1 files changed, 124 insertions, 0 deletions
diff --git a/elf/tst-audit22.c b/elf/tst-audit22.c
new file mode 100644
index 0000000000..18fd22a760
--- /dev/null
+++ b/elf/tst-audit22.c
@@ -0,0 +1,124 @@
+/* Check DTAUDIT and vDSO interaction.
+   Copyright (C) 2021 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; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdlib.h>
+#include <support/capture_subprocess.h>
+#include <support/check.h>
+#include <support/xstdio.h>
+#include <support/support.h>
+#include <sys/auxv.h>
+
+static int restart;
+#define CMDLINE_OPTIONS \
+  { "restart", no_argument, &restart, 1 },
+
+static uintptr_t vdso_addr;
+
+static int
+handle_restart (void)
+{
+  fprintf (stderr, "vdso: %p\n", (void*) vdso_addr);
+  return 0;
+}
+
+static uintptr_t
+parse_address (const char *str)
+{
+  void *r;
+  TEST_COMPARE (sscanf (str, "%p\n", &r), 1);
+  return (uintptr_t) r;
+}
+
+static inline bool
+startswith (const char *str, const char *pre)
+{
+  size_t lenpre = strlen (pre);
+  size_t lenstr = strlen (str);
+  return lenstr >= lenpre && memcmp (pre, str, lenpre) == 0;
+}
+
+static int
+do_test (int argc, char *argv[])
+{
+  vdso_addr = getauxval (AT_SYSINFO_EHDR);
+  if (vdso_addr == 0)
+    FAIL_UNSUPPORTED ("getauxval (AT_SYSINFO_EHDR) returned 0");
+
+  /* We must have either:
+     - One our fource parameters left if called initially:
+       + path to ld.so         optional
+       + "--library-path"      optional
+       + the library path      optional
+       + the application name  */
+  if (restart)
+    return handle_restart ();
+
+  char *spargv[9];
+  int i = 0;
+  for (; i < argc - 1; i++)
+    spargv[i] = argv[i + 1];
+  spargv[i++] = (char *) "--direct";
+  spargv[i++] = (char *) "--restart";
+  spargv[i] = NULL;
+
+  setenv ("LD_AUDIT", "tst-auditmod22.so", 0);
+  struct support_capture_subprocess result
+    = support_capture_subprogram (spargv[0], spargv);
+  support_capture_subprocess_check (&result, "tst-audit22", 0, sc_allow_stderr);
+
+  /* The respawned process should always print the vDSO address (otherwise it
+     will fails as unsupported).  However, on some architectures the audit
+     module might see the vDSO with l_addr being 0, meaning a fixed mapping
+     (linux-gate.so).  In this case we don't check its value against
+     AT_SYSINFO_EHDR one.  */
+  uintptr_t vdso_process = 0;
+  bool vdso_audit_found = false;
+  uintptr_t vdso_audit = 0;
+
+  FILE *out = fmemopen (result.err.buffer, result.err.length, "r");
+  TEST_VERIFY (out != NULL);
+  char *buffer = NULL;
+  size_t buffer_length = 0;
+  while (xgetline (&buffer, &buffer_length, out))
+    {
+      if (startswith (buffer, "vdso: "))
+	vdso_process = parse_address (buffer + strlen ("vdso: "));
+      else if (startswith (buffer, "vdso found: "))
+	{
+	  vdso_audit = parse_address (buffer + strlen ("vdso found: "));
+          vdso_audit_found = true;
+	}
+    }
+
+  TEST_COMPARE (vdso_audit_found, true);
+  if (vdso_audit != 0)
+    TEST_COMPARE (vdso_process, vdso_audit);
+
+  free (buffer);
+  xfclose (out);
+
+  return 0;
+}
+
+#define TEST_FUNCTION_ARGV do_test
+#include <support/test-driver.c>