selftests/bpf: Check combination of jit blinding and pointers to bpf subprogs.

Check that ld_imm64 with src_reg=1 (aka BPF_PSEUDO_FUNC) works
with jit_blinding.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220513011025.13344-2-alexei.starovoitov@gmail.com

diff --git a/tools/testing/selftests/bpf/progs/test_subprogs.c b/tools/testing/selftests/bpf/progs/test_subprogs.c
index b7c37ca..f8e9256 100644 (file)
--- a/tools/testing/selftests/bpf/progs/test_subprogs.c
+++ b/tools/testing/selftests/bpf/progs/test_subprogs.c
@@ -89,6 +89,11 @@ int prog2(void *ctx)
        return 0;
 }
 
+static int empty_callback(__u32 index, void *data)
+{
+       return 0;
+}
+
 /* prog3 has the same section name as prog1 */
 SEC("raw_tp/sys_enter")
 int prog3(void *ctx)
@@ -98,6 +103,9 @@ int prog3(void *ctx)
        if (!BPF_CORE_READ(t, pid) || !get_task_tgid((uintptr_t)t))
                return 1;
 
+       /* test that ld_imm64 with BPF_PSEUDO_FUNC doesn't get blinded */
+       bpf_loop(1, empty_callback, NULL, 0);
+
        res3 = sub3(5) + 6; /* (5 + 3 + (4 + 1)) + 6 = 19 */
        return 0;
 }