afl-untracer: Mac M1 build update proposal.
MODIFY
utils/afl_untracer/afl-untracer.c
utils/afl_untracer/afl-untracer.c
#include <sys/shm.h>
#include <sys/wait.h>
#include <sys/types.h>
-#include <sys/personality.h>
#if defined(__linux__)
+ #include <sys/personality.h>
#include <sys/ucontext.h>
#elif defined(__APPLE__) && defined(__LP64__)
#include <mach-o/dyld_images.h>
@@ -480,6 +480,9 @@ void setup_trap_instrumentation(void) {
// Index into the coverage bitmap for the current trap instruction.
#ifdef __aarch64__
uint64_t bitmap_index = 0;
+#ifdef __APPLE__
+ pthread_jit_write_protect_np(0);
+#endif
#else
uint32_t bitmap_index = 0;
#endif
@@ -508,7 +511,6 @@ void setup_trap_instrumentation(void) {
lib_size);
lib_addr = (u8 *)lib_base->addr_start;
-
// Make library code writable.
if (mprotect((void *)lib_addr, lib_size,
PROT_READ | PROT_WRITE | PROT_EXEC) != 0)
@@ -625,8 +627,13 @@ static void sigtrap_handler(int signum, siginfo_t *si, void *context) {
// Must re-execute the instruction, so decrement PC by one instruction.
ucontext_t *ctx = (ucontext_t *)context;
#if defined(__APPLE__) && defined(__LP64__)
+#if defined(__x86_64__)
ctx->uc_mcontext->__ss.__rip -= 1;
addr = ctx->uc_mcontext->__ss.__rip;
+#else
+ ctx->uc_mcontext->__ss.__pc -= 4;
+ addr = ctx->uc_mcontext->__ss.__pc;
+#endif
#elif defined(__linux__)
#if defined(__x86_64__) || defined(__i386__)
ctx->uc_mcontext.gregs[REG_RIP] -= 1;
@@ -676,7 +683,9 @@ static void sigtrap_handler(int signum, siginfo_t *si, void *context) {
/* the MAIN function */
int main(int argc, char *argv[]) {
+#if defined(__linux__)
(void)personality(ADDR_NO_RANDOMIZE); // disable ASLR
+#endif
pid = getpid();
if (getenv("AFL_DEBUG")) debug = 1;

afl-untracer: Mac M1 build update proposal.