apfstests/tests/generic/428.out at a6479f7646700f9e8ebb40460c39299db1ebd9f7 - apfstests - ProxGit

apfs/apfstests

mirror of https://github.com/linux-apfs/apfstests.git synced 2026-05-01 15:01:44 -07:00

Files

T

Ross Zwisler bba1b1b2b9 generic: add regression test for stale mmap reads

This adds a regression test for the following kernel patch:

  dax: fix data corruption due to stale mmap reads

The above patch fixes an issue where users of DAX can suffer data
corruption from stale mmap reads via the following sequence:

- open an mmap over a 2MiB hole

- read from a 2MiB hole, faulting in a 2MiB zero page

- write to the hole with write(3p).  The write succeeds but we incorrectly
  leave the 2MiB zero page mapping intact.

- via the mmap, read the data that was just written.  Since the zero page
  mapping is still intact we read back zeroes instead of the new data.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

2017-04-27 12:00:14 +08:00

3 lines

43 B

Plaintext

Raw Blame History

	`QA output created by 428`
	`Silence is golden`