43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
---
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id: "bug-1868"
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status: "fixed"
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status_updated: "2026-09-26"
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status_note: "7864a3da: xcecd_create_job_output() unlinks then creates with O_EXCL|O_NOFOLLOW|O_CLOEXEC."
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component: "worker"
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severity: "security"
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timestamp: "2026-09-26T07:40:17Z"
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last_seen: "2026-09-26T07:40:17Z"
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occurrences: 1
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files: ["src/worker/src/uv_proc.c"]
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tags: ["security", "worker", "symlink", "tmp", "uv_proc"]
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related: ["bug-1508"]
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fix_commits: ["7864a3da"]
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legacy: true
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gitea_issue: 288
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gitea_synced_status: "fixed"
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gitea_synced_hash: "a6d6a8485b1c"
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---
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# bug-1868: uv_proc_exec (worker/src/uv_proc.c) creates each task's output file /tmp/job_<jobid>_task<N>.out…
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## Description
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uv_proc_exec (worker/src/uv_proc.c) creates each task's output file /tmp/job_<jobid>_task<N>.out as root with O_WRONLY|O_CREAT|O_TRUNC and no O_NOFOLLOW/O_EXCL: a local user who pre-plants a symlink at a predictable future job's output name makes the root worker truncate and write job output into the symlink target
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## Environment
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_Not recorded (migrated from buglog.json)._
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## Reproduction
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_Not recorded (migrated from buglog.json)._
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## Root cause
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Predictable name in world-writable /tmp opened by root following symlinks. Only mitigated by the host's fs.protected_symlinks / fs.protected_regular sysctls, not by the code. Sibling of bug-1508 (read side, fixed in 7723a4f4).
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## Fix
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_Not recorded (migrated from buglog.json)._
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## Verification
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_Not recorded (migrated from buglog.json)._
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## References
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- Related: bug-1508
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- Gitea: #288
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