fetch: free an evicted custom TLS context between loop ticks, not inside its own socket callback - #42693
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…wn socket callback A request whose TLS context left the 60-entry cache holds the last ref to it. The request gives that ref up in its result callback, which runs inside callbacks of the context's own sockets, so the context and the socket group embedded in it were freed while uSockets was still in the dispatch. When the server closed the connection, us_internal_ssl_detach read s->group->loop from the freed context right after the close callback returned. The last deref of an HTTPContext now queues it on the HTTP thread, which frees it between drain_events() and the next tick(), whoever held the last ref.
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Status: ready for a maintainer. Buildkite build #115456 passed. No review thread is open. Reproduced on main (3f7f046) with a debug ASAN build:
Result: The two new tests in Self-reviewed before the push. The review asked to move the deferral from the two holder sites into the |
WalkthroughThe change defers final custom SSL context destruction between HTTP event-loop ticks. It clarifies dispatch safety comments and expands ASAN coverage to HTTP/2 and HTTP/1.1. ChangesTLS cleanup safety
Suggested reviewers: Priority: ➖ Normal Merge Risk: 🔵 Low · up to The implementation has no identified runtime risk, but the new parameterized test should use the repository-required suite structure before merge. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@test/js/web/fetch/fetch-http2-client.test.ts`:
- Around line 2385-2391: Update the parameterized protocol test around the test
case titled “a connection that the server closes does not free the context
inside the close callback” to use describe.each(["http2", "http1.1"]) for
protocol-specific grouping, with the individual assertion remaining as a regular
test inside the generated describe block.
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packages/bun-usockets/src/context.cpackages/bun-usockets/src/loop.csrc/http/HTTPContext.rssrc/http/HTTPThread.rstest/js/web/fetch/fetch-http2-client.test.ts
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I reviewed this PR and didn't find any bugs. Because it changes destructor timing for refcounted TLS contexts on the HTTP thread — a memory-safety-critical lifecycle — a human look would still be worthwhile.
What was reviewed:
- Verified
free_dead_ssl_contextsuseswhile let popso a context whoseDrop(viaclose_all→ close handler) queues another dead context is handled in the same drain, and theVecborrow ends beforeheap::destroyruns. - Checked placement in
process_events: contexts queued duringtick()are freed after the nextdrain_events(), still outside any socket callback; nothing can re-acquire a ref to a queued (refcount-0, cache-evicted) context in between. - Confirmed the
debug_assert!(SSL)+ cast is guarded by the "global contexts never deref'd" invariant, and the pattern matchesWindowsNamedPipeContext's existing#[ref_count(destroy = …)]hook. - Tests:
busySocketis set before the firstreader.read()resolves;idleClosedawaits the observable close (no sleep);https/nodetlsimports already present; the h2/h1.1 matrix and server-side-destroy path cover the sibling variants REVIEW.md asks for.
Extended reasoning...
Overview
This PR fixes a heap-use-after-free where a custom TLS HTTPContext<true> could be destroyed from inside one of its own socket callbacks, after which uSockets reads s->group (embedded in the freed context) on callback return. The fix adds #[ref_count(destroy = Self::destroy_between_ticks)] so the last deref pushes the context onto HttpThread::dead_ssl_contexts instead of freeing in place, and process_events drains that queue between drain_events() and tick(). Two C comments in packages/bun-usockets are updated (no code change) to state the "never deinit from inside a dispatch" contract. Tests extend the existing ASAN-gated block in fetch-http2-client.test.ts to cover both h2 and HTTP/1.1 with a server-side socket destroy, and add a non-ASAN test that observes the deferred free actually happening via the idle keep-alive socket closing.
Security risks
The change touches TLS context lifecycle in the HTTP client. It does not alter TLS validation, certificate handling, or connection establishment — only when the destructor of an already-doomed context runs. The queue holds NonNull pointers to refcount-zero, cache-evicted contexts, so no path can resurrect or reuse them; heap::destroy runs the same Drop as before, just at a safe point. I see no injection, auth, or data-exposure surface here. The residual risk is the classic one for deferred-free schemes: if a raw pointer to the context or its embedded group were held anywhere between the last deref and free_dead_ssl_contexts, it would now dangle longer rather than shorter — but the PR narrows the UAF window rather than widening it, and the invariant "everything runs inside drain_events or tick" is stated and matches the loop body.
