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kubelet: set terminationMessagePath perms to 0660 #108076

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kubelet: set terminationMessagePath perms to 0660 #108076

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@skrobul skrobul commented Feb 11, 2022 •
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What type of PR is this?

/kind bug

What this PR does / why we need it:

Currently, kubelet creates a world-readable and world-writeable empty files in /var/lib/kubelet/pods/{podUID}/containers/{containerName}/{containerId}. These are meant to be written by the process in containers when container is terminated.

Originally, this file was created with 0644, then despite security concerns, it was changed to 0666 in #31839. This was completed to allow containers running as non-root to write termination messages. Later on, in 2019 this has been highlighted as a security vulnerability in Kubernetes Security Audit Report in #81116.

This PR changes termination log file mode to 0660 which is the best of both worlds - it removes world-writable file, yet still allows the container user and it's group to write the termination message.

Which issue(s) this PR fixes:

Related (fixes only part) #81116

Does this PR introduce a user-facing change?

Change world-accessible permissions to owner and group only read/write for files created by kubelet '/var/lib/kubelet/pods/{podUID}/containers/busysleep/{containerId}'. 
Termination message file (by default `/dev/termination-log`) can now be written only by the container user and it's group.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

@k8s-ci-robot k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. kind/bug Categorizes issue or PR as related to a bug. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. do-not-merge/needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. labels Feb 11, 2022
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Hi @skrobul. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@k8s-ci-robot k8s-ci-robot added needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. labels Feb 11, 2022
@k8s-ci-robot k8s-ci-robot added area/kubelet sig/node Categorizes an issue or PR as relevant to SIG Node. and removed do-not-merge/needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. labels Feb 11, 2022
@skrobul skrobul mentioned this pull request Apr 4, 2022
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/ok-to-test
/triage accepted
/priority important-longterm

@k8s-ci-robot k8s-ci-robot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. triage/accepted Indicates an issue or PR is ready to be actively worked on. priority/important-longterm Important over the long term, but may not be staffed and/or may need multiple releases to complete. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. labels Apr 7, 2022
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skrobul commented Apr 8, 2022

/retest

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/lifecycle stale

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skrobul commented Jul 7, 2022

/remove-lifecycle stale

@k8s-ci-robot k8s-ci-robot removed the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Jul 7, 2022
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/lifecycle stale

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skrobul commented Oct 5, 2022 via email •
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/lifecycle stale

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skrobul commented May 31, 2024

/remove-lifecycle rotten

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/lifecycle stale

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skrobul commented Sep 28, 2024

/remove-lifecycle rotten

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dims commented Dec 16, 2024

/test all

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dims commented Dec 16, 2024

/easycla

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dims commented Dec 16, 2024

/assign @SergeyKanzhelev

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: skrobul
Once this PR has been reviewed and has the lgtm label, please ask for approval from sergeykanzhelev. For more information see the Kubernetes Code Review Process.

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/lifecycle stale

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banjoh commented Apr 15, 2025

World-writable files caused by the issue this PR fixes were flagged by security tools in a question that came my way. Is this PR still being prioritised?

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/close

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@k8s-triage-robot: Closed this PR.

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@github-project-automation github-project-automation bot moved this from Needs Reviewer to Done in SIG Node: code and documentation PRs Jun 14, 2025
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