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Message-ID: <YHNEJ2K/22vxr7vs@krava>
Date: Sun, 11 Apr 2021 20:47:03 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Julia Lawall <julia.lawall@...ia.fr>
Cc: Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andriin@...com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
netdev@...r.kernel.org, bpf@...r.kernel.org,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
kbuild-all@...ts.01.org
Subject: Re: [PATCHv3 bpf-next 1/5] bpf: Allow trampoline re-attach for
tracing and lsm programs (fwd)
On Sun, Apr 11, 2021 at 07:54:34PM +0200, Julia Lawall wrote:
> Please check the goto on line 2663. Is an unlock needed here?
oops, yes, it's missing unlock.. I'll send new version
thanks,
jirka
>
> julia
>
> ---------- Forwarded message ----------
> Date: Mon, 12 Apr 2021 01:28:54 +0800
> From: kernel test robot <lkp@...el.com>
> To: kbuild@...ts.01.org
> Cc: lkp@...el.com, Julia Lawall <julia.lawall@...6.fr>
> Subject: Re: [PATCHv3 bpf-next 1/5] bpf: Allow trampoline re-attach for tracing
> and lsm programs
>
> CC: kbuild-all@...ts.01.org
> In-Reply-To: <20210411130010.1337650-2-jolsa@...nel.org>
> References: <20210411130010.1337650-2-jolsa@...nel.org>
> TO: Jiri Olsa <jolsa@...nel.org>
> TO: Alexei Starovoitov <ast@...nel.org>
> TO: Daniel Borkmann <daniel@...earbox.net>
> TO: Andrii Nakryiko <andriin@...com>
> CC: "Toke Høiland-Jørgensen" <toke@...hat.com>
> CC: netdev@...r.kernel.org
> CC: bpf@...r.kernel.org
> CC: Martin KaFai Lau <kafai@...com>
> CC: Song Liu <songliubraving@...com>
> CC: Yonghong Song <yhs@...com>
> CC: John Fastabend <john.fastabend@...il.com>
>
> Hi Jiri,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on bpf-next/master]
>
> url: https://github.com/0day-ci/linux/commits/Jiri-Olsa/bpf-Tracing-and-lsm-programs-re-attach/20210411-210314
> base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
> :::::: branch date: 4 hours ago
> :::::: commit date: 4 hours ago
> config: x86_64-allyesconfig (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Julia Lawall <julia.lawall@...6.fr>
>
>
> cocci warnings: (new ones prefixed by >>)
> >> kernel/bpf/syscall.c:2738:1-7: preceding lock on line 2633
>
> vim +2738 kernel/bpf/syscall.c
>
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2564
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2565 static int bpf_tracing_prog_attach(struct bpf_prog *prog,
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2566 int tgt_prog_fd,
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2567 u32 btf_id)
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2568 {
> a3b80e1078943d Andrii Nakryiko 2020-04-28 2569 struct bpf_link_primer link_primer;
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2570 struct bpf_prog *tgt_prog = NULL;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2571 struct bpf_trampoline *tr = NULL;
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2572 struct bpf_tracing_link *link;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2573 u64 key = 0;
> a3b80e1078943d Andrii Nakryiko 2020-04-28 2574 int err;
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2575
> 9e4e01dfd3254c KP Singh 2020-03-29 2576 switch (prog->type) {
> 9e4e01dfd3254c KP Singh 2020-03-29 2577 case BPF_PROG_TYPE_TRACING:
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2578 if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
> be8704ff07d237 Alexei Starovoitov 2020-01-20 2579 prog->expected_attach_type != BPF_TRACE_FEXIT &&
> 9e4e01dfd3254c KP Singh 2020-03-29 2580 prog->expected_attach_type != BPF_MODIFY_RETURN) {
> 9e4e01dfd3254c KP Singh 2020-03-29 2581 err = -EINVAL;
> 9e4e01dfd3254c KP Singh 2020-03-29 2582 goto out_put_prog;
> 9e4e01dfd3254c KP Singh 2020-03-29 2583 }
> 9e4e01dfd3254c KP Singh 2020-03-29 2584 break;
> 9e4e01dfd3254c KP Singh 2020-03-29 2585 case BPF_PROG_TYPE_EXT:
> 9e4e01dfd3254c KP Singh 2020-03-29 2586 if (prog->expected_attach_type != 0) {
> 9e4e01dfd3254c KP Singh 2020-03-29 2587 err = -EINVAL;
> 9e4e01dfd3254c KP Singh 2020-03-29 2588 goto out_put_prog;
> 9e4e01dfd3254c KP Singh 2020-03-29 2589 }
> 9e4e01dfd3254c KP Singh 2020-03-29 2590 break;
> 9e4e01dfd3254c KP Singh 2020-03-29 2591 case BPF_PROG_TYPE_LSM:
> 9e4e01dfd3254c KP Singh 2020-03-29 2592 if (prog->expected_attach_type != BPF_LSM_MAC) {
> 9e4e01dfd3254c KP Singh 2020-03-29 2593 err = -EINVAL;
> 9e4e01dfd3254c KP Singh 2020-03-29 2594 goto out_put_prog;
> 9e4e01dfd3254c KP Singh 2020-03-29 2595 }
> 9e4e01dfd3254c KP Singh 2020-03-29 2596 break;
> 9e4e01dfd3254c KP Singh 2020-03-29 2597 default:
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2598 err = -EINVAL;
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2599 goto out_put_prog;
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2600 }
