bpf: Set run context for rawtp test_run callback

syzbot reported crash when rawtp program executed through the
test_run interface calls bpf_get_attach_cookie helper or any
other helper that touches task->bpf_ctx pointer.

Setting the run context (task->bpf_ctx pointer) for test_run
callback.

Fixes: 7adfc6c ("bpf: Add bpf_get_attach_cookie() BPF helper to access bpf_cookie value")
Reported-by: [email protected]
Signed-off-by: Jiri Olsa <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Closes: https://syzkaller.appspot.com/bug?extid=3ab78ff125b7979e45f9
Link: https://lore.kernel.org/bpf/[email protected]

Author: olsajiri

net/bpf/test_run.c

@@ -727,10 +727,16 @@ static void
 __bpf_prog_test_run_raw_tp(void *data)
 {
 	struct bpf_raw_tp_test_run_info *info = data;
+	struct bpf_trace_run_ctx run_ctx = {};
+	struct bpf_run_ctx *old_run_ctx;
+
+	old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
 
 	rcu_read_lock();
 	info->retval = bpf_prog_run(info->prog, info->ctx);
 	rcu_read_unlock();
+
+	bpf_reset_run_ctx(old_run_ctx);
 }
 
 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,