Level of scrutiny
High. This is refcount + destructor-ordering logic on a hot, security-adjacent path (per-request TLS contexts), and REVIEW.md explicitly calls out "reference counts provably balanced on every terminal path" and "the released ref may be the last one mid-callback" as the most-blocked category. The change itself is small (~40 lines of Rust) and mirrors an existing pattern (WindowsNamedPipeContext uses the same ref_count(destroy = …) hook), which reduces novelty risk. Still, the subtlety of re-entrant Drop (a context's close_all firing close handlers that may push more dead contexts mid-drain) and the SSL const-generic cast justify a maintainer confirming the lifecycle reasoning.
Other factors
Test coverage is strong: the ASAN-only cases reproduce the exact freed-read on the unfixed build for both h2 and HTTP/1.1 (satisfying REVIEW.md's "UAF fixes need an ASAN repro" and "fix the whole bug class — SSL/non-SSL, h1/h2 variants"), and the new non-ASAN test guards against the deferral turning into a leak by awaiting an observable event (idle socket close) rather than sleeping. The C changes are comment-only. The while let pop drain correctly handles pushes during iteration without holding a Vec borrow across heap::destroy. The PR description is thorough, cites the exact ASAN frames, explains why the fix belongs at the HTTPContext layer rather than in uSockets, and lists the passing test suites. Given all that, this is close to approvable, but memory-safety lifecycle changes in TLS contexts warrant a human sign-off.
…ide its own socket callback (oven-sh#42693) ### Problem - A `fetch()` with its own TLS context (for example `tls: { serverName }`) holds the last ref to that `HTTPContext` once the 60-entry context cache evicts it. When the server closes the connection, a debug ASAN build reports `AddressSanitizer: heap-use-after-free` in `us_internal_ssl_detach` (`packages/bun-usockets/src/crypto/openssl.c:1827`). A release build shows nothing. - The request drops its ref in the result callback (`src/http/AsyncHTTP.rs:745`), inside the close callback of the context's own socket. That frees the context and the socket group embedded in it. `us_internal_ssl_on_close` then reads `s->group->loop` (`openssl.c:2303`). - Found by fuzzing, no user report. It needs over 60 `tls` configs in one process, or a request older than the 30-minute cache TTL. ### Fix - The last deref of an `HTTPContext` no longer frees it in place. `#[ref_count(destroy = Self::destroy_between_ticks)]` queues it on the HTTP thread, and `process_events` frees it between `drain_events()` and the next `tick()`. - Correct because all work of the HTTP thread runs inside those two calls. No socket callback is on the stack between them, whoever dropped the last ref. - Verified: `test/js/web/fetch/fetch-http2-client.test.ts`. Two new ASAN-only tests (h2 and HTTP/1.1) fail with `src/` at main. A third checks that the context is still freed. ### Background - An `HTTPContext` embeds one uSockets socket group, and each socket points into it (`s->group`). - Custom TLS contexts are refcounted (oven-sh#29334). The cache holds one ref and each request holds one. Eviction drops only the cache ref. - `HttpThread::process_events` is the HTTP thread's loop. `drain_events()` starts and aborts requests. `tick()` runs the socket callbacks. - `WindowsNamedPipeContext` defers its free with the same hook. <details><summary>Notes</summary> ASAN report on main (3f7f046), HTTP/1.1 run, trimmed: ``` ERROR: AddressSanitizer: heap-use-after-free READ of size 8, 72 bytes inside of 208-byte region, thread T4 (HTTP Client) #0 us_internal_ssl_detach packages/bun-usockets/src/crypto/openssl.c:1827 oven-sh#1 us_internal_ssl_on_close packages/bun-usockets/src/crypto/openssl.c:2303 oven-sh#2 us_internal_socket_close_raw packages/bun-usockets/src/socket.c:328 oven-sh#3 us_internal_ssl_on_end packages/bun-usockets/src/crypto/openssl.c:2393 freed by thread T4 (HTTP Client): oven-sh#12 HTTPContext<true>::destroy oven-sh#15 RefPtr<HTTPContext<true>>::drop oven-sh#19 AsyncHTTP::on_async_http_callback_raw src/http/AsyncHTTP.rs:745 oven-sh#21 HTTPClient::dispatch_result_and_reset src/http/lib.rs:1618 oven-sh#22 HTTPClient::fail src/http/lib.rs:3970 oven-sh#23 HTTPClient::on_close::<true> src/http/lib.rs:2163 oven-sh#24 Handler<true>::on_close src/http/HTTPContext.rs:1341 oven-sh#28 us_internal_ssl_on_close packages/bun-usockets/src/crypto/openssl.c:2301 ``` The h2 run frees through `fail_from_h2`, called by `ClientSession::fail_streams`, called by `ClientSession::on_close`. oven-sh#42647 fixed a different defect with the same trigger (a stream freed twice in the h2 deliver loop). With this change that trigger is gone too: the context's `Drop`, which closes the session's socket, no longer runs inside the deliver loop. One more path fails on main with the same report: a keep-alive socket that the server closes before it answers. The request dials again from inside the close callback, and the new context displaces the ref on the old one. A redirect, an idle timeout, a DNS failure, an abort and a normal end of the response on an evicted context show no report on main. Why the fix is in `HTTPContext` and not in uSockets. `HTTPContext` is the only socket group owner in bun that freed its group from inside a socket callback. `Listener` frees its group from a finalizer, and the other TLS users share per-VM groups. The safety contract on `SocketGroup::destroy` (`src/uws_sys/SocketGroup.rs`) already says that it must not run while the loop walks the group. A C-side change that passes `loop` into `us_internal_ssl_detach` also stops this report. It leaves the context free to die under Rust frames that still hold its raw pointer, and the next read of `s->group` after a dispatch brings the report back (that read came with oven-sh#31584, and `ssl_release_batch` after it). Two comments in uSockets said the opposite of the Rust contract: `us_socket_group_deinit` called a deinit from `on_close` fine. They now say what `SocketGroup::destroy` says. No C code changes. An earlier draft of this branch routed each holder (`AsyncHTTP::on_async_http_callback_raw`, `HttpThread::connect`) through a queue of refs. The hook replaces that: no holder can get it wrong, and only dead contexts are queued, not one ref per request. No wakeup is needed. A context that dies during `tick()` is freed as soon as that tick returns. One that dies during `drain_events()` (a request that fails at start, a cache eviction) is freed right after it. At process exit the queue is not drained, like the cache. Related history: oven-sh#31660 (closed) is a crash of the same class in the Zig implementation, where the last ref went away inside `onLongTimeout`. Tests: - The ASAN-only block from oven-sh#42647 now takes a protocol. The child holds a response open on a context made by `serverName`, runs 61 more TLS configs to evict it, and writes `evicted` to stderr. The two new tests then destroy the server side of the held TLS socket, over h2 and over HTTP/1.1. With `src/` at main both fail with the report above. - `an evicted custom TLS context is freed when its last request ends` runs on each build. It does not fail on main. It exists because the deferral adds a way to leak: if the queue is never drained, a dead context lives forever. The test keeps one request busy on a context, leaves a second connection idle in that context's keep-alive pool, evicts the context, ends the busy request, and waits for the server to see the idle connection close. With the `heap::destroy` call removed the test times out. Suites run on the debug ASAN build: `fetch-http2-client.test.ts` (70 pass), `fetch-http2-leak.test.ts` (7), `fetch-http2-adversarial.test.ts` (20), `fetch.tls.test.ts` (34), `fetch-redirect.test.ts` (30), `fetch-tls-abortsignal-timeout.test.ts` (6), `fetch-proxy-tls-intern-race.test.ts` (1), `tls-keepalive.test.ts` (4 pass, 2 skip), `fetch-abort-ssl-context-eviction.test.ts` (1), `regression/issue/27358.test.ts` (2). On a release build of this branch: `tls-keepalive.test.ts` 6 pass (same config: 20000 requests, 0 MB growth. 200 distinct configs: 1 MB growth), `fetch-http2-client.test.ts` 66 pass and 4 skip, `fetch-abort-ssl-context-eviction.test.ts` 1 pass. </details> <!-- robobun:evidence:begin --> --- **[human-review]** gate passed · iteration 0 · 5 files touched <details><summary>fails on main (without fix)</summary> ```console ASAN without fix: 2 FAILED $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" "test/js/web/fetch/fetch-http2-client.test.ts" bun test v1.4.3 (b993710) test/js/web/fetch/fetch-http2-client.test.ts: (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > GET: status, headers and body round-trip [1172.89ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > response body larger than one DATA frame [989.87ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > concurrent requests multiplex on one h2 session [1222.39ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > POST with ReadableStream body streams as raw DATA frames [467.33ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > POST: request body is delivered as DATA frames [1562.88ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > gzip content-encoding is