From 29d539751a6df5178cfc880795f293a5f046e3d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alessandro=C2=A0Decina?= <alessandro.d@gmail.com>
Date: Sat, 16 Apr 2022 10:12:11 +0000
Subject: [PATCH] ebpf: add fallback memcpy

Add simplest possible memcpy that the verifier should never trip on
---
 bpf/aya-bpf/src/lib.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/bpf/aya-bpf/src/lib.rs b/bpf/aya-bpf/src/lib.rs
index 6f7a384d8..688708d1d 100644
--- a/bpf/aya-bpf/src/lib.rs
+++ b/bpf/aya-bpf/src/lib.rs
@@ -43,3 +43,12 @@ pub unsafe extern "C" fn memset(s: *mut u8, c: c_int, n: usize) {
         *((base + i) as *mut u8) = c as u8;
     }
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn memcpy(dest: *mut u8, src: *mut u8, n: usize) {
+    let dest_base = dest as usize;
+    let src_base = src as usize;
+    for i in 0..n {
+        *((dest_base + i) as *mut u8) = *((src_base + i) as *mut u8);
+    }
+}