8267130: Memory Overflow in Disassembler::load_library

Co-authored-by: Wang Huang <whuang@openjdk.org>
Co-authored-by: Miao  Zhuojun <mouzhuojun@huawei.com>
Reviewed-by: neliasso, mli

Author: 2 people

src/hotspot/share/compiler/disassembler.cpp

@@ -804,27 +804,39 @@ bool Disassembler::load_library(outputStream* st) {
   // 4. hsdis-<arch>.so  (using LD_LIBRARY_PATH)
   if (jvm_offset >= 0) {
     // 1. <home>/lib/<vm>/libhsdis-<arch>.so
-    strcpy(&buf[jvm_offset], hsdis_library_name);
-    strcat(&buf[jvm_offset], os::dll_file_extension());
-    if (Verbose) st->print_cr("Trying to load: %s", buf);
-    _library = os::dll_load(buf, ebuf, sizeof ebuf);
-    if (_library == NULL && lib_offset >= 0) {
-      // 2. <home>/lib/<vm>/hsdis-<arch>.so
-      strcpy(&buf[lib_offset], hsdis_library_name);
-      strcat(&buf[lib_offset], os::dll_file_extension());
+    if (jvm_offset + strlen(hsdis_library_name) + strlen(os::dll_file_extension()) < JVM_MAXPATHLEN) {
+      strcpy(&buf[jvm_offset], hsdis_library_name);
+      strcat(&buf[jvm_offset], os::dll_file_extension());
       if (Verbose) st->print_cr("Trying to load: %s", buf);
       _library = os::dll_load(buf, ebuf, sizeof ebuf);
+    } else {
+      if (Verbose) st->print_cr("Try to load hsdis library failed: the length of path is beyond the OS limit");
+    }
+    if (_library == NULL && lib_offset >= 0) {
+      // 2. <home>/lib/<vm>/hsdis-<arch>.so
+      if (lib_offset + strlen(hsdis_library_name) + strlen(os::dll_file_extension()) < JVM_MAXPATHLEN) {
+        strcpy(&buf[lib_offset], hsdis_library_name);
+        strcat(&buf[lib_offset], os::dll_file_extension());
+        if (Verbose) st->print_cr("Trying to load: %s", buf);
+        _library = os::dll_load(buf, ebuf, sizeof ebuf);
+      } else {
+        if (Verbose) st->print_cr("Try to load hsdis library failed: the length of path is beyond the OS limit");
+      }
     }
     if (_library == NULL && lib_offset > 0) {
       // 3. <home>/lib/hsdis-<arch>.so
       buf[lib_offset - 1] = '\0';
       const char* p = strrchr(buf, *os::file_separator());
       if (p != NULL) {
         lib_offset = p - buf + 1;
-        strcpy(&buf[lib_offset], hsdis_library_name);
-        strcat(&buf[lib_offset], os::dll_file_extension());
-        if (Verbose) st->print_cr("Trying to load: %s", buf);
-        _library = os::dll_load(buf, ebuf, sizeof ebuf);
+        if (lib_offset + strlen(hsdis_library_name) + strlen(os::dll_file_extension()) < JVM_MAXPATHLEN) {
+          strcpy(&buf[lib_offset], hsdis_library_name);
+          strcat(&buf[lib_offset], os::dll_file_extension());
+          if (Verbose) st->print_cr("Trying to load: %s", buf);
+          _library = os::dll_load(buf, ebuf, sizeof ebuf);
+        } else {
+          if (Verbose) st->print_cr("Try to load hsdis library failed: the length of path is beyond the OS limit");
+        }
       }
     }
   }