Description: hugetlb: Offset overflow and BUG() in remap_file_pages()
References:
 https://bugzilla.novell.com/show_bug.cgi?id=1084353
Notes:
 carnil> fir 4.15.x fixed in 4.15.14 with e0fdb5385c4bf26b4be60c0042344c315c039aeb
 carnil> SUSE report suggests (if missing, but not checked) to backport as well
 carnil> ff8c0c53c475 and 045c7a3f53d9 where missing.
 bwh> As I read the description of commit 045c7a3f53d9, commit ff8c0c53c475
 bwh> in Linux 4.11 introduced (or exacerbated) this vulnerability -
 bwh> previously if an overflow occurred the mmap operation would fail.
 bwh> So earlier branches have a somewhat different vulnerability.
Bugs:
 https://bugzilla.kernel.org/show_bug.cgi?id=199037
upstream: released (4.16-rc7) [63489f8e821144000e0bdca7e65a8d1cc23a7ee7]
4.9-upstream-stable: released (4.9.144) [3d101f33acb2312ad544106212e0b9ff0d9917f3, 447effd30f9d12f7925595ba9a6ffb01969d6cce]
3.16-upstream-stable: released (3.16.57) [363ed2044f82d8997e9ea8231dc1abeab4993755, 8cca49ea37415645203520bff04309c8a87f7677]
3.2-upstream-stable: released (3.2.102) [4cba2554682469496ff48536d50c399110d20043, 131802b8292d35e8a407469c485565b199ed79cf]
sid: released (4.15.17-1)
4.9-stretch-security: released (4.9.88-1) [bugfix/all/hugetlbfs-fix-offset-overflow-in-hugetlbfs-mmap.patch, bugfix/all/hugetlbfs-check-for-pgoff-value-overflow.patch]
3.16-jessie-security: released (3.16.56-1) [bugfix/all/hugetlbfs-fix-offset-overflow-in-hugetlbfs-mmap.patch, bugfix/all/hugetlbfs-check-for-pgoff-value-overflow.patch]
3.2-wheezy-security: released (3.2.101-1) [bugfix/all/hugetlbfs-fix-offset-overflow-in-hugetlbfs-mmap.patch, bugfix/all/hugetlbfs-check-for-pgoff-value-overflow.patch]