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Subject[PATCH v2 0/2] mm/hugetlb: fix write-fault handling for shared mappings
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I observed that hugetlb does not support/expect write-faults in shared
mappings that would have to map the R/O-mapped page writable -- and I
found two case where we could currently get such faults and would
erroneously map an anon page into a shared mapping.

Reproducers part of the patches.

I propose to backport both fixes to stable trees. The first fix needs
a small adjustment.

v1 -> v2:
- "mm/hugetlb: fix hugetlb not supporting softdirty tracking"
-> Restrict to softdirty tracking
- "mm/hugetlb: support write-faults in shared mappings"
-> Add reproducer and adjust description
-> Move VM_WRITE sanity check out from MAYSHARE handling

David Hildenbrand (2):
mm/hugetlb: fix hugetlb not supporting softdirty tracking
mm/hugetlb: support write-faults in shared mappings

mm/hugetlb.c | 26 +++++++++++++++++++-------
mm/mmap.c | 7 +++++--
2 files changed, 24 insertions(+), 9 deletions(-)


base-commit: ffcf9c5700e49c0aee42dcba9a12ba21338e8136
--
2.35.3

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