Fix endianness of coverage data on big endian systems

Mist1987 · Jul 29, 2022 · f2b7104 · f2b7104
1 parent c6af98b
commit f2b7104
Show file tree

Hide file tree

Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/frida_mode/README.md b/frida_mode/README.md
@@ -151,6 +151,7 @@ instances run CMPLOG mode and instrumentation of the binary is less frequent
 * `AFL_FRIDA_INST_DEBUG_FILE` - File to write raw assembly of original blocks
   and their instrumented counterparts during block compilation.
 
+```
 Creating block for 0x7ffff7953313:
         0x7ffff7953313  mov qword ptr [rax], 0
         0x7ffff795331a  add rsp, 8
@@ -166,7 +167,7 @@ Generated block 0x7ffff75e98e2
 
 
   ***
-  ```
+```
 * `AFL_FRIDA_INST_CACHE_SIZE` - Set the size of the instrumentation cache used
 as a look-up table to cache real to instrumented address block translations.
 Default is 256Mb.

diff --git a/frida_mode/src/instrument/instrument_coverage.c b/frida_mode/src/instrument/instrument_coverage.c
@@ -317,6 +317,12 @@ static void coverage_write_events(void *key, void *value, void *user_data) {
 
   };
 
+#if (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+  evt.offset = __builtin_bswap32(evt.offset);
+  evt.length = __builtin_bswap16(evt.length);
+  evt.module = __builtin_bswap16(evt.module);
+#endif
+
   coverage_write(fd, &evt, sizeof(coverage_event_t));
 
 }