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… order When using `Foundation.Process`, assigning standardError to an unread `Pipe()` can lead to a deadlock if the child process writes >64KB to stderr, causing it to block while the parent is blocked on `waitUntilExit()`. This patch replaces unread `Pipe()` instances with `FileHandle.nullDevice`, and ensures that `readDataToEndOfFile()` is called *before* `waitUntilExit()` for pipes that are actually read. Co-authored-by: NSEvent <44446865+NSEvent@users.noreply.github.com>
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📝 WalkthroughWalkthroughThe changes update subprocess stream handling. Unused standard output and standard error streams now redirect to ChangesSubprocess stream handling
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Inline comments:
In
`@XboxControllerMapper/XboxControllerMapperTests/OBSWebSocketLiveIntegrationTests.swift`:
- Around line 169-171: Update resolveBinaryPath so errors from which.run() are
caught and handled before reading outPipe; avoid discarding the launch error,
ensure the process is accounted for, and preserve the existing XCTSkip behavior
when /usr/bin/which cannot launch.
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When using `Foundation.Process`, assigning standardError to an unread `Pipe()` can lead to a deadlock if the child process writes >64KB to stderr, causing it to block while the parent is blocked on `waitUntilExit()`. This patch replaces the unread `Pipe()` instance with `FileHandle.nullDevice`. Co-authored-by: NSEvent <44446865+NSEvent@users.noreply.github.com>
When using `Foundation.Process`, assigning standardError to an unread `Pipe()` can lead to a deadlock if the child process writes >64KB to stderr, causing it to block while the parent is blocked on `waitUntilExit()`. This patch replaces the unread `Pipe()` instance with `FileHandle.nullDevice`. Co-authored-by: NSEvent <44446865+NSEvent@users.noreply.github.com>
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Closing during Jules PR triage (2026-09-26): Duplicate of #174 (tailscale stderr → /dev/null), which is being merged. The test-file part is unnecessary: |
Understood. Acknowledging that this work is now obsolete and stopping work on this task. |
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🚨 Severity: HIGH
💡 Vulnerability: Potential Denial of Service (DoS) due to pipe deadlocks when executing child processes. The application assigned
standardErrorto unreadPipe()instances and calledwaitUntilExit()before reading fromstandardOutput.🎯 Impact: If a child process writes more than the OS pipe buffer size (~64KB) to an unread pipe, it blocks indefinitely. If the parent is simultaneously blocked on
waitUntilExit(), both processes deadlock.🔧 Fix: Replaced unread
Pipe()instances withFileHandle.nullDeviceto discard unwanted output without buffering. Swapped the order ofwaitUntilExit()andreadDataToEndOfFile()to ensure pipe buffers are drained while the child process runs.✅ Verification: Code statically verified to prevent the deadlock scenario. Syntax checked successfully.
PR created automatically by Jules for task 3153048692271503458 started by @NSEvent
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