[FIX] Disable write_to_testcase - AFLNet does not need it

And remove everything related to out_fd - this generates crashes

Author: remiparrot

afl-fuzz.c

@@ -140,8 +140,8 @@ EXP_ST u8  skip_deterministic,        /* Skip deterministic stages?       */
            deferred_mode,             /* Deferred forkserver mode?        */
            fast_cal;                  /* Try to calibrate faster?         */
 
-static s32 out_fd,                    /* Persistent fd for out_file       */
-           dev_urandom_fd = -1,       /* Persistent fd for /dev/urandom   */
+//static s32 out_fd,                    /* Persistent fd for out_file       */
+static s32 dev_urandom_fd = -1,       /* Persistent fd for /dev/urandom   */
            dev_null_fd = -1,          /* Persistent fd for /dev/null      */
            fsrv_ctl_fd,               /* Fork server control pipe (write) */
            fsrv_st_fd;                /* Fork server status pipe (read)   */
@@ -3116,12 +3116,13 @@ EXP_ST void init_forkserver(char** argv) {
 
       dup2(dev_null_fd, 0);
 
-    } else {
+    }
+    //else {
 
-      dup2(out_fd, 0);
-      close(out_fd);
+    //  dup2(out_fd, 0);
+    //  close(out_fd);
 
-    }
+    //}
 
     /* Set up control and status pipes, close the unneeded original fds. */
 
@@ -3402,12 +3403,13 @@ static u8 run_target(char** argv, u32 timeout) {
 
         dup2(dev_null_fd, 0);
 
-      } else {
+      }
+      //else {
 
-        dup2(out_fd, 0);
-        close(out_fd);
+      //  dup2(out_fd, 0);
+      //  close(out_fd);
 
-      }
+      //}
 
       /* On Linux, would be faster to use O_CLOEXEC. Maybe TODO. */
 
@@ -3559,26 +3561,7 @@ static u8 run_target(char** argv, u32 timeout) {
 
 static void write_to_testcase(void* mem, u32 len) {
 
-  s32 fd = out_fd;
-
-  if (out_file) {
-
-    unlink(out_file); /* Ignore errors. */
-
-    fd = open(out_file, O_WRONLY | O_CREAT | O_EXCL, 0600);
-
-    if (fd < 0) PFATAL("Unable to create '%s'", out_file);
-
-  } else lseek(fd, 0, SEEK_SET);
-
-  ck_write(fd, mem, len, out_file);
-
-  if (!out_file) {
-
-    if (ftruncate(fd, len)) PFATAL("ftruncate() failed");
-    lseek(fd, 0, SEEK_SET);
-
-  } else close(fd);
+  //AFLNet sends data via network so it does not need this function
 
 }
 
@@ -8925,19 +8908,19 @@ EXP_ST void setup_dirs_fds(void) {
 
 /* Setup the output file for fuzzed data, if not using -f. */
 
-EXP_ST void setup_stdio_file(void) {
-
-  u8* fn = alloc_printf("%s/.cur_input", out_dir);
-
-  unlink(fn); /* Ignore errors */
-
-  out_fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600);
-
-  if (out_fd < 0) PFATAL("Unable to create '%s'", fn);
-
-  ck_free(fn);
-
-}
+//EXP_ST void setup_stdio_file(void) {
+//
+//  u8* fn = alloc_printf("%s/.cur_input", out_dir);
+//
+//  unlink(fn); /* Ignore errors */
+//
+//  out_fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600);
+//
+//  if (out_fd < 0) PFATAL("Unable to create '%s'", fn);
+//
+//  ck_free(fn);
+//
+//}
 
 
 /* Make sure that core dumps don't go to a program. */
@@ -9874,7 +9857,7 @@ int main(int argc, char** argv) {
 
   detect_file_args(argv + optind + 1);
 
-  if (!out_file) setup_stdio_file();
+  //if (!out_file) setup_stdio_file();
 
   check_binary(argv[optind]);