From: Alexei Starovoitov <ast@kernel.org>
Date: Thu, 12 May 2022 18:10:25 -0700
Subject: selftests/bpf: Check combination of jit blinding and pointers to bpf
 subprogs.
Patch-mainline: v5.19-rc1
Git-commit: 365d519923a279af379a8d0f641ef50e44bb610e
References: jsc#PED-1377

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
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 tools/testing/selftests/bpf/progs/test_subprogs.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- 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;
 }