shared mem input for qemu persistent hook

1 files changed, 14 insertions, 5 deletions

diff --git a/examples/qemu_persistent_hook/read_into_rdi.c b/examples/qemu_persistent_hook/read_into_rdi.c
index 6cf66ddf..29087962 100644
--- a/examples/qemu_persistent_hook/read_into_rdi.c
+++ b/examples/qemu_persistent_hook/read_into_rdi.c
@@ -35,16 +35,25 @@ enum {
 
 };
 
-void afl_persistent_hook(uint64_t *regs, uint64_t guest_base) {
+void afl_persistent_hook(uint64_t *regs, uint64_t guest_base,
+                         uint8_t* input_buf, uint32_t input_len) {
 
   // In this example the register RDI is pointing to the memory location
   // of the target buffer, and the length of the input is in RSI.
   // This can be seen with a debugger, e.g. gdb (and "disass main")
 
-  printf("reading into %p\n", regs[R_EDI]);
-  size_t r = read(0, g2h(regs[R_EDI]), 1024);
-  regs[R_ESI] = r;
-  printf("read %ld bytes\n", r);
+  printf("placing input into %p\n", regs[R_EDI]);
+
+  if (input_len > 1024)
+    input_len = 1024;
+  memcpy(g2h(regs[R_EDI]), input_buf, input_len); 
+  regs[R_ESI] = input_len;
 
 }
 
+int afl_persistent_hook_init(void) {
+
+  // 1 for shared memory input (faster), 0 for normal input (you have to use read(), input_buf will be NULL)
+  return 1;
+
+}