debug: Synchronize feature guards in fortified functions [BZ #28746]

Some functions (e.g. stpcpy, pread64, etc.) had moved to POSIX in the main headers as they got incorporated into the standard, but their fortified variants remained under __USE_GNU. As a result, these functions did not get fortified when _GNU_SOURCE was not defined. Add test wrappers that check all functions tested in tst-chk0 at all levels with _GNU_SOURCE undefined and then use the failures to (1) exclude checks for _GNU_SOURCE functions in these tests and (2) Fix feature macro guards in the fortified function headers so that they're the same as the ones in the main headers. This fixes BZ #28746. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> (cherry picked from commit fcfc908681)
2024-12-11 13:50:06 +00:00 · 2022-01-12 23:34:48 +05:30 · 2022-01-12 23:34:48 +05:30 · 224d8c1890
commit 224d8c1890
parent f8c2f620f1
6 changed files with 59 additions and 16 deletions
--- a/debug/Makefile
+++ b/debug/Makefile
@ -132,6 +132,12 @@ define cflags-lfs
 CFLAGS-tst-fortify-$(1)-lfs-$(2).$(1) += -D_FILE_OFFSET_BITS=64
 endef

+define cflags-nongnu
+CFLAGS-tst-fortify-$(1)-nongnu-$(2).$(1) += -D_LARGEFILE64_SOURCE=1
+endef
+
+src-chk-nongnu = \#undef _GNU_SOURCE
+
 # We know these tests have problems with format strings, this is what
 # we are testing.  Disable that warning.  They are also testing
 # deprecated functions (notably gets) so disable that warning as well.
@ -145,13 +151,13 @@ CFLAGS-tst-fortify-$(1)-$(2)-$(3).$(1) += -D_FORTIFY_SOURCE=$(3) -Wno-format \
 $(eval $(call cflags-$(2),$(1),$(3)))
 $(objpfx)tst-fortify-$(1)-$(2)-$(3).$(1): tst-fortify.c Makefile
 	( echo "/* Autogenerated from Makefile.  */"; \
-	  echo ""; \
+	  echo "$(src-chk-$(2))"; \
 	  echo "#include \"tst-fortify.c\"" ) > $$@.tmp
 	mv $$@.tmp $$@
 endef

 chk-extensions = c cc
-chk-types = default lfs
+chk-types = default lfs nongnu
 chk-levels = 1 2 3

 $(foreach e,$(chk-extensions), \
--- a/debug/tst-fortify.c
+++ b/debug/tst-fortify.c
@ -1,4 +1,5 @@
-/* Copyright (C) 2004-2021 Free Software Foundation, Inc.
+/* Copyright (C) 2004-2022 Free Software Foundation, Inc.
+   Copyright The GNU Toolchain Authors.
   This file is part of the GNU C Library.
   Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.

@ -37,6 +38,17 @@
 #include <sys/socket.h>
 #include <sys/un.h>

+#ifndef _GNU_SOURCE
+# define MEMPCPY memcpy
+# define WMEMPCPY wmemcpy
+# define MEMPCPY_RET(x) 0
+# define WMEMPCPY_RET(x) 0
+#else
+# define MEMPCPY mempcpy
+# define WMEMPCPY wmempcpy
+# define MEMPCPY_RET(x) __builtin_strlen (x)
+# define WMEMPCPY_RET(x) wcslen (x)
+#endif

 #define obstack_chunk_alloc malloc
 #define obstack_chunk_free free
@ -163,7 +175,7 @@ do_test (void)
  if (memcmp (buf, "aabcdefghi", 10))
    FAIL ();

-  if (mempcpy (buf + 5, "abcde", 5) != buf + 10
+  if (MEMPCPY (buf + 5, "abcde", 5) != buf + 5 + MEMPCPY_RET ("abcde")
      || memcmp (buf, "aabcdabcde", 10))
    FAIL ();

@ -208,7 +220,7 @@ do_test (void)
  if (memcmp (buf, "aabcdefghi", 10))
    FAIL ();

-  if (mempcpy (buf + 5, "abcde", l0 + 5) != buf + 10
+  if (MEMPCPY (buf + 5, "abcde", l0 + 5) != buf + 5 + MEMPCPY_RET ("abcde")
      || memcmp (buf, "aabcdabcde", 10))
    FAIL ();

@ -267,7 +279,8 @@ do_test (void)
  if (memcmp (a.buf1, "aabcdefghi", 10))
    FAIL ();

