Add test case for bug 18287

2 files changed, 237 insertions, 1 deletions

diff --git a/nss/Makefile b/nss/Makefile
index 65ab7b5..f6ef912 100644
--- a/nss/Makefile
+++ b/nss/Makefile
@@ -47,7 +47,8 @@ install-bin             := getent makedb
 makedb-modules = xmalloc hash-string
 extra-objs		+= $(makedb-modules:=.o)
 
-tests			= test-netdb tst-nss-test1 test-digits-dots tst-nss-getpwent
+tests			= test-netdb tst-nss-test1 test-digits-dots \
+			  tst-nss-getpwent bug18287
 xtests			= bug-erange
 
 # Specify rules for the nss_* modules.  We have some services.
diff --git a/nss/bug18287.c b/nss/bug18287.c
new file mode 100644
index 0000000..57abab0
--- /dev/null
+++ b/nss/bug18287.c
@@ -0,0 +1,235 @@
+/* Copyright (C) 2015 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pwd.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Check if two passwd structs contain the same data.  */
+static bool
+equal (const struct passwd *a, const struct passwd *b)
+{
+  return strcmp (a->pw_name, b->pw_name) == 0
+    && strcmp (a->pw_passwd, b->pw_passwd) == 0
+    && a->pw_uid == b->pw_uid
+    && a->pw_gid == b->pw_gid
+    && strcmp (a->pw_gecos, b->pw_gecos) == 0
+    && strcmp (a->pw_dir, b->pw_dir) == 0
+    && strcmp (a->pw_shell, b->pw_shell) == 0;
+}
+
+enum { MAX_TEST_ITEMS = 10 };
+static struct passwd test_items[MAX_TEST_ITEMS];
+static int test_count;
+
+/* Initialize test_items and test_count above, with data from the
+   passwd database.  */
+static bool
+init_test_items (void)
+{
+  setpwent ();
+  do
+    {
+      struct passwd *pwd = getpwent ();
+      if (pwd == NULL)
+        break;
+      struct passwd *target = test_items + test_count;
+      target->pw_name = strdup (pwd->pw_name);
+      target->pw_passwd = strdup (pwd->pw_passwd);
+      target->pw_uid = pwd->pw_uid;
+      target->pw_gid = pwd->pw_gid;
+      target->pw_gecos = strdup (pwd->pw_gecos);
+      target->pw_dir = strdup (pwd->pw_dir);
+      target->pw_shell = strdup (pwd->pw_shell);
+    }
+  while (++test_count < MAX_TEST_ITEMS);
+  endpwent ();
+
+  /* Filter out those test items which cannot be looked up by name or
+     UID.  */
+  bool found = false;
+  for (int i = 0; i < test_count; ++i)
+    {
+      struct passwd *pwd1 = getpwnam (test_items[i].pw_name);
+      struct passwd *pwd2 = getpwuid (test_items[i].pw_uid);
+      if (pwd1 == NULL || !equal (pwd1, test_items + i)
+          || pwd2 == NULL || !equal (pwd2, test_items + i))
+        test_items[i].pw_name = NULL;
+      else
+        found = true;
+    }
+
+  if (!found)
+    puts ("error: no accounts found which can be looked up by name and UID.");
+  return found;
+}
+
+/* Set to true if an error is encountered.  */
+static bool errors;
+
+/* Return true if the padding has not been tampered with.  */
+static bool
+check_padding (char *buffer, size_t size, char pad)
+{
+  char *end = buffer + size;
+  while (buffer < end)
+    {
+      if (*buffer != pad)
+        return false;
+      ++buffer;
+    }
+  return true;
+}
+
+/* Test one buffer size and padding combination.  */
+static void
+test_one (const struct passwd *item, size_t buffer_size,
+           char pad, size_t padding_size)
+{
+  char *buffer = malloc (buffer_size + padding_size);
+  if (buffer == NULL)
+    {
+      puts ("error: malloc failure");
+      errors = true;
+      return;
+    }
+
+  struct passwd pwd;
+  struct passwd *result;
+  int ret;
+
+  /* Test getpwname_r.  */
+  memset (buffer, pad, buffer_size + padding_size);
+  pwd = (struct passwd) {};
