Merge #20952: wallet: Add BerkeleyDB version sanity check at init time

ad57fb756b wallet: Add BerkeleyDB version sanity check at init time (Wladimir J. van der Laan)

Pull request description:

  Detect version conflicts between the run-time BerkeleyDB library and the one used during compilation.

  This is very unsafe (can result in anything from crashes to corruption) so shut down when one is detected.

ACKs for top commit:
  decryp2kanon:
    utACK ad57fb7
  achow101:
    ACK ad57fb756b
  theStack:
    utACK ad57fb756b
  meshcollider:
    Code review ACK ad57fb756b

Tree-SHA512: 99cd7d836bffbdeb3d4e14053f7139cc85a6d42e631a3f9a3058a848042446b364faee127500f5acb374616e6a61ab2bedebfac1ba9bc993b4d6227114c2a6c2

src/wallet/bdb.cpp

@@ -723,6 +723,23 @@ bool BerkeleyBatch::TxnAbort()
     return (ret == 0);
 }
 
+bool BerkeleyDatabaseSanityCheck()
+{
+    int major, minor;
+    DbEnv::version(&major, &minor, nullptr);
+
+    /* If the major version differs, or the minor version of library is *older*
+     * than the header that was compiled against, flag an error.
+     */
+    if (major != DB_VERSION_MAJOR || minor < DB_VERSION_MINOR) {
+        LogPrintf("BerkeleyDB database version conflict: header version is %d.%d, library version is %d.%d\n",
+            DB_VERSION_MAJOR, DB_VERSION_MINOR, major, minor);
+        return false;
+    }
+
+    return true;
+}
+
 std::string BerkeleyDatabaseVersion()
 {
     return DbEnv::version(nullptr, nullptr, nullptr);

src/wallet/bdb.h

@@ -223,6 +223,10 @@ public:
 
 std::string BerkeleyDatabaseVersion();
 
+/** Perform sanity check of runtime BDB version versus linked BDB version.
+ */
+bool BerkeleyDatabaseSanityCheck();
+
 //! Return object giving access to Berkeley database at specified path.
 std::unique_ptr<BerkeleyDatabase> MakeBerkeleyDatabase(const fs::path& path, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error);
 

src/wallet/init.cpp

@@ -86,6 +86,11 @@ void WalletInit::AddWalletOptions(ArgsManager& argsman) const
 
 bool WalletInit::ParameterInteraction() const
 {
+#ifdef USE_BDB
+     if (!BerkeleyDatabaseSanityCheck()) {
+         return InitError(Untranslated("A version conflict was detected between the run-time BerkeleyDB library and the one used during compilation."));
+     }
+#endif
     if (gArgs.GetBoolArg("-disablewallet", DEFAULT_DISABLE_WALLET)) {
         for (const std::string& wallet : gArgs.GetArgs("-wallet")) {
             LogPrintf("%s: parameter interaction: -disablewallet -> ignoring -wallet=%s\n", __func__, wallet);