-  if (mempcpy (a.buf1 + 5, "abcde", l0 + 5) != a.buf1 + 10
+  if (MEMPCPY (a.buf1 + 5, "abcde", l0 + 5)
+      != a.buf1 + 5 + MEMPCPY_RET ("abcde")
      || memcmp (a.buf1, "aabcdabcde", 10))
    FAIL ();

@ -348,6 +361,7 @@ do_test (void)
  bcopy (buf + 1, buf + 2, l0 + 9);
  CHK_FAIL_END

+#ifdef _GNU_SOURCE
  CHK_FAIL_START
  p = (char *) mempcpy (buf + 6, "abcde", 5);
  CHK_FAIL_END
@ -355,6 +369,7 @@ do_test (void)
  CHK_FAIL_START
  p = (char *) mempcpy (buf + 6, "abcde", l0 + 5);
  CHK_FAIL_END
+#endif

  CHK_FAIL_START
  memset (buf + 9, 'j', 2);
@ -465,6 +480,7 @@ do_test (void)
  bcopy (a.buf1 + 1, a.buf1 + 2, l0 + 9);
  CHK_FAIL_END

+#ifdef _GNU_SOURCE
  CHK_FAIL_START
  p = (char *) mempcpy (a.buf1 + 6, "abcde", 5);
  CHK_FAIL_END
@ -472,6 +488,7 @@ do_test (void)
  CHK_FAIL_START
  p = (char *) mempcpy (a.buf1 + 6, "abcde", l0 + 5);
  CHK_FAIL_END
+#endif

  CHK_FAIL_START
  memset (a.buf1 + 9, 'j', 2);
@ -551,7 +568,7 @@ do_test (void)
  if (wmemcmp (wbuf, L"aabcdefghi", 10))
    FAIL ();

-  if (wmempcpy (wbuf + 5, L"abcde", 5) != wbuf + 10
+  if (WMEMPCPY (wbuf + 5, L"abcde", 5) != wbuf + 5 + WMEMPCPY_RET (L"abcde")
      || wmemcmp (wbuf, L"aabcdabcde", 10))
    FAIL ();

@ -584,7 +601,8 @@ do_test (void)
  if (wmemcmp (wbuf, L"aabcdefghi", 10))
    FAIL ();

-  if (wmempcpy (wbuf + 5, L"abcde", l0 + 5) != wbuf + 10
+  if (WMEMPCPY (wbuf + 5, L"abcde", l0 + 5)
+      != wbuf + 5 + WMEMPCPY_RET (L"abcde")
      || wmemcmp (wbuf, L"aabcdabcde", 10))
    FAIL ();

@ -626,7 +644,8 @@ do_test (void)
  if (wmemcmp (wa.buf1, L"aabcdefghi", 10))
    FAIL ();

-  if (wmempcpy (wa.buf1 + 5, L"abcde", l0 + 5) != wa.buf1 + 10
+  if (WMEMPCPY (wa.buf1 + 5, L"abcde", l0 + 5)
+      != wa.buf1 + 5 + WMEMPCPY_RET (L"abcde")
      || wmemcmp (wa.buf1, L"aabcdabcde", 10))
    FAIL ();

@ -695,6 +714,7 @@ do_test (void)
  wmemmove (wbuf + 2, wbuf + 1, l0 + 9);
  CHK_FAIL_END

+#ifdef _GNU_SOURCE
  CHK_FAIL_START
  wp = wmempcpy (wbuf + 6, L"abcde", 5);
  CHK_FAIL_END
@ -702,6 +722,7 @@ do_test (void)
  CHK_FAIL_START
  wp = wmempcpy (wbuf + 6, L"abcde", l0 + 5);
  CHK_FAIL_END
+#endif

  CHK_FAIL_START
  wmemset (wbuf + 9, L'j', 2);
@ -769,6 +790,7 @@ do_test (void)
  wmemmove (wa.buf1 + 2, wa.buf1 + 1, l0 + 9);
  CHK_FAIL_END

+#ifdef _GNU_SOURCE
  CHK_FAIL_START
  wp = wmempcpy (wa.buf1 + 6, L"abcde", 5);
  CHK_FAIL_END
@ -776,6 +798,7 @@ do_test (void)
  CHK_FAIL_START
  wp = wmempcpy (wa.buf1 + 6, L"abcde", l0 + 5);
  CHK_FAIL_END
+#endif

  CHK_FAIL_START
  wmemset (wa.buf1 + 9, L'j', 2);
@ -907,6 +930,7 @@ do_test (void)
  if (fprintf (fp, buf2 + 4, str5) != 7)
    FAIL ();

