2.5-18.1

1 files changed, 836 insertions, 11 deletions

diff --git a/debug/tst-chk1.c b/debug/tst-chk1.c
index 0df660d..c450744 100644
--- a/debug/tst-chk1.c
+++ b/debug/tst-chk1.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
 
@@ -17,7 +17,12 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+/* Hack: make sure GCC doesn't know __chk_fail () will not return.  */
+#define __noreturn__
+
+#include <assert.h>
 #include <fcntl.h>
+#include <locale.h>
 #include <paths.h>
 #include <setjmp.h>
 #include <signal.h>
@@ -25,6 +30,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <wchar.h>
+#include <sys/socket.h>
+#include <sys/un.h>
 
 char *temp_filename;
 static void do_prepare (void);
@@ -69,13 +77,20 @@ handler (int sig)
 }
 
 char buf[10];
+wchar_t wbuf[10];
 volatile size_t l0;
 volatile char *p;
+volatile wchar_t *wp;
 const char *str1 = "JIHGFEDCBA";
 const char *str2 = "F";
 const char *str3 = "%s%n%s%n";
 const char *str4 = "Hello, ";
 const char *str5 = "World!\n";
+const wchar_t *wstr1 = L"JIHGFEDCBA";
+const wchar_t *wstr2 = L"F";
+const wchar_t *wstr3 = L"%s%n%s%n";
+const wchar_t *wstr4 = L"Hello, ";
+const wchar_t *wstr5 = L"World!\n";
 char buf2[10] = "%s";
 int num1 = 67;
 int num2 = 987654;
@@ -120,6 +135,7 @@ do_test (void)
   setenv ("LIBC_FATAL_STDERR_", "1", 1);
 
   struct A { char buf1[9]; char buf2[1]; } a;
+  struct wA { wchar_t buf1[9]; wchar_t buf2[1]; } wa;
 
   printf ("Test checking routines at fortify level %d\n",
 #ifdef __USE_FORTIFY_LEVEL
@@ -135,7 +151,8 @@ do_test (void)
   if (memcmp (buf, "aabcdefghi", 10))
     FAIL ();
 
-  if (mempcpy (buf + 5, "abcde", 5) != buf + 10 || memcmp (buf, "aabcdabcde", 10))
+  if (mempcpy (buf + 5, "abcde", 5) != buf + 10
+      || memcmp (buf, "aabcdabcde", 10))
     FAIL ();
 
   memset (buf + 8, 'j', 2);
@@ -166,7 +183,8 @@ do_test (void)
   if (memcmp (buf, "aabcdefghi", 10))
     FAIL ();
 
-  if (mempcpy (buf + 5, "abcde", l0 + 5) != buf + 10 || memcmp (buf, "aabcdabcde", 10))
+  if (mempcpy (buf + 5, "abcde", l0 + 5) != buf + 10
+      || memcmp (buf, "aabcdabcde", 10))
     FAIL ();
 
   memset (buf + 8, 'j', l0 + 2);
@@ -184,20 +202,24 @@ do_test (void)
   if (memcmp (buf, "aabcEDX\0\0", 10))
     FAIL ();
 
-  if (sprintf (buf + 7, "%d", num1) != 2 || memcmp (buf, "aabcEDX67", 10))
+  if (stpncpy (buf + 5, "cd", l0 + 5) != buf + 7
+      || memcmp (buf, "aabcEcd\0\0", 10))
+    FAIL ();
+
+  if (sprintf (buf + 7, "%d", num1) != 2 || memcmp (buf, "aabcEcd67", 10))
     FAIL ();
 
-  if (snprintf (buf + 7, 3, "%d", num2) != 6 || memcmp (buf, "aabcEDX98", 10))
+  if (snprintf (buf + 7, 3, "%d", num2) != 6 || memcmp (buf, "aabcEcd98", 10))
     FAIL ();
 
   buf[l0 + 8] = '\0';
   strcat (buf, "A");
-  if (memcmp (buf, "aabcEDX9A", 10))
+  if (memcmp (buf, "aabcEcd9A", 10))
     FAIL ();
 
   buf[l0 + 7] = '\0';
   strncat (buf, "ZYXWV", l0 + 2);
-  if (memcmp (buf, "aabcEDXZY", 10))
+  if (memcmp (buf, "aabcEcdZY", 10))
     FAIL ();
 
   memcpy (a.buf1, "abcdefghij", l0 + 10);
@@ -213,7 +235,7 @@ do_test (void)
   if (memcmp (a.buf1, "aabcdabcjj", 10))
     FAIL ();
 
