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feat: buildGStackLaunchArgs adds --gstack-suppress-prepare-stack-trace

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Pack 2 / B11 flag plumbing for the new
error-preparestacktrace-stealth.patch in gbrowser/chromium/patches/.

Always emit --gstack-suppress-prepare-stack-trace unless the caller
explicitly sets GSTACK_CDP_STEALTH=off in the environment. Off by
default in patch behavior (no-op without the C++ patch), so this is
safe on stock Playwright Chromium too.

Closes the Cloudflare canary trick where a page sets
Error.prepareStackTrace and watches for it to fire during CDP
serialization of a logged Error object.

Tests:
  All 33 stealth/browser-manager tests pass. New cases:
  - GSTACK_CDP_STEALTH=off disables suppression
  - empty env still emits the always-on flag (count=1)
  - all-populated env now emits 7 flags (was 6)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-05-19 17:23:57 -07:00
parent 13f7e351da
commit 1d03d5a2e9
2 changed files with 31 additions and 5 deletions
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browse/src/stealth.ts
+10
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@@ -323,6 +323,16 @@ export function buildGStackLaunchArgs(): string[] {
const memory = env.GSTACK_DEVICE_MEMORY;
if (memory) args.push(`--gstack-device-memory=${memory}`);
// Pack 2 / B11: suppress user-defined Error.prepareStackTrace during
// V8 stack-trace formatting. Closes the Cloudflare Bot Management
// canary trick where a page sets prepareStackTrace and watches for
// it to fire during CDP serialization. Off by default — only set
// when the C++ patch is present (gbrowser builds), gstack hosts
// running stock Playwright Chromium leave it unset.
if (env.GSTACK_CDP_STEALTH !== 'off') {
args.push('--gstack-suppress-prepare-stack-trace');
}
return args;
}