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Ask what a stub libprivileged-service-client.so must export (issue 105) - #112
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The AU7200's build-3996334 report is the first trail on which the ladder's verdict is yes: every one of the five locations maps libovprobe.so executable and dlopen loads it, on one launch, in 243 ms, while the engine wall is otherwise the Q80's line for line. So the stub route the Q80 closed is open on this set, and what it needs next is the one thing the firmware will not let us read: the symbols the engine imports from the library it refuses. EngineImports asks the loader instead. It reads libchromium-impl.so's own dynamic section (DT_NEEDED and every undefined dynamic symbol, ELF32 on the set and ELF64 for the harness), dlopens each DT_NEEDED library by soname and then by path in the engine's directory, recording each refusal with the loader's words, and looks every non-weak import up in the process and in each library that loaded. What is left is what a stub must export, by name and kind. It runs on the post-failure probe thread ahead of the permission investigation, every step under a Deadline, and lands as an engine imports: header line, a block in the full report and trail lines. tools/engineimports/run.sh builds a library that needs a libblocked.so made unopenable by permission and holds the census to naming exactly its two symbols; the committed ARM libovprobe.so exercises the ELF32 path.
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Issue 105. The AU7200's
build-3996334report is the first trail on which the ladder's verdict is yes: all five locations maplibovprobe.soexecutable anddlopenloads it, on one launch, in 243 ms, with the engine wall otherwise the Q80's line for line (libchromium-impl.sorefused onlibprivileged-service-client.so: Operation not permitted). The gate that refuses the engine's helper library does not refuse a native library of ours on this firmware. That is the third gate of the stub route, the one the Q80 failed.EngineImports(src/common) asks what the stub must export, since the real library is the file the firmware will not let us open:DT_NEEDEDand every undefined dynamic symbol (ELF32 on the set, ELF64 for the harness).dlopens eachDT_NEEDEDlibrary by soname, then by path in the engine's directory, recording each refusal with the loader's words.FUNC/OBJECT).Runs on the post-failure probe thread after
NativeProbe.Runand ahead ofSmackWall.Investigate(whose last step is the one the Q80 never came back from), every step under aDeadline. Report:engine imports:header line, a what a stub must provide block in the full page, trail lines with up to forty names.tools/engineimports/run.sh: builds a library in this box's architecture needinglibm,libcand alibblocked.somade unopenable by permission; the census must name exactly that library's two symbols (one function, one data object), the refusal with the loader's words, nothing another library provides, no weak import. ELF32 path on the committed ARMlibovprobe.so; a FIFO holds it to a recorded miss; a second call changes nothing.docs/INTERNALS.md: A set that passed the third gate: the AU7200 (issue App doesn't load on Samsung AU7200 (Tizen OS 6.0) #105), with how to read the next report before it exists.CLAUDE.mdhas the harness.Built: all five packages and
OverscanProbe. Harness passes.