From patchwork Tue Jun 20 16:30:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13286162 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F317EB64D7 for ; Tue, 20 Jun 2023 16:30:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229601AbjFTQa3 (ORCPT ); Tue, 20 Jun 2023 12:30:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230453AbjFTQaY (ORCPT ); Tue, 20 Jun 2023 12:30:24 -0400 Received: from mail-pg1-x534.google.com (mail-pg1-x534.google.com [IPv6:2607:f8b0:4864:20::534]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF1F8100; Tue, 20 Jun 2023 09:30:22 -0700 (PDT) Received: by mail-pg1-x534.google.com with SMTP id 41be03b00d2f7-54fbcfe65caso3962326a12.1; Tue, 20 Jun 2023 09:30:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687278622; x=1689870622; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=/gElHMt7ru6hC4YTlAvkaeRJX96aRe9JlJT1poAWmAI=; b=DNij9L7w88Hv9sa8c8tYmm8O1Qhi0UXS65+IN2iJxBSOSniQRhPxUBGFSMbGosQ8VN NzHsahy7k0Cy4WRicvUpmoEkfwZHPSiy5WjGLKpknq0LG7HE0oq7RO67riyJ7s9BD0MC AeCtquX2fjq45xbjy0JADiSfDorUrs8Qr5rSHYj2v3yDnNqXvVQiArbKmsr3Jg08csTa pyms5XRes9KUwQyzsXB2tZNaG05BQF7ITjfz4GiPr0b2+KjoQxD+RI7OScxKIoB2aHa1 HWwnktqnS0zJLJZVe9pZZ9GMGajkmvLMXRekbB9zlczGe3lw6fxg9RUcimedJWMApHYY 0Z+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687278622; x=1689870622; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=/gElHMt7ru6hC4YTlAvkaeRJX96aRe9JlJT1poAWmAI=; b=XlWiXJbIygrdgCequFTyOiEBK7hfqRE6BPXZ1CsY06ulFs3e0vU1kZN+sPUS66WXQf +x+dJHh/k96qCS76HBPafSQXKtts3JfNEKXVCT5A3/QpkZ8F9HHn2djE8IYGlw/uDcmT TwtgU7uNC/ATAzZuX/4J/tPvhJo6g+834De5+FKDYypAAsJjIHmIVBArTsNiUaqvMo/B 4pnabopsoRwA2D7ijRoJuaReyEPur8xSh6tWcA/ztoqy5+23n9TwIUSPkk4ucrnX4sw1 S9VDH0srr1U9OsJCnuFOujudLOr8E9NXdch4rrdhtQ3mtshrKlFm01bBXNew1QugO8Qx mCbA== X-Gm-Message-State: AC+VfDye0NFyo0MMJvahfVw/pt+mYtanJuQyJrqEioT1RQ8snl48wMMt WKrRWnXXRTbd9VXqYS9S6YuBlJiNFbqhY3l7oS4= X-Google-Smtp-Source: ACHHUZ5TZpkQbAB992bJO2WnlzBuCYfCBMrLLUAytxeVr8Pb239IMfVivcyxr8S15/j/NK9fvg4UIA== X-Received: by 2002:a17:90b:d89:b0:25e:8501:6662 with SMTP id bg9-20020a17090b0d8900b0025e85016662mr24455888pjb.7.1687278622046; Tue, 20 Jun 2023 09:30:22 -0700 (PDT) Received: from vultr.guest ([2001:19f0:ac02:b96:5400:4ff:fe7b:3b23]) by smtp.gmail.com with ESMTPSA id t8-20020a17090a3b4800b0025c1cfdb93esm1854286pjf.13.2023.06.20.09.30.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jun 2023 09:30:21 -0700 (PDT) From: Yafang Shao To: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, quentin@isovalent.com, rostedt@goodmis.org, mhiramat@kernel.org Cc: bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yafang Shao Subject: [PATCH v4 bpf-next 03/11] bpftool: Show kprobe_multi link info Date: Tue, 20 Jun 2023 16:30:00 +0000 Message-Id: <20230620163008.3718-4-laoar.shao@gmail.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230620163008.3718-1-laoar.shao@gmail.com> References: <20230620163008.3718-1-laoar.shao@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org Show the already expose kprobe_multi link info in bpftool. The result as follows, $ tools/bpf/bpftool/bpftool link show 11: kprobe_multi prog 42 kprobe.multi func_cnt 7 addr func ffffffffa2c40f20 schedule_timeout_interruptible ffffffffa2c40f60 schedule_timeout_killable ffffffffa2c40fa0 schedule_timeout_uninterruptible ffffffffa2c40fe0 schedule_timeout_idle ffffffffc0fb18d0 xfs_trans_get_efd [xfs] ffffffffc0fbea10 