Date:   Sun, 08 Apr 2018 15:30:00 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 199321] New: use-after-free in
 jbd2_journal_commit_transaction() when mounting and operating a crafted ext4
 image

https://bugzilla.kernel.org/show_bug.cgi?id=199321

            Bug ID: 199321
           Summary: use-after-free in jbd2_journal_commit_transaction()
                    when mounting and operating a crafted ext4 image
           Product: File System
           Version: 2.5
    Kernel Version: 4.15.x
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: wen.xu@...ech.edu
        Regression: No

Created attachment 275165
  --> https://bugzilla.kernel.org/attachment.cgi?id=275165&action=edit
The crafted image which causes kernel panic

- Overview
Use-after-free triggered in jbd2_journal_commit_transaction() when mounting and
operating a crafted ext4 image

- Reproduce
# mkdir mnt
# mount -t ext4 205.img mnt
# gcc -o poc poc.c
# ./poc ./mnt
Kernel crash can be observed in jbd2_journal_put_journal_head().

- Crash dump (with KASAN information)

[  546.558947]
==================================================================
[  546.559046] BUG: KASAN: use-after-free in
jbd2_journal_commit_transaction+0x2dc3/0x3bd0
[  546.559123] Read of size 8 at addr ffff8800b05189d8 by task
jbd2/loop0-8/1489

[  546.559222] CPU: 3 PID: 1489 Comm: jbd2/loop0-8 Not tainted 4.15.15 #1
[  546.559223] Hardware name: VMware, Inc. VMware Virtual Platform/440BX
Desktop Reference Platform, BIOS 6.00 07/02/2015
[  546.559225] Call Trace:
[  546.559239]  dump_stack+0xaf/0x121
[  546.559242]  ? _atomic_dec_and_lock+0xff/0xff
[  546.559250]  print_address_description+0x6a/0x270
[  546.559252]  kasan_report+0x277/0x360
[  546.559254]  ? jbd2_journal_commit_transaction+0x2dc3/0x3bd0
[  546.559256]  jbd2_journal_commit_transaction+0x2dc3/0x3bd0
[  546.559263]  ? update_load_avg+0xb81/0x1130
[  546.559267]  ? journal_submit_commit_record+0x4a0/0x4a0
[  546.559273]  ? update_load_avg+0xb81/0x1130
[  546.559278]  ? cpuusage_read+0x10/0x10
[  546.559281]  ? update_curr+0x300/0x430
[  546.559283]  ? switched_from_fair+0x10/0x10
[  546.559285]  ? update_cfs_group+0x84/0x2a0
[  546.559286]  ? account_entity_dequeue+0xdb/0x2b0
[  546.559288]  ? reweight_entity+0x660/0x660
[  546.559291]  ? dequeue_entity+0x302/0xa30
[  546.559294]  ? check_preempt_wakeup+0x4c0/0x500
[  546.559297]  ? task_prio+0x20/0x20
[  546.559299]  ? select_idle_sibling+0xca/0x7b0
[  546.559302]  ? cpuacct_charge+0x127/0x1b0
[  546.559304]  ? cpuusage_read+0x10/0x10
[  546.559307]  ? update_cfs_group+0x84/0x2a0
[  546.559309]  ? account_entity_dequeue+0xdb/0x2b0
[  546.559312]  ? reweight_entity+0x660/0x660
[  546.559314]  ? dequeue_entity+0xa30/0xa30
[  546.559316]  ? select_task_rq_fair+0xb19/0x11e0
[  546.559318]  ? dequeue_entity+0x302/0xa30
[  546.559320]  ? check_preempt_wakeup+0x500/0x500
[  546.559322]  ? select_idle_sibling+0x7b0/0x7b0
[  546.559330]  ? llist_add_batch+0xa3/0xf0
[  546.559332]  ? set_nr_if_polling+0x7a/0xf0
[  546.559333]  ? task_rq_unlock+0x60/0x60
[  546.559339]  ? sched_clock+0x5/0x10
[  546.559341]  ? sched_clock+0x5/0x10
[  546.559344]  ? x2apic_send_IPI+0x63/0x70
[  546.559347]  ? try_to_wake_up+0xe7/0x890
[  546.559349]  ? pick_next_task_fair+0x4a2/0xb60
[  546.559352]  ? load_balance+0x1790/0x1790
[  546.559354]  ? select_idle_sibling+0xca/0x7b0
[  546.559358]  ? __switch_to+0x37a/0x800
[  546.559361]  ? compat_start_thread+0x60/0x60
[  546.559367]  ? _synchronize_rcu_expedited.constprop.75+0x480/0x480
[  546.559369]  ? finish_task_switch+0x116/0x3c0
[  546.559371]  ? __hrtick_start+0x140/0x140
[  546.559373]  ? sched_clock+0x5/0x10
[  546.559375]  ? put_prev_entity+0x98/0x190
[  546.559378]  ? __schedule+0x50b/0xe20
[  546.559384]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[  546.559386]  ? firmware_map_remove+0x193/0x193
[  546.559387]  ? __wake_up_common+0xb5/0x2f0
[  546.559390]  ? pick_next_task_fair+0x4a2/0xb60
[  546.559391]  ? remove_wait_queue+0x150/0x150
[  546.559393]  ? deref_stack_reg+0xa1/0xe0
[  546.559397]  ? detach_if_pending+0x132/0x240
[  546.559399]  ? __internal_add_timer+0x160/0x160
[  546.559400]  ? lock_timer_base+0x11c/0x170
[  546.559402]  ? detach_if_pending+0x240/0x240
[  546.559404]  ? finish_wait+0x1b0/0x1d0
[  546.559405]  ? __wake_up_common+0x2f0/0x2f0
[  546.559410]  ? ret_from_fork+0x35/0x40
[  546.559412]  ? try_to_del_timer_sync+0xa1/0xe0
[  546.559414]  ? del_timer+0xe0/0xe0
[  546.559415]  ? sched_clock+0x5/0x10
[  546.559417]  ? finish_task_switch+0x116/0x3c0
[  546.559421]  ? kjournald2+0x208/0x650
[  546.559423]  kjournald2+0x208/0x650
[  546.559425]  ? commit_timeout+0x20/0x20
[  546.559426]  ? __schedule+0x50b/0xe20
[  546.559429]  ? kasan_kmalloc+0xa0/0xd0
[  546.559431]  ? kmem_cache_alloc_trace+0xe2/0x1e0
[  546.559433]  ? firmware_map_remove+0x193/0x193
[  546.559435]  ? wait_woken+0x110/0x110
[  546.559438]  ? schedule+0xb0/0x250
[  546.559439]  ? __schedule+0xe20/0xe20
[  546.559441]  ? remove_wait_queue+0x150/0x150
[  546.559444]  ? memcg_kmem_put_cache+0x6c/0x130
[  546.559446]  ? __init_waitqueue_head+0xa0/0xd0
[  546.559447]  ? print_dl_stats+0x50/0x50
[  546.559450]  ? commit_timeout+0x20/0x20
[  546.559451]  kthread+0x19e/0x1c0
[  546.559453]  ? kthread_create_worker_on_cpu+0xc0/0xc0
[  546.559455]  ret_from_fork+0x35/0x40

