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Subjectmm: use-after-free in collapse_huge_page
Hello,

I've git the following use-after-free in collapse_huge_page while
running syzkaller fuzzer. It is in khugepaged, so not reproducible. On
commit 61c04572de404e52a655a36752e696bbcb483cf5 (Aug 25).

==================================================================
BUG: KASAN: use-after-free in collapse_huge_page+0x28b1/0x3500 at addr
ffff88006c731388
Read of size 8 by task khugepaged/1327
CPU: 0 PID: 1327 Comm: khugepaged Not tainted 4.8.0-rc3+ #33
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff884b8280 ffff88003c207920 ffffffff82d1b239 ffffffff89ec1520
fffffbfff1097050 ffff88003e94c700 ffff88006c731300 ffff88006c7313c0
0000000000000000 ffff88003c207b88 ffff88003c207948 ffffffff817da1fc
Call Trace:
[<ffffffff817da82e>] __asan_report_load8_noabort+0x3e/0x40
mm/kasan/report.c:322
[<ffffffff817ff651>] collapse_huge_page+0x28b1/0x3500 mm/khugepaged.c:1004
[< inline >] khugepaged_scan_pmd mm/khugepaged.c:1205
[< inline >] khugepaged_scan_mm_slot mm/khugepaged.c:1718
[< inline >] khugepaged_do_scan mm/khugepaged.c:1799
[<ffffffff8180206b>] khugepaged+0x1dcb/0x2b30 mm/khugepaged.c:1844
[<ffffffff813e8ddf>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
[<ffffffff86c256cf>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:393
Object at ffff88006c731300, in cache vm_area_struct size: 192
Allocated:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d985d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:582
[<ffffffff817d9d92>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:521
[<ffffffff817d4fcb>] kmem_cache_alloc+0x12b/0x710 mm/slab.c:3573
[< inline >] kmem_cache_zalloc ./include/linux/slab.h:626
[<ffffffff8177d1ed>] mmap_region+0x63d/0xfe0 mm/mmap.c:1486
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Freed:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d9e12>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:555
[< inline >] __cache_free mm/slab.c:3515
[<ffffffff817d6f96>] kmem_cache_free+0x76/0x300 mm/slab.c:3775
[<ffffffff817727a2>] remove_vma+0x162/0x1b0 mm/mmap.c:168
[< inline >] remove_vma_list mm/mmap.c:2286
[<ffffffff81779017>] do_munmap+0x7c7/0xf00 mm/mmap.c:2509
[<ffffffff8177cd02>] mmap_region+0x152/0xfe0 mm/mmap.c:1459
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Memory state around the buggy address:
ffff88006c731280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff88006c731300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88006c731380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff88006c731400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88006c731480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
Disabling lock debugging due to kernel taint
==================================================================
BUG: KASAN: use-after-free in pmdp_collapse_flush+0x146/0x160 at addr
ffff88006c731350
Read of size 8 by task khugepaged/1327
CPU: 0 PID: 1327 Comm: khugepaged Tainted: G B 4.8.0-rc3+ #33
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff884b8280 ffff88003c2078e0 ffffffff82d1b239 ffffffff00000000
fffffbfff1097050 ffff88003e94c700 ffff88006c731300 ffff88006c7313c0
0000000020000000 ffff88003c207b88 ffff88003c207908 ffffffff817da1fc
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff82d1b239>] dump_stack+0x12e/0x185 lib/dump_stack.c:51
[<ffffffff817da1fc>] kasan_object_err+0x1c/0x70 mm/kasan/report.c:154
[< inline >] print_address_description mm/kasan/report.c:192
[<ffffffff817da44e>] kasan_report_error+0x1ae/0x490 mm/kasan/report.c:281
[< inline >] kasan_report mm/kasan/report.c:301
[<ffffffff817da82e>] __asan_report_load8_noabort+0x3e/0x40
mm/kasan/report.c:322
[<ffffffff81799f86>] pmdp_collapse_flush+0x146/0x160 mm/pgtable-generic.c:186
[<ffffffff817fde79>] collapse_huge_page+0x10d9/0x3500 mm/khugepaged.c:1019
[< inline >] khugepaged_scan_pmd mm/khugepaged.c:1205
[< inline >] khugepaged_scan_mm_slot mm/khugepaged.c:1718
