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SUSE: CVE-2021-47343: SUSE Linux Security Advisory

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SUSE: CVE-2021-47343: SUSE Linux Security Advisory

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
05/21/2024
Created
08/16/2024
Added
08/09/2024
Modified
08/09/2024

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

Solution(s)

  • suse-upgrade-kernel-64kb
  • suse-upgrade-kernel-64kb-devel
  • suse-upgrade-kernel-azure
  • suse-upgrade-kernel-azure-base
  • suse-upgrade-kernel-azure-devel
  • suse-upgrade-kernel-default
  • suse-upgrade-kernel-default-base
  • suse-upgrade-kernel-default-devel
  • suse-upgrade-kernel-default-extra
  • suse-upgrade-kernel-default-man
  • suse-upgrade-kernel-devel
  • suse-upgrade-kernel-devel-azure
  • suse-upgrade-kernel-docs
  • suse-upgrade-kernel-macros
  • suse-upgrade-kernel-obs-build
  • suse-upgrade-kernel-preempt
  • suse-upgrade-kernel-preempt-devel
  • suse-upgrade-kernel-source
  • suse-upgrade-kernel-source-azure
  • suse-upgrade-kernel-syms
  • suse-upgrade-kernel-syms-azure
  • suse-upgrade-kernel-zfcpdump
  • suse-upgrade-reiserfs-kmp-default

References

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