[  546.559485] Allocated by task 1343:
[  546.559529]  kasan_kmalloc+0xa0/0xd0
[  546.559531]  kmem_cache_alloc+0xb6/0x1c0
[  546.559536]  getname_flags+0x6c/0x2a0
[  546.559538]  do_sys_open+0x1cc/0x380
[  546.559543]  do_syscall_64+0x17a/0x330
[  546.559545]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2

[  546.559571] Freed by task 1343:
[  546.559613]  kasan_slab_free+0x71/0xc0
[  546.559615]  kmem_cache_free+0x75/0x1e0
[  546.559616]  do_sys_open+0x1f0/0x380
[  546.559618]  do_syscall_64+0x17a/0x330
[  546.559619]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2

[  546.559647] The buggy address belongs to the object at ffff8800b0518000
                which belongs to the cache names_cache of size 4096
[  546.559766] The buggy address is located 2520 bytes inside of
                4096-byte region [ffff8800b0518000, ffff8800b0519000)
[  546.559878] The buggy address belongs to the page:
[  546.559931] page:ffffea0002c14600 count:1 mapcount:0
mapping:0000000000000000 index:0x0 compound_mapcount: 0
[  546.560034] flags: 0xfffffc0008100(slab|head)
[  546.560083] raw: 000fffffc0008100 0000000000000000 0000000000000000
0000000100070007
[  546.560156] raw: 0000000000000000 0000000100000001 ffff88010cd87d40
0000000000000000
[  546.560227] page dumped because: kasan: bad access detected

