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Description: "Dirty COW" variant on transparent huge pages
References:
http://www.openwall.com/lists/oss-security/2017/11/30/1
https://github.com/bindecy/HugeDirtyCowPOC
Notes:
carnil> The upstream commit 8310d48b125d19fcd9521d83b8293e63eb1646aa
carnil> allows the race condition, and was backported to 3.2.87,
carnil> 3.16.42 and 4.9.7.
bwh> But in 3.2 dirty bits didn't work on s390, so the backported version of
bwh> can_follow_write_pmd() doesn't use them.
Bugs:
upstream: released (4.15-rc2) [a8f97366452ed491d13cf1e44241bc0b5740b1f0]
4.9-upstream-stable: released (4.9.67) [7031ae2ab37d3df53c4a4e9903329a5d38c745ec]
3.16-upstream-stable: released (3.16.52) [ec041ea68228f2d025e2fa1b5c90a801605d063b]
3.2-upstream-stable: N/A "Vulnerable code not present"
sid: released (4.14.2-1) [bugfix/all/mm-thp-Do-not-make-page-table-dirty-unconditionally-.patch]
4.9-stretch-security: released (4.9.65-1)
3.16-jessie-security: released (3.16.51-1)
3.2-wheezy-security: N/A "Vulnerable code not present"
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