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      1 #include <sys/types.h>
      2 #include <sys/ioctl.h>
      3 
      4 #include <net/bpf.h>
      5 
      6 #include <atf-c.h>
      7 #include <fcntl.h>
      8 
      9 #include <rump/rump.h>
     10 #include <rump/rump_syscalls.h>
     11 
     12 ATF_TC(div_by_zero);
     13 ATF_TC_HEAD(div_by_zero, tc)
     14 {
     15 
     16 	atf_tc_set_md_var(tc, "descr", "Check that BPF rejects a filter "
     17 	    "which divides by 0");
     18 }
     19 
     20 ATF_TC_BODY(div_by_zero, tc)
     21 {
     22 	struct bpf_program bp;
     23 	int fd;
     24 
     25 	/*
     26 	 * Source code for following program:
     27 	 * link[0:4]/0 = 2
     28 	 */
     29 	struct bpf_insn bins[] = {
     30 	    { 0x20, 0, 0, 0x00000000 },
     31 	    { 0x34, 0, 0, 0x00000000 },
     32 	    { 0x15, 0, 1, 0x00000002 },
     33 	    { 0x6, 0, 0, 0x00000060 },
     34 	    { 0x6, 0, 0, 0x00000000 },
     35 	};
     36 
     37 	bp.bf_len = __arraycount(bins);
     38 	bp.bf_insns = bins;
     39 
     40 	rump_init();
     41 	fd = rump_sys_open("/dev/bpf", O_RDWR);
     42 	ATF_CHECK(fd != -1);
     43 	ATF_REQUIRE_EQ_MSG(rump_sys_ioctl(fd, BIOCSETF, &bp), -1,
     44 	    "bpf accepted program with division by zero");
     45 }
     46 
     47 ATF_TP_ADD_TCS(tp)
     48 {
     49 
     50 	ATF_TP_ADD_TC(tp, div_by_zero);
     51 	return atf_no_error();
     52 }
     53