[  546.560306] Memory state around the buggy address:
[  546.560356]  ffff8800b0518880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  546.560424]  ffff8800b0518900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  546.560492] >ffff8800b0518980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  546.560560]                                                     ^
[  546.562006]  ffff8800b0518a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  546.563410]  ffff8800b0518a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
fb
[  546.564800]
==================================================================
[  546.566189] Disabling lock debugging due to kernel taint
[  546.566281] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008
[  546.567687] IP: jbd2_journal_put_journal_head+0x69/0x1fa
[  546.569091] PGD 0 P4D 0
[  546.570880] Oops: 0000 [#1] SMP KASAN PTI
[  546.572605] Modules linked in: uvcvideo btusb btrtl btbcm snd_ens1371
videobuf2_vmalloc videobuf2_memops btintel videobuf2_v4l2 vmw_balloon
snd_ac97_codec input_leds videobuf2_core ac97_bus bluetooth coretemp videodev
snd_pcm intel_rapl_perf joydev snd_timer serio_raw snd_rawmidi media snd
ecdh_generic soundcore gameport shpchp i2c_piix4 mac_hid
vmw_vsock_vmci_transport vsock vmw_vmci ib_iser rdma_cm iw_cm ib_cm ib_core
iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4
btrfs zstd_decompress zstd_compress xxhash raid10 raid456 async_raid6_recov
async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0
multipath linear vmwgfx drm_kms_helper crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel syscopyarea sysfillrect pcbc sysimgblt fb_sys_fops ttm
aesni_intel
[  546.586085]  aes_x86_64 crypto_simd cryptd drm psmouse ahci glue_helper
libahci mptspi e1000 scsi_transport_spi mptscsih mptbase pata_acpi hid_generic
usbhid hid
[  546.589718] CPU: 3 PID: 1489 Comm: jbd2/loop0-8 Tainted: G    B           
4.15.15 #1
[  546.591257] Hardware name: VMware, Inc. VMware Virtual Platform/440BX
Desktop Reference Platform, BIOS 6.00 07/02/2015
[  546.594780] RIP: 0010:jbd2_journal_put_journal_head+0x69/0x1fa
[  546.596465] RSP: 0018:ffff8800b942ec40 EFLAGS: 00010286
[  546.598167] RAX: 0000000000000000 RBX: ffff8800b05189d8 RCX:
ffffffff8c058959
[  546.599763] RDX: 0000000000000000 RSI: 0000000000000004 RDI:
0000000000000008
[  546.601937] RBP: 0000000000000000 R08: ffffed0027edde58 R09:
0000000000000000
[  546.604594] R10: fbfbfbfbfbfbfbfb R11: ffffed0027edde57 R12:
ffff8800b0518a18
[  546.606763] R13: ffff88010a3aba48 R14: ffff88010a3aba50 R15:
dffffc0000000000
[  546.608845] FS:  0000000000000000(0000) GS:ffff88010d2c0000(0000)
knlGS:0000000000000000
[  546.610821] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  546.612636] CR2: 0000000000000008 CR3: 00000000aca0e006 CR4:
00000000001606e0
[  546.614380] Call Trace:
[  546.615959]  __jbd2_journal_refile_buffer+0x1db/0x1f0
[  546.617608]  ? jbd2_journal_file_buffer+0xa0/0xa0
[  546.619231]  ? kasan_end_report+0x33/0x50
[  546.620827]  ? kasan_report+0x169/0x360
[  546.622404]  jbd2_journal_commit_transaction+0x2e41/0x3bd0
[  546.623928]  ? update_load_avg+0xb81/0x1130
[  546.625570]  ? journal_submit_commit_record+0x4a0/0x4a0
[  546.627125]  ? update_load_avg+0xb81/0x1130
[  546.628596]  ? cpuusage_read+0x10/0x10
[  546.630076]  ? update_curr+0x300/0x430
[  546.631554]  ? switched_from_fair+0x10/0x10
[  546.632979]  ? update_cfs_group+0x84/0x2a0
[  546.634454]  ? account_entity_dequeue+0xdb/0x2b0
[  546.635814]  ? reweight_entity+0x660/0x660
