src: bootstrap Web [Exposed=*] APIs in the shadow realm #46809

legendecas · 2023-02-24T08:23:23Z

This is the initial work to bootstrap Web interfaces that are defined
with extended attributes [Exposed=*].

The ShadowRealm instances are garbage-collected once it is
unreachable. However, V8 can not infer the reference cycles between
the per-realm strong persistent function handles and the realm's
context handle. To allow the context to be gc-ed once it is not
reachable, the per-realm persistent handles are attached to the
context's global object and the persistent handles are set as weak.

Refs: #42528

nodejs-github-bot · 2023-02-24T08:23:28Z

Review requested:

@nodejs/startup
@nodejs/realm

mcollina

lgtm

joyeecheung · 2023-02-24T21:40:12Z

src/api/environment.cc

+  // TODO(legendecas): Per-realm prepareStackTrace callback.
+  // If we are in a Realm that is not the principal Realm (e.g. ShadowRealm),
+  // skip the prepareStackTrace callback as the context's security token is
+  // likely to be different.


Actually, why do we need different security tokens? Can we just set the non-principal realm's security token to be the same as the one of the principal realm, like what we do for vm contexts? IIUC security tokens in browsers are generally intended for cross-origin global proxies, which isn't really a thing for Node.js. For shadow realms, the cross-realm access is guarded with wrapped functions and callable boundaries. For Node.js realms, do we care about cross-realm object access?

It is true that object exchange across the ShadowRealm boundary is limited with wrapped functions. However, it is still possible for host hooks like the prepareStackTrace callback here to leak objects to the principal realm's userland Error.prepareStackTrace override.

It doesn't hurt to set the security token to be the principal realm's. But I don't see the reason to allow the access either.

I've updated the comment to point out that this branch is intended to avoid calling the principal realm's Error.prepareStackTrace override instead of the security token mismatches.

test/parallel/test-shadow-realm-globals.js

test/common/globals.js

nodejs-github-bot · 2023-02-28T07:06:52Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50087/

nodejs-github-bot · 2023-03-01T07:58:41Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50124/

nodejs-github-bot · 2023-03-01T13:35:35Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50132/

src/node_realm.cc

src/node_realm-inl.h

nodejs-github-bot · 2023-03-02T19:32:31Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50165/

mcollina · 2023-03-06T14:06:18Z

CI is has a relevant test failure:

node:assert:125
  throw new AssertionError(obj);
  ^

AssertionError [ERR_ASSERTION]: Expected values to be strictly deep-equal:
+ actual - expected

+ [
+   'BroadcastChannel'
+ ]
- []
    at Object.<anonymous> (/home/iojs/build/workspace/node-test-commit-linux/test/parallel/test-shadow-realm-globals.js:27:8)
    at Module._compile (node:internal/modules/cjs/loader:1287:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1341:10)
    at Module.load (node:internal/modules/cjs/loader:1145:32)
    at Module._load (node:internal/modules/cjs/loader:984:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:83:12)
    at node:internal/main/run_main_module:23:47 {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: [ 'BroadcastChannel' ],
  expected: [],
  operator: 'deepStrictEqual'
}

Node.js v20.0.0-pre

test/parallel/test-shadow-realm-globals.js

nodejs-github-bot · 2023-03-13T03:38:39Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50345/

nodejs-github-bot · 2023-03-13T06:05:12Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50349/

nodejs-github-bot · 2023-03-14T09:57:23Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50373/

legendecas · 2023-03-15T16:31:52Z

Landed in d0153ae...e6b4d30

PR-URL: #46809 Refs: #42528 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

This is the initial work to bootstrap Web interfaces that are defined with extended attributes `[Exposed=*]`. The ShadowRealm instances are garbage-collected once it is unreachable. However, V8 can not infer the reference cycles between the per-realm strong persistent function handles and the realm's context handle. To allow the context to be gc-ed once it is not reachable, the per-realm persistent handles are attached to the context's global object and the persistent handles are set as weak. PR-URL: #46809 Refs: #42528 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

PR-URL: #46809 Refs: #42528 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

This is the initial work to bootstrap Web interfaces that are defined with extended attributes `[Exposed=*]`. The ShadowRealm instances are garbage-collected once it is unreachable. However, V8 can not infer the reference cycles between the per-realm strong persistent function handles and the realm's context handle. To allow the context to be gc-ed once it is not reachable, the per-realm persistent handles are attached to the context's global object and the persistent handles are set as weak. PR-URL: #46809 Refs: #42528 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

RafaelGSS · 2023-04-07T13:43:50Z

This is breaking v19.x-staging. Could you please create a manual backport? See: #47441 (comment)

PR-URL: nodejs#46809 Refs: nodejs#42528 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

This is the initial work to bootstrap Web interfaces that are defined with extended attributes `[Exposed=*]`. The ShadowRealm instances are garbage-collected once it is unreachable. However, V8 can not infer the reference cycles between the per-realm strong persistent function handles and the realm's context handle. To allow the context to be gc-ed once it is not reachable, the per-realm persistent handles are attached to the context's global object and the persistent handles are set as weak. PR-URL: nodejs#46809 Refs: nodejs#42528 Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

nodejs-github-bot added lib / src Issues and PRs related to general changes in the lib or src directory. needs-ci PRs that need a full CI run. labels Feb 24, 2023

legendecas added the realm Issues and PRs related to the ShadowRealm API and node::Realm label Feb 24, 2023

legendecas force-pushed the shadowrealm/builtin branch from 9801507 to b5bf1ac Compare February 24, 2023 08:26

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anonrig mentioned this pull request Mar 31, 2023

url: use ada::url_aggregator for parsing urls #47339

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memory leak in shadow realms #47353

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2023-04-18, Version 20.0.0 (Current) #47381

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[v19.x] deps: V8: cherry-pick f09dde9fbb54 #47239

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test: move test-shadow-realm-gc.js to known_issues #47355

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src: bootstrap prepare stack trace callback in shadow realm #47107

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bootstrap: store internal loaders in C++ via a binding #47215

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[v19.x] src: bootstrap Web [Exposed=*] APIs in the shadow realm #47530

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src: bootstrap Web [Exposed=*] APIs in the shadow realm #46809

src: bootstrap Web [Exposed=*] APIs in the shadow realm #46809

legendecas commented Feb 24, 2023 •

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src: bootstrap Web [Exposed=*] APIs in the shadow realm #46809

src: bootstrap Web [Exposed=*] APIs in the shadow realm #46809

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