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2601
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2602 if (!!tgt_prog_fd != !!btf_id) {
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2603 err = -EINVAL;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2604 goto out_put_prog;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2605 }
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2606
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2607 if (tgt_prog_fd) {
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2608 /* For now we only allow new targets for BPF_PROG_TYPE_EXT */
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2609 if (prog->type != BPF_PROG_TYPE_EXT) {
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2610 err = -EINVAL;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2611 goto out_put_prog;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2612 }
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2613
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2614 tgt_prog = bpf_prog_get(tgt_prog_fd);
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2615 if (IS_ERR(tgt_prog)) {
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2616 err = PTR_ERR(tgt_prog);
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2617 tgt_prog = NULL;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2618 goto out_put_prog;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2619 }
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2620
> 22dc4a0f5ed11b Andrii Nakryiko 2020-12-03 2621 key = bpf_trampoline_compute_key(tgt_prog, NULL, btf_id);
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2622 }
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2623
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2624 link = kzalloc(sizeof(*link), GFP_USER);
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2625 if (!link) {
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2626 err = -ENOMEM;
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2627 goto out_put_prog;
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2628 }
> f2e10bff16a0fd Andrii Nakryiko 2020-04-28 2629 bpf_link_init(&link->link, BPF_LINK_TYPE_TRACING,
> f2e10bff16a0fd Andrii Nakryiko 2020-04-28 2630 &bpf_tracing_link_lops, prog);
> f2e10bff16a0fd Andrii Nakryiko 2020-04-28 2631 link->attach_type = prog->expected_attach_type;
> 70ed506c3bbcfa Andrii Nakryiko 2020-03-02 2632
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 @2633 mutex_lock(&prog->aux->dst_mutex);
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2634
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2635 /* There are a few possible cases here:
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2636 *
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2637 * - if prog->aux->dst_trampoline is set, the program was just loaded
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2638 * and not yet attached to anything, so we can use the values stored
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2639 * in prog->aux
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2640 *
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2641 * - if prog->aux->dst_trampoline is NULL, the program has already been
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2642 * attached to a target and its initial target was cleared (below)
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2643 *
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2644 * - if tgt_prog != NULL, the caller specified tgt_prog_fd +
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2645 * target_btf_id using the link_create API.
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2646 *
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2647 * - if tgt_prog == NULL when this function was called using the old
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2648 * raw_tracepoint_open API, and we need a target from prog->aux
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2649 *
> fc909cd5516914 Jiri Olsa 2021-04-11 2650 * - if prog->aux->dst_trampoline and tgt_prog is NULL, the program
> fc909cd5516914 Jiri Olsa 2021-04-11 2651 * was detached and is going for re-attachment.
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2652 */
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2653 if (!prog->aux->dst_trampoline && !tgt_prog) {
> fc909cd5516914 Jiri Olsa 2021-04-11 2654 /*
> fc909cd5516914 Jiri Olsa 2021-04-11 2655 * Allow re-attach for TRACING and LSM programs. If it's
> fc909cd5516914 Jiri Olsa 2021-04-11 2656 * currently linked, bpf_trampoline_link_prog will fail.
> fc909cd5516914 Jiri Olsa 2021-04-11 2657 * EXT programs need to specify tgt_prog_fd, so they
> fc909cd5516914 Jiri Olsa 2021-04-11 2658 * re-attach in separate code path.
