Bug 1959192 - Fix memfd_test failure on hugetlbfs (F_SEAL_FUTURE_WRITE fix; copy-on-write data corrupt)
Summary: Fix memfd_test failure on hugetlbfs (F_SEAL_FUTURE_WRITE fix; copy-on-write d...
Keywords:
Status: CLOSED NEXTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: kernel
Version: 9.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: beta
: 9.0
Assignee: Peter Xu
QA Contact: Li Wang
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-05-10 21:35 UTC by Peter Xu
Modified: 2023-08-08 03:05 UTC (History)
7 users (show)

Fixed In Version:
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Last Closed: 2021-11-17 21:01:29 UTC
Type: Bug
Target Upstream Version:
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Description Peter Xu 2021-05-10 21:35:45 UTC 
memfd_test fails for rhel9:

# uname -r
5.12.0-1.el9.x86_64
# ./memfd_test hugetlbfs
memfd-hugetlb: CREATE
memfd-hugetlb: BASIC
memfd-hugetlb: SEAL-WRITE
memfd-hugetlb: SEAL-FUTURE-WRITE
mmap() didn't fail as expected
Aborted (core dumped)

We need to make sure we'll get below fixes into rhel9 by either rebase or backport:

https://lore.kernel.org/lkml/20210503234356.9097-1-peterx@redhat.com/

The 1st patch is less important as it fixes F_SEAL_FUTURE_WRITE which may not have a huge lot of users, however good to have.  The 2nd fix is more important as it could cause data corruption.
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