+#ifdef _GNU_SOURCE
  char *my_ptr = NULL;
  strcpy (buf2 + 2, "%n%s%n");
  /* When the format string is writable and contains %n,
@ -936,6 +960,7 @@ do_test (void)
  if (obstack_printf (&obs, "%s%n%s%n", str4, &n1, str5, &n1) != 14)
    FAIL ();
  obstack_free (&obs, NULL);
+#endif

  if (freopen (temp_filename, "r", stdin) == NULL)
    {
@ -983,6 +1008,7 @@ do_test (void)

  rewind (stdin);

+#ifdef _GNU_SOURCE
  if (fgets_unlocked (buf, buf_size, stdin) != buf
      || memcmp (buf, "abcdefgh\n", 10))
    FAIL ();
@ -1009,6 +1035,7 @@ do_test (void)
 #endif

  rewind (stdin);
+#endif

  if (fread (buf, 1, buf_size, stdin) != buf_size
      || memcmp (buf, "abcdefgh\nA", 10))
@ -1579,7 +1606,10 @@ do_test (void)
      ret = 1;
    }

-  int fd = posix_openpt (O_RDWR);
+  int fd;
+
+#ifdef _GNU_SOURCE
+  fd = posix_openpt (O_RDWR);
  if (fd != -1)
    {
      char enough[1000];
@ -1595,6 +1625,7 @@ do_test (void)
 #endif
      close (fd);
    }
+#endif

 #if PATH_MAX > 0
  confstr (_CS_GNU_LIBC_VERSION, largebuf, sizeof (largebuf));
@ -1712,8 +1743,9 @@ do_test (void)
  poll (fds, l0 + 2, 0);
  CHK_FAIL_END
 #endif
+#ifdef _GNU_SOURCE
  ppoll (fds, 1, NULL, NULL);
-#if __USE_FORTIFY_LEVEL >= 1
+# if __USE_FORTIFY_LEVEL >= 1
  CHK_FAIL_START
  ppoll (fds, 2, NULL, NULL);
  CHK_FAIL_END
@ -1721,6 +1753,7 @@ do_test (void)
  CHK_FAIL_START
  ppoll (fds, l0 + 2, NULL, NULL);
  CHK_FAIL_END
+# endif
 #endif

  return ret;
--- a/posix/bits/unistd.h
+++ b/posix/bits/unistd.h
@ -40,7 +40,7 @@ read (int __fd, void *__buf, size_t __nbytes)
 			  __fd, __buf, __nbytes);
 }

-#ifdef __USE_UNIX98
+#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
 extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
 			    __off_t __offset, size_t __bufsize)
  __wur __attr_access ((__write_only__, 2, 3));
--- a/string/bits/string_fortified.h
+++ b/string/bits/string_fortified.h
@ -79,7 +79,7 @@ __NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
  return __builtin___strcpy_chk (__dest, __src, __glibc_objsize (__dest));
 }

-#ifdef __USE_GNU
+#ifdef __USE_XOPEN2K8
 __fortify_function char *
 __NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
 {
@ -96,14 +96,15 @@ __NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
 				  __glibc_objsize (__dest));
 }

-#if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
+#ifdef __USE_XOPEN2K8
+# if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
 __fortify_function char *
 __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
 {
  return __builtin___stpncpy_chk (__dest, __src, __n,
 				  __glibc_objsize (__dest));
 }
-#else
+# else
 extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
 			    size_t __destlen) __THROW
  __fortified_attr_access ((__write_only__, 1, 3))
@ -119,6 +120,7 @@ __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
    return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
  return __stpncpy_alias (__dest, __src, __n);
 }
+# endif
 #endif


--- a/support/xsignal.h
+++ b/support/xsignal.h
@ -28,7 +28,9 @@ __BEGIN_DECLS
   terminate the process on error.  */

 void xraise (int sig);
+#ifdef _GNU_SOURCE
 sighandler_t xsignal (int sig, sighandler_t handler);
+#endif
 void xsigaction (int sig, const struct sigaction *newact,
                 struct sigaction *oldact);

--- a/wcsmbs/bits/wchar2.h
+++ b/wcsmbs/bits/wchar2.h
@ -457,7 +457,7 @@ __NTH (wcsrtombs (char *__restrict __dst, const wchar_t **__restrict __src,
 }


-#ifdef __USE_GNU
+#ifdef	__USE_XOPEN2K8
 extern size_t __mbsnrtowcs_chk (wchar_t *__restrict __dst,
 				const char **__restrict __src, size_t __nmc,
 				size_t __len, mbstate_t *__restrict __ps,