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-rw-r--r--test/asan/TestCases/Posix/dlclose-test.cc106
1 files changed, 106 insertions, 0 deletions
diff --git a/test/asan/TestCases/Posix/dlclose-test.cc b/test/asan/TestCases/Posix/dlclose-test.cc
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+++ b/test/asan/TestCases/Posix/dlclose-test.cc
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+// Regression test for
+// http://code.google.com/p/address-sanitizer/issues/detail?id=19
+// Bug description:
+// 1. application dlopens foo.so
+// 2. asan registers all globals from foo.so
+// 3. application dlcloses foo.so
+// 4. application mmaps some memory to the location where foo.so was before
+// 5. application starts using this mmaped memory, but asan still thinks there
+// are globals.
+// 6. BOOM
+
+// This sublte test assumes that after a foo.so is dlclose-d
+// we can mmap the region of memory that has been occupied by the library.
+// It works on i368/x86_64 Linux, but not necessary anywhere else.
+// REQUIRES: x86_64-supported-target,i386-supported-target
+
+// RUN: %clangxx_asan -O0 -DSHARED_LIB %s -fPIC -shared -o %t-so.so
+// RUN: %clangxx_asan -O0 %s %libdl -o %t && %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_asan -O1 -DSHARED_LIB %s -fPIC -shared -o %t-so.so
+// RUN: %clangxx_asan -O1 %s %libdl -o %t && %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_asan -O2 -DSHARED_LIB %s -fPIC -shared -o %t-so.so
+// RUN: %clangxx_asan -O2 %s %libdl -o %t && %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_asan -O3 -DSHARED_LIB %s -fPIC -shared -o %t-so.so
+// RUN: %clangxx_asan -O3 %s %libdl -o %t && %run %t 2>&1 | FileCheck %s
+
+#if !defined(SHARED_LIB)
+#include <assert.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include <string>
+
+#if defined(__FreeBSD__)
+// The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
+// that, it was never implemented. So just define it to zero.
+#undef MAP_NORESERVE
+#define MAP_NORESERVE 0
+#endif
+
+using std::string;
+
+typedef int *(fun_t)();
+
+int main(int argc, char *argv[]) {
+ string path = string(argv[0]) + "-so.so";
+ size_t PageSize = sysconf(_SC_PAGESIZE);
+ printf("opening %s ... \n", path.c_str());
+ void *lib = dlopen(path.c_str(), RTLD_NOW);
+ if (!lib) {
+ printf("error in dlopen(): %s\n", dlerror());
+ return 1;
+ }
+ fun_t *get = (fun_t*)dlsym(lib, "get_address_of_static_var");
+ if (!get) {
+ printf("failed dlsym\n");
+ return 1;
+ }
+ int *addr = get();
+ assert(((size_t)addr % 32) == 0); // should be 32-byte aligned.
+ printf("addr: %p\n", addr);
+ addr[0] = 1; // make sure we can write there.
+
+ // Now dlclose the shared library.
+ printf("attempting to dlclose\n");
+ if (dlclose(lib)) {
+ printf("failed to dlclose\n");
+ return 1;
+ }
+ // Now, the page where 'addr' is unmapped. Map it.
+ size_t page_beg = ((size_t)addr) & ~(PageSize - 1);
+ void *res = mmap((void*)(page_beg), PageSize,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, -1, 0);
+ if (res == (char*)-1L) {
+ printf("failed to mmap\n");
+ return 1;
+ }
+ addr[1] = 2; // BOOM (if the bug is not fixed).
+ printf("PASS\n");
+ // CHECK: PASS
+ return 0;
+}
+#else // SHARED_LIB
+#include <stdio.h>
+
+static int pad1;
+static int static_var;
+static int pad2;
+
+extern "C"
+int *get_address_of_static_var() {
+ return &static_var;
+}
+
+__attribute__((constructor))
+void at_dlopen() {
+ printf("%s: I am being dlopened\n", __FILE__);
+}
+__attribute__((destructor))
+void at_dlclose() {
+ printf("%s: I am being dlclosed\n", __FILE__);
+}
+#endif // SHARED_LIB