Implement longjmp checking for s390.

2 files changed, 47 insertions, 1 deletions

diff --git a/sysdeps/s390/s390-32/____longjmp_chk.c b/sysdeps/s390/s390-32/____longjmp_chk.c
new file mode 100644
index 0000000000..c5eb721e0e
--- /dev/null
+++ b/sysdeps/s390/s390-32/____longjmp_chk.c
@@ -0,0 +1,41 @@
+/* Copyright (C) 2009 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>.
+
+   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 <errno.h>
+#include <sysdep.h>
+#include <setjmp.h>
+#include <bits/setjmp.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#define __longjmp ____longjmp_chk
+
+#define CHECK_SP(env, guard) \
+  do									\
+    {									\
+      uintptr_t cur_sp;							\
+      uintptr_t new_sp = env->__gregs[9];				\
+      __asm ("lr %0, %%r15" : "=r" (cur_sp));				\
+      new_sp ^= guard;							\
+      if (new_sp < cur_sp)						\
+	__fortify_fail ("longjmp causes uninitialized stack frame");	\
+    } while (0)
+
+#include "__longjmp.c"
diff --git a/sysdeps/s390/s390-32/__longjmp.c b/sysdeps/s390/s390-32/__longjmp.c
index c47ebbc52a..4abc0ec81c 100644
--- a/sysdeps/s390/s390-32/__longjmp.c
+++ b/sysdeps/s390/s390-32/__longjmp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000, 2001, 2005 Free Software Foundation, Inc.
+/* Copyright (C) 2000, 2001, 2005, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
 
@@ -33,6 +33,11 @@ __longjmp (__jmp_buf env, int val)
 #ifdef PTR_DEMANGLE
   register uintptr_t r3 __asm ("%r3") = THREAD_GET_POINTER_GUARD ();
   register void *r1 __asm ("%r1") = (void *) env;
+# ifdef CHECK_SP
+  CHECK_SP (env, r3);
+# endif
+#elif defined CHECK_SP
+  CHECK_SP (env, 0);
 #endif
   /* Restore registers and jump back.  */
   asm volatile ("ld   %%f6,48(%1)\n\t"