On 3/1/21 5:28 pm, Su Yue wrote:
while mounting the poc image user-provided, kernel panics due to the
invalid chunk item whose end is less than start.
========================================================================
[ 66.387422] loop: module loaded
[ 66.389773] loop0: detected capacity change from 262144 to 0
[ 66.427708] BTRFS: device fsid a62e00e8-e94e-4200-8217-12444de93c2e devid 1
transid 12 /dev/loop0 scanned by mount (613)
[ 66.431061] BTRFS info (device loop0): disk space caching is enabled
[ 66.431078] BTRFS info (device loop0): has skinny extents
[ 66.437101] BTRFS error: insert state: end < start 29360127 37748736
[ 66.437136] ------------[ cut here ]------------
[ 66.437140] WARNING: CPU: 16 PID: 613 at fs/btrfs/extent_io.c:557
insert_state.cold+0x1a/0x46 [btrfs]
[ 66.437193] Modules linked in: loop btrfs(O) blake2b_generic xor
zstd_compress nls_iso8859_1 nls_cp437 vfat fat raid6_pq joydev mousedev
crct10dif_pclmul psmouse crc32_pclmul crc32c_intel ghash_clmulni_intel
aesni_intel glue_helper crypto_simd cryptd pcspkr rtc_cmos evdev intel_agp
intel_gtt qemu_fw_cfg drm agpgart ip_tables x_tables xfs virtio_balloon
virtio_console virtio_net net_failover failover dm_mod sd_mod hid_generic
usbhid hid uhci_hcd serio_raw atkbd libps2 ahci libahci ehci_pci ehci_hcd
libata usbcore scsi_mod virtio_pci virtio_ring usb_common virtio i8042 serio
[ 66.437369] CPU: 16 PID: 613 Comm: mount Tainted: G O
5.11.0-rc1-custom #45
[ 66.437374] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
ArchLinux 1.14.0-1 04/01/2014
[ 66.437378] RIP: 0010:insert_state.cold+0x1a/0x46 [btrfs]
[ 66.437416] Code: 39 01 00 00 48 c7 c7 85 38 9e c0 e8 3c fd ff ff 48 8b 7f 08 48
89 d1 48 89 da 4c 89 45 d0 48 c7 c6 20 b0 9e c0 e8 49 97 ff ff <0f> 0b 4c 8b 45
d0 e9 ff 28 f7 ff 49 8b 7d 08 49 89 d9 4d 89 f8 41
[ 66.437420] RSP: 0018:ffff93e5414c3908 EFLAGS: 00010286
[ 66.437427] RAX: 0000000000000000 RBX: 0000000001bfffff RCX: 0000000000000000
[ 66.437431] RDX: 0000000000000000 RSI: ffffffffb90d4660 RDI: 00000000ffffffff
[ 66.437434] RBP: ffff93e5414c3938 R08: 0000000000000001 R09: 0000000000000001
[ 66.437438] R10: ffff93e5414c3658 R11: 0000000000000000 R12: ffff8ec782d72aa0
[ 66.437441] R13: ffff8ec78bc71628 R14: 0000000000000000 R15: 0000000002400000
[ 66.437447] FS: 00007f01386a8580(0000) GS:ffff8ec809000000(0000)
knlGS:0000000000000000
[ 66.437451] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.437455] CR2: 00007f01382fa000 CR3: 0000000109a34000 CR4: 0000000000750ee0
[ 66.437460] PKRU: 55555554
[ 66.437464] Call Trace:
