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Subjectmm: compaction: buffer overflow in isolate_migratepages_range
Hi all,

While fuzzing with trinity inside a KVM tools guest running the latest -next
kernel with the KASAN patchset, I've stumbled on the following spew:


[ 3837.070452] ==================================================================
[ 3837.073101] AddressSanitizer: buffer overflow in isolate_migratepages_range+0x85f/0xd90 at addr ffff88051b70eb49
[ 3837.076310] page:ffffea00146dc380 count:0 mapcount:0 mapping: (null) index:0x0
[ 3837.079876] page flags: 0xafffff80008000(tail)
[ 3837.114592] page dumped because: kasan error
[ 3837.115897] CPU: 4 PID: 29613 Comm: trinity-c467 Not tainted 3.16.0-next-20140808-sasha-00051-gf368221 #1051
[ 3837.118024] 00000000000000fc 0000000000000000 ffffea00146dc380 ffff8801f326f718
[ 3837.119837] ffffffff97e0d344 ffff8801f326f7e8 ffff8801f326f7d8 ffffffff9342d5bc
[ 3837.121708] ffffea00085163c0 0000000000000000 ffff8801f326f8e0 ffffffff93fe02fb
[ 3837.123704] Call Trace:
[ 3837.124272] dump_stack (lib/dump_stack.c:52)
[ 3837.125166] kasan_report_error (mm/kasan/report.c:98 mm/kasan/report.c:166)
[ 3837.126128] ? trace_hardirqs_on_thunk (arch/x86/lib/thunk_64.S:33)
[ 3837.127462] ? retint_restore_args (arch/x86/kernel/entry_64.S:828)
[ 3837.128753] __asan_load8 (mm/kasan/kasan.c:364)
[ 3837.129914] ? isolate_migratepages_range (./arch/x86/include/asm/bitops.h:311 include/linux/pagemap.h:70 include/linux/balloon_compaction.h:131 include/linux/balloon_compaction.h:156 mm/compaction.c:596)
[ 3837.131613] isolate_migratepages_range (./arch/x86/include/asm/bitops.h:311 include/linux/pagemap.h:70 include/linux/balloon_compaction.h:131 include/linux/balloon_compaction.h:156 mm/compaction.c:596)
[ 3837.132838] compact_zone (mm/compaction.c:877 mm/compaction.c:1044)
[ 3837.133818] compact_zone_order (mm/compaction.c:1106)
[ 3837.134982] try_to_compact_pages (mm/compaction.c:1161)
[ 3837.135970] __alloc_pages_direct_compact (mm/page_alloc.c:2313)
[ 3837.137217] ? next_zones_zonelist (mm/mmzone.c:72)
[ 3837.138861] __alloc_pages_nodemask (mm/page_alloc.c:2640 mm/page_alloc.c:2806)
[ 3837.139897] ? check_chain_key (kernel/locking/lockdep.c:2190)
[ 3837.141220] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63)
[ 3837.142434] alloc_pages_vma (mm/mempolicy.c:2046)
[ 3837.143479] ? do_huge_pmd_wp_page (mm/huge_memory.c:774 mm/huge_memory.c:1123)
[ 3837.144663] do_huge_pmd_wp_page (mm/huge_memory.c:774 mm/huge_memory.c:1123)
[ 3837.145653] handle_mm_fault (mm/memory.c:3312 mm/memory.c:3370)
[ 3837.146717] ? vmacache_find (mm/vmacache.c:100 (discriminator 1))
[ 3837.147404] ? find_vma (mm/mmap.c:2024)
[ 3837.147982] __do_page_fault (arch/x86/mm/fault.c:1231)
[ 3837.148613] ? context_tracking_user_exit (kernel/context_tracking.c:184)
[ 3837.149388] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63)
[ 3837.150212] ? trace_hardirqs_off_caller (kernel/locking/lockdep.c:2641 (discriminator 8))
[ 3837.150977] ? trace_hardirqs_off (kernel/locking/lockdep.c:2647)
[ 3837.151686] trace_do_page_fault (arch/x86/mm/fault.c:1314 include/linux/jump_label.h:115 include/linux/context_tracking_state.h:27 include/linux/context_tracking.h:45 arch/x86/mm/fault.c:1315)
[ 3837.152870] do_async_page_fault (arch/x86/kernel/kvm.c:279)
[ 3837.153886] async_page_fault (arch/x86/kernel/entry_64.S:1313)
[ 3837.155293] Read of size 8 by thread T29613:
[ 3837.156058] Memory state around the buggy address:
[ 3837.156885] ffff88051b70e880: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
[ 3837.158141] ffff88051b70e900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 3837.159492] ffff88051b70e980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 3837.160863] ffff88051b70ea00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 3837.162165] ffff88051b70ea80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
[ 3837.163552] >ffff88051b70eb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 3837.164866] ^
[ 3837.165914] ffff88051b70eb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 3837.167317] ffff88051b70ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 3837.168616] ffff88051b70ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 3837.169898] ffff88051b70ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 3837.171298] ffff88051b70ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 3837.172611] ==================================================================


Thanks,
Sasha


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