fix: bound DWARF .eh_frame_hdr parsing to the section

[edznux-dd]

What does this PR do?:

Fix bound checking on untrusted section size, avoid infinite loops, and fix small fuzz-harness only memory leak.

Motivation:

Make the dwarf parser more reliable.

Additional Notes:

How to test the change?:

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.
• JIRA: [JIRA-XXXX]

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[chatgpt-codex-connector]

Stop bounding FDE addresses to .eh_frame_hdr

For normal Linux ELFs, the PT_GNU_EH_FRAME segment size passed from symbols_linux.cpp covers only .eh_frame_hdr, while the table entries resolve to FDE records in the adjacent .eh_frame section. With this check, valid FDE offsets that are outside the header are skipped, so the parser builds an empty DWARF table and loses per-PC unwind/default-frame detection for regular shared libraries and executables.

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[datadog-prod-us1-5]

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⚠️ Warnings

🚦 8 Pipeline jobs failed

CI Run | test-matrix / test-linux-glibc-aarch64 (21, debug)     

🔧 Fix in code (Fix with Cursor).

Test failed after 5 attempts.

CI Run | test-matrix / test-linux-glibc-amd64 (11, debug)     

🔧 Fix in code (Fix with Cursor).

1 failed test in NativeLibrariesTest.java:98 due to assertion failure: org.opentest4j.AssertionFailedError.

CI Run | test-matrix / test-linux-glibc-amd64 (17, debug)     

🔧 Fix in code (Fix with Cursor).

1 failed test. AssertionFailedError at NativeLibrariesTest.java:98.

View all 8 failed jobs.

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