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-rw-r--r--llvm_mode/afl-clang-fast.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/llvm_mode/afl-clang-fast.c b/llvm_mode/afl-clang-fast.c
index 0e388cf4..657d1a84 100644
--- a/llvm_mode/afl-clang-fast.c
+++ b/llvm_mode/afl-clang-fast.c
@@ -544,9 +544,12 @@ int main(int argc, char **argv, char **envp) {
       instrument_mode = INSTRUMENT_PCGUARD;
     else if (strncasecmp(ptr, "lto", strlen("lto")) == 0)
       instrument_mode = INSTRUMENT_LTO;
-    else if (strncasecmp(ptr, "ctx", strlen("ctx")) == 0)
+    else if (strncasecmp(ptr, "ctx", strlen("ctx")) == 0) {
+
       instrument_mode = INSTRUMENT_CTX;
-    else if (strncasecmp(ptr, "ngram", strlen("ngram")) == 0) {
+      setenv("AFL_LLVM_CTX", "1", 1);
+
+    } else if (strncasecmp(ptr, "ngram", strlen("ngram")) == 0) {
 
       ptr += strlen("ngram");
       while (*ptr && (*ptr < '0' || *ptr > '9'))