Dump linux vDSO symbols

breakpad.sh

@@ -12,9 +12,9 @@ if [ ! -d "depot_tools" ]; then
 fi
 
 if [ ! -d "src" ]; then
-  ./depot_tools/fetch --nohooks breakpad
+  PYTHONDONTWRITEBYTECODE=1 python2.7 ./depot_tools/fetch.py --nohooks breakpad
 else
-  ./depot_tools/gclient sync --nohooks
+  PYTHONDONTWRITEBYTECODE=1 python2.7 ./depot_tools/gclient.py sync --nohooks
 fi
 
 if [ ! -d "build" ]; then

extension/extension.cpp

@@ -487,6 +487,35 @@ class UploadThread: public IThread
 #if defined _LINUX
 	bool UploadSymbolFile(const google_breakpad::CodeModule *module, const char *presubmitToken) {
 		auto debugFile = module->debug_file();
+		std::string vdsoOutputPath = "";
+
+		if (debugFile == "linux-gate.so") {
+			char vdsoOutputPathBuffer[512];
+			g_pSM->BuildPath(Path_SM, vdsoOutputPathBuffer, sizeof(vdsoOutputPathBuffer), "data/dumps/linux-gate.so");
+			vdsoOutputPath = vdsoOutputPathBuffer;
+			int auxvStart = 0;
+			while (environ[auxvStart++] != nullptr);
+			struct {
+				int id;
+				void *value;
+			} *auxvEntry = (decltype(auxvEntry))&environ[auxvStart];
+			for (int auxvIndex = 0; true; ++auxvIndex) {
+				if (auxvEntry[auxvIndex].id == 0) break;
+				if (auxvEntry[auxvIndex].id != 33) continue; // AT_SYSINFO_EHDR
+				Elf32_Ehdr *vdsoHdr = (Elf32_Ehdr *)auxvEntry[auxvIndex].value;
+				auto vdsoSize = vdsoHdr->e_shoff + (vdsoHdr->e_shentsize * vdsoHdr->e_shnum);
+				void *vdsoBuffer = malloc(vdsoSize);
+				memcpy(vdsoBuffer, vdsoHdr, vdsoSize);
+				FILE *vdsoFile = fopen(vdsoOutputPath.c_str(), "wb");
+				if (vdsoFile) {
+					fwrite(vdsoBuffer, 1, vdsoSize, vdsoFile);
+					fclose(vdsoFile);
+					debugFile = vdsoOutputPath;
+				}
+				free(vdsoBuffer);
+			}
+		}
+
 		if (debugFile[0] != '/') {
 			return false;
 		}
@@ -522,6 +551,10 @@ class UploadThread: public IThread
 		// output = output.substr(0, output.find("\n"));
 		// printf(">>> %s\n", output.c_str());
 
+		if (debugFile == vdsoOutputPath) {
+			unlink(vdsoOutputPath.c_str());
+		}
+
 		IWebForm *form = webternet->CreateForm();
 
 		const char *minidumpAccount = g_pSM->GetCoreConfigValue("MinidumpAccount");
@@ -691,6 +724,10 @@ class UploadThread: public IThread
 		const auto &codeFile = module->code_file();
 
 #ifndef WIN32
+		if (codeFile == "linux-gate.so") {
+			return kMTSystem;
+		}
+
 		if (codeFile[0] != '/') {
 #else
 		if (codeFile[1] != ':') {

test/test.cpp

@@ -237,6 +237,35 @@ int main(int argc, char *argv[])
 			auto module = processState.modules()->GetModuleAtIndex(moduleIndex);
 
 			auto debugFile = module->debug_file();
+			std::string vdsoOutputPath = "";
+
+			if (debugFile == "linux-gate.so") {
+				auto workingDir = getcwd(nullptr, 0);
+				vdsoOutputPath = workingDir + std::string("/linux-gate.so");
+				int auxvStart = 0;
+				while (environ[auxvStart++] != nullptr);
+				struct {
+					int id;
+					void *value;
+				} *auxvEntry = (decltype(auxvEntry))&environ[auxvStart];
+				for (int auxvIndex = 0; true; ++auxvIndex) {
+					if (auxvEntry[auxvIndex].id == 0) break;
+					if (auxvEntry[auxvIndex].id != 33) continue; // AT_SYSINFO_EHDR
+					Elf32_Ehdr *vdsoHdr = (Elf32_Ehdr *)auxvEntry[auxvIndex].value;
+					auto vdsoSize = vdsoHdr->e_shoff + (vdsoHdr->e_shentsize * vdsoHdr->e_shnum);
+					void *vdsoBuffer = malloc(vdsoSize);
+					memcpy(vdsoBuffer, vdsoHdr, vdsoSize);
+					FILE *vdsoFile = fopen(vdsoOutputPath.c_str(), "wb");
+					if (vdsoFile) {
+						fwrite(vdsoBuffer, 1, vdsoSize, vdsoFile);
+						fclose(vdsoFile);
+						debugFile = vdsoOutputPath;
+					}
+					free(vdsoBuffer);
+				}
+				free(workingDir);
+			}
+
 			if (debugFile[0] != '/') {
 				continue;
 			}
@@ -272,6 +301,10 @@ int main(int argc, char *argv[])
 			auto output = outputStream.str();
 			output = output.substr(0, output.find("\n"));
 			printf("%s\n", output.c_str());
+
+			if (debugFile == vdsoOutputPath) {
+				unlink(vdsoOutputPath.c_str());
+			}
 		}
 #endif
 	}