Unverified Commit 4bcac70a authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!4369 mm/filemap: avoid buffered read/write race to read inconsistent data 

Merge Pull Request from: @ci-robot 
 
PR sync from: Baokun Li <libaokun1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/4A7AT3IUGL7457RSHJRTGRIINJGDPVWR/ 
 
https://gitee.com/src-openeuler/kernel/issues/I8RRAT 
 
Link:https://gitee.com/openeuler/kernel/pulls/4369

 

Reviewed-by: default avatarLiu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: default avatarZhang Changzhong <zhangchangzhong@huawei.com>
parents 0ec2c5ee 6927b17e

mm/filemap.c

+9 −0
Original line number Diff line number Diff line
@@ -2273,6 +2273,15 @@ static ssize_t generic_file_buffered_read(struct kiocb *iocb, 
		}

		nr = nr - offset;



		/*

		 * Pairs with a barrier in

		 * block_write_end()->mark_buffer_dirty() or other page

		 * dirtying routines like iomap_write_end() to ensure

		 * changes to page contents are visible before we see

		 * increased inode size.

		 */

		smp_rmb();



		/* If users can be writing to this page using arbitrary

		 * virtual addresses, take care about potential aliasing

		 * before reading the page on the kernel side.