Add checking versions of poll and ppoll

3 files changed, 86 insertions, 1 deletions

diff --git a/io/bits/poll2.h b/io/bits/poll2.h
new file mode 100644
index 0000000000..7a9dd8a30b
--- /dev/null
+++ b/io/bits/poll2.h
@@ -0,0 +1,78 @@
+/* Checking macros for poll functions.
+   Copyright (C) 2012 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.  */
+
+#ifndef _SYS_POLL_H
+# error "Never include <bits/poll2.h> directly; use <sys/poll.h> instead."
+#endif
+
+
+extern int __REDIRECT (__poll_alias, (struct pollfd *__fds, nfds_t __nfds,
+				      int __timeout), poll);
+extern int __poll_chk (struct pollfd *__fds, nfds_t __nfds, int __timeout,
+		       __SIZE_TYPE__ __fdslen);
+extern int __REDIRECT (__poll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
+					 int __timeout, __SIZE_TYPE__ __fdslen),
+		       __poll_chk)
+  __warnattr ("poll called with fds buffer too small file nfds entries");
+
+__extern_always_inline int
+poll (struct pollfd *__fds, nfds_t __nfds, int __timeout)
+{
+  if (__bos (__fds) != (__SIZE_TYPE__) -1)
+    {
+      if (! __builtin_constant_p (__nfds))
+	return __poll_chk (__fds, __nfds, __timeout, __bos (__fds));
+      else if (__bos (__fds) / sizeof (*__fds) < __nfds)
+	return __poll_chk_warn (__fds, __nfds, __timeout, __bos (__fds));
+    }
+
+  return __poll_alias (__fds, __nfds, __timeout);
+}
+
+
+#ifdef __USE_GNU
+extern int __REDIRECT (__ppoll_alias, (struct pollfd *__fds, nfds_t __nfds,
+				       const struct timespec *__timeout,
+				       const __sigset_t *__ss), ppoll);
+extern int __ppoll_chk (struct pollfd *__fds, nfds_t __nfds,
+			const struct timespec *__timeout,
+			const __sigset_t *__ss, __SIZE_TYPE__ __fdslen);
+extern int __REDIRECT (__ppoll_chk_warn, (struct pollfd *__fds, nfds_t __nfds,
+					  const struct timespec *__timeout,
+					  const __sigset_t *__ss,
+					  __SIZE_TYPE__ __fdslen),
+		       __ppoll_chk)
+  __warnattr ("ppoll called with fds buffer too small file nfds entries");
+
+__extern_always_inline int
+ppoll (struct pollfd *__fds, nfds_t __nfds, const struct timespec *__timeout,
+       const __sigset_t *__ss)
+{
+  if (__bos (__fds) != (__SIZE_TYPE__) -1)
+    {
+      if (! __builtin_constant_p (__nfds))
+	return __ppoll_chk (__fds, __nfds, __timeout, __ss, __bos (__fds));
+      else if (__bos (__fds) / sizeof (*__fds) < __nfds)
+	return __ppoll_chk_warn (__fds, __nfds, __timeout, __ss,
+				 __bos (__fds));
+    }
+
+  return __ppoll_alias (__fds, __nfds, __timeout, __ss);
+}
+#endif
diff --git a/io/ppoll.c b/io/ppoll.c
index a035cfeb1f..b161a47b3d 100644
--- a/io/ppoll.c
+++ b/io/ppoll.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2006, 2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
 
@@ -73,4 +73,5 @@ ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
 #ifndef ppoll
 /* __poll handles cancellation.  */
 LIBC_CANCEL_HANDLED ();
+libc_hidden_def (ppoll);
 #endif
diff --git a/io/sys/poll.h b/io/sys/poll.h
index a9bd18005a..c0a7e04099 100644
--- a/io/sys/poll.h
+++ b/io/sys/poll.h
@@ -71,4 +71,10 @@ extern int ppoll (struct pollfd *__fds, nfds_t __nfds,
 
 __END_DECLS
 
+
+/* Define some inlines helping to catch common problems.  */
+#if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline
+# include <bits/poll2.h>
+#endif
+
 #endif	/* sys/poll.h */