[< inline >] khugepaged_do_scan mm/khugepaged.c:1799
[<ffffffff8180206b>] khugepaged+0x1dcb/0x2b30 mm/khugepaged.c:1844
[<ffffffff813e8ddf>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
[<ffffffff86c256cf>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:393
Object at ffff88006c731300, in cache vm_area_struct size: 192
Allocated:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d985d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:582
[<ffffffff817d9d92>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:521
[<ffffffff817d4fcb>] kmem_cache_alloc+0x12b/0x710 mm/slab.c:3573
[< inline >] kmem_cache_zalloc ./include/linux/slab.h:626
[<ffffffff8177d1ed>] mmap_region+0x63d/0xfe0 mm/mmap.c:1486
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Freed:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d9e12>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:555
[< inline >] __cache_free mm/slab.c:3515
[<ffffffff817d6f96>] kmem_cache_free+0x76/0x300 mm/slab.c:3775
[<ffffffff817727a2>] remove_vma+0x162/0x1b0 mm/mmap.c:168
[< inline >] remove_vma_list mm/mmap.c:2286
[<ffffffff81779017>] do_munmap+0x7c7/0xf00 mm/mmap.c:2509
[<ffffffff8177cd02>] mmap_region+0x152/0xfe0 mm/mmap.c:1459
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Memory state around the buggy address:
ffff88006c731200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88006c731280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88006c731300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88006c731380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88006c731400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: use-after-free in pmdp_collapse_flush+0x137/0x160 at addr
ffff88006c731340
Read of size 8 by task khugepaged/1327
CPU: 0 PID: 1327 Comm: khugepaged Tainted: G B 4.8.0-rc3+ #33
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff884b8280 ffff88003c2078e0 ffffffff82d1b239 ffffffff00000000
fffffbfff1097050 ffff88003e94c700 ffff88006c731300 ffff88006c7313c0
0000000020000000 ffff88003c207b88 ffff88003c207908 ffffffff817da1fc
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff82d1b239>] dump_stack+0x12e/0x185 lib/dump_stack.c:51
[<ffffffff817da1fc>] kasan_object_err+0x1c/0x70 mm/kasan/report.c:154
[< inline >] print_address_description mm/kasan/report.c:192
[<ffffffff817da44e>] kasan_report_error+0x1ae/0x490 mm/kasan/report.c:281
[< inline >] kasan_report mm/kasan/report.c:301
[<ffffffff817da82e>] __asan_report_load8_noabort+0x3e/0x40
mm/kasan/report.c:322
[<ffffffff81799f77>] pmdp_collapse_flush+0x137/0x160 mm/pgtable-generic.c:186
[<ffffffff817fde79>] collapse_huge_page+0x10d9/0x3500 mm/khugepaged.c:1019
[< inline >] khugepaged_scan_pmd mm/khugepaged.c:1205
[< inline >] khugepaged_scan_mm_slot mm/khugepaged.c:1718
[< inline >] khugepaged_do_scan mm/khugepaged.c:1799
[<ffffffff8180206b>] khugepaged+0x1dcb/0x2b30 mm/khugepaged.c:1844
[<ffffffff813e8ddf>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
[<ffffffff86c256cf>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:393
Object at ffff88006c731300, in cache vm_area_struct size: 192
Allocated:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d985d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:582
[<ffffffff817d9d92>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:521
[<ffffffff817d4fcb>] kmem_cache_alloc+0x12b/0x710 mm/slab.c:3573
[< inline >] kmem_cache_zalloc ./include/linux/slab.h:626
[<ffffffff8177d1ed>] mmap_region+0x63d/0xfe0 mm/mmap.c:1486
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Freed:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d9e12>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:555
[< inline >] __cache_free mm/slab.c:3515
[<ffffffff817d6f96>] kmem_cache_free+0x76/0x300 mm/slab.c:3775
[<ffffffff817727a2>] remove_vma+0x162/0x1b0 mm/mmap.c:168
[< inline >] remove_vma_list mm/mmap.c:2286
[<ffffffff81779017>] do_munmap+0x7c7/0xf00 mm/mmap.c:2509
[<ffffffff8177cd02>] mmap_region+0x152/0xfe0 mm/mmap.c:1459