decompressed [1655.77ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > POST with ReadableStream body larger than initial send window [960.24m ... (truncated) release without fix: 4 skipped bun test v1.4.3-canary.1 (722de17) test/js/web/fetch/fetch-http2-client.test.ts: (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > GET: status, headers and body round-trip [73.34ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > response body larger than one DATA frame [65.19ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > gzip content-encoding is decompressed [89.92ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > POST: request body is delivered as DATA frames [102.83ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > connection-specific request headers are stripped before HPACK [74.16ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > multiple Set-Cookie response headers survive HPACK decode [74.43ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > concurrent requests multiplex on one h2 session [101.86ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > abort sends RST_STREAM; siblings on the session survive [107.88ms] (pass) fetch() over HTTP/2 (BUN_FE ... (truncated) ``` </details> <details><summary>passes on PR (with fix)</summary> ```console ASAN with fix: all passed $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" "test/js/web/fetch/fetch-http2-client.test.ts" bun test v1.4.3 (b993710) test/js/web/fetch/fetch-http2-client.test.ts: (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > GET: status, headers and body round-trip [1119.35ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > response body larger than one DATA frame [988.06ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > concurrent requests multiplex on one h2 session [1222.20ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > POST with ReadableStream body streams as raw DATA frames [531.27ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > POST: request body is delivered as DATA frames [1925.52ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > gzip content-encoding is decompressed [2051.61ms] (pass) fetch() over HTTP/2 (BUN_FEATURE_FLAG_EXPERIMENTAL_HTTP2_CLIENT) > POST with ReadableStream body larger than initial send window [837.85m ... (truncated) release with fix: 4 skipped $ bun scripts/build.ts --profile=release [configured] bun-profile → bun (stripped) in 846ms (unchanged) ninja: Entering directory `/workspace/bun/build/release' [1/128] gen generated_host_exports.rs generated_host_exports.rs: 122 exports (host=5, lazy=10, generic=107, rust=0); 243 extern-C blocks audited [2/128] gen cpp.rs (cppbind) [3/128] gen JS modules (bundle-modules) Preprocess modules (9358ms) Bundle modules (81ms) Postprocesss modules (248ms) Bundle Functions (727ms) Generate Code (35ms) [10.46s] Bundled "src/js" for production 2600 kb 197 internal modules 13 native modules 50 internal functions across 16 files [3/127] cargo bun_runtime → libbun_runtime.a �[1m�[92m Compiling�[0m bun_threading v0.0.0 (/workspace/bun/src/threading) �[1m�[92m Compiling�[0m bun_react_compiler v0.0.0 (/workspace/bun/src/react_compiler) �[1m�[92m Compiling�[0m bun_io v0.0.0 (/workspace/bun/src/io) �[1m�[92m Compiling�[0m bun_watcher v0.0.0 (/workspace/bun/src/watcher) �[1m�[92m Compiling�[0m bun_crash_handler v0.0.0 (/workspace/bun/src/crash_handler) �[1m�[92m Compiling�[0m bun_event_loop v0.0.0 (/workspace/bun/src/event_loop) �[1m�[92m Compiling�[0m bun_ ... (truncated) ``` </details> <details><summary>diff hotspot</summary> ``` packages/bun-usockets/src/context.c | 10 ++- packages/bun-usockets/src/loop.c | 10 +-- src/http/HTTPContext.rs | 17 +++- src/http/HTTPThread.rs | 18 ++++ test/js/web/fetch/fetch-http2-client.test.ts | 125 ++++++++++++++++++++++----- 5 files changed, 151 insertions(+), 29 deletions(-) ``` </details> **gate history** · 1 passed · 0 rejected · iteration 0 <details><summary>evidence per changed file</summary> ``` file reads edits tests packages/bun-usockets/src/context.c 1 1 28 packages/bun-usockets/src/loop.c 1 1 28 src/http/HTTPContext.rs 4 5 28 src/http/HTTPThread.rs 5 15 28 test/js/web/fetch/fetch-http2-client.test.ts 4 11 28 ``` </details> <!-- robobun:evidence:end -->
2 participants
Problem
fetch()with its own TLS context (for exampletls: { serverName }) holds the last ref to thatHTTPContextonce the 60-entry context cache evicts it. When the server closes the connection, a debug ASAN build reportsAddressSanitizer: heap-use-after-freeinus_internal_ssl_detach(packages/bun-usockets/src/crypto/openssl.c:1827). A release build shows nothing.src/http/AsyncHTTP.rs:745), inside the close callback of the context's own socket. That frees the context and the socket group embedded in it.us_internal_ssl_on_closethen readss->group->loop(openssl.c:2303).tlsconfigs in one process, or a request older than the 30-minute cache TTL.Fix