[ 66.437475] set_extent_bit+0x652/0x740 [btrfs]
[ 66.437539] set_extent_bits_nowait+0x1d/0x20 [btrfs]
[ 66.437576] add_extent_mapping+0x1e0/0x2f0 [btrfs]
[ 66.437621] read_one_chunk+0x33c/0x420 [btrfs]
[ 66.437674] btrfs_read_chunk_tree+0x6a4/0x870 [btrfs]
[ 66.437708] ? kvm_sched_clock_read+0x18/0x40
[ 66.437739] open_ctree+0xb32/0x1734 [btrfs]
[ 66.437781] ? bdi_register_va+0x1b/0x20
[ 66.437788] ? super_setup_bdi_name+0x79/0xd0
[ 66.437810] btrfs_mount_root.cold+0x12/0xeb [btrfs]
[ 66.437854] ? __kmalloc_track_caller+0x217/0x3b0
[ 66.437873] legacy_get_tree+0x34/0x60
[ 66.437880] vfs_get_tree+0x2d/0xc0
[ 66.437888] vfs_kern_mount.part.0+0x78/0xc0
[ 66.437897] vfs_kern_mount+0x13/0x20
[ 66.437902] btrfs_mount+0x11f/0x3c0 [btrfs]
[ 66.437940] ? kfree+0x5ff/0x670
[ 66.437944] ? __kmalloc_track_caller+0x217/0x3b0
[ 66.437962] legacy_get_tree+0x34/0x60
[ 66.437974] vfs_get_tree+0x2d/0xc0
[ 66.437983] path_mount+0x48c/0xd30
[ 66.437998] __x64_sys_mount+0x108/0x140
[ 66.438011] do_syscall_64+0x38/0x50
[ 66.438018] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 66.438023] RIP: 0033:0x7f0138827f6e
[ 66.438029] Code: 48 8b 0d 05 0f 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 73 01 c3 48 8b 0d d2 0e 0c 00 f7 d8 64 89 01 48
[ 66.438033] RSP: 002b:00007ffecd79edf8 EFLAGS: 00000246 ORIG_RAX:
00000000000000a5
[ 66.438040] RAX: ffffffffffffffda RBX: 00007f013894c264 RCX: 00007f0138827f6e
[ 66.438044] RDX: 00005593a4a41360 RSI: 00005593a4a33690 RDI: 00005593a4a3a6c0
[ 66.438047] RBP: 00005593a4a33440 R08: 0000000000000000 R09: 0000000000000001
[ 66.438050] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 66.438054] R13: 00005593a4a3a6c0 R14: 00005593a4a41360 R15: 00005593a4a33440
[ 66.438078] irq event stamp: 18169
[ 66.438082] hardirqs last enabled at (18175): [<ffffffffb81154bf>]
console_unlock+0x4ff/0x5f0
[ 66.438088] hardirqs last disabled at (18180): [<ffffffffb8115427>]
console_unlock+0x467/0x5f0
[ 66.438092] softirqs last enabled at (16910): [<ffffffffb8a00fe2>]
asm_call_irq_on_stack+0x12/0x20
[ 66.438097] softirqs last disabled at (16905): [<ffffffffb8a00fe2>]
asm_call_irq_on_stack+0x12/0x20
[ 66.438103] ---[ end trace e114b111db64298b ]---
[ 66.438107] BTRFS error: found node 12582912 29360127 on insert of 37748736
29360127
[ 66.438127] BTRFS critical: panic in extent_io_tree_panic:679: locking
error: extent tree was modified by another thread while locked (errno=-17
Object already exists)
[ 66.441069] ------------[ cut here ]------------
[ 66.441072] kernel BUG at fs/btrfs/extent_io.c:679!
