Documents E_FLAGS_OFFSET.

solana-labs · Nov 14, 2024 · 821c03b · 821c03b
1 parent 364c6ec
commit 821c03b
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/elf.rs b/src/elf.rs
@@ -372,7 +372,12 @@ impl<C: ContextObject> Executable<C> {
 
     /// Fully loads an ELF
     pub fn load(bytes: &[u8], loader: Arc<BuiltinProgram<C>>) -> Result<Self, ElfError> {
-        let e_flags = LittleEndian::read_u32(bytes.get(48..52).ok_or(ElfParserError::OutOfBounds)?);
+        const E_FLAGS_OFFSET: usize = 48;
+        let e_flags = LittleEndian::read_u32(
+            bytes
+                .get(E_FLAGS_OFFSET..E_FLAGS_OFFSET.saturating_add(std::mem::size_of::<u32>()))
+                .ok_or(ElfParserError::OutOfBounds)?,
+        );
         let config = loader.get_config();
         let sbpf_version = if config.enabled_sbpf_versions.end() == &SBPFVersion::V1 {
             if e_flags == EF_SBPF_V2 {