[src/trunk]: src/tests/net/bpfilter Add bpfilternegjmp test.

[alnsn <alnsn%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/43811470d7b0
branches:  trunk
changeset: 336094:43811470d7b0
user:      alnsn <alnsn%NetBSD.org@localhost>
date:      Wed Feb 11 23:39:07 2015 +0000

description:
Add bpfilternegjmp test.

diffstat:

 tests/net/bpfilter/t_bpfilter.c |  29 +++++++++++++++++++++++++++--
 1 files changed, 27 insertions(+), 2 deletions(-)

diffs (64 lines):

diff -r 80827642d1c2 -r 43811470d7b0 tests/net/bpfilter/t_bpfilter.c
--- a/tests/net/bpfilter/t_bpfilter.c   Wed Feb 11 23:33:16 2015 +0000
+++ b/tests/net/bpfilter/t_bpfilter.c   Wed Feb 11 23:39:07 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_bpfilter.c,v 1.9 2015/02/11 19:37:37 alnsn Exp $     */
+/*     $NetBSD: t_bpfilter.c,v 1.10 2015/02/11 23:39:07 alnsn Exp $    */
 
 /*-
  * Copyright (c) 2012 The NetBSD Foundation, Inc.
@@ -25,7 +25,7 @@
  * SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_bpfilter.c,v 1.9 2015/02/11 19:37:37 alnsn Exp $");
+__RCSID("$NetBSD: t_bpfilter.c,v 1.10 2015/02/11 23:39:07 alnsn Exp $");
 
 #include <sys/param.h>
 #include <sys/ioctl.h>
@@ -120,6 +120,12 @@
        BPF_STMT(BPF_RET+BPF_A, 0),
 };
 
+static struct bpf_insn negjmp_prog[] = {
+       BPF_STMT(BPF_JMP+BPF_JA, 0),
+       BPF_STMT(BPF_JMP+BPF_JA, UINT32_MAX - 1), // -2
+       BPF_STMT(BPF_RET+BPF_A, 0),
+};
+
 static struct bpf_insn badret_prog[] = {
        BPF_STMT(BPF_RET+BPF_A+0x8000, 0),
 };
@@ -414,6 +420,24 @@
        ATF_CHECK_ERRNO(EINVAL, send_bpf_prog("bpfilterbadjmp", &prog) == -1);
 }
 
+ATF_TC(bpfilternegjmp);
+ATF_TC_HEAD(bpfilternegjmp, tc)
+{
+
+       atf_tc_set_md_var(tc, "descr", "Checks that bpf program that "
+           "jumps backwards is rejected by the kernel");
+       atf_tc_set_md_var(tc, "timeout", "30");
+}
+
+ATF_TC_BODY(bpfilternegjmp, tc)
+{
+       struct bpf_program prog;
+
+       prog.bf_len = __arraycount(negjmp_prog);
+       prog.bf_insns = negjmp_prog;
+       ATF_CHECK_ERRNO(EINVAL, send_bpf_prog("bpfilternegjmp", &prog) == -1);
+}
+
 ATF_TC(bpfilterbadret);
 ATF_TC_HEAD(bpfilterbadret, tc)
 {
@@ -451,6 +475,7 @@
        ATF_TP_ADD_TC(tp, bpfilternoinitA);
        ATF_TP_ADD_TC(tp, bpfilternoinitX);
        ATF_TP_ADD_TC(tp, bpfilterbadjmp);
+       ATF_TP_ADD_TC(tp, bpfilternegjmp);
        ATF_TP_ADD_TC(tp, bpfilterbadret);
 
        return atf_no_error();