Linus Torvalds 6b3a707736 Merge branch 'page-refs' (page ref overflow) ... Merge page ref overflow branch. Jann Horn reported that he can overflow the page ref count with sufficient memory (and a filesystem that is intentionally extremely slow). Admittedly it's not exactly easy. To have more than four billion references to a page requires a minimum of 32GB of kernel memory just for the pointers to the pages, much less any metadata to keep track of those pointers. Jann needed a total of 140GB of memory and a specially crafted filesystem that leaves all reads pending (in order to not ever free the page references and just keep adding more). Still, we have a fairly straightforward way to limit the two obvious user-controllable sources of page references: direct-IO like page references gotten through get_user_pages(), and the splice pipe page duplication. So let's just do that. * branch page-refs: fs: prevent page refcount overflow in pipe_buf_get mm: prevent get_user_pages() from overflowing page refcount mm: add 'try_get_page()' helper function mm: make page ref count overflow check tighter and more explicit		2019-04-14 15:09:40 -07:00
..
kasan
backing-dev.c
balloon_compaction.c
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c	mm/compaction.c: abort search if isolation fails	2019-04-04 11:56:15 +01:00
debug_page_ref.c
debug.c	mm/debug.c: fix __dump_page when mapping->host is not set	2019-03-29 10:01:37 -07:00
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c
frame_vector.c
frontswap.c
gup_benchmark.c
gup.c	Merge branch 'page-refs' (page ref overflow)	2019-04-14 15:09:40 -07:00
highmem.c
hmm.c
huge_memory.c	mm/huge_memory.c: fix modifying of page protection by insert_pfn_pmd()	2019-04-05 16:02:31 -10:00
hugetlb_cgroup.c
hugetlb.c	Merge branch 'page-refs' (page ref overflow)	2019-04-14 15:09:40 -07:00
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
Kconfig
Kconfig.debug
khugepaged.c
kmemleak-test.c
kmemleak.c	kmemleak: powerpc: skip scanning holes in the .bss section	2019-04-05 16:02:30 -10:00
ksm.c
list_lru.c
maccess.c
madvise.c
Makefile
memblock.c
memcontrol.c	mm: writeback: use exact memcg dirty counts	2019-04-05 16:02:31 -10:00
memfd.c
memory_hotplug.c	mm/memory_hotplug.c: fix notification in offline error path	2019-03-29 10:01:37 -07:00
memory-failure.c
memory.c
mempolicy.c	mm: mempolicy: make mbind() return -EIO when MPOL_MF_STRICT is specified	2019-03-29 10:01:37 -07:00
mempool.c
memtest.c
migrate.c	mm/migrate.c: add missing flush_dcache_page for non-mapped page migrate	2019-03-29 10:01:37 -07:00
mincore.c
mlock.c
mm_init.c
mmap.c
mmu_context.c
mmu_gather.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c
oom_kill.c
page_alloc.c	mm/hotplug: fix offline undo_isolate_page_range()	2019-03-29 10:01:37 -07:00
page_counter.c
page_ext.c
page_idle.c
page_io.c
page_isolation.c	mm/page_isolation.c: fix a wrong flag in set_migratetype_isolate()	2019-03-29 10:01:37 -07:00
page_owner.c
page_poison.c
page_vma_mapped.c
page-writeback.c
pagewalk.c
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c
rodata_test.c
shmem.c
slab_common.c	mm: add support for kmem caches in DMA32 zone	2019-03-29 10:01:37 -07:00
slab.c	slab: fix a crash by reading /proc/slab_allocators	2019-04-07 19:23:12 -10:00
slab.h	mm: add support for kmem caches in DMA32 zone	2019-03-29 10:01:37 -07:00
slob.c
slub.c	mm: add support for kmem caches in DMA32 zone	2019-03-29 10:01:37 -07:00
sparse-vmemmap.c
sparse.c	mm/hotplug: fix offline undo_isolate_page_range()	2019-03-29 10:01:37 -07:00
swap_cgroup.c
swap_slots.c
swap_state.c
swap.c
swapfile.c
truncate.c
usercopy.c
userfaultfd.c
util.c	mm/util.c: fix strndup_user() comment	2019-04-05 16:02:31 -10:00
vmacache.c
vmalloc.c
vmpressure.c
vmscan.c
vmstat.c
workingset.c
z3fold.c
zbud.c
zpool.c
zsmalloc.c
zswap.c