[  546.637157]  ? dequeue_entity+0x302/0xa30
[  546.638510]  ? check_preempt_wakeup+0x4c0/0x500
[  546.639761]  ? task_prio+0x20/0x20
[  546.640982]  ? select_idle_sibling+0xca/0x7b0
[  546.642208]  ? cpuacct_charge+0x127/0x1b0
[  546.643346]  ? cpuusage_read+0x10/0x10
[  546.644445]  ? update_cfs_group+0x84/0x2a0
[  546.645552]  ? account_entity_dequeue+0xdb/0x2b0
[  546.646589]  ? reweight_entity+0x660/0x660
[  546.647597]  ? dequeue_entity+0xa30/0xa30
[  546.648675]  ? select_task_rq_fair+0xb19/0x11e0
[  546.649715]  ? dequeue_entity+0x302/0xa30
[  546.650637]  ? check_preempt_wakeup+0x500/0x500
[  546.651592]  ? select_idle_sibling+0x7b0/0x7b0
[  546.652538]  ? llist_add_batch+0xa3/0xf0
[  546.653758]  ? set_nr_if_polling+0x7a/0xf0
[  546.654716]  ? task_rq_unlock+0x60/0x60
[  546.655604]  ? sched_clock+0x5/0x10
[  546.656475]  ? sched_clock+0x5/0x10
[  546.657306]  ? x2apic_send_IPI+0x63/0x70
[  546.658178]  ? try_to_wake_up+0xe7/0x890
[  546.658973]  ? pick_next_task_fair+0x4a2/0xb60
[  546.659788]  ? load_balance+0x1790/0x1790
[  546.660599]  ? select_idle_sibling+0xca/0x7b0
[  546.661410]  ? __switch_to+0x37a/0x800
[  546.662198]  ? compat_start_thread+0x60/0x60
[  546.662973]  ? _synchronize_rcu_expedited.constprop.75+0x480/0x480
[  546.663818]  ? finish_task_switch+0x116/0x3c0
[  546.664599]  ? __hrtick_start+0x140/0x140
[  546.665438]  ? sched_clock+0x5/0x10
[  546.666248]  ? put_prev_entity+0x98/0x190
[  546.667011]  ? __schedule+0x50b/0xe20
[  546.667819]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[  546.668602]  ? firmware_map_remove+0x193/0x193
[  546.669413]  ? __wake_up_common+0xb5/0x2f0
[  546.670223]  ? pick_next_task_fair+0x4a2/0xb60
[  546.671005]  ? remove_wait_queue+0x150/0x150
[  546.671788]  ? deref_stack_reg+0xa1/0xe0
[  546.672568]  ? detach_if_pending+0x132/0x240
[  546.673392]  ? __internal_add_timer+0x160/0x160
[  546.674194]  ? lock_timer_base+0x11c/0x170
[  546.674973]  ? detach_if_pending+0x240/0x240
[  546.675755]  ? finish_wait+0x1b0/0x1d0
[  546.676533]  ? __wake_up_common+0x2f0/0x2f0
[  546.677313]  ? ret_from_fork+0x35/0x40
[  546.678231]  ? try_to_del_timer_sync+0xa1/0xe0
[  546.679083]  ? del_timer+0xe0/0xe0
[  546.679855]  ? sched_clock+0x5/0x10
[  546.680642]  ? finish_task_switch+0x116/0x3c0
[  546.681495]  ? kjournald2+0x208/0x650
[  546.682303]  kjournald2+0x208/0x650
[  546.683083]  ? commit_timeout+0x20/0x20
[  546.683928]  ? __schedule+0x50b/0xe20
[  546.684778]  ? kasan_kmalloc+0xa0/0xd0
[  546.685654]  ? kmem_cache_alloc_trace+0xe2/0x1e0
[  546.686698]  ? firmware_map_remove+0x193/0x193
[  546.687592]  ? wait_woken+0x110/0x110
[  546.688380]  ? schedule+0xb0/0x250
[  546.689180]  ? __schedule+0xe20/0xe20
[  546.690022]  ? remove_wait_queue+0x150/0x150
[  546.690826]  ? memcg_kmem_put_cache+0x6c/0x130
[  546.691685]  ? __init_waitqueue_head+0xa0/0xd0
[  546.692489]  ? print_dl_stats+0x50/0x50
[  546.693278]  ? commit_timeout+0x20/0x20
[  546.694109]  kthread+0x19e/0x1c0
[  546.694907]  ? kthread_create_worker_on_cpu+0xc0/0xc0
[  546.695693]  ret_from_fork+0x35/0x40
[  546.696487] Code: 45 08 74 0e f0 80 63 03 fe 5b 5d 41 5c 41 5d 41 5e c3 4c
8d 63 40 4c 89 e7 e8 44 c1 dc ff 48 8b 6b 40 48 8d 7d 08 e8 37 c0 dc ff <8b> 55
08 85 d2 0f 88 08 01 00 00 48 8d 7d 28 e8 23 c1 dc ff 48
[  546.699248] RIP: jbd2_journal_put_journal_head+0x69/0x1fa RSP:
ffff8800b942ec40
[  546.700163] CR2: 0000000000000008
[  546.701131] ---[ end trace a8193c5d3f5fb08a ]---

Reported by Wen Xu from SSLab, Gatech.

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