fix afl-cmin* for old afl vanilla issue

afl-cmin

@@ -318,7 +318,9 @@ BEGIN {
 
   if (!nyx_mode && target_bin && !exists_and_is_executable(target_bin)) {
 
-    "command -v "target_bin" 2>/dev/null" | getline tnew
+    cmd = "command -v "target_bin" 2>/dev/null"
+    cmd | getline tnew
+    close(cmd)
     if (!tnew || !exists_and_is_executable(tnew)) {
       print "[-] Error: binary '"target_bin"' not found or not executable." > "/dev/stderr"
       exit 1
@@ -330,6 +332,7 @@ BEGIN {
     echo "[!] Trying to obtain the map size of the target ..."
     get_map_size = "AFL_DUMP_MAP_SIZE=1 " target_bin
     get_map_size | getline mapsize
+    close(get_map_size)
     if (mapsize && mapsize > 65535 && mapsize < 100000000) {
       AFL_MAP_SIZE = "AFL_MAP_SIZE="mapsize" "
       print "[+] Setting "AFL_MAP_SIZE
@@ -359,14 +362,18 @@ BEGIN {
   system("rm -rf "trace_dir" 2>/dev/null");
   system("rm "out_dir"/id[:_]* 2>/dev/null")
 
-  "ls "out_dir"/* 2>/dev/null | wc -l" | getline noofentries
+  cmd = "ls "out_dir"/* 2>/dev/null | wc -l"
+  cmd | getline noofentries
+  close(cmd)
   if (0 == system( "test -d "out_dir" -a "noofentries" -gt 0" )) {
     print "[-] Error: directory '"out_dir"' exists and is not empty - delete it first." > "/dev/stderr"
     exit 1
   }
 
   if (threads) {
-    "nproc" | getline nproc
+    cmd = "nproc"
+    cmd | getline nproc
+    close(cmd)
     if (threads == "all") {
       threads = nproc
     } else {
@@ -386,12 +393,14 @@ BEGIN {
   if (stdin_file) {
     # truncate input file
     printf "" > stdin_file
-    close( stdin_file )
+    close(stdin_file)
   }
 
   # First we look in PATH
   if (0 == system("command -v afl-showmap >/dev/null 2>&1")) {
-    "command -v afl-showmap 2>/dev/null" | getline showmap
+    cmd = "command -v afl-showmap 2>/dev/null"
+    cmd | getline showmap
+    close(cmd)
   } else {
     # then we look in the current directory
     if (0 == system("test -x ./afl-showmap")) {
@@ -413,7 +422,9 @@ BEGIN {
   # yuck, gnu stat is option incompatible to bsd stat
   # we use a heuristic to differentiate between
   # GNU stat and other stats
-  "stat --version 2>/dev/null" | getline statversion
+  cmd = "stat --version 2>/dev/null"
+  cmd | getline statversion
+  close(cmd)
   if (statversion ~ /GNU coreutils/) {
     stat_format = "-c '%s %n'" # GNU
   } else {
@@ -432,6 +443,7 @@ BEGIN {
     infilesSmallToBigFullMap[infilesSmallToBigFull[i]] = infilesSmallToBig[i]
     i++
   }
+  close(cmdline)
   in_count = i
 
   first_file = infilesSmallToBigFull[0]
@@ -468,6 +480,7 @@ BEGIN {
     while ((getline < runtest) > 0) {
       ++first_count
     }
+    close(runtest)
 
     if (first_count) {
       print "[+] OK, "first_count" tuples recorded."
@@ -582,6 +595,15 @@ BEGIN {
     else { print "    Processing file "cur"/"in_count }
     # create path for the trace file from afl-showmap
     tracefile_path = trace_dir"/"fn
+    # ensure the file size is not zero
+    cmd = "du -b "tracefile_path
+    "ls -l "tracefile_path
+    cmd | getline output
+    close(cmd)
+    split(output, result, "\t")
+    if (result[1] == 0) {
+      print "[!] WARNING: file "fn" is crashing the target, ignoring..."
+    }
     # gather all keys, and count them
     while ((getline line < tracefile_path) > 0) {
         key = line
@@ -643,6 +665,7 @@ BEGIN {
     }
   }
   close(sortedKeys)
+  print ""
   print "[+] Found "tuple_count" unique tuples across "in_count" files."
 
   if (out_count == 1) {

afl-cmin.bash

@@ -479,7 +479,7 @@ else
   echo "[+] all $THREADS running tasks completed."
   rm -f ${TMPFILE}*
 
-  echo trace dir files: $(ls $TRACE_DIR/*|wc -l)
+  #echo trace dir files: $(ls $TRACE_DIR/*|wc -l)
 
 fi
 
@@ -523,6 +523,8 @@ ls -rS "$IN_DIR" | while read -r fn; do
 
   sed "s#\$# $fn#" "$TRACE_DIR/$fn" >>"$TRACE_DIR/.candidate_list"
 
+  test -s "$TRACE_DIR/$fn" || echo Warning: $fn is ignored because of crashing the target
+
 done
 
 echo

docs/Changelog.md

@@ -14,6 +14,10 @@
       command line tool! See custom_mutators/aflpp/standalone/
     - display the state of the fuzzing run in the UI :-)
     - fix timeout setting if '+' is used or a session is restarted
+  - afl-cmin/afl-cmin.bash:
+    - fixed a bug inherited from vanilla AFL where a coverage of
+      map[123] = 11 would be the same as map[1123] = 1
+    - warn on crashing inputs
 
 
 ### Version ++4.07c (release)

src/afl-showmap.c

@@ -243,7 +243,8 @@ static void analyze_results(afl_forkserver_t *fsrv) {
 
       total += fsrv->trace_bits[i];
       if (fsrv->trace_bits[i] > highest) highest = fsrv->trace_bits[i];
-      if (!coverage_map[i]) { coverage_map[i] = 1; }
+      // if (!coverage_map[i]) { coverage_map[i] = 1; }
+      coverage_map[i] |= fsrv->trace_bits[i];
 
     }
 
@@ -328,7 +329,7 @@ static u32 write_results_to_file(afl_forkserver_t *fsrv, u8 *outfile) {
 
       if (cmin_mode) {
 
-        fprintf(f, "%u%u\n", fsrv->trace_bits[i], i);
+        fprintf(f, "%u%03u\n", i, fsrv->trace_bits[i]);
 
       } else {