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authorUlrich Drepper <drepper@redhat.com>2008-01-09 19:35:21 +0000
committerUlrich Drepper <drepper@redhat.com>2008-01-09 19:35:21 +0000
commit148e12ed122d75506937cdc8ab2654f8449f2061 (patch)
tree74e26dbc976cabefc08145aeac3d3a373ea54470 /stdlib/tst-makecontext2.c
parent71edcafa976a9716a3a848a93c29763e4a3c3002 (diff)
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* sysdeps/unix/sysv/linux/i386/makecontext.S (__makecontext): Avoid
clobbering memory at or above uc_stack.ss_sp + uc_stack.ss_size. * stdlib/Makefile: Add rules to build and run tst-makecontext2. * stdlib/tst-makecontext2.c: New test.
Diffstat (limited to 'stdlib/tst-makecontext2.c')
-rw-r--r--stdlib/tst-makecontext2.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/stdlib/tst-makecontext2.c b/stdlib/tst-makecontext2.c
new file mode 100644
index 0000000..903ccf6
--- /dev/null
+++ b/stdlib/tst-makecontext2.c
@@ -0,0 +1,80 @@
+/* Copyright (C) 2008 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 <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ucontext.h>
+#include <tst-stack-align.h>
+
+ucontext_t ucp, ucp2;
+char st1[262144] __attribute__((aligned (16)));
+
+void
+cf (int i, int j)
+{
+ if (i != 78 || j != 274)
+ {
+ printf ("i %d j %d\n", i, j);
+ exit (1);
+ }
+ else if (TEST_STACK_ALIGN ())
+ {
+ puts ("insufficiently aligned stack");
+ exit (2);
+ }
+}
+
+int
+do_test (void)
+{
+ for (size_t j = 32; j < 64; j += sizeof (long))
+ {
+ if (getcontext (&ucp) != 0)
+ {
+ if (errno == ENOSYS)
+ {
+ puts ("context handling not supported");
+ return 0;
+ }
+
+ puts ("getcontext failed");
+ return 1;
+ }
+ ucp.uc_link = &ucp2;
+ ucp.uc_stack.ss_sp = st1;
+ ucp.uc_stack.ss_size = sizeof (st1) - j;
+ memset (&st1[sizeof (st1) - j], 0x55, j);
+ makecontext (&ucp, (void (*) (void)) cf, 2, 78, 274);
+ if (swapcontext (&ucp2, &ucp) != 0)
+ {
+ puts ("setcontext failed");
+ return 1;
+ }
+
+ for (size_t i = j; i > 0; i--)
+ if (st1[sizeof (st1) - j + i - 1] != 0x55)
+ { printf ("fail %zd %zd\n", i, j); break; }
+ }
+
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"