From nobody Tue Nov 26 11:41:43 2024 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 6D677204953; Fri, 18 Oct 2024 20:42:20 +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=1729284140; cv=none; b=IsojjcO3tj43Z2CZixR+dbCvWx8WHuocfL5wrzKbWzIEtz2TMA1n5OzNXfCzXwMWt2VPgat0mFC1fu5GPoNXN09FbASa6WF9ilRYD1no700DXKXqnxM3yEa6Lhg/O5kNUxxaeVlP1q5fU0nArH6xJGs5PqE+Pcj95mx9UXJYDxY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729284140; c=relaxed/simple; bh=DxW/KBqi6/DBmyzf1midTZ0gP5HMdtwGGGkMPIckHwc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WLhvjQSmj04Ut40RFPkofSkGWu+oGHXn16SAKL0Le3rY/Mvdzo59UppeXnA6l8d/QKalJlE9S3JmJZ9LCJvaDl3pVa+f8jfTNkYz31N5E7neXJTwgg/zAAr/m+ifnR5xDL/Pv+TANCa/ComFjxOZTwRXCNdOELYDdS7eFNsrXaY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oJrZhr9c; 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="oJrZhr9c" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0D0B2C4CEC3; Fri, 18 Oct 2024 20:42:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729284140; bh=DxW/KBqi6/DBmyzf1midTZ0gP5HMdtwGGGkMPIckHwc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oJrZhr9cvJm/A1K1Zeo9JBrH5QX48nJugD2JeJEvgnQG/EgetVSpyiiw9ZCsQW4UC fiVPkISDVFB25vQmeDPv2JKI8/ktd8XlKRZzKqStNvfd8IXzjz1clfvNqK/QLS30ZU 53SEY1RTplEEFh2G7/2cW3+H1IK6U2fK8kyLQXXRH7Pj3MDM5KzxcLSck+sFHEtNgD Cix/jI3PRCbvP1LoDG7QobfxvlxCOD4zavT4ZSmgBShr3ki2+VlQ+WXipy4pJwxAs6 Up4z2kVjUUmELi0a6/NtPeE1a0hqJyltvqD2eNpnaE501ekd3gcklOr4iTF2f6o7zk MLcqLBUWqVr6w== 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: [PATCHv8 bpf-next 05/13] libbpf: Add support for uprobe multi session attach Date: Fri, 18 Oct 2024 22:41:01 +0200 Message-ID: <20241018204109.713820-6-jolsa@kernel.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241018204109.713820-1-jolsa@kernel.org> References: <20241018204109.713820-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 18 ++++++++++++++++-- tools/lib/bpf/libbpf.h | 4 +++- 3 files changed, 20 insertions(+), 3 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 =3D OPTS_GET(opts, uprobe_multi.flag= s, 0); attr.link_create.uprobe_multi.cnt =3D OPTS_GET(opts, uprobe_multi.cnt, 0= ); attr.link_create.uprobe_multi.path =3D 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 e650809e7170..c45cd48840ae 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -9410,8 +9410,10 @@ static const struct bpf_sec_def section_defs[] =3D { SEC_DEF("kprobe.session+", KPROBE, BPF_TRACE_KPROBE_SESSION, SEC_NONE, at= tach_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, att= ach_uprobe_multi), + SEC_DEF("uprobe.session+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_NONE, at= tach_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_SLEEPAB= LE, attach_uprobe_multi), + SEC_DEF("uprobe.session.s+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_SLEEPA= BLE, 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), @@ -11733,7 +11735,9 @@ static int attach_uprobe_multi(const struct bpf_pro= gram *prog, long cookie, stru ret =3D 0; break; case 3: + opts.session =3D str_has_pfx(probe_type, "uprobe.session"); opts.retprobe =3D str_has_pfx(probe_type, "uretprobe.multi"); + *link =3D bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_n= ame, &opts); ret =3D libbpf_get_error(*link); break; @@ -11982,10 +11986,12 @@ bpf_program__attach_uprobe_multi(const struct bpf= _program *prog, const unsigned long *ref_ctr_offsets =3D NULL, *offsets =3D NULL; LIBBPF_OPTS(bpf_link_create_opts, lopts); unsigned long *resolved_offsets =3D NULL; + enum bpf_attach_type attach_type; int err =3D 0, link_fd, prog_fd; struct bpf_link *link =3D NULL; char errmsg[STRERR_BUFSIZE]; char full_path[PATH_MAX]; + bool retprobe, session; const __u64 *cookies; const char **syms; size_t cnt; @@ -12056,12 +12062,20 @@ bpf_program__attach_uprobe_multi(const struct bpf= _program *prog, offsets =3D resolved_offsets; } =20 + retprobe =3D OPTS_GET(opts, retprobe, false); + session =3D OPTS_GET(opts, session, false); + + if (retprobe && session) + return libbpf_err_ptr(-EINVAL); + + attach_type =3D session ? BPF_TRACE_UPROBE_SESSION : BPF_TRACE_UPROBE_MUL= TI; + lopts.uprobe_multi.path =3D path; lopts.uprobe_multi.offsets =3D offsets; lopts.uprobe_multi.ref_ctr_offsets =3D ref_ctr_offsets; lopts.uprobe_multi.cookies =3D cookies; lopts.uprobe_multi.cnt =3D cnt; - lopts.uprobe_multi.flags =3D OPTS_GET(opts, retprobe, false) ? BPF_F_UPRO= BE_MULTI_RETURN : 0; + lopts.uprobe_multi.flags =3D retprobe ? BPF_F_UPROBE_MULTI_RETURN : 0; =20 if (pid =3D=3D 0) pid =3D getpid(); @@ -12075,7 +12089,7 @@ bpf_program__attach_uprobe_multi(const struct bpf_p= rogram *prog, } link->detach =3D &bpf_link__detach_fd; =20 - link_fd =3D bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &lopts); + link_fd =3D bpf_link_create(prog_fd, 0, attach_type, &lopts); if (link_fd < 0) { err =3D -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 91484303849c..b2ce3a72b11d 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -577,10 +577,12 @@ struct bpf_uprobe_multi_opts { size_t cnt; /* create return uprobes */ bool retprobe; + /* create session kprobes */ + bool session; size_t :0; }; =20 -#define bpf_uprobe_multi_opts__last_field retprobe +#define bpf_uprobe_multi_opts__last_field session =20 /** * @brief **bpf_program__attach_uprobe_multi()** attaches a BPF program --=20 2.46.2