Steve Sistare 26a8ea8092 mm/hugetlb: fix memfd_pin_folios resv_huge_pages leak ... memfd_pin_folios followed by unpin_folios leaves resv_huge_pages elevated if the pages were not already faulted in. During a normal page fault, resv_huge_pages is consumed here: hugetlb_fault() alloc_hugetlb_folio() dequeue_hugetlb_folio_vma() dequeue_hugetlb_folio_nodemask() dequeue_hugetlb_folio_node_exact() free_huge_pages-- resv_huge_pages-- During memfd_pin_folios, the page is created by calling alloc_hugetlb_folio_nodemask instead of alloc_hugetlb_folio, and resv_huge_pages is not modified: memfd_alloc_folio() alloc_hugetlb_folio_nodemask() dequeue_hugetlb_folio_nodemask() dequeue_hugetlb_folio_node_exact() free_huge_pages-- alloc_hugetlb_folio_nodemask has other callers that must not modify resv_huge_pages. Therefore, to fix, define an alternate version of alloc_hugetlb_folio_nodemask for this call site that adjusts resv_huge_pages. Link: https://lkml.kernel.org/r/1725373521-451395-4-git-send-email-steven.sistare@oracle.com Fixes: 89c1905d9c ("mm/gup: introduce memfd_pin_folios() for pinning memfd folios") Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Acked-by: Vivek Kasireddy <vivek.kasireddy@intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Peter Xu <peterx@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2024-09-26 14:01:43 -07:00
..
acpi
asm-generic
clocksource
crypto
drm
dt-bindings	The core clk framework is left largely untouched this time around except for	2024-09-23 15:01:48 -07:00
keys
kunit	The core clk framework is left largely untouched this time around except for	2024-09-23 15:01:48 -07:00
kvm
linux	mm/hugetlb: fix memfd_pin_folios resv_huge_pages leak	2024-09-26 14:01:43 -07:00
math-emu
media
memory
misc
net
pcmcia
ras
rdma
rv
scsi
soc
sound
target
trace
uapi	media updates for v6.12-rc1	2024-09-23 15:27:58 -07:00
ufs
vdso
video
xen