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fix(il2cpp): consume resolved ELF program declarations

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Retain relevant program facts in the shared native directory and consume them for mappings and relocations. Remove redundant table coordinates and presence flags. This preserves extended program counts so PT_DYNAMIC beyond the raw sentinel remains visible, while load and relocation admission keep their distinct policies.
This commit is contained in:
morluto
2026-10-24 09:13:52 +08:00
parent b6519aa410
commit 87745af52a
7 changed files with 149 additions and 64 deletions
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tests/boundary/il2cpp/il2cppBinaryFile.test.ts
+53
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@@ -1,4 +1,5 @@
import { Il2cppBinaryFormatFailure } from "../../../src/il2cpp/Il2cppBinaryFormat.js";
import { readBinaryContainer } from "../../../src/native/metadata/readBinaryContainer.js";
import {
openImageSteps,
readUInt32,
@@ -480,6 +481,58 @@ it("links an ELF shared object after applying its RELATIVE relocations", () => {
expect(link(elf)).toEqual({ ...fromMacho, format: "elf" });
});
it.each([183, 62])(
"links ELF relocations using the resolved PN_XNUM program count (machine %s)",
(machine) => {
const original = createElfFixture(createIl2cppBinaryFixture(), { machine });
const count = 65536;
const table = original.length;
const sectionZero = table + count * 56;
const extended = Buffer.concat([original, Buffer.alloc(count * 56 + 64)]);
// Keep mapped payload bytes untouched; the last declaration is beyond
// the raw 0xffff sentinel that the old relocation scan treated as a count.
original.copy(extended, table, 64, 120);
original.copy(extended, table + (count - 1) * 56, 120, 176);
extended.writeBigUInt64LE(BigInt(table), 32);
extended.writeBigUInt64LE(BigInt(sectionZero), 40);
extended.writeUInt16LE(0xffff, 56);
extended.writeUInt16LE(64, 58);
extended.writeUInt16LE(1, 60);
extended.writeUInt32LE(count, sectionZero + 44);
expect(link(extended).method_addresses).toEqual(
link(original).method_addresses,
);
},
);
it("ignores undefined PT_NULL fields while linking ELF relocations", () => {
const original = createElfFixture(createIl2cppBinaryFixture());
const bytes = Buffer.from(original);
bytes.writeUInt16LE(3, 56);
bytes.fill(0xff, 176, 232);
bytes.writeUInt32LE(0, 176);
expect(link(bytes).method_addresses).toEqual(link(original).method_addresses);
});
it.each(["outside", "misaligned", "duplicate"] as const)(
"refuses a %s dynamic declaration at relocation admission",
(shape) => {
const bytes = createElfFixture(createIl2cppBinaryFixture());
if (shape === "outside") bytes.writeBigUInt64LE(1n << 63n, 128);
else if (shape === "misaligned") bytes.writeBigUInt64LE(17n, 152);
else {
bytes.copy(bytes, 176, 120, 176);
bytes.writeUInt16LE(3, 56);
}
expect(() => readBinaryContainer(bytes)).not.toThrow();
expect(() => link(bytes)).toThrow(
shape === "duplicate"
? "multiple PT_DYNAMIC segments"
: "PT_DYNAMIC is truncated or outside the file",
);
},
);
it.each([
[{ dynamic: false }, "unsupported-container"],
[{ machine: 243 }, "unsupported-container"],