-#if __USE_FORTIFY_LEVEL < 2
+#if __USE_FORTIFY_LEVEL < 2 || !__GNUC_PREREQ (4, 0)
   /* The following tests are supposed to crash with -D_FORTIFY_SOURCE=2
      and sufficient GCC support, as the string operations overflow
      from a.buf1 into a.buf2.  */
@@ -221,14 +243,16 @@ do_test (void)
   if (memcmp (a.buf1, "aabcEDCBA", 10))
     FAIL ();
 
-  if (stpcpy (a.buf1 + 8, str2) != a.buf1 + 9 || memcmp (a.buf1, "aabcEDCBF", 10))
+  if (stpcpy (a.buf1 + 8, str2) != a.buf1 + 9
+      || memcmp (a.buf1, "aabcEDCBF", 10))
     FAIL ();
 
   strncpy (a.buf1 + 6, "X", l0 + 4);
   if (memcmp (a.buf1, "aabcEDX\0\0", 10))
     FAIL ();
 
-  if (sprintf (a.buf1 + 7, "%d", num1) != 2 || memcmp (a.buf1, "aabcEDX67", 10))
+  if (sprintf (a.buf1 + 7, "%d", num1) != 2
+      || memcmp (a.buf1, "aabcEDX67", 10))
     FAIL ();
 
   if (snprintf (a.buf1 + 7, 3, "%d", num2) != 6
@@ -279,6 +303,10 @@ do_test (void)
   CHK_FAIL_END
 
   CHK_FAIL_START
+  stpncpy (buf + 6, "cd", l0 + 5);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
   sprintf (buf + 8, "%d", num1);
   CHK_FAIL_END
 
@@ -312,7 +340,7 @@ do_test (void)
   memset (a.buf1 + 9, 'j', l0 + 2);
   CHK_FAIL_END
 
-#if __USE_FORTIFY_LEVEL >= 2
+#if __USE_FORTIFY_LEVEL >= 2 && __GNUC_PREREQ (4, 0)
 # define O 0
 #else
 # define O 1
@@ -349,6 +377,219 @@ do_test (void)
   CHK_FAIL_END
 #endif
 
