Detect rust by looking at the symbols table.

Some binaries don't include the name directly in strtab,
so we need to look at the global functions in the symbols tableand allocate their name to find if they are rust binaries.

Signed-off-by: David Calavera <david.calavera@gmail.com>

Author: calavera

Cargo.toml

@@ -16,7 +16,7 @@ default = ["console_error_panic_hook"]
 
 [dependencies]
 wasm-bindgen = "0.2.63"
-goblin = { version = "0.2", default-features = false, features = ["elf32", "elf64", "endian_fd"] }
+goblin = { version = "0.2", default-features = false, features = ["alloc", "elf32", "elf64", "endian_fd"] }
 
 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires

src/lib.rs

@@ -1,4 +1,4 @@
-use goblin::elf::Elf;
+use goblin::{elf::sym, elf::Elf};
 
 mod utils;
 
@@ -49,5 +49,15 @@ pub fn detect(data: &[u8]) -> Result<Option<Runtime>, JsValue> {
         }
     }
 
+    for s in elf.syms.iter() {
+        if s.is_function() && s.st_bind() == sym::STB_GLOBAL {
+            if let Some(Ok(sym_name)) = elf.strtab.get(s.st_name) {
+                if sym_name == RUST_PERSONALITY {
+                    return Ok(Some(Runtime::Rust));
+                }
+            }
+        }
+    }
+
     Ok(None)
 }