selftests/sgx: Dump enclave memory map

Often, it's useful to check whether /proc/self/maps looks sane when
dealing with memory mapped objects, especially when they are JIT'ish
dynamically constructed objects. Therefore, dump "/dev/sgx_enclave"
matching lines from the memory map in FIXTURE_SETUP().
Signed-off-by: NJarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/sgx/main.c

@@ -117,6 +117,8 @@ FIXTURE_SETUP(enclave)
 	Elf64_Sym *sgx_enter_enclave_sym = NULL;
 	struct vdso_symtab symtab;
 	struct encl_segment *seg;
+	char maps_line[256];
+	FILE *maps_file;
 	unsigned int i;
 	void *addr;
 
@@ -167,6 +169,18 @@ FIXTURE_SETUP(enclave)
 	memset(&self->run, 0, sizeof(self->run));
 	self->run.tcs = self->encl.encl_base;
 
+	maps_file = fopen("/proc/self/maps", "r");
+	if (maps_file != NULL)  {
+		while (fgets(maps_line, sizeof(maps_line), maps_file) != NULL) {
+			maps_line[strlen(maps_line) - 1] = '\0';
+
+			if (strstr(maps_line, "/dev/sgx_enclave"))
+				TH_LOG("%s", maps_line);
+		}
+
+		fclose(maps_file);
+	}
+
 err:
 	if (!sgx_enter_enclave_sym)
 		encl_delete(&self->encl);