+
+  /* These ops can be done without runtime checking of object size.  */
+  wmemcpy (wbuf, L"abcdefghij", 10);
+  wmemmove (wbuf + 1, wbuf, 9);
+  if (wmemcmp (wbuf, L"aabcdefghi", 10))
+    FAIL ();
+
+  if (wmempcpy (wbuf + 5, L"abcde", 5) != wbuf + 10
+      || wmemcmp (wbuf, L"aabcdabcde", 10))
+    FAIL ();
+
+  wmemset (wbuf + 8, L'j', 2);
+  if (wmemcmp (wbuf, L"aabcdabcjj", 10))
+    FAIL ();
+
+  wcscpy (wbuf + 4, L"EDCBA");
+  if (wmemcmp (wbuf, L"aabcEDCBA", 10))
+    FAIL ();
+
+  if (wcpcpy (wbuf + 8, L"F") != wbuf + 9 || wmemcmp (wbuf, L"aabcEDCBF", 10))
+    FAIL ();
+
+  wcsncpy (wbuf + 6, L"X", 4);
+  if (wmemcmp (wbuf, L"aabcEDX\0\0", 10))
+    FAIL ();
+
+  if (swprintf (wbuf + 7, 3, L"%ls", L"987654") >= 0
+      || wmemcmp (wbuf, L"aabcEDX98", 10))
+    FAIL ();
+
+  if (swprintf (wbuf + 7, 3, L"64") != 2
+      || wmemcmp (wbuf, L"aabcEDX64", 10))
+    FAIL ();
+
+  /* These ops need runtime checking, but shouldn't __chk_fail.  */
+  wmemcpy (wbuf, L"abcdefghij", l0 + 10);
+  wmemmove (wbuf + 1, wbuf, l0 + 9);
+  if (wmemcmp (wbuf, L"aabcdefghi", 10))
+    FAIL ();
+
+  if (wmempcpy (wbuf + 5, L"abcde", l0 + 5) != wbuf + 10
+      || wmemcmp (wbuf, L"aabcdabcde", 10))
+    FAIL ();
+
+  wmemset (wbuf + 8, L'j', l0 + 2);
+  if (wmemcmp (wbuf, L"aabcdabcjj", 10))
+    FAIL ();
+
+  wcscpy (wbuf + 4, wstr1 + 5);
+  if (wmemcmp (wbuf, L"aabcEDCBA", 10))
+    FAIL ();
+
+  if (wcpcpy (wbuf + 8, wstr2) != wbuf + 9 || wmemcmp (wbuf, L"aabcEDCBF", 10))
+    FAIL ();
+
+  wcsncpy (wbuf + 6, L"X", l0 + 4);
+  if (wmemcmp (wbuf, L"aabcEDX\0\0", 10))
+    FAIL ();
+
+  if (wcpncpy (wbuf + 5, L"cd", l0 + 5) != wbuf + 7
+      || wmemcmp (wbuf, L"aabcEcd\0\0", 10))
+    FAIL ();
+
+  if (swprintf (wbuf + 7, 3, L"%d", num2) >= 0
+      || wmemcmp (wbuf, L"aabcEcd98", 10))
+    FAIL ();
+
+  wbuf[l0 + 8] = L'\0';
+  wcscat (wbuf, L"A");
+  if (wmemcmp (wbuf, L"aabcEcd9A", 10))
+    FAIL ();
+
+  wbuf[l0 + 7] = L'\0';
+  wcsncat (wbuf, L"ZYXWV", l0 + 2);
+  if (wmemcmp (wbuf, L"aabcEcdZY", 10))
+    FAIL ();
+
+  wmemcpy (wa.buf1, L"abcdefghij", l0 + 10);
+  wmemmove (wa.buf1 + 1, wa.buf1, l0 + 9);
+  if (wmemcmp (wa.buf1, L"aabcdefghi", 10))
+    FAIL ();
+
+  if (wmempcpy (wa.buf1 + 5, L"abcde", l0 + 5) != wa.buf1 + 10
+      || wmemcmp (wa.buf1, L"aabcdabcde", 10))
+    FAIL ();
+
+  wmemset (wa.buf1 + 8, L'j', l0 + 2);
+  if (wmemcmp (wa.buf1, L"aabcdabcjj", 10))
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL < 2
+  /* The following tests are supposed to crash with -D_FORTIFY_SOURCE=2
+     and sufficient GCC support, as the string operations overflow
+     from a.buf1 into a.buf2.  */
+  wcscpy (wa.buf1 + 4, wstr1 + 5);