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Memory state around the buggy address:
ffff88006c731200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88006c731280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88006c731300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88006c731380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88006c731400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
==================================================================
BUG: KASAN: use-after-free in collapse_huge_page+0x231c/0x3500 at addr
ffff88006c731388
Read of size 8 by task khugepaged/1327
CPU: 0 PID: 1327 Comm: khugepaged Tainted: G B 4.8.0-rc3+ #33
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff884b8280 ffff88003c207920 ffffffff82d1b239 ffffffff00000000
fffffbfff1097050 ffff88003e94c700 ffff88006c731300 ffff88006c7313c0
0000000000000000 ffff88003c207b88 ffff88003c207948 ffffffff817da1fc
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff82d1b239>] dump_stack+0x12e/0x185 lib/dump_stack.c:51
[<ffffffff817da1fc>] kasan_object_err+0x1c/0x70 mm/kasan/report.c:154
[< inline >] print_address_description mm/kasan/report.c:192
[<ffffffff817da44e>] kasan_report_error+0x1ae/0x490 mm/kasan/report.c:281
[< inline >] kasan_report mm/kasan/report.c:301
[<ffffffff817da82e>] __asan_report_load8_noabort+0x3e/0x40
mm/kasan/report.c:322
[<ffffffff817ff0bc>] collapse_huge_page+0x231c/0x3500 mm/khugepaged.c:1038
[< inline >] khugepaged_scan_pmd mm/khugepaged.c:1205
[< inline >] khugepaged_scan_mm_slot mm/khugepaged.c:1718
[< inline >] khugepaged_do_scan mm/khugepaged.c:1799
[<ffffffff8180206b>] khugepaged+0x1dcb/0x2b30 mm/khugepaged.c:1844
[<ffffffff813e8ddf>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
[<ffffffff86c256cf>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:393
Object at ffff88006c731300, in cache vm_area_struct size: 192
Allocated:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d985d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:582
[<ffffffff817d9d92>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:521
[<ffffffff817d4fcb>] kmem_cache_alloc+0x12b/0x710 mm/slab.c:3573
[< inline >] kmem_cache_zalloc ./include/linux/slab.h:626
[<ffffffff8177d1ed>] mmap_region+0x63d/0xfe0 mm/mmap.c:1486
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Freed:
PID = 23069
[<ffffffff8122b7d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:67
[<ffffffff817d95e6>] save_stack+0x46/0xd0 mm/kasan/kasan.c:479
[< inline >] set_track mm/kasan/kasan.c:491
[<ffffffff817d9e12>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:555
[< inline >] __cache_free mm/slab.c:3515
[<ffffffff817d6f96>] kmem_cache_free+0x76/0x300 mm/slab.c:3775
[<ffffffff817727a2>] remove_vma+0x162/0x1b0 mm/mmap.c:168
[< inline >] remove_vma_list mm/mmap.c:2286
[<ffffffff81779017>] do_munmap+0x7c7/0xf00 mm/mmap.c:2509
[<ffffffff8177cd02>] mmap_region+0x152/0xfe0 mm/mmap.c:1459
[<ffffffff8177e52d>] do_mmap+0x99d/0xbf0 mm/mmap.c:1297
[< inline >] do_mmap_pgoff ./include/linux/mm.h:2044
[<ffffffff81722a26>] vm_mmap_pgoff+0x156/0x1a0 mm/util.c:302
[< inline >] SYSC_mmap_pgoff mm/mmap.c:1347
[<ffffffff81777288>] SyS_mmap_pgoff+0x208/0x580 mm/mmap.c:1305
[< inline >] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95
[<ffffffff8120cc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
[<ffffffff86c25480>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
Memory state around the buggy address:
ffff88006c731280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff88006c731300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88006c731380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff88006c731400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88006c731480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================


For the record here is full crash log:
https://gist.githubusercontent.com/dvyukov/9366a1585f95df0251b9310e4fe33bb1/raw/ad635fb9594a733a95cd6f6c82dffa847f62c2ea/gistfile1.txt

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