xfs_trans_get_buf_map [xfs] ffffffffc0fc2320 xfs_trans_get_dqtrx [xfs] pids kprobe_multi(25725) 12: kprobe_multi prog 42 kretprobe.multi func_cnt 7 addr func ffffffffa2c40f20 schedule_timeout_interruptible ffffffffa2c40f60 schedule_timeout_killable ffffffffa2c40fa0 schedule_timeout_uninterruptible ffffffffa2c40fe0 schedule_timeout_idle ffffffffc0fb18d0 xfs_trans_get_efd [xfs] ffffffffc0fbea10 xfs_trans_get_buf_map [xfs] ffffffffc0fc2320 xfs_trans_get_dqtrx [xfs] pids kprobe_multi(25725) $ tools/bpf/bpftool/bpftool link show -j [{"id":11,"type":"kprobe_multi","prog_id":42,"retprobe":false,"func_cnt":7,"funcs":[{"addr":18446744072145342240,"func":"schedule_timeout_interruptible","module":""},{"addr":18446744072145342304,"func":"schedule_timeout_killable","module":""},{"addr":18446744072145342368,"func":"schedule_timeout_uninterruptible","module":""},{"addr":18446744072145342432,"func":"schedule_timeout_idle","module":""},{"addr":18446744072652265680,"func":"xfs_trans_get_efd","module":"xfs"},{"addr":18446744072652319248,"func":"xfs_trans_get_buf_map","module":"xfs"},{"addr":18446744072652333856,"func":"xfs_trans_get_dqtrx","module":"xfs"}],"pids":[{"pid":25725,"comm":"kprobe_multi"}]},{"id":12,"type":"kprobe_multi","prog_id":42,"retprobe":true,"func_cnt":7,"funcs":[{"addr":18446744072145342240,"func":"schedule_timeout_interruptible","module":""},{"addr":18446744072145342304,"func":"schedule_timeout_killable","module":""},{"addr":18446744072145342368,"func":"schedule_timeout_uninterruptible","module":""},{"addr":18446744072145342432,"func":"schedule_timeout_idle","module":""},{"addr":18446744072652265680,"func":"xfs_trans_get_efd","module":"xfs"},{"addr":18446744072652319248,"func":"xfs_trans_get_buf_map","module":"xfs"},{"addr":18446744072652333856,"func":"xfs_trans_get_dqtrx","module":"xfs"}],"pids":[{"pid":25725,"comm":"kprobe_multi"}]}] When kptr_restrict is 2, the result is, $ tools/bpf/bpftool/bpftool link show 11: kprobe_multi prog 42 kprobe.multi func_cnt 7 12: kprobe_multi prog 42 kretprobe.multi func_cnt 7 Signed-off-by: Yafang Shao --- tools/bpf/bpftool/link.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 108 insertions(+), 1 deletion(-) diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c index 2d78607..90b51de 100644 --- a/tools/bpf/bpftool/link.c +++ b/tools/bpf/bpftool/link.c @@ -14,8 +14,10 @@ #include "json_writer.h" #include "main.h" +#include "xlated_dumper.h" static struct hashmap *link_table; +static struct dump_data dd = {}; static int link_parse_fd(int *argc, char ***argv) { @@ -166,6 +168,45 @@ static int get_prog_info(int prog_id, struct bpf_prog_info *info) return err; } +static int cmp_u64(const void *A, const void *B) +{ + const __u64 *a = A, *b = B; + + return *a - *b; +} + +static void +show_kprobe_multi_json(struct bpf_link_info *info, json_writer_t *wtr) +{ + __u32 i, j = 0; + __u64 *addrs; + + jsonw_bool_field(json_wtr, "retprobe", + info->kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN); + jsonw_uint_field(json_wtr, "func_cnt", info->kprobe_multi.count); + jsonw_name(json_wtr, "funcs"); + jsonw_start_array(json_wtr); + addrs = (__u64 *)u64_to_ptr(info->kprobe_multi.addrs); + qsort((void *)addrs, info->kprobe_multi.count, sizeof(__u64), cmp_u64); + + /* Load it once for all. */ + if (!dd.sym_count) + kernel_syms_load(&dd); + for (i = 0; i < dd.sym_count; i++) { + if (dd.sym_mapping[i].address != addrs[j]) + continue; + jsonw_start_object(json_wtr); + jsonw_uint_field(json_wtr, "addr", dd.sym_mapping[i].address); + jsonw_string_field(json_wtr, "func", dd.sym_mapping[i].name); + /* Print none if it is vmlinux */ + jsonw_string_field(json_wtr, "module", dd.sym_mapping[i].module); + jsonw_end_object(json_wtr); + if (j++ == info->kprobe_multi.count) + break; + } + jsonw_end_array(json_wtr); +} + static int show_link_close_json(int fd, struct bpf_link_info *info) { struct bpf_prog_info prog_info; @@ -218,6 +259,9 @@ static int show_link_close_json(int fd, struct bpf_link_info *info) jsonw_uint_field(json_wtr, "map_id", info->struct_ops.map_id); break; + case BPF_LINK_TYPE_KPROBE_MULTI: + show_kprobe_multi_json(info, json_wtr); + break; default: break; } @@ -351,6 +395,44 @@ void netfilter_dump_plain(const struct bpf_link_info *info) printf(" flags 0x%x", info->netfilter.flags); } +static void show_kprobe_multi_plain(struct bpf_link_info *info) +{ + __u32 i, j = 0; + __u64 *addrs; + + if (!info->kprobe_multi.count) + return; + + if (info->kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN) + printf("\n\tkretprobe.multi "); + else + printf("\n\tkprobe.multi "); + printf("func_cnt %u ", info->kprobe_multi.count); + addrs = (__u64 *)u64_to_ptr(info->kprobe_multi.addrs); + qsort((void *)addrs, info->kprobe_multi.count, sizeof(__u64), cmp_u64); + + /* Load it once for all. */ + if (!dd.sym_count) + kernel_syms_load(&dd); + if (!dd.sym_count) + return; + + printf("\n\t%-16s %s", "addr", "func"); + for (i = 0; i < dd.sym_count; i++) { + if (dd.sym_mapping[i].address != addrs[j]) + continue; + printf("\n\t%016lx %s", + dd.sym_mapping[i].address, dd.sym_mapping[i].name); + if (dd.sym_mapping[i].module[0] != '\0') + printf(" [%s] ", dd.sym_mapping[i].module); + else + printf(" "); + + if (j++ == info->kprobe_multi.count) + break; + } +} + static int show_link_close_plain(int fd, struct bpf_link_info *info) { struct bpf_prog_info prog_info; @@ -396,6 +478,9 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info) case BPF_LINK_TYPE_NETFILTER: netfilter_dump_plain(info); break; + case BPF_LINK_TYPE_KPROBE_MULTI: + show_kprobe_multi_plain(info); + break; default: break; } @@ -417,7 +502,9 @@ static int do_show_link(int fd) { struct bpf_link_info info; __u32 len = sizeof(info); + __u64 *addrs = NULL; char buf[256]; + int count; int err; memset(&info, 0, sizeof(info)); @@ -441,12 +528,28 @@ static int do_show_link(int fd) info.iter.target_name_len = sizeof(buf); goto again; } + if (info.type == BPF_LINK_TYPE_KPROBE_MULTI && + !info.kprobe_multi.addrs) { + count = info.kprobe_multi.count; + if (count) { + addrs = calloc(count, sizeof(__u64)); + if (!addrs) { + p_err("mem alloc failed"); + close(fd); + return -1; + } + info.kprobe_multi.addrs = (unsigned long)addrs; + goto again; + } + } if (json_output) show_link_close_json(fd, &info); else show_link_close_plain(fd, &info); + if (addrs) + free(addrs); close(fd); return 0; } @@ -471,7 +574,8 @@ static int do_show(int argc, char **argv) fd = link_parse_fd(&argc, &argv); if (fd < 0) return fd; - return do_show_link(fd); + do_show_link(fd); + goto out; } if (argc) @@ -510,6 +614,9 @@ static int do_show(int argc, char **argv) if (show_pinned) delete_pinned_obj_table(link_table); +out: + if (dd.sym_count) + kernel_syms_destroy(&dd); return errno == ENOENT ? 0 : -1; }