+  if (wmemcmp (wa.buf1, L"aabcEDCBA", 10))
+    FAIL ();
+
+  if (wcpcpy (wa.buf1 + 8, wstr2) != wa.buf1 + 9
+      || wmemcmp (wa.buf1, L"aabcEDCBF", 10))
+    FAIL ();
+
+  wcsncpy (wa.buf1 + 6, L"X", l0 + 4);
+  if (wmemcmp (wa.buf1, L"aabcEDX\0\0", 10))
+    FAIL ();
+
+  if (swprintf (wa.buf1 + 7, 3, L"%d", num2) >= 0
+      || wmemcmp (wa.buf1, L"aabcEDX98", 10))
+    FAIL ();
+
+  wa.buf1[l0 + 8] = L'\0';
+  wcscat (wa.buf1, L"A");
+  if (wmemcmp (wa.buf1, L"aabcEDX9A", 10))
+    FAIL ();
+
+  wa.buf1[l0 + 7] = L'\0';
+  wcsncat (wa.buf1, L"ZYXWV", l0 + 2);
+  if (wmemcmp (wa.buf1, L"aabcEDXZY", 10))
+    FAIL ();
+
+#endif
+
+#if __USE_FORTIFY_LEVEL >= 1
+  /* Now check if all buffer overflows are caught at runtime.  */
+
+  CHK_FAIL_START
+  wmemcpy (wbuf + 1, L"abcdefghij", l0 + 10);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wmemmove (wbuf + 2, wbuf + 1, l0 + 9);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+    wp = wmempcpy (wbuf + 6, L"abcde", l0 + 5);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wmemset (wbuf + 9, L'j', l0 + 2);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wcscpy (wbuf + 5, wstr1 + 5);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wp = wcpcpy (wbuf + 9, wstr2);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wcsncpy (wbuf + 7, L"X", l0 + 4);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wcpncpy (wbuf + 6, L"cd", l0 + 5);
+  CHK_FAIL_END
+
+  wmemcpy (wbuf, wstr1 + 2, l0 + 9);
+  CHK_FAIL_START
+  wcscat (wbuf, L"AB");
+  CHK_FAIL_END
+
+  wmemcpy (wbuf, wstr1 + 3, l0 + 8);
+  CHK_FAIL_START
+  wcsncat (wbuf, L"ZYXWV", l0 + 3);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wmemcpy (wa.buf1 + 1, L"abcdefghij", l0 + 10);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wmemmove (wa.buf1 + 2, wa.buf1 + 1, l0 + 9);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wp = wmempcpy (wa.buf1 + 6, L"abcde", l0 + 5);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wmemset (wa.buf1 + 9, L'j', l0 + 2);
+  CHK_FAIL_END
+
+#if __USE_FORTIFY_LEVEL >= 2
+# define O 0
+#else
+# define O 1
+#endif
+
+  CHK_FAIL_START
+  wcscpy (wa.buf1 + (O + 4), wstr1 + 5);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wp = wcpcpy (wa.buf1 + (O + 8), wstr2);
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  wcsncpy (wa.buf1 + (O + 6), L"X", l0 + 4);
+  CHK_FAIL_END
+
+  wmemcpy (wa.buf1, wstr1 + (3 - O), l0 + 8 + O);
+  CHK_FAIL_START
+  wcscat (wa.buf1, L"AB");
+  CHK_FAIL_END
+
+  wmemcpy (wa.buf1, wstr1 + (4 - O), l0 + 7 + O);
+  CHK_FAIL_START
+  wcsncat (wa.buf1, L"ZYXWV", l0 + 3);
+  CHK_FAIL_END
+#endif
+
+
   /* Now checks for %n protection.  */
 
