP_SET_FD loads first two pages on loop file
2) LOOP_SET_STATUS64 changes the offset on the loop file
3) mount is failed due to the cached pages having wrong superblock
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Reported-by: Martijn Coenen <maco@google.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/ata/libahci_platform.c')
0 files changed, 0 insertions, 0 deletions