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authorMike Frysinger <vapier@gentoo.org>2013-12-29 23:15:03 +0000
committerMike Frysinger <vapier@gentoo.org>2014-02-08 06:59:13 -0500
commitac8cc9e300a002228eb7e660df3e7b333d9a7414 (patch)
tree09d4b7bacb899966e31926557917a5a50fff2019 /debug
parentc5bb8e2399f55c09a98c66936940ba744b5841da (diff)
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tst-longjmp_chk3: new test for checking sigaltstack edge cases
Make sure the longjmp checking logic catches stacks that are slightly outside of a valid alternative signal stack. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'debug')
-rw-r--r--debug/Makefile2
-rw-r--r--debug/tst-longjmp_chk3.c85
2 files changed, 87 insertions, 0 deletions
diff --git a/debug/Makefile b/debug/Makefile
index ab06c17..fc15ef3 100644
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -90,6 +90,8 @@ CFLAGS-tst-longjmp_chk.c = -fexceptions -fasynchronous-unwind-tables
CPPFLAGS-tst-longjmp_chk.c = -D_FORTIFY_SOURCE=1
CFLAGS-tst-longjmp_chk2.c = -fexceptions -fasynchronous-unwind-tables
CPPFLAGS-tst-longjmp_chk2.c = -D_FORTIFY_SOURCE=1
+CFLAGS-tst-longjmp_chk3.c = -fexceptions -fasynchronous-unwind-tables
+CPPFLAGS-tst-longjmp_chk3.c = -D_FORTIFY_SOURCE=1
# We know these tests have problems with format strings, this is what
# we are testing. Disable that warning.
diff --git a/debug/tst-longjmp_chk3.c b/debug/tst-longjmp_chk3.c
new file mode 100644
index 0000000..f0f67e5
--- /dev/null
+++ b/debug/tst-longjmp_chk3.c
@@ -0,0 +1,85 @@
+/* Make sure longjmp fortification catches bad signal stacks.
+ Copyright (C) 2013-2014 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <setjmp.h>
+#include <signal.h>
+#include <string.h>
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
+
+static char buf[SIGSTKSZ * 4];
+static jmp_buf jb;
+
+static void
+handler (int sig)
+{
+ if (sig == SIGUSR1)
+ {
+ if (setjmp (jb) != 0)
+ {
+ puts ("setjmp should not have been called");
+ kill (getpid (), SIGTERM);
+ }
+ }
+ else if (sig == SIGABRT)
+ {
+ /* Yeah it worked. */
+ _exit (0);
+ }
+}
+
+static int
+do_test (void)
+{
+ stack_t ss;
+
+ set_fortify_handler (handler);
+
+ /* Create a valid signal stack and enable it. */
+ ss.ss_sp = buf;
+ ss.ss_size = sizeof (buf);
+ ss.ss_flags = 0;
+ if (sigaltstack (&ss, NULL) < 0)
+ {
+ printf ("first sigaltstack failed: %m\n");
+ return 1;
+ }
+
+ /* Trigger the signal handler which will create a jmpbuf that points to the
+ end of the signal stack. */
+ signal (SIGUSR1, handler);
+ kill (getpid (), SIGUSR1);
+
+ /* Shrink the signal stack so the jmpbuf is now invalid.
+ We adjust the start & end to handle stacks that grow up & down. */
+ ss.ss_sp = buf + sizeof (buf) / 2;
+ ss.ss_size = sizeof (buf) / 4;
+ if (sigaltstack (&ss, NULL) < 0)
+ {
+ printf ("second sigaltstack failed: %m\n");
+ return 1;
+ }
+
+ /* This should fail. */
+ longjmp (jb, 1);
+
+ puts ("longjmp returned and shouldn't");
+ return 1;
+}