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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2021-47343

dm btree remove: assign new_root only when removal succeeds

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: dm btree remove: assign new_root only when removal succeeds remove_raw() in dm_btree_remove() may fail due to IO read error (e.g. read the content of origin block fails during shadowing), and the value of shadow_spine::root is uninitialized, but the uninitialized value is still assign to new_root in the end of dm_btree_remove(). For dm-thin, the value of pmd->details_root or pmd->root will become an uninitialized value, so if trying to read details_info tree again out-of-bound memory may occur as showed below: general protection fault, probably for non-canonical address 0x3fdcb14c8d7520 CPU: 4 PID: 515 Comm: dmsetup Not tainted 5.13.0-rc6 Hardware name: QEMU Standard PC RIP: 0010:metadata_ll_load_ie+0x14/0x30 Call Trace: sm_metadata_count_is_more_than_one+0xb9/0xe0 dm_tm_shadow_block+0x52/0x1c0 shadow_step+0x59/0xf0 remove_raw+0xb2/0x170 dm_btree_remove+0xf4/0x1c0 dm_pool_delete_thin_device+0xc3/0x140 pool_message+0x218/0x2b0 target_message+0x251/0x290 ctl_ioctl+0x1c4/0x4d0 dm_ctl_ioctl+0xe/0x20 __x64_sys_ioctl+0x7b/0xb0 do_syscall_64+0x40/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae Fixing it by only assign new_root when removal succeeds

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < 4c84b3e0728ffe10d89c633694c35a02b5c477dcaffected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < c154775619186781aaf8a99333ac07437a1768d5affected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < 73f27adaa73e3057a9ec464e33c4f54d34ea5de3affected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < 8fbae4a1bdb5b889490cdee929e68540151536e5affected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < 964d57d1962d7e68f0f578f05d9ae4a104d74851affected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < ba47e65a5de3e0e8270301a409fc63d3129fdb9eaffected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < 89bf942314b78d454db92427201421b5dec132d9affected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < ad365e9351ac2b450e7e79932ff6abf59342d91aaffected
  • 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to < b6e58b5466b2959f83034bead2e2e1395cca8aebaffected

Linux Linux

Default version status: affected

  • 3.2affected
  • 0 to < 3.2unaffected
  • 4.4.276 to ≤ 4.4.*unaffected
  • 4.9.276 to ≤ 4.9.*unaffected
  • 4.14.240 to ≤ 4.14.*unaffected
  • 4.19.198 to ≤ 4.19.*unaffected
  • 5.4.133 to ≤ 5.4.*unaffected
  • 5.10.51 to ≤ 5.10.*unaffected
  • 5.12.18 to ≤ 5.12.*unaffected
  • 5.13.3 to ≤ 5.13.*unaffected
  • 5.14 to ≤ *unaffected

References