From mboxrd@z Thu Jan 1 00:00:00 1970 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 CF12F47F53; Fri, 6 Dec 2024 14:57:50 +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=1733497070; cv=none; b=IFXCM3/BVVh7oCrkqKaADbImHAZQKch3gyYOZadY+nsqkntI4Ew0J7nvATLkJpMX0x5MV3t/3PDO4n9mh6Xjgz+xSExO74M8THW1oFsMLW4YRbbLzSg0WkNJMGZFtOfgs4pgL795bJXr2Zh8C3EKNzElJX04Bk/84A5uJ027Zfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733497070; c=relaxed/simple; bh=DCCssZNn/b5dT4/Xy+0TsQMQiiIPiGgpX0mLjJQ3HYs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LI9QQLXJcMBhBw3Pm2LmLl6Z9HUMqxx8x8Shj2p5yLwNBJD8kKtLolr7dYGJgYF8PESDRtDnzz/ax5yvhj0ppvK8dkZjshtUipiCtJtGyJHNEpEGbEx9p5c6AX2Bs9HakaYMzUCplMZhu1TJDHHyYeBDWs7qilFyScCkPj6e0LQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RNxUz9UC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="RNxUz9UC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF44CC4CED1; Fri, 6 Dec 2024 14:57:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733497070; bh=DCCssZNn/b5dT4/Xy+0TsQMQiiIPiGgpX0mLjJQ3HYs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RNxUz9UCbf1JLFRbuOAojLFNJWEKd+ui8rpKXruWZokazBwn/1BTQcLiu18wJGw4c wDUqu9Tf/2Ki2Nj8+awDD6BCDSsSmEExfys9g7qKCCMcTbqBzcgIpMYKFpIZF6/Kc4 dxBiVcR1oKJpvMZPt92h4Vxn/8A5S3aU9AhDijtc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jiri Olsa , Tao Chen , Andrii Nakryiko , Alexei Starovoitov , Sasha Levin Subject: [PATCH 6.6 186/676] libbpf: Fix expected_attach_type set handling in program load callback Date: Fri, 6 Dec 2024 15:30:05 +0100 Message-ID: <20241206143700.613122537@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241206143653.344873888@linuxfoundation.org> References: <20241206143653.344873888@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tao Chen [ Upstream commit a400d08b3014a4f4e939366bb6fd769b9caff4c9 ] Referenced commit broke the logic of resetting expected_attach_type to zero for allowed program types if kernel doesn't yet support such field. We do need to overwrite and preserve expected_attach_type for multi-uprobe though, but that can be done explicitly in libbpf_prepare_prog_load(). Fixes: 5902da6d8a52 ("libbpf: Add uprobe multi link support to bpf_program__attach_usdt") Suggested-by: Jiri Olsa Signed-off-by: Tao Chen Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20240925153012.212866-1-chen.dylane@gmail.com Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin --- tools/lib/bpf/libbpf.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index ceed16a10285a..834b3e6bc72c3 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -6837,8 +6837,14 @@ static int libbpf_prepare_prog_load(struct bpf_program *prog, opts->prog_flags |= BPF_F_XDP_HAS_FRAGS; /* special check for usdt to use uprobe_multi link */ - if ((def & SEC_USDT) && kernel_supports(prog->obj, FEAT_UPROBE_MULTI_LINK)) + if ((def & SEC_USDT) && kernel_supports(prog->obj, FEAT_UPROBE_MULTI_LINK)) { + /* for BPF_TRACE_UPROBE_MULTI, user might want to query expected_attach_type + * in prog, and expected_attach_type we set in kernel is from opts, so we + * update both. + */ prog->expected_attach_type = BPF_TRACE_UPROBE_MULTI; + opts->expected_attach_type = BPF_TRACE_UPROBE_MULTI; + } if ((def & SEC_ATTACH_BTF) && !prog->attach_btf_id) { int btf_obj_fd = 0, btf_type_id = 0, err; @@ -6915,6 +6921,7 @@ static int bpf_object_load_prog(struct bpf_object *obj, struct bpf_program *prog load_attr.attach_btf_id = prog->attach_btf_id; load_attr.kern_version = kern_version; load_attr.prog_ifindex = prog->prog_ifindex; + load_attr.expected_attach_type = prog->expected_attach_type; /* specify func_info/line_info only if kernel supports them */ btf_fd = bpf_object__btf_fd(obj); @@ -6943,9 +6950,6 @@ static int bpf_object_load_prog(struct bpf_object *obj, struct bpf_program *prog insns_cnt = prog->insns_cnt; } - /* allow prog_prepare_load_fn to change expected_attach_type */ - load_attr.expected_attach_type = prog->expected_attach_type; - if (obj->gen_loader) { bpf_gen__prog_load(obj->gen_loader, prog->type, prog->name, license, insns, insns_cnt, &load_attr, -- 2.43.0