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CVE PROGRAM SOURCE RECORDUnscored

CVE-2021-46971

perf/core: Fix unconditional security_locked_down() call

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix unconditional security_locked_down() call Currently, the lockdown state is queried unconditionally, even though its result is used only if the PERF_SAMPLE_REGS_INTR bit is set in attr.sample_type. While that doesn't matter in case of the Lockdown LSM, it causes trouble with the SELinux's lockdown hook implementation. SELinux implements the locked_down hook with a check whether the current task's type has the corresponding "lockdown" class permission ("integrity" or "confidentiality") allowed in the policy. This means that calling the hook when the access control decision would be ignored generates a bogus permission check and audit record. Fix this by checking sample_type first and only calling the hook when its result would be honored.

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

  • b0c8fdc7fdb77586c3d1937050925b960743306e to < b246759284d6a2bc5b6f1009caeeb3abce2ec9ffaffected
  • b0c8fdc7fdb77586c3d1937050925b960743306e to < 4348d3b5027bc3ff6336368b6c60605d4ef8e1ceaffected
  • b0c8fdc7fdb77586c3d1937050925b960743306e to < f5809ca4c311b71bfaba6d13f4e39eab0557895eaffected
  • b0c8fdc7fdb77586c3d1937050925b960743306e to < c7b0208ee370b89d20486fae71cd9abb759819c1affected
  • b0c8fdc7fdb77586c3d1937050925b960743306e to < 08ef1af4de5fe7de9c6d69f1e22e51b66e385d9baffected

Linux Linux

Default version status: affected

  • 5.4affected
  • 0 to < 5.4unaffected
  • 5.4.117 to ≤ 5.4.*unaffected
  • 5.10.35 to ≤ 5.10.*unaffected
  • 5.11.19 to ≤ 5.11.*unaffected
  • 5.12.2 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References