minor documentation update

3 files changed, 7 insertions, 3 deletions

diff --git a/docs/QuickStartGuide.txt b/docs/QuickStartGuide.txt
index abe7032f..e94b26ed 100644
--- a/docs/QuickStartGuide.txt
+++ b/docs/QuickStartGuide.txt
@@ -12,6 +12,8 @@ how to hit the ground running:
    If testing a network service, modify it to run in the foreground and read
    from stdin. When fuzzing a format that uses checksums, comment out the
    checksum verification code, too.
+   If this is not possible (e.g. in -Q(emu) mode) then use AFL_POST_LIBRARY
+   to calculate the values with your own library.
 
    The program must crash properly when a fault is encountered. Watch out for
    custom SIGSEGV or SIGABRT handlers and background processes. For tips on
diff --git a/docs/README b/docs/README
index d1b05b5a..9c81a788 100644
--- a/docs/README
+++ b/docs/README
@@ -439,7 +439,7 @@ Here are some of the most important caveats for AFL:
     To work around this, you can comment out the relevant checks (see
     experimental/libpng_no_checksum/ for inspiration); if this is not possible,
     you can also write a postprocessor, as explained in
-    experimental/post_library/.
+    experimental/post_library/ (with AFL_POST_LIBRARY)
 
   - There are some unfortunate trade-offs with ASAN and 64-bit binaries. This
     isn't due to any specific fault of afl-fuzz; see notes_for_asan.txt for
diff --git a/test-instr.c b/test-instr.c
index 09a1c9f7..1b978c55 100644
--- a/test-instr.c
+++ b/test-instr.c
@@ -22,15 +22,17 @@ int main(int argc, char** argv) {
 
   char buf[8];
 
-  if (read(0, buf, 8) < 1) {
+  if (read(0, buf, sizeof(buf)) < 1) {
     printf("Hum?\n");
     exit(1);
   }
 
   if (buf[0] == '0')
     printf("Looks like a zero to me!\n");
+  else if (buf[0] == '1')
+    printf("Pretty sure that is a one!\n");
   else
-    printf("A non-zero value? How quaint!\n");
+    printf("Neither one or zero? How quaint!\n");
 
   exit(0);