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selftests/bpf: add a test case to check verifier pointer arithmetic

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With clang/llvm 4.0+, the test case is able to generate
the following pattern:
....
440: (b7) r1 = 15
441: (05) goto pc+73
515: (79) r6 = *(u64 *)(r10 -152)
516: (bf) r7 = r10
517: (07) r7 += -112
518: (bf) r2 = r7
519: (0f) r2 += r1
520: (71) r1 = *(u8 *)(r8 +0)
521: (73) *(u8 *)(r2 +45) = r1
....

commit 332270fdc8 ("bpf: enhance verifier to understand stack
pointer arithmetic") improved verifier to handle such a pattern.
This patch adds a C test case to actually generate such a pattern.
A dummy tracepoint interface is used to load the program
into the kernel.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yonghong Song
2017-05-02 19:58:14 -07:00
committed by David S. Miller
parent 4d463c4dbc
commit 6ead18fb18
3 changed files with 275 additions and 1 deletions
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16
tools/testing/selftests/bpf/test_progs.c
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@@ -268,6 +268,21 @@ out:
bpf_object__close(obj);
}
static void test_tcp_estats(void)
{
const char *file = "./test_tcp_estats.o";
int err, prog_fd;
struct bpf_object *obj;
__u32 duration = 0;
err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
CHECK(err, "", "err %d errno %d\n", err, errno);
if (err)
return;
bpf_object__close(obj);
}
int main(void)
{
struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
@@ -277,6 +292,7 @@ int main(void)
test_pkt_access();
test_xdp();
test_l4lb();
test_tcp_estats();
printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
return 0;