android_kernel_samsung_msm8976/mm
Toshi Kani 7fb0c52e66 mm/memory_hotplug.c: check start_pfn in test_pages_in_a_zone()
commit deb88a2a19e85842d79ba96b05031739ec327ff4 upstream.

Patch series "fix a kernel oops when reading sysfs valid_zones", v2.

A sysfs memory file is created for each 2GiB memory block on x86-64 when
the system has 64GiB or more memory.  [1] When the start address of a
memory block is not backed by struct page, i.e.  a memory range is not
aligned by 2GiB, reading its 'valid_zones' attribute file leads to a
kernel oops.  This issue was observed on multiple x86-64 systems with
more than 64GiB of memory.  This patch-set fixes this issue.

Patch 1 first fixes an issue in test_pages_in_a_zone(), which does not
test the start section.

Patch 2 then fixes the kernel oops by extending test_pages_in_a_zone()
to return valid [start, end).

Note for stable kernels: The memory block size change was made by commit
bdee237c0343 ("x86: mm: Use 2GB memory block size on large-memory x86-64
systems"), which was accepted to 3.9.  However, this patch-set depends
on (and fixes) the change to test_pages_in_a_zone() made by commit
5f0f2887f4de ("mm/memory_hotplug.c: check for missing sections in
test_pages_in_a_zone()"), which was accepted to 4.4.

So, I recommend that we backport it up to 4.4.

[1] 'Commit bdee237c0343 ("x86: mm: Use 2GB memory block size on
    large-memory x86-64 systems")'

This patch (of 2):

test_pages_in_a_zone() does not check 'start_pfn' when it is aligned by
section since 'sec_end_pfn' is set equal to 'pfn'.  Since this function
is called for testing the range of a sysfs memory file, 'start_pfn' is
always aligned by section.

Fix it by properly setting 'sec_end_pfn' to the next section pfn.

Also make sure that this function returns 1 only when the range belongs
to a zone.

Link: http://lkml.kernel.org/r/20170127222149.30893-2-toshi.kani@hpe.com
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Andrew Banman <abanman@sgi.com>
Cc: Reza Arbab <arbab@linux.vnet.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
2019-07-27 21:43:51 +02:00
..
kasan kasan, module, vmalloc: rework shadow allocation for modules 2015-05-04 14:03:58 -07:00
backing-dev.c
balloon_compaction.c
bootmem.c
bounce.c
cleancache.c
compaction.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
debug-pagealloc.c mm/debug-pagealloc.c: print page physical address for 2015-08-23 23:19:22 -07:00
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
filemap_xip.c
fremap.c
frontswap.c mm: frontswap: invalidate expired data on a dup-store failure 2014-12-16 09:09:41 -08:00
highmem.c
huge_memory.c mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp 2019-07-27 21:43:25 +02:00
hugetlb.c mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault 2015-10-22 14:37:50 -07:00
hugetlb_cgroup.c
hwpoison-inject.c
init-mm.c
internal.h mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
interval_tree.c
Kconfig Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
Kconfig.debug defconfig: 8994: enable CONFIG_DEBUG_SLUB_PANIC_ON 2014-10-21 14:00:18 -07:00
kmemcheck.c
kmemleak-test.c
kmemleak.c mm: kmemleak: allow safe memory scanning during kmemleak disabling 2015-06-22 10:47:32 +05:30
ksm.c mm,ksm: fix endless looping in allocating memory when ksm enable 2019-07-27 21:42:51 +02:00
maccess.c
madvise.c
Makefile BACKPORT: mm/zpool: implement common zpool api to zbud/zsmalloc 2016-05-18 14:35:03 +05:30
memblock.c
memcontrol.c UPSTREAM: memcg: Only free spare array when readers are done 2016-05-18 14:36:06 +05:30
memory-failure.c This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
memory.c mm: thp: fix SMP race condition between THP page fault and MADV_DONTNEED 2019-07-27 21:42:02 +02:00
memory_hotplug.c mm/memory_hotplug.c: check start_pfn in test_pages_in_a_zone() 2019-07-27 21:43:51 +02:00
mempolicy.c mm/mempolicy.c: fix error handling in set_mempolicy and mbind. 2017-04-22 23:02:48 +02:00
mempool.c
memtest.c memtest: use phys_addr_t for physical addresses 2015-04-01 09:27:43 -07:00
migrate.c squash mm: Export migrate_page_... : also make it non-static 2019-07-27 21:42:00 +02:00
mincore.c
mlock.c mm: reorder can_do_mlock to fix audit denial 2015-09-16 18:20:13 +05:30
mm_init.c
mmap.c fs: Remove Samsung implementation of sdcardfs 2018-02-06 13:12:17 +01:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nobootmem.c
nommu.c This is the 3.10.73 stable release 2015-04-24 18:14:57 -07:00
oom_kill.c This is the 3.10.67 stable release 2015-04-24 18:04:40 -07:00
page-writeback.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_alloc.c mm/init: fix zone boundary creation 2019-07-27 21:43:22 +02:00
page_cgroup.c cgroup/kmemleak: add kmemleak_free() for cgroup deallocations. 2014-11-14 08:47:59 -08:00
page_io.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_isolation.c mm/page_alloc: Call kernel_map_pages in unset_migrateype_isolate 2015-03-19 11:34:36 -07:00
pageowner.c
pagewalk.c mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range 2015-02-11 14:48:16 +08:00
percpu-km.c
percpu-vm.c percpu: perform tlb flush after pcpu_map_pages() failure 2014-10-05 14:54:13 -07:00
percpu.c Revert "percpu: free percpu allocation info for uniprocessor system" 2014-11-14 08:47:53 -08:00
pgtable-generic.c
process_reclaim.c lowmemorykiller: Introduce sysfs node for ALMK and PPR adj threshold 2016-07-06 23:07:02 -07:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-02-25 11:57:47 -08:00
quicklist.c
readahead.c
rmap.c mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
shmem.c tmpfs: fix regression hang in fallocate undo 2019-07-27 21:41:47 +02:00
showmem.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
slab.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
slab.h
slab_common.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
slob.c
slub.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
sparse-vmemmap.c
sparse.c
swap.c
swap_state.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
swapfile.c swapfile: fix memory corruption via malformed swapfile 2019-07-27 21:42:14 +02:00
truncate.c mm: Remove false WARN_ON from pagecache_isize_extended() 2014-11-14 08:48:00 -08:00
util.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmpressure.c mm: vmpressure: account allocstalls only on higher pressures 2015-08-25 18:34:09 -07:00
vmscan.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmstat.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zbud.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zpool.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zsmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zswap.c Import latest Samsung release 2017-04-18 03:43:52 +02:00