Kirill A. Shutemov f0dbe032d9 mm: avoid setting up anonymous pages into file mapping ... Reading page fault handler code I've noticed that under right circumstances kernel would map anonymous pages into file mappings: if the VMA doesn't have vm_ops->fault() and the VMA wasn't fully populated on ->mmap(), kernel would handle page fault to not populated pte with do_anonymous_page(). Let's change page fault handler to use do_anonymous_page() only on anonymous VMA (->vm_ops == NULL) and make sure that the VMA is not shared. For file mappings without vm_ops->fault() or shred VMA without vm_ops, page fault on pte_none() entry would lead to SIGBUS. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Willy Tarreau <w@1wt.eu> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> (cherry picked from commit 6b7339f4c31ad69c8e9c0b2859276e22cf72176d) Change-Id: I1bb2bd41b5c4686c50172aabe38bcd2adb3744f4		2017-03-02 16:28:10 -07:00
..
backing-dev.c
bootmem.c	mm: sparse: fix usemap allocation above node descriptor section	2016-10-29 23:12:12 +08:00
bounce.c
cleancache.c
compaction.c	cma: fix watermark checking	2013-03-15 17:06:38 -07:00
debug-pagealloc.c
dmapool.c
fadvise.c
failslab.c
filemap.c	fs: introduce inode operation ->update_time	2015-07-13 11:17:49 -07:00
filemap_xip.c	fs: introduce inode operation ->update_time	2015-07-13 11:17:49 -07:00
fremap.c
highmem.c
huge_memory.c
hugetlb.c
hwpoison-inject.c
init-mm.c
internal.h	cma: fix watermark checking	2013-03-15 17:06:38 -07:00
Kconfig
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c	ksm: Provide support to use deferred timers for scanner thread	2016-10-29 23:12:17 +08:00
maccess.c
madvise.c	mm: add a field to store names for private anonymous memory	2013-10-11 10:02:06 -07:00
Makefile
memblock.c
memcontrol.c
memory-failure.c
memory.c	mm: avoid setting up anonymous pages into file mapping	2017-03-02 16:28:10 -07:00
memory_hotplug.c
mempolicy.c	mm: fix anon vma naming	2016-10-29 23:12:35 +08:00
mempool.c
migrate.c
mincore.c
mlock.c	mm: reorder can_do_mlock to fix audit denial	2015-06-16 23:08:46 -07:00
mm_init.c
mmap.c	FROMLIST: mm: mmap: Add new /proc tunable for mmap_base ASLR.	2016-10-29 23:12:40 +08:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c	mm: add a field to store names for private anonymous memory	2013-10-11 10:02:06 -07:00
mremap.c
msync.c
nobootmem.c
nommu.c
oom_kill.c	mm, oom: make dump_tasks public	2014-11-18 15:13:25 -08:00
page-writeback.c	mm: fix calculation of dirtyable memory	2016-10-29 23:12:16 +08:00
page_alloc.c	mm: workaround for widevine playback failed	2013-05-22 07:57:36 +00:00
page_cgroup.c
page_io.c
page_isolation.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
prio_tree.c
process_vm_access.c
quicklist.c
readahead.c	mm: change initial readahead window size calculation	2016-10-29 23:12:18 +08:00
rmap.c
shmem.c
slab.c
slob.c
slub.c	slub: fix a memory leak in get_partial_node()	2013-03-15 17:09:26 -07:00
sparse-vmemmap.c
sparse.c
swap.c
swap_state.c
swapfile.c
thrash.c
truncate.c
util.c	nick kvfree() from apparmor	2014-11-18 15:13:23 -08:00
vmalloc.c
vmscan.c	mm: vmscan: clear kswapd's special reclaim powers before exiting	2016-10-29 23:12:33 +08:00
vmstat.c