Pull in hardened BPF virtual machine (#9931)

2020-05-08 12:37:04 -07:00
parent 57a9996921
commit 84885d79d5
8 changed files with 342 additions and 688 deletions
--- a/programs/bpf_loader/src/allocator_bump.rs
+++ b/programs/bpf_loader/src/allocator_bump.rs
@@ -25,7 +25,7 @@ impl BPFAllocator {

 impl Alloc for BPFAllocator {
    fn alloc(&mut self, layout: Layout) -> Result<u64, AllocErr> {
-        if self.pos + layout.size() as u64 <= self.len {
+        if self.pos.saturating_add(layout.size() as u64) <= self.len {
            let addr = self.start + self.pos;
            self.pos += layout.size() as u64;
            Ok(addr)