   /* Constant literals passed directly are always ok
@@ -455,6 +696,121 @@ do_test (void)
   CHK_FAIL_END
 #endif
 
+  rewind (stdin);
+
+  if (fgets (buf, sizeof (buf), stdin) != buf
+      || memcmp (buf, "abcdefgh\n", 10))
+    FAIL ();
+  if (fgets (buf, sizeof (buf), stdin) != buf || memcmp (buf, "ABCDEFGHI", 10))
+    FAIL ();
+
+  rewind (stdin);
+
+  if (fgets (buf, l0 + sizeof (buf), stdin) != buf
+      || memcmp (buf, "abcdefgh\n", 10))
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  if (fgets (buf, sizeof (buf) + 1, stdin) != buf)
+    FAIL ();
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  if (fgets (buf, l0 + sizeof (buf) + 1, stdin) != buf)
+    FAIL ();
+  CHK_FAIL_END
+#endif
+
+  rewind (stdin);
+
+  if (fgets_unlocked (buf, sizeof (buf), stdin) != buf
+      || memcmp (buf, "abcdefgh\n", 10))
+    FAIL ();
+  if (fgets_unlocked (buf, sizeof (buf), stdin) != buf
+      || memcmp (buf, "ABCDEFGHI", 10))
+    FAIL ();
+
+  rewind (stdin);
+
+  if (fgets_unlocked (buf, l0 + sizeof (buf), stdin) != buf
+      || memcmp (buf, "abcdefgh\n", 10))
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  if (fgets_unlocked (buf, sizeof (buf) + 1, stdin) != buf)
+    FAIL ();
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  if (fgets_unlocked (buf, l0 + sizeof (buf) + 1, stdin) != buf)
+    FAIL ();
+  CHK_FAIL_END
+#endif
+
+  lseek (fileno (stdin), 0, SEEK_SET);
+
+  if (read (fileno (stdin), buf, sizeof (buf) - 1) != sizeof (buf) - 1
+      || memcmp (buf, "abcdefgh\n", 9))
+    FAIL ();
+  if (read (fileno (stdin), buf, sizeof (buf) - 1) != sizeof (buf) - 1
+      || memcmp (buf, "ABCDEFGHI", 9))
+    FAIL ();
+
+  lseek (fileno (stdin), 0, SEEK_SET);
+
+  if (read (fileno (stdin), buf, l0 + sizeof (buf) - 1) != sizeof (buf) - 1
+      || memcmp (buf, "abcdefgh\n", 9))
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  if (read (fileno (stdin), buf, sizeof (buf) + 1) != sizeof (buf) + 1)
+    FAIL ();
+  CHK_FAIL_END
+#endif
+
+  if (pread (fileno (stdin), buf, sizeof (buf) - 1, sizeof (buf) - 2)
+      != sizeof (buf) - 1
+      || memcmp (buf, "\nABCDEFGH", 9))
+    FAIL ();
+  if (pread (fileno (stdin), buf, sizeof (buf) - 1, 0) != sizeof (buf) - 1
+      || memcmp (buf, "abcdefgh\n", 9))
+    FAIL ();
+  if (pread (fileno (stdin), buf, l0 + sizeof (buf) - 1, sizeof (buf) - 3)
+      != sizeof (buf) - 1
+      || memcmp (buf, "h\nABCDEFG", 9))
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  if (pread (fileno (stdin), buf, sizeof (buf) + 1, 2 * sizeof (buf))
+      != sizeof (buf) + 1)
+    FAIL ();
+  CHK_FAIL_END
+#endif
+
+  if (pread64 (fileno (stdin), buf, sizeof (buf) - 1, sizeof (buf) - 2)
+      != sizeof (buf) - 1
+      || memcmp (buf, "\nABCDEFGH", 9))
+    FAIL ();
+  if (pread64 (fileno (stdin), buf, sizeof (buf) - 1, 0) != sizeof (buf) - 1
+      || memcmp (buf, "abcdefgh\n", 9))
+    FAIL ();
+  if (pread64 (fileno (stdin), buf, l0 + sizeof (buf) - 1, sizeof (buf) - 3)
+      != sizeof (buf) - 1
+      || memcmp (buf, "h\nABCDEFG", 9))
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  if (pread64 (fileno (stdin), buf, sizeof (buf) + 1, 2 * sizeof (buf))
+      != sizeof (buf) + 1)
+    FAIL ();
+  CHK_FAIL_END
+#endif
+
   if (freopen (temp_filename, "r", stdin) == NULL)
     {
       puts ("could not open temporary file");
@@ -491,5 +847,474 @@ do_test (void)
   snprintf (buf, sizeof (buf), "%3$d\n", 1, 2, 3, 4);
   CHK_FAIL2_END
 