[ 66.442064] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[ 66.443018] CPU: 16 PID: 613 Comm: mount Tainted: G W O
5.11.0-rc1-custom #45
[ 66.444538] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
ArchLinux 1.14.0-1 04/01/2014
[ 66.446223] RIP: 0010:extent_io_tree_panic.isra.0+0x23/0x25 [btrfs]
[ 66.447419] Code: 9e c0 e8 d1 ff ff ff 0f 1f 44 00 00 55 89 f1 49 c7 c0 70 ae 9e
c0 ba a7 02 00 00 48 c7 c6 00 b5 9d c0 48 89 e5 e8 15 a0 ff ff <0f> 0b 42 8d 14
10 4c 89 4d a8 89 c1 81 fa 00 10 00 00 89 45 b0 44
[ 66.450878] RSP: 0018:ffff93e5414c3948 EFLAGS: 00010246
[ 66.451840] RAX: 0000000000000000 RBX: 0000000001bfffff RCX: 0000000000000000
[ 66.453141] RDX: 0000000000000000 RSI: ffffffffb90d4660 RDI: 00000000ffffffff
[ 66.454445] RBP: ffff93e5414c3948 R08: 0000000000000001 R09: 0000000000000001
[ 66.455743] R10: ffff93e5414c3658 R11: 0000000000000000 R12: ffff8ec782d728c0
[ 66.457055] R13: ffff8ec78bc71628 R14: ffff8ec782d72aa0 R15: 0000000002400000
[ 66.458356] FS: 00007f01386a8580(0000) GS:ffff8ec809000000(0000)
knlGS:0000000000000000
[ 66.459841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 66.460895] CR2: 00007f01382fa000 CR3: 0000000109a34000 CR4: 0000000000750ee0
[ 66.462196] PKRU: 55555554
[ 66.462692] Call Trace:
[ 66.463139] set_extent_bit.cold+0x30/0x98 [btrfs]
[ 66.464049] set_extent_bits_nowait+0x1d/0x20 [btrfs]
[ 66.490466] add_extent_mapping+0x1e0/0x2f0 [btrfs]
[ 66.514097] read_one_chunk+0x33c/0x420 [btrfs]
[ 66.534976] btrfs_read_chunk_tree+0x6a4/0x870 [btrfs]
[ 66.555718] ? kvm_sched_clock_read+0x18/0x40
[ 66.575758] open_ctree+0xb32/0x1734 [btrfs]
[ 66.595272] ? bdi_register_va+0x1b/0x20
[ 66.614638] ? super_setup_bdi_name+0x79/0xd0
[ 66.633809] btrfs_mount_root.cold+0x12/0xeb [btrfs]
[ 66.652938] ? __kmalloc_track_caller+0x217/0x3b0
[ 66.671925] legacy_get_tree+0x34/0x60
[ 66.690300] vfs_get_tree+0x2d/0xc0
[ 66.708221] vfs_kern_mount.part.0+0x78/0xc0
[ 66.725808] vfs_kern_mount+0x13/0x20
[ 66.742730] btrfs_mount+0x11f/0x3c0 [btrfs]
[ 66.759350] ? kfree+0x5ff/0x670
[ 66.775441] ? __kmalloc_track_caller+0x217/0x3b0
[ 66.791750] legacy_get_tree+0x34/0x60
[ 66.807494] vfs_get_tree+0x2d/0xc0
[ 66.823349] path_mount+0x48c/0xd30
[ 66.838753] __x64_sys_mount+0x108/0x140
[ 66.854412] do_syscall_64+0x38/0x50
[ 66.869673] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 66.885093] RIP: 0033:0x7f0138827f6e
[ 66.899790] Code: 48 8b 0d 05 0f 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 73 01 c3 48 8b 0d d2 0e 0c 00 f7 d8 64 89 01 48
[ 66.945613] RSP: 002b:00007ffecd79edf8 EFLAGS: 00000246 ORIG_RAX:
00000000000000a5
[ 66.977214] RAX: ffffffffffffffda RBX: 00007f013894c264 RCX: 00007f0138827f6e
[ 66.994266] RDX: 00005593a4a41360 RSI: 00005593a4a33690 RDI: 00005593a4a3a6c0
[ 67.011544] RBP: 00005593a4a33440 R08: 0000000000000000 R09: 0000000000000001
[ 67.028836] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 67.045812] R13: 00005593a4a3a6c0 R14: 00005593a4a41360 R15: 00005593a4a33440
[ 67.062965] Modules linked in: loop btrfs(O) blake2b_generic xor
zstd_compress nls_iso8859_1 nls_cp437 vfat fat raid6_pq joydev mousedev
crct10dif_pclmul psmouse crc32_pclmul crc32c_intel ghash_clmulni_intel
aesni_intel glue_helper crypto_simd cryptd pcspkr rtc_cmos evdev intel_agp
intel_gtt qemu_fw_cfg drm agpgart ip_tables x_tables xfs virtio_balloon
virtio_console virtio_net net_failover failover dm_mod sd_mod hid_generic
usbhid hid uhci_hcd serio_raw atkbd libps2 ahci libahci ehci_pci ehci_hcd
libata usbcore scsi_mod virtio_pci virtio_ring usb_common virtio i8042 serio
[ 67.216138] ---[ end trace e114b111db64298c ]---
[ 67.237089] RIP: 0010:extent_io_tree_panic.isra.0+0x23/0x25 [btrfs]
[ 67.258567] Code: 9e c0 e8 d1 ff ff ff 0f 1f 44 00 00 55 89 f1 49 c7 c0 70 ae 9e
c0 ba a7 02 00 00 48 c7 c6 00 b5 9d c0 48 89 e5 e8 15 a0 ff ff <0f> 0b 42 8d 14
10 4c 89 4d a8 89 c1 81 fa 00 10 00 00 89 45 b0 44
[ 67.325317] RSP: 0018:ffff93e5414c3948 EFLAGS: 00010246
[ 67.347946] RAX: 0000000000000000 RBX: 0000000001bfffff RCX: 0000000000000000
[ 67.371343] RDX: 0000000000000000 RSI: ffffffffb90d4660 RDI: 00000000ffffffff
[ 67.394757] RBP: ffff93e5414c3948 R08: 0000000000000001 R09: 0000000000000001
[ 67.418409] R10: ffff93e5414c3658 R11: 0000000000000000 R12: ffff8ec782d728c0
[ 67.441906] R13: ffff8ec78bc71628 R14: ffff8ec782d72aa0 R15: 0000000002400000
[ 67.465436] FS: 00007f01386a8580(0000) GS:ffff8ec809000000(0000)
knlGS:0000000000000000
[ 67.511660] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 67.535047] CR2: 00007f01382fa000 CR3: 0000000109a34000 CR4: 0000000000750ee0
[ 67.558449] PKRU: 55555554
[ 67.581146] note: mount[613] exited with preempt_count 2
========================================================================
The image has a chunk item which has a logical start 37748736 and length
18446744073701163008. The calculated end 29360127 is overflowed obviously.
-EEXIST was caught by insert_state() because of the duplicate end and
extent_io_tree_panic() was called.
Add overflow check of chunk item end in tree checker then the image will
be rejected to be mounted.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208929
Signed-off-by: Su Yue <l...@damenly.su>
---
fs/btrfs/tree-checker.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 028e733e42f3..39c65c1cbe96 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -760,6 +760,7 @@ int btrfs_check_chunk_valid(struct extent_buffer *leaf,
{
struct btrfs_fs_info *fs_info = leaf->fs_info;
u64 length;
+ u64 chunk_end;
u64 stripe_len;
u16 num_stripes;
u16 sub_stripes;
@@ -814,6 +815,12 @@ int btrfs_check_chunk_valid(struct extent_buffer *leaf,
"invalid chunk length, have %llu", length);
return -EUCLEAN;
}
+ if (unlikely(check_add_overflow(logical, length, &chunk_end))) {
+ chunk_err(leaf, chunk, logical,
+ "invalid chunk logical/length, have logical %llu length
%llu",
+ logical, length);
+ return -EUCLEAN;
+ }
if (unlikely(!is_power_of_2(stripe_len) || stripe_len !=
BTRFS_STRIPE_LEN)) {
chunk_err(leaf, chunk, logical,
"invalid chunk stripe length: %llu",
So this is a system chunk? It is not so evident from the trace above.
Thanks, Anand
