fix: start on filesystems that cannot chmod socket files - #3588
fix: start on filesystems that cannot chmod socket files#3588caner-akca wants to merge 1 commit into
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📝 WalkthroughWalkthroughPrivate Unix socket permission handling moved into shared IPC binding. The binding path applies mode Suggested reviewers: Merge Risk: 🟡 Moderate · up to On filesystems requiring the fallback, another local user may connect before the socket is restricted. This security-sensitive race should be resolved before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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✅ Action performedReview finished.
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Greptile SummaryThe PR centralizes private Unix-socket creation and changes API, client, handoff, and remote-bridge listeners to request mode
Confidence Score: 5/5The PR appears safe to merge, with no actionable correctness or security defect established in the changed socket-binding paths. The shared binder preserves owner-only socket creation where supported, retains the prior bind-then-restrict behavior as a targeted fallback, and removes a fallback socket safely if restriction fails.
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| Filename | Overview |
|---|---|
| src/ipc.rs | Centralizes private socket binding, unsupported-filesystem fallback, identity-safe cleanup, and focused Unix tests. |
| src/api/server.rs | Routes the JSON API listener through the shared private binder and removes duplicated permission handling. |
| src/server/headless.rs | Routes the main client-protocol listener through the shared private binder. |
| src/server/headless/lifecycle.rs | Uses the shared private binder while restoring public client sockets during lifecycle transitions. |
| src/server/handoff.rs | Replaces bind-then-chmod with the standard Unix-listener adapter while preserving nonblocking handoff behavior. |
| src/remote/attach.rs | Removes redundant post-bind permission changes from the SSH bridge listener. |
| src/server/socket_paths.rs | Removes the duplicated socket mode constant and permission wrapper. |
| src/server/headless/tests/mod.rs | Imports the unrestricted listener helper only for tests that require the previous binding primitive. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Production listener caller] --> B[bind_private listener]
B --> C[Create socket descriptor]
C --> D[Apply mode 0600 before bind]
D -->|Supported| E[Bind private socket pathname]
D -->|Unsupported| F[Bind without creation mode]
F --> G[Restrict pathname to 0600]
G -->|Success| H[Return listener]
G -->|Failure| I[Drop listener]
I --> J[Remove pathname if identity still matches]
E --> H
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Inline comments:
In `@src/ipc.rs`:
- Line 230: Update the fallback path around bind so an owner-only parent
directory is created and enforced before calling bind(path, None); do not
publish the socket until restrictive directory permissions are established,
while preserving descriptor-mode behavior.
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📒 Files selected for processing (8)
src/api/server.rssrc/ipc.rssrc/remote/attach.rssrc/server/handoff.rssrc/server/headless.rssrc/server/headless/lifecycle.rssrc/server/headless/tests/mod.rssrc/server/socket_paths.rs
💤 Files with no reviewable changes (1)
- src/server/socket_paths.rs
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Apply the owner-only mode to the socket descriptor before bind(2) so the socket pathname is never chmod'ed. Filesystems that reject fchmod on an unbound socket report Unsupported and keep the previous bind-then-restrict behavior, which is the path macOS always takes. refs herdrdev#3212
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A few things I'd shrink or move on request — none of them block review:
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2 participants
Summary
bind(2), so the pathname is neverchmodedipc::bind_private_local_listener, completing its Unix branchfchmodon a socket is unsupported, which is always the case on macOSrestrict_socket_permissionsinto one constant and one implementationherdr serverexitedOs { code: 22, kind: InvalidInput }when the config directory sat on a filesystem that rejectschmodon socket inodes. This is a crash fix, not a security fix: virtiofs discards the requested socket mode and enforces no Unix permissions between guest users, so nothing in-process can make the socket private there. Where permissions are enforced the socket is0600as before.Supersedes #3377, which I closed; reasoning is in the closing comment there.
Validation
just checkcontainer1.3.1, macOS 26.2, realvirtiofs (rw,relatime), cross-compiledaarch64-unknown-linux-gnu:masterexits 1, this branch starts and servessession list,pane list, and named sessionsstraceon virtiofs and overlayfs:fchmod(4, 0600) = 0thenbind(...), and zerochmodcalls on the pathnameUnsupportedfallback, non-Unsupportederrors staying fatal, and socket cleanup when the fallback restrict failsrefs #3212