Description: mm/mremap: hold the rmap lock in write mode when moving page table entries
References:
 https://bugs.chromium.org/p/project-zero/issues/detail?id=2347
Notes:
Bugs:
upstream: released (5.14-rc1) [97113eb39fa7972722ff490b947d8af023e1f6a2]
5.10-upstream-stable: released (5.10.137) [2613baa3ab2153cc45b175c58700d93f72ef36c4]
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.14.6-1)
5.10-bullseye-security: released (5.10.140-1)
4.19-buster-security: N/A "Vulnerable code not present"