+  ret = getpwnam_r (item->pw_name, &pwd, buffer, buffer_size, &result);
+  if (!check_padding (buffer + buffer_size, padding_size, pad))
+    {
+      printf ("error: padding change: "
+              "name \"%s\", buffer size %zu, padding size %zu, pad 0x%02x\n",
+              item->pw_name, buffer_size, padding_size, (unsigned char) pad);
+      errors = true;
+    }
+  if (ret == 0)
+    {
+      if (result == NULL)
+        {
+          printf ("error: no data: name \"%s\", buffer size %zu\n",
+                  item->pw_name, buffer_size);
+          errors = true;
+        }
+      else if (!equal (item, result))
+        {
+          printf ("error: lookup mismatch: name \"%s\", buffer size %zu\n",
+                  item->pw_name, buffer_size);
+          errors = true;
+        }
+    }
+  else if (ret != ERANGE)
+    {
+      errno = ret;
+      printf ("error: lookup failure for name \"%s\": %m (%d)\n",
+              item->pw_name, ret);
+      errors = true;
+    }
+
+  /* Test getpwuid_r.  */
+  memset (buffer, pad, buffer_size + padding_size);
+  pwd = (struct passwd) {};
+  ret = getpwuid_r (item->pw_uid, &pwd, buffer, buffer_size, &result);
+  if (!check_padding (buffer + buffer_size, padding_size, pad))
+    {
+      printf ("error: padding change: "
+              "UID %ld, buffer size %zu, padding size %zu, pad 0x%02x\n",
+              (long) item->pw_uid, buffer_size, padding_size,
+              (unsigned char) pad);
+      errors = true;
+    }
+  if (ret == 0)
+    {
+      if (result == NULL)
+        {
+          printf ("error: no data: UID %ld, buffer size %zu\n",
+                  (long) item->pw_uid, buffer_size);
+          errors = true;
+        }
+      else if (!equal (item, result))
+        {
+          printf ("error: lookup mismatch: UID %ld, buffer size %zu\n",
+                  (long) item->pw_uid, buffer_size);
+          errors = true;
+        }
+    }
+  else if (ret != ERANGE)
+    {
+      errno = ret;
+      printf ("error: lookup failure for UID \"%ld\": %m (%d)\n",
+              (long) item->pw_uid, ret);
+      errors = true;
+    }
+
+  free (buffer);
+}
+
+/* Test one buffer size with different paddings.  */
+static void
+test_buffer_size (size_t buffer_size)
+{
+  for (int i = 0; i < test_count; ++i)
+    for (size_t padding_size = 0; padding_size < 3; ++padding_size)
+      {
+        test_one (test_items + i, buffer_size, '\0', padding_size);
+        if (padding_size > 0)
+          {
+            test_one (test_items + i, buffer_size, ':', padding_size);
+            test_one (test_items + i, buffer_size, '\n', padding_size);
+            test_one (test_items + i, buffer_size, '\xff', padding_size);
+            test_one (test_items + i, buffer_size, '@', padding_size);
+          }
+      }
+}
+
+int
+do_test (void)
+{
+  if (!init_test_items ())
+    return 1;
+  printf ("info: %d test items\n", test_count);
+
+  for (size_t buffer_size = 0; buffer_size <= 65; ++buffer_size)
+    test_buffer_size (buffer_size);
+  for (size_t buffer_size = 64 + 4; buffer_size < 256; buffer_size += 4)
+    test_buffer_size (buffer_size);
+  test_buffer_size (255);
+  test_buffer_size (257);
+  for (size_t buffer_size = 256; buffer_size < 512; buffer_size += 8)
+    test_buffer_size (buffer_size);
+  test_buffer_size (511);
+  test_buffer_size (513);
+  test_buffer_size (1024);
+  test_buffer_size (2048);
+
+  if (errors)
+    return 1;
+  else
+    return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"