Disallow bpf_probe_read() and bpf_probe_read_str() helpers in raw_tracepoint bpf programs that use in-kernel BTF to track types of memory accesses. Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> --- kernel/trace/bpf_trace.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 52f7e9d8c29b..7c607f79f1bb 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -700,6 +700,8 @@ tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) case BPF_FUNC_map_peek_elem: return &bpf_map_peek_elem_proto; case BPF_FUNC_probe_read: + if (prog->expected_attach_type) + return NULL; return &bpf_probe_read_proto; case BPF_FUNC_ktime_get_ns: return &bpf_ktime_get_ns_proto; @@ -728,6 +730,8 @@ tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) case BPF_FUNC_get_prandom_u32: return &bpf_get_prandom_u32_proto; case BPF_FUNC_probe_read_str: + if (prog->expected_attach_type) + return NULL; return &bpf_probe_read_str_proto; #ifdef CONFIG_CGROUPS case BPF_FUNC_get_current_cgroup_id: -- 2.20.0
