diff options
| author | Jan Kara <jack@suse.cz> | 2017-05-26 17:45:45 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-12 11:51:26 +0200 |
| commit | 2d605d9188d64e7d2bd96b4ec5bf91434024a25a (patch) | |
| tree | 4177f7a4f531c22a18fc736226e763d7215da847 /include/linux/fpga/fpga-mgr.h | |
| parent | 27db1f020373a0681d483cc2d304e018cbd15723 (diff) | |
ext4: fix data corruption for mmap writes
commit a056bdaae7a181f7dcc876cfab2f94538e508709 upstream.
mpage_submit_page() can race with another process growing i_size and
writing data via mmap to the written-back page. As mpage_submit_page()
samples i_size too early, it may happen that ext4_bio_write_page()
zeroes out too large tail of the page and thus corrupts user data.
Fix the problem by sampling i_size only after the page has been
write-protected in page tables by clear_page_dirty_for_io() call.
Reported-by: Michael Zimmer <michael@swarm64.com>
Fixes: cb20d5188366f04d96d2e07b1240cc92170ade40
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions