CVE-2021-47145: btrfs: do not BUG_ON in link_to_fixup_dir

Published Mar 25, 2024
·
Updated

In the Linux kernel, the following vulnerability has been resolved:

btrfs: do not BUGON in linktofixupdir

While doing error injection testing I got the following panic

kernel BUG at fs/btrfs/tree-log.c:1862! invalid opcode: 0000 [#1] SMP NOPTI CPU: 1 PID: 7836 Comm: mount Not tainted 5.13.0-rc1+ #305 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014 RIP: 0010:linktofixupdir+0xd5/0xe0 RSP: 0018:ffffb5800180fa30 EFLAGS: 00010216 RAX: fffffffffffffffb RBX: 00000000fffffffb RCX: ffff8f595287faf0 RDX: ffffb5800180fa37 RSI: ffff8f5954978800 RDI: 0000000000000000 RBP: ffff8f5953af9450 R08: 0000000000000019 R09: 0000000000000001 R10: 000151f408682970 R11: 0000000120021001 R12: ffff8f5954978800 R13: ffff8f595287faf0 R14: ffff8f5953c77dd0 R15: 0000000000000065 FS: 00007fc5284c8c40(0000) GS:ffff8f59bbd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc5287f47c0 CR3: 000000011275e002 CR4: 0000000000370ee0 Call Trace: replayonebuffer+0x409/0x470 ? btreereadextentbufferpages+0xd0/0x110 walkuplogtree+0x157/0x1e0 walklogtree+0xa6/0x1d0 btrfsrecoverlogtrees+0x1da/0x360 ? replayoneextent+0x7b0/0x7b0 openctree+0x1486/0x1720 btrfsmountroot.cold+0x12/0xea ? kmalloctrackcaller+0x12f/0x240 legacygettree+0x24/0x40 vfsgettree+0x22/0xb0 vfskernmount.part.0+0x71/0xb0 btrfsmount+0x10d/0x380 ? vfsparsefsstring+0x4d/0x90 legacygettree+0x24/0x40 vfsgettree+0x22/0xb0 pathmount+0x433/0xa10 x64sysmount+0xe3/0x120 dosyscall64+0x3d/0x80 entrySYSCALL64afterhwframe+0x44/0xae

We can get -EIO or any number of legitimate errors from btrfssearchslot(), panicing here is not the appropriate response. The error path for this code handles errors properly, simply return the error.

Affected Software

127 affected componentsFixes available
Linux Linux kernel<4.4.271
Linux Linux kernel>=4.5<4.9.271
Linux Linux kernel>=4.10<4.14.235
Linux Linux kernel>=4.15<4.19.193
Linux Linux kernel>=4.20<5.4.124
Linux Linux kernel>=5.5<5.10.42
Linux Linux kernel>=5.11<5.12.9
Linux Linux kernel=5.13-rc1
Linux Linux kernel=5.13-rc2
ubuntu/linux-azure<4.15.0-1121.134~14.04.1
4.15.0-1121.134~14.04.1
ubuntu/linux*
ubuntu/linux-aws<4.4.0-1153.159
4.4.0-1153.159
ubuntu/linux-lts-xenial<4.4.0-279.313~14.04.1
4.4.0-279.313~14.04.1
ubuntu/linux<4.4.0-279.313
4.4.0-279.313
ubuntu/linux-aws<4.4.0-1191.206
4.4.0-1191.206
ubuntu/linux-aws-hwe<4.15.0-1109.116~16.04.1
4.15.0-1109.116~16.04.1
ubuntu/linux-azure<4.15.0-1121.134~16.04.1
4.15.0-1121.134~16.04.1
ubuntu/linux-gcp<4.15.0-1106.120~16.04.1
4.15.0-1106.120~16.04.1
ubuntu/linux-hwe<4.15.0-151.157~16.04.1
4.15.0-151.157~16.04.1
ubuntu/linux-kvm<4.4.0-1154.165
4.4.0-1154.165
ubuntu/linux-oracle<4.15.0-1078.86~16.04.1
4.15.0-1078.86~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1123.130
4.4.0-1123.130
ubuntu/linux-fips*
ubuntu/linux<4.15.0-151.157
4.15.0-151.157
ubuntu/linux-aws<4.15.0-1109.116
4.15.0-1109.116
ubuntu/linux-aws-5.4<5.4.0-1054.57~18.04.1
5.4.0-1054.57~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1121.134
4.15.0-1121.134
ubuntu/linux-azure-5.4<5.4.0-1055.57~18.04.1
5.4.0-1055.57~18.04.1
ubuntu/linux-gcp-4.15<4.15.0-1106.120
4.15.0-1106.120
ubuntu/linux-gcp-5.4<5.4.0-1049.53~18.04.1
5.4.0-1049.53~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-80.90~18.04.1
5.4.0-80.90~18.04.1
ubuntu/linux-kvm<4.15.0-1097.99
4.15.0-1097.99
ubuntu/linux-oracle<4.15.0-1078.86
4.15.0-1078.86
ubuntu/linux-oracle-5.4<5.4.0-1052.56~18.04.1
5.4.0-1052.56~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1041.45~18.04.1
5.4.0-1041.45~18.04.1
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2051.53
4.15.0-2051.53
ubuntu/linux-azure-fips<4.15.0-2033.37
4.15.0-2033.37
ubuntu/linux-fips<4.15.0-1066.75
4.15.0-1066.75
ubuntu/linux-gcp-fips<4.15.0-2016.18
4.15.0-2016.18
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-80.90
5.4.0-80.90
ubuntu/linux-aws<5.4.0-1054.57
5.4.0-1054.57
ubuntu/linux-azure<5.4.0-1055.57
5.4.0-1055.57
ubuntu/linux-bluefield<5.4.0-1016.19
5.4.0-1016.19
ubuntu/linux-gcp<5.4.0-1049.53
5.4.0-1049.53
ubuntu/linux-gkeop<5.4.0-1021.22
5.4.0-1021.22
ubuntu/linux-kvm<5.4.0-1044.46
5.4.0-1044.46
ubuntu/linux-oracle<5.4.0-1052.56
5.4.0-1052.56
ubuntu/linux-raspi<5.4.0-1041.45
5.4.0-1041.45
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux-aws-fips<5.4.0-1069.73+fips2
5.4.0-1069.73+fips2
ubuntu/linux-azure-fips<5.4.0-1073.76+fips1
5.4.0-1073.76+fips1
ubuntu/linux-fips<5.4.0-1031.36
5.4.0-1031.36
ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1
5.4.0-1067.71~20.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-nvidia-6.2*
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1121.134~14.04.1
  2. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1153.159
  3. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-279.313~14.04.1
  4. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-279.313
  5. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1191.206
  6. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1109.116~16.04.1
  7. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1121.134~16.04.1
  8. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1106.120~16.04.1
  9. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-151.157~16.04.1
  10. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1154.165
  11. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1078.86~16.04.1
  12. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1123.130
  13. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-151.157
  14. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1109.116
  15. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1054.57~18.04.1
  16. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1121.134
  17. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1055.57~18.04.1
  18. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1106.120
  19. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1049.53~18.04.1
  20. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-80.90~18.04.1
  21. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1097.99
  22. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1078.86
  23. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1052.56~18.04.1
  24. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1041.45~18.04.1
  25. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2051.53
  26. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2033.37
  27. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1066.75
  28. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2016.18
  29. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-80.90
  30. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1054.57
  31. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1055.57
  32. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.4.0-1016.19
  33. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1049.53
  34. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.4.0-1021.22
  35. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1044.46
  36. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1052.56
  37. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1041.45
  38. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1069.73+fips2
  39. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1073.76+fips1
  40. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1031.36
  41. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1067.71~20.04.1

Event History

Mar 25, 2024
CVE Published
via MITRE·09:07 AM
Data Sourced
via MITRE·09:07 AM
Description
Data Sourced
via OSV·09:15 AM
DescriptionSeverityAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2021-47145?

CVE-2021-47145 has a severity rating that indicates a potential for system crashes due to a kernel panic.

2

How do I fix CVE-2021-47145?

To fix CVE-2021-47145, update the Linux kernel to a version that is not affected by this vulnerability.

3

What components are affected by CVE-2021-47145?

CVE-2021-47145 affects multiple versions of the Linux kernel, specifically those between versions 4.4 and 5.13-rc2.

4

What triggers the CVE-2021-47145 vulnerability?

The CVE-2021-47145 vulnerability can be triggered during error injection testing, leading to a kernel panic.

5

Is CVE-2021-47145 present in earlier versions of the Linux kernel?

Yes, CVE-2021-47145 is present in earlier versions of the Linux kernel, specifically prior to 4.4.271.

Company

Resources

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