+  int sp[2];
+  if (socketpair (PF_UNIX, SOCK_STREAM, 0, sp))
+    FAIL ();
+  else
+    {
+      const char *sendstr = "abcdefgh\nABCDEFGH\n0123456789\n";
+      if (send (sp[0], sendstr, strlen (sendstr), 0) != strlen (sendstr))
+	FAIL ();
+
+      char recvbuf[12];
+      if (recv (sp[1], recvbuf, sizeof recvbuf, MSG_PEEK)
+	  != sizeof recvbuf
+	  || memcmp (recvbuf, sendstr, sizeof recvbuf) != 0)
+	FAIL ();
+
+      if (recv (sp[1], recvbuf + 6, l0 + sizeof recvbuf - 7, MSG_PEEK)
+	  != sizeof recvbuf - 7
+	  || memcmp (recvbuf + 6, sendstr, sizeof recvbuf - 7) != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      if (recv (sp[1], recvbuf + 1, sizeof recvbuf, MSG_PEEK)
+	  != sizeof recvbuf)
+	FAIL ();
+      CHK_FAIL_END
+
+      CHK_FAIL_START
+      if (recv (sp[1], recvbuf + 4, l0 + sizeof recvbuf - 3, MSG_PEEK)
+	  != sizeof recvbuf - 3)
+	FAIL ();
+      CHK_FAIL_END
+#endif
+
+      socklen_t sl;
+      struct sockaddr_un sa_un;
+
+      sl = sizeof (sa_un);
+      if (recvfrom (sp[1], recvbuf, sizeof recvbuf, MSG_PEEK, &sa_un, &sl)
+	  != sizeof recvbuf
+	  || memcmp (recvbuf, sendstr, sizeof recvbuf) != 0)
+	FAIL ();
+
+      sl = sizeof (sa_un);
+      if (recvfrom (sp[1], recvbuf + 6, l0 + sizeof recvbuf - 7, MSG_PEEK,
+	  &sa_un, &sl) != sizeof recvbuf - 7
+	  || memcmp (recvbuf + 6, sendstr, sizeof recvbuf - 7) != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      sl = sizeof (sa_un);
+      if (recvfrom (sp[1], recvbuf + 1, sizeof recvbuf, MSG_PEEK, &sa_un, &sl)
+	  != sizeof recvbuf)
+	FAIL ();
+      CHK_FAIL_END
+
+      CHK_FAIL_START
+      sl = sizeof (sa_un);
+      if (recvfrom (sp[1], recvbuf + 4, l0 + sizeof recvbuf - 3, MSG_PEEK,
+	  &sa_un, &sl) != sizeof recvbuf - 3)
+	FAIL ();
+      CHK_FAIL_END
+#endif
+
+      close (sp[0]);
+      close (sp[1]);
+    }
+
+  char fname[] = "/tmp/tst-chk1-dir-XXXXXX\0foo";
+  char *enddir = strchr (fname, '\0');
+  if (mkdtemp (fname) == NULL)
+    {
+      printf ("mkdtemp failed: %m\n");
+      return 1;
+    }
+  *enddir = '/';
+  if (symlink ("bar", fname) != 0)
+    FAIL ();
+
+  char readlinkbuf[4];
+  if (readlink (fname, readlinkbuf, 4) != 3
+      || memcmp (readlinkbuf, "bar", 3) != 0)
+    FAIL ();
+  if (readlink (fname, readlinkbuf + 1, l0 + 3) != 3
+      || memcmp (readlinkbuf, "bbar", 4) != 0)
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  if (readlink (fname, readlinkbuf + 2, l0 + 3) != 3)
+    FAIL ();
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  if (readlink (fname, readlinkbuf + 3, 4) != 3)
+    FAIL ();
+  CHK_FAIL_END
+#endif
+
+  int tmpfd = open ("/tmp", O_RDONLY | O_DIRECTORY);
+  if (tmpfd < 0)
+    FAIL ();
+
+  if (readlinkat (tmpfd, fname + sizeof ("/tmp/") - 1, readlinkbuf, 4) != 3
+      || memcmp (readlinkbuf, "bar", 3) != 0)
+    FAIL ();
+  if (readlinkat (tmpfd, fname + sizeof ("/tmp/") - 1, readlinkbuf + 1,
+		  l0 + 3) != 3
+      || memcmp (readlinkbuf, "bbar", 4) != 0)
+    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  if (readlinkat (tmpfd, fname + sizeof ("/tmp/") - 1, readlinkbuf + 2,
+		  l0 + 3) != 3)
+    FAIL ();
+  CHK_FAIL_END
+
+  CHK_FAIL_START
+  if (readlinkat (tmpfd, fname + sizeof ("/tmp/") - 1, readlinkbuf + 3,
+		  4) != 3)
+    FAIL ();
+  CHK_FAIL_END
+#endif
+
+  close (tmpfd);
+
+  char *cwd1 = getcwd (NULL, 0);
+  if (cwd1 == NULL)
+    FAIL ();
+
+  char *cwd2 = getcwd (NULL, 250);
+  if (cwd2 == NULL)
+    FAIL ();
+
+  if (cwd1 && cwd2)
+    {
+      if (strcmp (cwd1, cwd2) != 0)
+	FAIL ();
+
+      *enddir = '\0';
+      if (chdir (fname))
+	FAIL ();
+
+      char *cwd3 = getcwd (NULL, 0);
+      if (cwd3 == NULL)
+	FAIL ();
+      if (strcmp (fname, cwd3) != 0)
