From patchwork Fri Jun 23 14:15:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13290672 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 3BB54AD3B for ; Fri, 23 Jun 2023 14:16:23 +0000 (UTC) Received: from mail-ot1-x330.google.com (mail-ot1-x330.google.com [IPv6:2607:f8b0:4864:20::330]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 475731FE3; Fri, 23 Jun 2023 07:16:21 -0700 (PDT) Received: by mail-ot1-x330.google.com with SMTP id 46e09a7af769-6b720fe3431so620703a34.3; Fri, 23 Jun 2023 07:16:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687529780; x=1690121780; 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=x89rCGzIlm3iq2VodxuXVFQMkLYGEL2HattOp/c5i4Y=; b=X36zRlsPLIZqSY9xMSkGTq/s+H7v5WlTi0Yd2b/RraDtiiz0Gkn7lu86yAhWhNeJlC fFhRUW2G8ao4U4+NOvxSycaZ0PVCfFMJuAbz2AdFt9+EOKmTZ5dGhnIa6Pz+iEUFqiHM XoyRVicQ7nvJD7mGPOaHyt9rMHaD0BTelvFpNEFsvONlHTo54nGN3cuoaxFmQ3NVWpxu 5hS71BIH4QdCH2Kmcc7uV6+1/WoechSXBbImRgfGaa5zh9RZz4zJj4mjYdF2Xq3DNIG6 vkLy58V1SIwwUSuK0EOvRfuC+TnmDyuUvtgC/q4SlUyZ62f6xAJGkWa+8kNFuKMy9XOA wfSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687529780; x=1690121780; 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=x89rCGzIlm3iq2VodxuXVFQMkLYGEL2HattOp/c5i4Y=; b=iYmKdKpXtWy0tvTuLW30edJE7OCeYnUeMJCs9z+vQSQxbAtF1tCSdm5ikHviqEaRB2 2cVVvd5JwDz8+C44ZkK4dAS7WDV7143EbseIne/FZvMiuWcyRFxEM1nXsxH3GZvzFcBh hjonJOzBLVk+T8E3EFHKL2BqjCF+0l0mOF19T/kilAdHCeid/0F06XWk50i3RNROjgPE D1oZrrR43s+6QHZFrLW92TdsB1MuqxyQ0YgEiMd9zPt/I3eoTBvWhLi0qPlncqslGrag sAFchSEqY1y9ZUgeMfpuJyYqpUS05nvKMAtOGSkGoAEtP+XQrsaYooAssPRJIYXGFP7p XktQ== X-Gm-Message-State: AC+VfDyvOwF6C//i+Murqg8TFF6c8+toA4XjlJ69wpHNS+C2lp2Pre9K 4p7qI/7tMeO6DL5y30P0IQ0= X-Google-Smtp-Source: ACHHUZ54zTdupKNg/2XT9HU+SXhAIaJsk3+jnYSbwkYSEExJvJm5XZ9avCTE6uKiKVtGO06wcaFOug== X-Received: by 2002:a05:6830:1182:b0:6b5:8be9:3b8d with SMTP id u2-20020a056830118200b006b58be93b8dmr13146854otq.17.1687529780457; Fri, 23 Jun 2023 07:16:20 -0700 (PDT) Received: from vultr.guest ([2001:19f0:ac01:1058:5400:4ff:fe7c:972]) by smtp.gmail.com with ESMTPSA id p14-20020a63e64e000000b005533c53f550sm6505942pgj.45.2023.06.23.07.16.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Jun 2023 07:16:19 -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 v5 bpf-next 03/11] bpftool: Show kprobe_multi link info Date: Fri, 23 Jun 2023 14:15:38 +0000 Message-Id: <20230623141546.3751-4-laoar.shao@gmail.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230623141546.3751-1-laoar.shao@gmail.com> References: <20230623141546.3751-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net Show the already expose kprobe_multi link info in bpftool. The result as follows, $ tools/bpf/bpftool/bpftool link show 4: kprobe_multi prog 22 kprobe.multi func_cnt 7 addr func [module] ffffffffbbc44f20 schedule_timeout_interruptible ffffffffbbc44f60 schedule_timeout_killable ffffffffbbc44fa0 schedule_timeout_uninterruptible ffffffffbbc44fe0 schedule_timeout_idle ffffffffc08028d0 xfs_trans_get_efd [xfs] ffffffffc080fa10 xfs_trans_get_buf_map [xfs] ffffffffc0813320 xfs_trans_get_dqtrx [xfs] pids kprobe_multi(1434978) 5: kprobe_multi prog 22 kretprobe.multi func_cnt 7 addr func [module] ffffffffbbc44f20 schedule_timeout_interruptible ffffffffbbc44f60 schedule_timeout_killable ffffffffbbc44fa0 schedule_timeout_uninterruptible ffffffffbbc44fe0 schedule_timeout_idle ffffffffc08028d0 xfs_trans_get_efd [xfs] ffffffffc080fa10 xfs_trans_get_buf_map [xfs] ffffffffc0813320 xfs_trans_get_dqtrx [xfs] pids kprobe_multi(1434978) $ tools/bpf/bpftool/bpftool link show -j [{"id":4,"type":"kprobe_multi","prog_id":22,"retprobe":false,"func_cnt":7,"funcs":[{"addr":18446744072564789024,"func":"schedule_timeout_interruptible","module":""},{"addr":18446744072564789088,"func":"schedule_timeout_killable","module":""},{"addr":18446744072564789152,"func":"schedule_timeout_uninterruptible","module":""},{"addr":18446744072564789216,"func":"schedule_timeout_idle","module":""},{"addr":18446744072644208848,"func":"xfs_trans_get_efd","module":"xfs"},{"addr":18446744072644262416,"func":"xfs_trans_get_buf_map","module":"xfs"},{"addr":18446744072644277024,"func":"xfs_trans_get_dqtrx","module":"xfs"}],"pids":[{"pid":1434978,"comm":"kprobe_multi"}]},{"id":5,"type":"kprobe_multi","prog_id":22,"retprobe":true,"func_cnt":7,"funcs":[{"addr":18446744072564789024,"func":"schedule_timeout_interruptible","module":""},{"addr":18446744072564789088,"func":"schedule_timeout_killable","module":""},{"addr":18446744072564789152,"func":"schedule_timeout_uninterruptible","module":""},{"addr":18446744072564789216,"func":"schedule_timeout_idle","module":""},{"addr":18446744072644208848,"func":"xfs_trans_get_efd","module":"xfs"},{"addr":18446744072644262416,"func":"xfs_trans_get_buf_map","module":"xfs"},{"addr":18446744072644277024,"func":"xfs_trans_get_dqtrx","module":"xfs"}],"pids":[{"pid":1434978,"comm":"kprobe_multi"}]}] When kptr_restrict is 2, the result is, $ tools/bpf/bpftool/bpftool link show 4: kprobe_multi prog 22 kprobe.multi func_cnt 7 5: kprobe_multi prog 22 kretprobe.multi func_cnt 7 Signed-off-by: Yafang Shao Reviewed-by: Quentin Monnet --- 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..8461e6d 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 [module]"); + 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; }