* posix/bits/unistd.h (__readlinkat_chk): New prototype.

	(__readlinkat_alias): New alias.
	(readlinkat): New inline function.
	* include/unistd.h (readlinkat): Add libc_hidden_proto.
	* sysdeps/unix/sysv/linux/readlinkat.c (readlinkat): Add
	libc_hidden_def.
	* io/readlinkat.c (readlinkat): Likewise.
	* debug/readlinkat_chk.c: New file.
	* debug/Makefile (routines): Add readlinkat_chk.
	* debug/Versions (libc): Export __readlinkat_chk@@GLIBC_2.5.
	* debug/tst-chk1.c (do_test): Add readlinkat tests.

	* nis/nss_nisplus/nisplus-netgrp.c: Cleanups.
	code is possible.  Move compatibility code in .text.compat section.
	over gaih array.  There is only one function to call in the moment.

9 files changed, 107 insertions, 5 deletions

diff --git a/ChangeLog b/ChangeLog
index c4813a3..5439032 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,20 @@
+2006-04-24  Jakub Jelinek  <jakub@redhat.com>
+
+	* posix/bits/unistd.h (__readlinkat_chk): New prototype.
+	(__readlinkat_alias): New alias.
+	(readlinkat): New inline function.
+	* include/unistd.h (readlinkat): Add libc_hidden_proto.
+	* sysdeps/unix/sysv/linux/readlinkat.c (readlinkat): Add
+	libc_hidden_def.
+	* io/readlinkat.c (readlinkat): Likewise.
+	* debug/readlinkat_chk.c: New file.
+	* debug/Makefile (routines): Add readlinkat_chk.
+	* debug/Versions (libc): Export __readlinkat_chk@@GLIBC_2.5.
+	* debug/tst-chk1.c (do_test): Add readlinkat tests.
+
 2006-04-23  Ulrich Drepper  <drepper@redhat.com>
 
-	* nis/nss_nisplus/nisplus-netgrp.c: Cleanups.	
+	* nis/nss_nisplus/nisplus-netgrp.c: Cleanups.
 
 	[BZ #1951]
 	* sysdeps/posix/sigset.c (sigset): Return correct value reflecting
@@ -37,13 +51,13 @@
 	* sysdeps/unix/sysv/linux/kernel-features.h: Define
 	__ASSUME_PROC_SELF_FD_SYMLINK.
 	* sysdeps/unix/sysv/linux/ttyname.c: Cleanups.  Avoid compatibility
-	code if possible.  Move compatibility code in .text.compat section.
+	code is possible.  Move compatibility code in .text.compat section.
 	* sysdeps/unix/sysv/linux/ttyname_r.c: Likewise.
 
 2006-04-18  Ulrich Drepper  <drepper@redhat.com>
 
 	* sysdeps/posix/getaddrinfo.c (getaddrinfo): Rewrite to avoid loop
-	over gaih array.  There is only on function to call in the moment.
+	over gaih array.  There is only one function to call in the moment.
 
 2006-04-16  Ulrich Drepper  <drepper@redhat.com>
 
diff --git a/debug/Makefile b/debug/Makefile
index 9123bf6..4b4b541 100644
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -31,7 +31,8 @@ routines  = backtrace backtracesyms backtracesymsfd noophooks \
 	    printf_chk fprintf_chk vprintf_chk vfprintf_chk \
 	    gets_chk chk_fail readonly-area fgets_chk fgets_u_chk \
 	    read_chk pread_chk pread64_chk recv_chk recvfrom_chk \
-	    readlink_chk getwd_chk getcwd_chk realpath_chk ptsname_r_chk \
+	    readlink_chk readlinkat_chk getwd_chk getcwd_chk \
+	    realpath_chk ptsname_r_chk \
 	    wctomb_chk wcscpy_chk wmemcpy_chk wmemmove_chk wmempcpy_chk \
 	    wcpcpy_chk wcsncpy_chk wcscat_chk wcsncat_chk wmemset_chk \
 	    wcpncpy_chk \
diff --git a/debug/Versions b/debug/Versions
index 683eb17..5c87af2 100644
--- a/debug/Versions
+++ b/debug/Versions
@@ -36,4 +36,7 @@ libc {
 
