From patchwork Tue Sep 17 08:50:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13806012 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B58C01531DB; Tue, 17 Sep 2024 08:51:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563119; cv=none; b=ISjnLojvzUmtFzJU9XExfkBZyjoVjgn9r/fGhRuEyuGvED30F+fsUXppSaIWBZDpMJD5anICb8f9DApFoHOvjjXWprD/RFB5/o/o612VOnSK5V4UW8wI83UAmZEORVVuE+Ymnm8pRGsdDoNkOZ9XgrbPNsHRqAkt7EKQXnQXjBQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563119; c=relaxed/simple; bh=3lpH1TcPLZZROLVAgrsQatm8wpUWuKts3MBt4vGURUI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HfGil3WW0MDllRJLiXj21pj+s2PQzdrWrqszjzvLEkLRqKu2cfgt70pd92I1Zp49sJB55IIRLy/EWmxmj6H0EsKg3hQG0hYJuuahHYj38TuHRPwlkf5ZeyfM9oDBmN/Th6EmFXt9Rt6iStuXyP41lkJ4uiadRKjxxcA1FxoNNh4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L4uS4nmN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="L4uS4nmN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9862C4CEC5; Tue, 17 Sep 2024 08:51:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563119; bh=3lpH1TcPLZZROLVAgrsQatm8wpUWuKts3MBt4vGURUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L4uS4nmNrX9yNY8rSKjBlncd45hMw2rnIl7ZfZcxP02kXJ12JTiOILIYGAnwZrZbz s3FBpuuCakwJHKN3oopgMvJQ14wmn7MpYaPc5BpoyY8TEIATdzkExyc0n5yN13ZIuJ rgLSu2oKwQi2duedPCh+1E7bKRT2l7TboCnynGUywWg87F6PiX95QmEimm5SaUnuAj HWomALSlbhBzzbsoMhQd2zPVUq1wAcbk5Gaxw1r35lvYzIJV4kgk99QueyqcUx2kjO 3bFwhpZeQd8TWUyTGvKZf12yoJ5Na1Icc8X9GOqMZ4xJ1ruUcC1snjjw8AFrb0Dk8p i4hb6zaCscz2g== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 07/14] libbpf: Add support for uprobe multi session attach Date: Tue, 17 Sep 2024 10:50:17 +0200 Message-ID: <20240917085024.765883-8-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Adding support to attach program in uprobe session mode with bpf_program__attach_uprobe_multi function. Adding session bool to bpf_uprobe_multi_opts struct that allows to load and attach the bpf program via uprobe session. the attachment to create uprobe multi session. Also adding new program loader section that allows: SEC("uprobe.session/bpf_fentry_test*") and loads/attaches uprobe program as uprobe session. Adding sleepable hook (uprobe.session.s) as well. Signed-off-by: Jiri Olsa --- tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 21 ++++++++++++++++++--- tools/lib/bpf/libbpf.h | 4 +++- 3 files changed, 22 insertions(+), 4 deletions(-) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 2a4c71501a17..becdfa701c75 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -776,6 +776,7 @@ int bpf_link_create(int prog_fd, int target_fd, return libbpf_err(-EINVAL); break; case BPF_TRACE_UPROBE_MULTI: + case BPF_TRACE_UPROBE_SESSION: attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0); attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0); attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0)); diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 6917d4a0bd4e..83e56856b2b4 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -9363,8 +9363,10 @@ static const struct bpf_sec_def section_defs[] = { SEC_DEF("kprobe.session+", KPROBE, BPF_TRACE_KPROBE_SESSION, SEC_NONE, attach_kprobe_session), SEC_DEF("uprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi), SEC_DEF("uretprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi), + SEC_DEF("uprobe.session+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_NONE, attach_uprobe_multi), SEC_DEF("uprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi), SEC_DEF("uretprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi), + SEC_DEF("uprobe.session.s+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_SLEEPABLE, attach_uprobe_multi), SEC_DEF("ksyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall), SEC_DEF("kretsyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall), SEC_DEF("usdt+", KPROBE, 0, SEC_USDT, attach_usdt), @@ -11684,7 +11686,10 @@ static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, stru ret = 0; break; case 3: - opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi"); + if (str_has_pfx(probe_type, "uprobe.session")) + opts.session = true; + else + opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi"); *link = bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_name, &opts); ret = libbpf_get_error(*link); break; @@ -11933,10 +11938,12 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog, const unsigned long *ref_ctr_offsets = NULL, *offsets = NULL; LIBBPF_OPTS(bpf_link_create_opts, lopts); unsigned long *resolved_offsets = NULL; + enum bpf_attach_type attach_type; int err = 0, link_fd, prog_fd; struct bpf_link *link = NULL; char errmsg[STRERR_BUFSIZE]; char full_path[PATH_MAX]; + bool retprobe, session; const __u64 *cookies; const char **syms; size_t cnt; @@ -12007,12 +12014,20 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog, offsets = resolved_offsets; } + retprobe = OPTS_GET(opts, retprobe, false); + session = OPTS_GET(opts, session, false); + + if (retprobe && session) + return libbpf_err_ptr(-EINVAL); + + attach_type = session ? BPF_TRACE_UPROBE_SESSION : BPF_TRACE_UPROBE_MULTI; + lopts.uprobe_multi.path = path; lopts.uprobe_multi.offsets = offsets; lopts.uprobe_multi.ref_ctr_offsets = ref_ctr_offsets; lopts.uprobe_multi.cookies = cookies; lopts.uprobe_multi.cnt = cnt; - lopts.uprobe_multi.flags = OPTS_GET(opts, retprobe, false) ? BPF_F_UPROBE_MULTI_RETURN : 0; + lopts.uprobe_multi.flags = retprobe ? BPF_F_UPROBE_MULTI_RETURN : 0; if (pid == 0) pid = getpid(); @@ -12026,7 +12041,7 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog, } link->detach = &bpf_link__detach_fd; - link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &lopts); + link_fd = bpf_link_create(prog_fd, 0, attach_type, &lopts); if (link_fd < 0) { err = -errno; pr_warn("prog '%s': failed to attach multi-uprobe: %s\n", diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 64a6a3d323e3..f6a7835dc519 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -569,10 +569,12 @@ struct bpf_uprobe_multi_opts { size_t cnt; /* create return uprobes */ bool retprobe; + /* create session kprobes */ + bool session; size_t :0; }; -#define bpf_uprobe_multi_opts__last_field retprobe +#define bpf_uprobe_multi_opts__last_field session /** * @brief **bpf_program__attach_uprobe_multi()** attaches a BPF program