1 files changed, 56 insertions, 0 deletions
diff --git a/elf/tst-version-hash-zero.c b/elf/tst-version-hash-zero.c
new file mode 100644
index 0000000..66a0db4
--- /dev/null
+++ b/elf/tst-version-hash-zero.c
@@ -0,0 +1,56 @@
+/* Symbols with version hash zero should not match any version (bug 29190).
+   Copyright (C) 2025  Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <https://www.gnu.org/licenses/>.  */
+
+#include <support/check.h>
+#include <support/xdlfcn.h>
+#include <stddef.h>
+#include <string.h>
+
+static int
+do_test (void)
+{
+  void *handle = xdlopen ("tst-version-hash-zero-mod.so", RTLD_NOW);
+
+  /* This used to crash because some struct r_found_version entries
+     with hash zero did not have valid version strings.  */
+  TEST_VERIFY (xdlvsym (handle, "global_variable", "PPPPPPPPPPPP") != NULL);
+
+  /* Consistency check.  */
+  TEST_VERIFY (xdlsym (handle, "global_variable")
+               == xdlvsym (handle, "global_variable", "PPPPPPPPPPPP"));
+
+  /* This symbol version is supposed to be missing.  */
+  TEST_VERIFY (dlvsym (handle, "global_variable", "OTHER_VERSION") == NULL);
+
+  /* tst-version-hash-zero-refmod.so references
+     global_variable@@OTHER_VERSION and is expected to fail to load.
+     dlvsym sets the hidden flag during lookup.  Relocation does not,
+     so this exercises a different failure case.  */
+  TEST_VERIFY_EXIT (dlopen ("tst-version-hash-zero-refmod.so", RTLD_NOW)
+                    == NULL);
+  const char *message = dlerror ();
+  if (strstr (message,
+              ": undefined symbol: global_variable, version OTHER_VERSION")
+      == NULL)
+    FAIL_EXIT1 ("unexpected dlopen failure: %s", message);
+
+  xdlclose (handle);
+  return 0;
+}
+
+#include <support/test-driver.c>