HTTPContextno longer frees it in place.#[ref_count(destroy = Self::destroy_between_ticks)]queues it on the HTTP thread, andprocess_eventsfrees it betweendrain_events()and the nexttick().test/js/web/fetch/fetch-http2-client.test.ts. Two new ASAN-only tests (h2 and HTTP/1.1) fail withsrc/at main. A third checks that the context is still freed.Background
HTTPContextembeds one uSockets socket group, and each socket points into it (s->group).HttpThread::process_eventsis the HTTP thread's loop.drain_events()starts and aborts requests.tick()runs the socket callbacks.WindowsNamedPipeContextdefers its free with the same hook.Notes
ASAN report on main (3f7f046), HTTP/1.1 run, trimmed:
The h2 run frees through
fail_from_h2, called byClientSession::fail_streams, called byClientSession::on_close. #42647 fixed a different defect with the same trigger (a stream freed twice in the h2 deliver loop). With this change that trigger is gone too: the context'sDrop, which closes the session's socket, no longer runs inside the deliver loop.One more path fails on main with the same report: a keep-alive socket that the server closes before it answers. The request dials again from inside the close callback, and the new context displaces the ref on the old one. A redirect, an idle timeout, a DNS failure, an abort and a normal end of the response on an evicted context show no report on main.
Why the fix is in
HTTPContextand not in uSockets.HTTPContextis the only socket group owner in bun that freed its group from inside a socket callback.Listenerfrees its group from a finalizer, and the other TLS users share per-VM groups. The safety contract onSocketGroup::destroy(src/uws_sys/SocketGroup.rs) already says that it must not run while the loop walks the group. A C-side change that passesloopintous_internal_ssl_detachalso stops this report. It leaves the context free to die under Rust frames that still hold its raw pointer, and the next read ofs->groupafter a dispatch brings the report back (that read came with #31584, andssl_release_batchafter it). Two comments in uSockets said the opposite of the Rust contract:us_socket_group_deinitcalled a deinit fromon_closefine. They now say whatSocketGroup::destroysays. No C code changes.An earlier draft of this branch routed each holder (
AsyncHTTP::on_async_http_callback_raw,HttpThread::connect) through a queue of refs. The hook replaces that: no holder can get it wrong, and only dead contexts are queued, not one ref per request.No wakeup is needed. A context that dies during
tick()is freed as soon as that tick returns. One that dies duringdrain_events()(a request that fails at start, a cache eviction) is freed right after it. At process exit the queue is not drained, like the cache.Related history: #31660 (closed) is a crash of the same class in the Zig implementation, where the last ref went away inside
onLongTimeout.Tests:
serverName, runs 61 more TLS configs to evict it, and writesevictedto stderr. The two new tests then destroy the server side of the held TLS socket, over h2 and over HTTP/1.1. Withsrc/at main both fail with the report above.an evicted custom TLS context is freed when its last request endsruns on each build. It does not fail on main. It exists because the deferral adds a way to leak: if the queue is never drained, a dead context lives forever. The test keeps one request busy on a context, leaves a second connection idle in that context's keep-alive pool, evicts the context, ends the busy request, and waits for the server to see the idle connection close. With theheap::destroycall removed the test times out.Suites run on the debug ASAN build:
fetch-http2-client.test.ts(70 pass),fetch-http2-leak.test.ts(7),fetch-http2-adversarial.test.ts(20),fetch.tls.test.ts(34),fetch-redirect.test.ts(30),fetch-tls-abortsignal-timeout.test.ts(6),fetch-proxy-tls-intern-race.test.ts(1),tls-keepalive.test.ts(4 pass, 2 skip),fetch-abort-ssl-context-eviction.test.ts(1),regression/issue/27358.test.ts(2). On a release build of this branch:tls-keepalive.test.ts6 pass (same config: 20000 requests, 0 MB growth. 200 distinct configs: 1 MB growth),fetch-http2-client.test.ts66 pass and 4 skip,fetch-abort-ssl-context-eviction.test.ts1 pass.[human-review] gate passed · iteration 0 · 5 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 1 passed · 0 rejected · iteration 0
evidence per changed file