From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76B70C5DF61 for ; Thu, 7 Nov 2019 19:06:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3DABF21882 for ; Thu, 7 Nov 2019 19:06:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573153616; bh=Sbn3ybTEvzeqiGyMEWHQTXgaGD1Cpo1OcDhUh+UAgRk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qbhL8cOMvN0hewThmDelBcdG9a8bMLSCIRggojC5sBAoPT+HTN9n/lFmh86OF63YS 19kPaqMhB5gW+O2FQqLuVqg5yITLcrVzyS8igWgFocxfdsOqsebf8c1n6J5JRJpEAe VttKFdnMDRY/P/VxdksRaV+VnjGmj7aWi3joFViM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730663AbfKGTGu (ORCPT ); Thu, 7 Nov 2019 14:06:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:45070 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728002AbfKGTGu (ORCPT ); Thu, 7 Nov 2019 14:06:50 -0500 Received: from quaco.ghostprotocols.net (179-240-172-58.3g.claro.net.br [179.240.172.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 37ED821D7E; Thu, 7 Nov 2019 19:06:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573153608; bh=Sbn3ybTEvzeqiGyMEWHQTXgaGD1Cpo1OcDhUh+UAgRk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GjDt9Lj+b/rE0pf/zEBO8Y+3RG12CxAcOKwrD7uFK5LWHd8TbrgP5NnYHId6Mpm/4 lR7zs6ZOUw2GPs96EAKWvvxAP3oH9qygazeXC28FZqhCMVH7Q4x+zjTegXJi1dlXYv 2R8WVHbJpbF1+tkmEGgmnnKIx6wYetxKnghI2XMc= From: Arnaldo Carvalho de Melo To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Ian Rogers , Adrian Hunter , Alexander Shishkin , Alexei Starovoitov , Andi Kleen , Daniel Borkmann , Jin Yao , John Garry , Kan Liang , Mark Rutland , Martin KaFai Lau , Peter Zijlstra , Song Liu , Stephane Eranian , Yonghong Song , bpf@vger.kernel.org, clang-built-linux@googlegroups.com, netdev@vger.kernel.org, Arnaldo Carvalho de Melo Subject: [PATCH 41/63] perf parse: Add parse events handle error Date: Thu, 7 Nov 2019 15:59:49 -0300 Message-Id: <20191107190011.23924-42-acme@kernel.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191107190011.23924-1-acme@kernel.org> References: <20191107190011.23924-1-acme@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Ian Rogers Parse event error handling may overwrite one error string with another creating memory leaks. Introduce a helper routine that warns about multiple error messages as well as avoiding the memory leak. A reproduction of this problem can be seen with: perf stat -e c/c/ After this change this produces: WARNING: multiple event parsing errors event syntax error: 'c/c/' \___ unknown term valid terms: event,filter_rem,filter_opc0,edge,filter_isoc,filter_tid,filter_loc,filter_nc,inv,umask,filter_opc1,tid_en,thresh,filter_all_op,filter_not_nm,filter_state,filter_nm,config,config1,config2,name,period,percore Run 'perf list' for a list of valid events Usage: perf stat [] [] -e, --event event selector. use 'perf list' to list available events Signed-off-by: Ian Rogers Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Alexei Starovoitov Cc: Andi Kleen Cc: Daniel Borkmann Cc: Jin Yao Cc: John Garry Cc: Kan Liang Cc: Mark Rutland Cc: Martin KaFai Lau Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Song Liu Cc: Stephane Eranian Cc: Yonghong Song Cc: bpf@vger.kernel.org Cc: clang-built-linux@googlegroups.com Cc: netdev@vger.kernel.org Link: http://lore.kernel.org/lkml/20191030223448.12930-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/parse-events.c | 82 +++++++++++++++++++++------------- tools/perf/util/parse-events.h | 2 + tools/perf/util/pmu.c | 30 ++++++++----- 3 files changed, 71 insertions(+), 43 deletions(-) diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index d36b8129b27a..03e54a2d8685 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -182,6 +182,20 @@ static int tp_event_has_id(const char *dir_path, struct dirent *evt_dir) #define MAX_EVENT_LENGTH 512 +void parse_events__handle_error(struct parse_events_error *err, int idx, + char *str, char *help) +{ + if (WARN(!str, "WARNING: failed to provide error string\n")) { + free(help); + return; + } + WARN_ONCE(err->str, "WARNING: multiple event parsing errors\n"); + err->idx = idx; + free(err->str); + err->str = str; + free(err->help); + err->help = help; +} struct tracepoint_path *tracepoint_id_to_path(u64 config) { @@ -932,11 +946,11 @@ static int check_type_val(struct parse_events_term *term, return 0; if (err) { - err->idx = term->err_val; - if (type == PARSE_EVENTS__TERM_TYPE_NUM) - err->str = strdup("expected numeric value"); - else - err->str = strdup("expected string value"); + parse_events__handle_error(err, term->err_val, + type == PARSE_EVENTS__TERM_TYPE_NUM + ? strdup("expected numeric value") + : strdup("expected string value"), + NULL); } return -EINVAL; } @@ -972,8 +986,11 @@ static bool config_term_shrinked; static bool config_term_avail(int term_type, struct parse_events_error *err) { + char *err_str; + if (term_type < 0 || term_type >= __PARSE_EVENTS__TERM_TYPE_NR) { - err->str = strdup("Invalid term_type"); + parse_events__handle_error(err, -1, + strdup("Invalid term_type"), NULL); return false; } if (!config_term_shrinked) @@ -992,9 +1009,9 @@ config_term_avail(int term_type, struct parse_events_error *err) return false; /* term_type is validated so indexing is safe */ - if (asprintf(&err->str, "'%s' is not usable in 'perf