[sanitizer] Intercept iconv.

llvm-svn: 195917

1 files changed, 48 insertions, 0 deletions

diff --git a/compiler-rt/lib/msan/lit_tests/iconv.cc b/compiler-rt/lib/msan/lit_tests/iconv.cc
new file mode 100644
index 00000000000..e7c30edd985
--- /dev/null
+++ b/compiler-rt/lib/msan/lit_tests/iconv.cc
@@ -0,0 +1,48 @@
+// RUN: %clangxx_msan -m64 -O0 -g %s -o %t && %t
+// RUN: %clangxx_msan -m64 -O0 -g -DPOSITIVE %s -o %t && not %t |& FileCheck %s
+
+#include <assert.h>
+#include <iconv.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+int main(void) {
+  iconv_t cd = iconv_open("ASCII", "ASCII");
+  assert(cd != (iconv_t)-1);
+
+  char inbuf_[100];
+  strcpy(inbuf_, "sample text");
+  char outbuf_[100];
+  char *inbuf = inbuf_;
+  char *outbuf = outbuf_;
+  size_t inbytesleft = strlen(inbuf_);
+  size_t outbytesleft = sizeof(outbuf_);
+
+#ifdef POSITIVE
+  {
+    char u;
+    char *volatile p = &u;
+    inbuf_[5] = *p;
+  }
+#endif
+
+  size_t res;
+  res = iconv(cd, 0, 0, 0, 0);
+  assert(res != (size_t)-1);
+
+  res = iconv(cd, 0, 0, &outbuf, &outbytesleft);
+  assert(res != (size_t)-1);
+
+  res = iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
+  // CHECK: MemorySanitizer: use-of-uninitialized-value
+  // CHECK: #0 {{.*}} in main {{.*}}iconv.cc:[[@LINE-2]]
+  assert(res != (size_t)-1);
+  assert(inbytesleft == 0);
+
+  assert(memcmp(inbuf_, outbuf_, strlen(inbuf_)) == 0);
+
+  iconv_close(cd);
+  return 0;
+}