[security][iOS] Enable stack‑canary (‑fstack‑protector‑all) for flutter_native_splash

[iulianxpopa]

Description

Our security scan identified that the iOS binary Frameworks/flutter_native_splash.framework /flutter_native_splash in package flutter_native_splash does not include stack‑canary protection (‑fstack‑protector‑all).

According to the Flutter documentation notes, this may be a false positive because Dart code does not typically require stack canaries.

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Error from security scan

Frameworks/flutter_native_splash.framework/flutter_native_splash

This binary does not have a stack canary value added to the stack. Stack canaries are used to detect and prevent exploits from overwriting return address. Use the option -fstack-protector-all to enable stack canaries.

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Additional notes

• Flutter documentation (https://docs.flutter.dev/reference/security-false-positives#shared‑objects‑should‑use‑stack‑canary‑values) acknowledges this may be a false positive for Dart.
• We believe enabling the flag is low‑cost and improves overall security posture.
• Please let us know if enabling this flag may cause any compatibility or build issues.

Thank you for your support!