[src/trunk]: src/tests/net/bpfjit Add bpfjit_jmp_ja_overflow test.

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

details:   https://anonhg.NetBSD.org/src/rev/23ad70c68e57
branches:  trunk
changeset: 336092:23ad70c68e57
user:      alnsn <alnsn%NetBSD.org@localhost>
date:      Wed Feb 11 23:29:48 2015 +0000

description:
Add bpfjit_jmp_ja_overflow test.

diffstat:

 tests/net/bpfjit/t_bpfjit.c |  35 +++++++++++++++++++++++++++++++++--
 1 files changed, 33 insertions(+), 2 deletions(-)

diffs (63 lines):

diff -r e8d81fb030eb -r 23ad70c68e57 tests/net/bpfjit/t_bpfjit.c
--- a/tests/net/bpfjit/t_bpfjit.c       Wed Feb 11 23:17:16 2015 +0000
+++ b/tests/net/bpfjit/t_bpfjit.c       Wed Feb 11 23:29:48 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_bpfjit.c,v 1.5 2015/02/11 22:37:55 alnsn Exp $ */
+/*     $NetBSD: t_bpfjit.c,v 1.6 2015/02/11 23:29:48 alnsn Exp $ */
 
 /*-
  * Copyright (c) 2011-2012, 2014 Alexander Nasonov.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_bpfjit.c,v 1.5 2015/02/11 22:37:55 alnsn Exp $");
+__RCSID("$NetBSD: t_bpfjit.c,v 1.6 2015/02/11 23:29:48 alnsn Exp $");
 
 #include <sys/param.h>
 #include <sys/mbuf.h>
@@ -1700,6 +1700,36 @@
        ATF_CHECK(code == NULL);
 }
 
+ATF_TC(bpfjit_jmp_ja_overflow);
+ATF_TC_HEAD(bpfjit_jmp_ja_overflow, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Test BPF_JMP+BPF_JA with negative offset");
+}
+
+ATF_TC_BODY(bpfjit_jmp_ja_overflow, tc)
+{
+       static struct bpf_insn insns[] = {
+               BPF_STMT(BPF_JMP+BPF_JA, 1),
+               BPF_STMT(BPF_RET+BPF_K, 777),
+               BPF_STMT(BPF_JMP+BPF_JA, UINT32_MAX - 1), // -2
+               BPF_STMT(BPF_RET+BPF_K, 0)
+       };
+
+       bpfjit_func_t code;
+       size_t insn_count = sizeof(insns) / sizeof(insns[0]);
+
+       RZ(rump_init());
+
+       /* Jumps with negative offsets work only in userspace. */
+       ATF_CHECK(!prog_validate(insns, insn_count));
+
+       rump_schedule();
+       code = rumpns_bpfjit_generate_code(NULL, insns, insn_count);
+       rump_unschedule();
+       ATF_CHECK(code == NULL);
+}
+
 ATF_TC(bpfjit_jmp_jgt_k);
 ATF_TC_HEAD(bpfjit_jmp_jgt_k, tc)
 {
@@ -4491,6 +4521,7 @@
        ATF_TP_ADD_TC(tp, bpfjit_alu_neg);
        ATF_TP_ADD_TC(tp, bpfjit_jmp_ja);
        ATF_TP_ADD_TC(tp, bpfjit_jmp_ja_invalid);
+       ATF_TP_ADD_TC(tp, bpfjit_jmp_ja_overflow);
        ATF_TP_ADD_TC(tp, bpfjit_jmp_jgt_k);
        ATF_TP_ADD_TC(tp, bpfjit_jmp_jge_k);
        ATF_TP_ADD_TC(tp, bpfjit_jmp_jeq_k);