Fix frida ASAN incompatibility with mac m1 (#917)

Add MAP_JIT, and extract the writable portion of generate_instrumentation_blobs into AsanRuntime

libafl_frida/src/asan/asan_rt.rs

@@ -103,6 +103,13 @@ pub const ASAN_SAVE_REGISTER_NAMES: [&str; ASAN_SAVE_REGISTER_COUNT] = [
 #[cfg(target_arch = "aarch64")]
 pub const ASAN_SAVE_REGISTER_COUNT: usize = 32;
 
+#[cfg(target_arch = "aarch64")]
+const ASAN_EH_FRAME_DWORD_COUNT: usize = 14;
+#[cfg(target_arch = "aarch64")]
+const ASAN_EH_FRAME_FDE_OFFSET: u32 = 20;
+#[cfg(target_arch = "aarch64")]
+const ASAN_EH_FRAME_FDE_ADDRESS_OFFSET: u32 = 28;
+
 /// The frida address sanitizer runtime, providing address sanitization.
 /// When executing in `ASAN`, each memory access will get checked, using frida stalker under the hood.
 /// The runtime can report memory errors that occurred during execution,
@@ -131,6 +138,9 @@ pub struct AsanRuntime {
     module_map: Option<ModuleMap>,
     suppressed_addresses: Vec<usize>,
     shadow_check_func: Option<extern "C" fn(*const c_void, usize) -> bool>,
+
+    #[cfg(target_arch = "aarch64")]
+    eh_frame: [u32; ASAN_EH_FRAME_DWORD_COUNT],
 }
 
 impl Debug for AsanRuntime {
@@ -304,6 +314,9 @@ impl AsanRuntime {
             module_map: None,
             suppressed_addresses: Vec::new(),
             shadow_check_func: None,
+
+            #[cfg(target_arch = "aarch64")]
+            eh_frame: [0; ASAN_EH_FRAME_DWORD_COUNT],
         }
     }
 
@@ -1641,18 +1654,33 @@ impl AsanRuntime {
         );
 
         let blob = ops.finalize().unwrap();
+        let mut map_flags = MapFlags::MAP_ANON | MapFlags::MAP_PRIVATE;
+
+        // apple aarch64 requires MAP_JIT to allocates WX pages
+        #[cfg(all(target_vendor = "apple", target_arch = "aarch64"))]
+        map_flags |= MapFlags::MAP_JIT;
+
         unsafe {
             let mapping = mmap(
                 std::ptr::null_mut(),
                 0x1000,
                 ProtFlags::all(),
-                MapFlags::MAP_ANON | MapFlags::MAP_PRIVATE,
+                map_flags,
                 -1,
                 0,
             )
             .unwrap();
+
+            // on apple aarch64, WX pages can't be both writable and executable at the same time.
+            // pthread_jit_write_protect_np flips them from executable (1) to writable (0)
+            #[cfg(all(target_vendor = "apple", target_arch = "aarch64"))]
+            libc::pthread_jit_write_protect_np(0);
+
             blob.as_ptr()
                 .copy_to_nonoverlapping(mapping as *mut u8, blob.len());
+                
+            #[cfg(all(target_vendor = "apple", target_arch = "aarch64"))]
+            libc::pthread_jit_write_protect_np(1);
             self.shadow_check_func = Some(std::mem::transmute(mapping as *mut u8));
         }
     }
@@ -1967,8 +1995,10 @@ impl AsanRuntime {
             ; stp x0, x1, [x28]
 
             ; adr x25, <report
-            ; adr x0, >eh_frame_fde
+            ; adr x15, >eh_frame_cie_addr
-            ; adr x27, >fde_address
+            ; ldr x15, [x15]
+            ; add x0, x15, ASAN_EH_FRAME_FDE_OFFSET // eh_frame_fde
+            ; add x27, x15, ASAN_EH_FRAME_FDE_ADDRESS_OFFSET // fde_address
             ; ldr w26, [x27]
             ; cmp w26, #0x0
             ; b.ne >skip_register
@@ -2013,29 +2043,25 @@ impl AsanRuntime {
             ; .qword AsanRuntime::handle_trap as *mut c_void as i64
             ; register_frame_func:
             ; .qword __register_frame as *mut c_void as i64
-            ; eh_frame_cie:
+            ; eh_frame_cie_addr:
-            ; .dword 0x14
+            ; .qword addr_of_mut!(self.eh_frame) as i64
-            ; .dword 0x00
-            ; .dword 0x00527a01
-            ; .dword 0x011e7c01
-            ; .dword 0x001f0c1b
-            ; eh_frame_fde:
-            ; .dword 0x14
-            ; .dword 0x18
-            ; fde_address:
-            ; .dword 0x0 // <-- address offset goes here
-            ; .dword 0x104
-                //advance_loc 12
-                //def_cfa r29 (x29) at offset 16
-                //offset r30 (x30) at cfa-8
-                //offset r29 (x29) at cfa-16
-            ; .dword 0x1d0c4c00
-            ; .dword 0x9d029e10u32 as i32
-            ; .dword 0x04
-            // empty next FDE:
-            ; .dword 0x0
-            ; .dword 0x0
         );
+        self.eh_frame = [
+            0x14, 0, 0x00527a01, 0x011e7c01, 0x001f0c1b,
+            // eh_frame_fde
+            0x14, 0x18,
+            // fde_address
+            0, // <-- address offset goes here
+            0x104, 
+            // advance_loc 12
+            // def_cfa r29 (x29) at offset 16
+            // offset r30 (x30) at cfa-8
+            // offset r29 (x29) at cfa-16
+            0x1d0c4c00, 0x9d029e10, 0x4,
+            // empty next FDE:
+            0, 0
+        ];
+
         self.blob_report = Some(ops_report.finalize().unwrap().into_boxed_slice());
 
         self.blob_check_mem_byte = Some(self.generate_shadow_check_blob(0));