Re: [PATCH 2/2] mm/hugetlb: Fix cow where page writtable in child

On 5/1/21 7:41 AM, Peter Xu wrote:

When fork() and copy hugetlb page range, we'll remember to wrprotect src pte if
needed, however we forget about the child!  Without it, the child will be able
to write to parent's pages when mapped as PROT_READ|PROT_WRITE and MAP_PRIVATE,
which will cause data corruption in the parent process.

This issue can also be exposed by "memfd_test hugetlbfs" kselftest (if it can
pass the F_SEAL_FUTURE_WRITE test first, though).

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 mm/hugetlb.c | 2 ++
 1 file changed, 2 insertions(+)

Reviewed-by: Mike Kravetz <redacted>

I think we need to add, "Fixes: 4eae4efa2c29" as this is now in v5.12
-- 
Mike Kravetz