What is considered a large resource?

I was trying to find that out in #7 where I tried injecting large files into a tiny hello-world executable and I posted about my findings in nodejs/single-executable#23 (comment).

that is 3.1MB in size, postject provides a very simple error that it failed

@dfellis looking at the command, I'm guessing that happened on Linux? (very curious what the distro name and the arch is) I tried injecting a 16MB file into the official Node.js Linux binary (92 MB) I downloaded from the website and it is able to finish the injection with no errors for me (final executable size - 107 MB). It also ran with no errors.

I can't find any arg to enter a verbose mode, so not sure how to debug further.

Assuming that this is an ELF binary, it means that the error was reported from

postject/src/postject.cpp

Line 48 in 3edd1dd

object.set("result", emscripten::val(InjectResult::kError));

which would happen if

postject/src/postject.cpp

Line 45 in 3edd1dd

LIEF::ELF::Parser::parse(vec_from_val(executable));

returned null. As you said, there were no additional logs, so it probably means that there is a part in LIEF's code where this error happens but it doesn't log about it. To find that out, you would need to build Postject from source on your system and trace the calls inside LIEF's (a C++ dependency of this project that does the actual injection) LIEF::ELF::Parser::parse function -

postject/vendor/lief/src/ELF/Parser.cpp

Lines 346 to 355 in 3edd1dd

    
           std::unique_ptr<Binary> Parser::parse(const std::vector<uint8_t>& data, 
        
                                                 const std::string& name, DYNSYM_COUNT_METHODS count_mtd) { 
        
             if (!is_elf(data)) { 
        
               return nullptr; 
        
             } 
        
             Parser parser{data, count_mtd}; 
        
             parser.init(name); 
        
             return std::move(parser.binary_); 
        
           }

	std::unique_ptr<Binary> Parser::parse(const std::vector<uint8_t>& data,
	const std::string& name, DYNSYM_COUNT_METHODS count_mtd) {
	if (!is_elf(data)) {
	return nullptr;
	}

	Parser parser{data, count_mtd};
	parser.init(name);
	return std::move(parser.binary_);
	}

Uh oh!

Add a test injecting a large resource #12

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