stat'", - config_term_names[term_type]) < 0) - err->str = NULL; + if (asprintf(&err_str, "'%s' is not usable in 'perf stat'", + config_term_names[term_type]) >= 0) + parse_events__handle_error(err, -1, err_str, NULL); return false; } } @@ -1036,17 +1053,20 @@ do { \ case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE: CHECK_TYPE_VAL(STR); if (strcmp(term->val.str, "no") && - parse_branch_str(term->val.str, &attr->branch_sample_type)) { - err->str = strdup("invalid branch sample type"); - err->idx = term->err_val; + parse_branch_str(term->val.str, + &attr->branch_sample_type)) { + parse_events__handle_error(err, term->err_val, + strdup("invalid branch sample type"), + NULL); return -EINVAL; } break; case PARSE_EVENTS__TERM_TYPE_TIME: CHECK_TYPE_VAL(NUM); if (term->val.num > 1) { - err->str = strdup("expected 0 or 1"); - err->idx = term->err_val; + parse_events__handle_error(err, term->err_val, + strdup("expected 0 or 1"), + NULL); return -EINVAL; } break; @@ -1080,8 +1100,9 @@ do { \ case PARSE_EVENTS__TERM_TYPE_PERCORE: CHECK_TYPE_VAL(NUM); if ((unsigned int)term->val.num > 1) { - err->str = strdup("expected 0 or 1"); - err->idx = term->err_val; + parse_events__handle_error(err, term->err_val, + strdup("expected 0 or 1"), + NULL); return -EINVAL; } break; @@ -1089,9 +1110,9 @@ do { \ CHECK_TYPE_VAL(NUM); break; default: - err->str = strdup("unknown term"); - err->idx = term->err_term; - err->help = parse_events_formats_error_string(NULL); + parse_events__handle_error(err, term->err_term, + strdup("unknown term"), + parse_events_formats_error_string(NULL)); return -EINVAL; } @@ -1142,9 +1163,9 @@ static int config_term_tracepoint(struct perf_event_attr *attr, return config_term_common(attr, term, err); default: if (err) { - err->idx = term->err_term; - err->str = strdup("unknown term"); - err->help = strdup("valid terms: call-graph,stack-size\n"); + parse_events__handle_error(err, term->err_term, + strdup("unknown term"), + strdup("valid terms: call-graph,stack-size\n")); } return -EINVAL; } @@ -1323,10 +1344,12 @@ int parse_events_add_pmu(struct parse_events_state *parse_state, pmu = perf_pmu__find(name); if (!pmu) { - if (asprintf(&err->str, + char *err_str; + + if (asprintf(&err_str, "Cannot find PMU `%s'. Missing kernel support?", - name) < 0) - err->str = NULL; + name) >= 0) + parse_events__handle_error(err, -1, err_str, NULL); return -EINVAL; } @@ -2802,13 +2825,10 @@ void parse_events__clear_array(struct parse_events_array *a) void parse_events_evlist_error(struct parse_events_state *parse_state, int idx, const char *str) { - struct parse_events_error *err = parse_state->error; - - if (!err) + if (!parse_state->error) return; - err->idx = idx; - err->str = strdup(str); - WARN_ONCE(!err->str, "WARNING: failed to allocate error string"); + + parse_events__handle_error(parse_state->error, idx, strdup(str), NULL); } static void config_terms_list(char *buf, size_t buf_sz) diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 769e07cddaa2..34f58d24a06a 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -124,6 +124,8 @@ struct parse_events_state { struct list_head *terms; }; +void parse_events__handle_error(struct parse_events_error *err, int idx, + char *str, char *help); void parse_events__shrink_config_terms(void); int parse_events__is_hardcoded_term(struct parse_events_term *term); int parse_events_term__num(struct parse_events_term **term, diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index adbe97e941dd..f9f427d4c313 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -1050,9 +1050,9 @@ static int pmu_config_term(struct list_head *formats, if (err) { char *pmu_term = pmu_formats_string(formats); - err->idx = term->err_term; - err->str = strdup("unknown term"); - err->help = parse_events_formats_error_string(pmu_term); + parse_events__handle_error(err, term->err_term, + strdup("unknown term"), + parse_events_formats_error_string(pmu_term)); free(pmu_term); } return -EINVAL; @@ -1080,8 +1080,9 @@ static int pmu_config_term(struct list_head *formats, if (term->no_value && bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) { if (err) { - err->idx = term->err_val; - err->str = strdup("no value assigned for term"); + parse_events__handle_error(err, term->err_val, + strdup("no value assigned for term"), + NULL); } return -EINVAL; } @@ -1094,8 +1095,9 @@ static int pmu_config_term(struct list_head *formats, term->config, term->val.str); } if (err) { - err->idx = term->err_val; - err->str = strdup("expected numeric value"); + parse_events__handle_error(err, term->err_val, + strdup("expected numeric value"), + NULL); } return -EINVAL; } @@ -1108,11 +1110,15 @@ static int pmu_config_term(struct list_head *formats, max_val = pmu_format_max_value(format->bits); if (val > max_val) { if (err) { - err->idx = term->err_val; - if (asprintf(&err->str, - "value too big for format, maximum is %llu", - (unsigned long long)max_val) < 0) - err->str = strdup("value too big for format"); + char *err_str; + + parse_events__handle_error(err, term->err_val, + asprintf(&err_str, + "value too big for format, maximum is %llu", + (unsigned long long)max_val) < 0 + ? strdup("value too big for format") + : err_str, + NULL); return -EINVAL; } /* -- 2.21.0