> fc909cd5516914 Jiri Olsa 2021-04-11 2659 */
> fc909cd5516914 Jiri Olsa 2021-04-11 2660 if (prog->type != BPF_PROG_TYPE_TRACING &&
> fc909cd5516914 Jiri Olsa 2021-04-11 2661 prog->type != BPF_PROG_TYPE_LSM) {
> fc909cd5516914 Jiri Olsa 2021-04-11 2662 err = -EINVAL;
> fc909cd5516914 Jiri Olsa 2021-04-11 2663 goto out_put_prog;
> fc909cd5516914 Jiri Olsa 2021-04-11 2664 }
> fc909cd5516914 Jiri Olsa 2021-04-11 2665 btf_id = prog->aux->attach_btf_id;
> fc909cd5516914 Jiri Olsa 2021-04-11 2666 key = bpf_trampoline_compute_key(NULL, prog->aux->attach_btf, btf_id);
> babf3164095b06 Andrii Nakryiko 2020-03-09 2667 }
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2668
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2669 if (!prog->aux->dst_trampoline ||
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2670 (key && key != prog->aux->dst_trampoline->key)) {
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2671 /* If there is no saved target, or the specified target is
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2672 * different from the destination specified at load time, we
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2673 * need a new trampoline and a check for compatibility
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2674 */
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2675 struct bpf_attach_target_info tgt_info = {};
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2676
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2677 err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2678 &tgt_info);
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2679 if (err)
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2680 goto out_unlock;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2681
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2682 tr = bpf_trampoline_get(key, &tgt_info);
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2683 if (!tr) {
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2684 err = -ENOMEM;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2685 goto out_unlock;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2686 }
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2687 } else {
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2688 /* The caller didn't specify a target, or the target was the
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2689 * same as the destination supplied during program load. This
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2690 * means we can reuse the trampoline and reference from program
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2691 * load time, and there is no need to allocate a new one. This
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2692 * can only happen once for any program, as the saved values in
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2693 * prog->aux are cleared below.
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2694 */
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2695 tr = prog->aux->dst_trampoline;
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2696 tgt_prog = prog->aux->dst_prog;
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2697 }
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2698
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2699 err = bpf_link_prime(&link->link, &link_primer);
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2700 if (err)
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2701 goto out_unlock;
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2702
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2703 err = bpf_trampoline_link_prog(prog, tr);
> babf3164095b06 Andrii Nakryiko 2020-03-09 2704 if (err) {
> a3b80e1078943d Andrii Nakryiko 2020-04-28 2705 bpf_link_cleanup(&link_primer);
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2706 link = NULL;
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2707 goto out_unlock;
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2708 }
> babf3164095b06 Andrii Nakryiko 2020-03-09 2709
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2710 link->tgt_prog = tgt_prog;
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2711 link->trampoline = tr;
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2712
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2713 /* Always clear the trampoline and target prog from prog->aux to make
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2714 * sure the original attach destination is not kept alive after a
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2715 * program is (re-)attached to another target.
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2716 */
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2717 if (prog->aux->dst_prog &&
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2718 (tgt_prog_fd || tr != prog->aux->dst_trampoline))
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2719 /* got extra prog ref from syscall, or attaching to different prog */
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2720 bpf_prog_put(prog->aux->dst_prog);
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2721 if (prog->aux->dst_trampoline && tr != prog->aux->dst_trampoline)
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2722 /* we allocated a new trampoline, so free the old one */
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2723 bpf_trampoline_put(prog->aux->dst_trampoline);
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2724
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2725 prog->aux->dst_prog = NULL;
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2726 prog->aux->dst_trampoline = NULL;
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2727 mutex_unlock(&prog->aux->dst_mutex);
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2728
> a3b80e1078943d Andrii Nakryiko 2020-04-28 2729 return bpf_link_settle(&link_primer);
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2730 out_unlock:
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2731 if (tr && tr != prog->aux->dst_trampoline)
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2732 bpf_trampoline_put(tr);
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2733 mutex_unlock(&prog->aux->dst_mutex);
> 3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2734 kfree(link);
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2735 out_put_prog:
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2736 if (tgt_prog_fd && tgt_prog)
> 4a1e7c0c63e02d Toke Høiland-Jørgensen 2020-09-29 2737 bpf_prog_put(tgt_prog);
> fec56f5890d93f Alexei Starovoitov 2019-11-14 @2738 return err;
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2739 }
> fec56f5890d93f Alexei Starovoitov 2019-11-14 2740
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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