+	printf ("getcwd after chdir is '%s' != '%s',"
+		"get{c,}wd tests skipped\n", cwd3, fname);
+      else
+	{
+	  char getcwdbuf[sizeof fname - 3];
+
+	  char *cwd4 = getcwd (getcwdbuf, sizeof getcwdbuf);
+	  if (cwd4 != getcwdbuf
+	      || strcmp (getcwdbuf, fname) != 0)
+	    FAIL ();
+
+	  cwd4 = getcwd (getcwdbuf + 1, l0 + sizeof getcwdbuf - 1);
+	  if (cwd4 != getcwdbuf + 1
+	      || getcwdbuf[0] != fname[0]
+	      || strcmp (getcwdbuf + 1, fname) != 0)
+	    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+	  CHK_FAIL_START
+	  if (getcwd (getcwdbuf + 2, l0 + sizeof getcwdbuf)
+	      != getcwdbuf + 2)
+	    FAIL ();
+	  CHK_FAIL_END
+
+	  CHK_FAIL_START
+	  if (getcwd (getcwdbuf + 2, sizeof getcwdbuf)
+	      != getcwdbuf + 2)
+	    FAIL ();
+	  CHK_FAIL_END
+#endif
+
+	  if (getwd (getcwdbuf) != getcwdbuf
+	      || strcmp (getcwdbuf, fname) != 0)
+	    FAIL ();
+
+	  if (getwd (getcwdbuf + 1) != getcwdbuf + 1
+	      || strcmp (getcwdbuf + 1, fname) != 0)
+	    FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+	  CHK_FAIL_START
+	  if (getwd (getcwdbuf + 2) != getcwdbuf + 2)
+	    FAIL ();
+	  CHK_FAIL_END
+#endif
+	}
+
+      if (chdir (cwd1) != 0)
+	FAIL ();
+      free (cwd3);
+    }
+
+  free (cwd1);
+  free (cwd2);
+  *enddir = '/';
+  if (unlink (fname) != 0)
+    FAIL ();
+
+  *enddir = '\0';
+  if (rmdir (fname) != 0)
+    FAIL ();
+
+
+#if PATH_MAX > 0
+  char largebuf[PATH_MAX];
+  char *realres = realpath (".", largebuf);
+  if (realres != largebuf)
+    FAIL ();
+
+# if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  char realbuf[1];
+  realres = realpath (".", realbuf);
+  if (realres != realbuf)
+    FAIL ();
+  CHK_FAIL_END
+# endif
+#endif
+
+  if (setlocale (LC_ALL, "de_DE.UTF-8") != NULL)
+    {
+      assert (MB_CUR_MAX <= 10);
+
+      /* First a simple test.  */
+      char enough[10];
+      if (wctomb (enough, L'A') != 1)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      /* We know the wchar_t encoding is ISO 10646.  So pick a
+	 character which has a multibyte representation which does not
+	 fit.  */
+      CHK_FAIL_START
+      char smallbuf[2];
+      if (wctomb (smallbuf, L'\x100') != 2)
+	FAIL ();
+      CHK_FAIL_END
+#endif
+
+      mbstate_t s;
+      memset (&s, '\0', sizeof (s));
+      if (wcrtomb (enough, L'D', &s) != 1 || enough[0] != 'D')
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      /* We know the wchar_t encoding is ISO 10646.  So pick a
+	 character which has a multibyte representation which does not
+	 fit.  */
+      CHK_FAIL_START
+      char smallbuf[2];
+      if (wcrtomb (smallbuf, L'\x100', &s) != 2)
+	FAIL ();
+      CHK_FAIL_END
+#endif
+
+      wchar_t wenough[10];
+      memset (&s, '\0', sizeof (s));
+      const char *cp = "A";
+      if (mbsrtowcs (wenough, &cp, 10, &s) != 1
+	  || wcscmp (wenough, L"A") != 0)
+	FAIL ();
+
+      cp = "BC";
+      if (mbsrtowcs (wenough, &cp, l0 + 10, &s) != 2
+	  || wcscmp (wenough, L"BC") != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      wchar_t wsmallbuf[2];
+      cp = "ABC";
+      mbsrtowcs (wsmallbuf, &cp, 10, &s);
+      CHK_FAIL_END
+#endif
+
+      cp = "A";
+      if (mbstowcs (wenough, cp, 10) != 1
+	  || wcscmp (wenough, L"A") != 0)
+	FAIL ();
+
+      cp = "DEF";
+      if (mbstowcs (wenough, cp, l0 + 10) != 3
+	  || wcscmp (wenough, L"DEF") != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      wchar_t wsmallbuf[2];
+      cp = "ABC";
+      mbstowcs (wsmallbuf, cp, 10);
+      CHK_FAIL_END
+#endif
+
+      memset (&s, '\0', sizeof (s));
+      cp = "ABC";
+      wcscpy (wenough, L"DEF");
+      if (mbsnrtowcs (wenough, &cp, 1, 10, &s) != 1
+	  || wcscmp (wenough, L"AEF") != 0)
+	FAIL ();
+
