From df36e621418b0de4d4afec5f8002d45ee636bb5c Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Wed, 7 Aug 2019 14:39:53 -0700 Subject: selftests/bpf: add CO-RE relocs testing setup Add CO-RE relocation test runner. Add one simple test validating that libbpf's logic for searching for kernel image and loading BTF out of it works. Signed-off-by: Andrii Nakryiko Acked-by: Song Liu Signed-off-by: Alexei Starovoitov --- .../selftests/bpf/progs/test_core_reloc_kernel.c | 36 ++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c (limited to 'tools/testing/selftests/bpf/progs') diff --git a/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c b/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c new file mode 100644 index 000000000000..37e02aa3f0c8 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include +#include +#include "bpf_helpers.h" + +char _license[] SEC("license") = "GPL"; + +static volatile struct data { + char in[256]; + char out[256]; +} data; + +struct task_struct { + int pid; + int tgid; +}; + +SEC("raw_tracepoint/sys_enter") +int test_core_kernel(void *ctx) +{ + struct task_struct *task = (void *)bpf_get_current_task(); + uint64_t pid_tgid = bpf_get_current_pid_tgid(); + int pid, tgid; + + if (BPF_CORE_READ(&pid, &task->pid) || + BPF_CORE_READ(&tgid, &task->tgid)) + return 1; + + /* validate pid + tgid matches */ + data.out[0] = (((uint64_t)pid << 32) | tgid) == pid_tgid; + + return 0; +} + -- cgit v1.2.3-59-g8ed1b