     __stack_chk_fail;
   }
+  GLIBC_2.5 {
+    __readlinkat_chk;
+  }
 }
diff --git a/debug/readlinkat_chk.c b/debug/readlinkat_chk.c
new file mode 100644
index 0000000..eab99c0
--- /dev/null
+++ b/debug/readlinkat_chk.c
@@ -0,0 +1,31 @@
+/* Copyright (C) 2006 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <unistd.h>
+#include <sys/param.h>
+
+
+ssize_t
+__readlinkat_chk (int fd, const char *path, void *buf, size_t len,
+		  size_t buflen)
+{
+  if (len > buflen)
+    __chk_fail ();
+
+  return readlinkat (fd, path, buf, len);
+}
diff --git a/debug/tst-chk1.c b/debug/tst-chk1.c
index ee080ce..993dab6 100644
--- a/debug/tst-chk1.c
+++ b/debug/tst-chk1.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2004, 2005 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.
 
@@ -944,6 +944,34 @@ do_test (void)
   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 ();
diff --git a/include/unistd.h b/include/unistd.h
index 670cb32..f8f15ed 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -15,6 +15,7 @@ libc_hidden_proto (getlogin_r)
 libc_hidden_proto (seteuid)
 libc_hidden_proto (setegid)
 libc_hidden_proto (tcgetpgrp)
+libc_hidden_proto (readlinkat)
 
 /* Now define the internal interfaces.  */
 extern int __access (__const char *__name, int __type);
diff --git a/io/readlinkat.c b/io/readlinkat.c
index 483dc49..7e6a222 100644
--- a/io/readlinkat.c
+++ b/io/readlinkat.c
@@ -46,5 +46,6 @@ readlinkat (fd, path, buf, len)
   return -1;
 }
 stub_warning (readlinkat)
+libc_hidden_def (readlinkat)
 
 #include <stub-tag.h>
diff --git a/posix/bits/unistd.h b/posix/bits/unistd.h
index d461108..96f26d5 100644
--- a/posix/bits/unistd.h
+++ b/posix/bits/unistd.h
@@ -100,6 +100,28 @@ __NTH (readlink (__const char *__restrict __path, char *__restrict __buf,
 }
 #endif
 
+#ifdef __USE_ATFILE
+extern ssize_t __readlinkat_chk (int __fd, __const char *__restrict __path,
+				 char *__restrict __buf, size_t __len,
+				 size_t __buflen)
+     __THROW __nonnull ((2, 3)) __wur;
+extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
+			       (int __fd, __const char *__restrict __path,
+				char *__restrict __buf, size_t __len),
+			       readlinkat)
+     __nonnull ((2, 3)) __wur;
+
+extern __always_inline __nonnull ((2, 3)) __wur ssize_t
+__NTH (readlinkat (int __fd, __const char *__restrict __path,
+		   char *__restrict __buf, size_t __len))
+{
+  if (__bos (__buf) != (size_t) -1
+      && (!__builtin_constant_p (__len) || __len > __bos (__buf)))
+    return __readlinkat_chk (__fd, __path, __buf, __len, __bos (__buf));
+  return __readlinkat_alias (__fd, __path, __buf, __len);
+}
+#endif
+
 extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
      __THROW __wur;
 extern char *__REDIRECT_NTH (__getcwd_alias,
diff --git a/sysdeps/unix/sysv/linux/readlinkat.c b/sysdeps/unix/sysv/linux/readlinkat.c
index 9b4a730..1361596 100644
--- a/sysdeps/unix/sysv/linux/readlinkat.c
+++ b/sysdeps/unix/sysv/linux/readlinkat.c
@@ -87,3 +87,4 @@ readlinkat (fd, path, buf, len)
   return result;
 #endif
 }
+libc_hidden_def (readlinkat)