+      cp = "IJ";
+      if (mbsnrtowcs (wenough, &cp, 1, l0 + 10, &s) != 1
+	  || wcscmp (wenough, L"IEF") != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      wchar_t wsmallbuf[2];
+      cp = "ABC";
+      mbsnrtowcs (wsmallbuf, &cp, 3, 10, &s);
+      CHK_FAIL_END
+#endif
+
+      memset (&s, '\0', sizeof (s));
+      const wchar_t *wcp = L"A";
+      if (wcsrtombs (enough, &wcp, 10, &s) != 1
+	  || strcmp (enough, "A") != 0)
+	FAIL ();
+
+      wcp = L"BC";
+      if (wcsrtombs (enough, &wcp, l0 + 10, &s) != 2
+	  || strcmp (enough, "BC") != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      char smallbuf[2];
+      wcp = L"ABC";
+      wcsrtombs (smallbuf, &wcp, 10, &s);
+      CHK_FAIL_END
+#endif
+
+      memset (enough, 'Z', sizeof (enough));
+      wcp = L"EF";
+      if (wcstombs (enough, wcp, 10) != 2
+	  || strcmp (enough, "EF") != 0)
+	FAIL ();
+
+      wcp = L"G";
+      if (wcstombs (enough, wcp, l0 + 10) != 1
+	  || strcmp (enough, "G") != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      char smallbuf[2];
+      wcp = L"ABC";
+      wcstombs (smallbuf, wcp, 10);
+      CHK_FAIL_END
+#endif
+
+      memset (&s, '\0', sizeof (s));
+      wcp = L"AB";
+      if (wcsnrtombs (enough, &wcp, 1, 10, &s) != 1
+	  || strcmp (enough, "A") != 0)
+	FAIL ();
+
+      wcp = L"BCD";
+      if (wcsnrtombs (enough, &wcp, 1, l0 + 10, &s) != 1
+	  || strcmp (enough, "B") != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      char smallbuf[2];
+      wcp = L"ABC";
+      wcsnrtombs (smallbuf, &wcp, 3, 10, &s);
+      CHK_FAIL_END
+#endif
+    }
+  else
+    {
+      puts ("cannot set locale");
+      ret = 1;
+    }
+
+  fd = posix_openpt (O_RDWR);
+  if (fd != -1)
+    {
+      char enough[1000];
+      if (ptsname_r (fd, enough, sizeof (enough)) != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      char smallbuf[2];
+      if (ptsname_r (fd, smallbuf, sizeof (smallbuf) + 1) == 0)
+	FAIL ();
+      CHK_FAIL_END
+#endif
+      close (fd);
+    }
+
+#if PATH_MAX > 0
+  confstr (_CS_GNU_LIBC_VERSION, largebuf, sizeof (largebuf));
+# if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  char smallbuf[1];
+  confstr (_CS_GNU_LIBC_VERSION, smallbuf, sizeof (largebuf));
+  CHK_FAIL_END
+# endif
+#endif
+
+  gid_t grpslarge[5];
+  int ngr = getgroups (5, grpslarge);
+  asm volatile ("" : : "r" (ngr));
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  char smallbuf[1];
+  ngr = getgroups (5, (gid_t *) smallbuf);
+  asm volatile ("" : : "r" (ngr));
+  CHK_FAIL_END
+#endif
+
+  fd = open (_PATH_TTY, O_RDONLY);
+  if (fd != -1)
+    {
+      char enough[1000];
+      if (ttyname_r (fd, enough, sizeof (enough)) != 0)
+	FAIL ();
+
+#if __USE_FORTIFY_LEVEL >= 1
+      CHK_FAIL_START
+      char smallbuf[2];
+      if (ttyname_r (fd, smallbuf, sizeof (smallbuf) + 1) == 0)
+	FAIL ();
+      CHK_FAIL_END
+#endif
+      close (fd);
+    }
+
+  char hostnamelarge[1000];
+  gethostname (hostnamelarge, sizeof (hostnamelarge));
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  char smallbuf[1];
+  gethostname (smallbuf, sizeof (hostnamelarge));
+  CHK_FAIL_END
+#endif
+
+  char loginlarge[1000];
+  getlogin_r (loginlarge, sizeof (hostnamelarge));
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  char smallbuf[1];
+  getlogin_r (smallbuf, sizeof (loginlarge));
+  CHK_FAIL_END
+#endif
+
+  char domainnamelarge[1000];
+  int res = getdomainname (domainnamelarge, sizeof (domainnamelarge));
+  asm volatile ("" : : "r" (res));
+#if __USE_FORTIFY_LEVEL >= 1
+  CHK_FAIL_START
+  char smallbuf[1];
+  res = getdomainname (smallbuf, sizeof (domainnamelarge));
+  asm volatile ("" : : "r" (res));
+  CHK_FAIL_END
+#endif
+
   return ret;
 }