From nobody Sat Nov 23 17:37:12 2024 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9879D13D893 for ; Tue, 19 Nov 2024 01:17:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731979050; cv=none; b=fAFZH9UpTj1xD4RJwAgqGzwr4naYyffDDrsA8OFf40m5NIGvH6dmPh9zz3po2eUrsG+opWKV6vwCcbFtAmLiW80co6Ebmrkrqq2PtbMGgJT5092A2ubx7bO7gUo0xQGT3uYfglVd1uaeRzlNUD5lSVP0fyOtS8ZbSQHBu3ze7Nk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731979050; c=relaxed/simple; bh=/CbhJo0NIgUB0KCfbS3Ow1Hrm07M2ACCA+WmmfLTdk8=; h=Date:In-Reply-To:Message-Id:Mime-Version:References:Subject:From: To:Content-Type; b=SIUOpgk7FoB9MOkqBg/xnaoikd8J5GWvmDqpBiNzu1uEwXYSyJ0RN/xb9o+7GzuSlgt+d4DZBOM1fOazxOw9fM0MScDOxum97tuIej+ngMGiYk+mvQZgqpS8Ihv3X9Vphwxx2Dn6kEVRNTOD3Ciidh6gwkzvFgg8drN52+GTMRs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=p0RqEjdJ; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="p0RqEjdJ" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6ee51558e90so67604857b3.1 for ; Mon, 18 Nov 2024 17:17:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1731979046; x=1732583846; darn=vger.kernel.org; h=to:from:subject:references:mime-version:message-id:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=isAY0YfEtXbULouihI9XfHEkMTzWUigK0hJ8gnm8q9k=; b=p0RqEjdJ46evA/Uh7bKlxORrcu1zvfoJQQAFC98bsbDp6w4UIiVcZEpSwhvqHTQjMp FYyMTd62UGCTBPY/qosGnQRtVE5EKbjSSbwYBK/falJg+qH4zWlrZRXpa/J8e0OIrMB6 7LiE+04fssqlAwxP8z2eAUgY8os4VHEMDKCVydKrTaeB/F+W+9CFO9woMw54D5QM5qZ6 TYy8l4kPr1lSloAhZaj2u7R8ogarZoAZ+WwEFalMEj5Grlm2Iq6Slr8G2tfDsAgbiCSK IFATpiU4ynoB1t3/G9/9ZhwA0f4k0IOwM2OH8Zel9MgPDEF/4yA2G1i7NI2j3gAy7bZm 6ZTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731979046; x=1732583846; h=to:from:subject:references:mime-version:message-id:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=isAY0YfEtXbULouihI9XfHEkMTzWUigK0hJ8gnm8q9k=; b=SjOvzDflCcGHibOMQTZQKmVob6OoLEhvUk+B7XZibAzVPD2Ct1jyJUEJDHhh1Iw9hd 17ylSXrTRTeOzSM4N/BAzuh19oFZihplef0paS5MnXAvfx5qVrgGrqzXLK5NeSmGrd0A FUzEkRfXfytn+WoDJPAayfj7aMm0FuhM/9C6TxcCD7HWoeavGdu2JW3j2P66+2iWxkBh T9phs38pWMGStnYERVnMR7KHtnZbVTUVbrmP6ikVRvYxZ1WSxQWoTOgKJX04/UnR3drq Mcps1dLSnRciTzC8SlKQD06XzMoV1yX5GeRMwp/fQ6PR/wDFUKxp4qbV9UWExXJBo7gH SFNQ== X-Forwarded-Encrypted: i=1; AJvYcCXR3rg1YvGG9L6u2grMLFLloK6wUCsW+GWb5WOcXweC/gI+tGmOdUKS744d3O1iTpHf8u0thed4FfeOjBA=@vger.kernel.org X-Gm-Message-State: AOJu0Yz4grxjVX+L7VWXB2VVQuDELUkOPHxNUyISdhRCdgKOJGWraZgZ jZIYjO+Vn6t52OcqcaCpNFoa4A6CaDxtQTdDJx2GJwJ7F/ne2uc/djgmCtqjRKEaGxL3DbCrEU+ GdKSBNg== X-Google-Smtp-Source: AGHT+IHZX+7Jb+2d4opeVjrsbxJXniCxR+KBCLpT/d/Kur/EzCUs9u2aJWg9HoZ3agM9btcjLB8/iGdTa753 X-Received: from irogers.svl.corp.google.com ([2620:15c:2c5:11:22a4:ded5:5c37:fcc7]) (user=irogers job=sendgmr) by 2002:a05:690c:3348:b0:6ea:8395:9af9 with SMTP id 00721157ae682-6ee55cb5a1cmr2057947b3.6.1731979046564; Mon, 18 Nov 2024 17:17:26 -0800 (PST) Date: Mon, 18 Nov 2024 17:16:28 -0800 In-Reply-To: <20241119011644.971342-1-irogers@google.com> Message-Id: <20241119011644.971342-7-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241119011644.971342-1-irogers@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Subject: [PATCH v7 06/22] perf script: Use openat for directory iteration From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , James Clark , Howard Chu , Athira Jajeev , Michael Petlan , Veronika Molnarova , Dapeng Mi , Thomas Richter , Ilya Leoshkevich , Colin Ian King , Weilin Wang , Andi Kleen , Josh Poimboeuf , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Rewrite the directory iteration to use openat so that large character arrays aren't needed. The arrays are warned about potential buffer overflows by GCC when the code exists in a single C file. Signed-off-by: Ian Rogers Acked-by: Namhyung Kim --- tools/perf/builtin-script.c | 87 +++++++++++++++++++++++++------------ tools/perf/util/path.c | 10 +++++ tools/perf/util/path.h | 1 + 3 files changed, 71 insertions(+), 27 deletions(-) diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c index 2a7e704c0a54..ebf9ac7a97b1 100644 --- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -3530,27 +3530,35 @@ static void free_dlarg(void) * which is covered well now. And new parsing code should be added to * cover the future complex formats like event groups etc. */ -static int check_ev_match(char *dir_name, char *scriptname, - struct perf_session *session) +static int check_ev_match(int dir_fd, const char *scriptname, struct perf_= session *session) { - char filename[MAXPATHLEN], evname[128]; - char line[BUFSIZ], *p; - struct evsel *pos; - int match, len; + char line[BUFSIZ]; FILE *fp; =20 - scnprintf(filename, MAXPATHLEN, "%s/bin/%s-record", dir_name, scriptname); + { + char filename[FILENAME_MAX + 5]; + int fd; =20 - fp =3D fopen(filename, "r"); - if (!fp) - return -1; + scnprintf(filename, sizeof(filename), "bin/%s-record", scriptname); + fd =3D openat(dir_fd, filename, O_RDONLY); + if (fd =3D=3D -1) + return -1; + fp =3D fdopen(fd, "r"); + if (!fp) + return -1; + } =20 while (fgets(line, sizeof(line), fp)) { - p =3D skip_spaces(line); + char *p =3D skip_spaces(line); + if (*p =3D=3D '#') continue; =20 while (strlen(p)) { + int match, len; + struct evsel *pos; + char evname[128]; + p =3D strstr(p, "-e"); if (!p) break; @@ -3593,7 +3601,7 @@ int find_scripts(char **scripts_array, char **scripts= _path_array, int num, int pathlen) { struct dirent *script_dirent, *lang_dirent; - char scripts_path[MAXPATHLEN], lang_path[MAXPATHLEN]; + int scripts_dir_fd, lang_dir_fd; DIR *scripts_dir, *lang_dir; struct perf_session *session; struct perf_data data =3D { @@ -3602,51 +3610,76 @@ int find_scripts(char **scripts_array, char **scrip= ts_path_array, int num, }; char *temp; int i =3D 0; + const char *exec_path =3D get_argv_exec_path(); =20 session =3D perf_session__new(&data, NULL); if (IS_ERR(session)) return PTR_ERR(session); =20 - snprintf(scripts_path, MAXPATHLEN, "%s/scripts", get_argv_exec_path()); + { + char scripts_path[PATH_MAX]; =20 - scripts_dir =3D opendir(scripts_path); + snprintf(scripts_path, sizeof(scripts_path), "%s/scripts", exec_path); + scripts_dir_fd =3D open(scripts_path, O_DIRECTORY); + pr_err("Failed to open directory '%s'", scripts_path); + if (scripts_dir_fd =3D=3D -1) { + perf_session__delete(session); + return -1; + } + } + scripts_dir =3D fdopendir(scripts_dir_fd); if (!scripts_dir) { + close(scripts_dir_fd); perf_session__delete(session); return -1; } =20 - for_each_lang(scripts_path, scripts_dir, lang_dirent) { - scnprintf(lang_path, MAXPATHLEN, "%s/%s", scripts_path, - lang_dirent->d_name); + while ((lang_dirent =3D readdir(scripts_dir)) !=3D NULL) { + if (lang_dirent->d_type !=3D DT_DIR && + (lang_dirent->d_type =3D=3D DT_UNKNOWN && + !is_directory_at(scripts_dir_fd, lang_dirent->d_name))) + continue; + if (!strcmp(lang_dirent->d_name, ".") || !strcmp(lang_dirent->d_name, ".= .")) + continue; + #ifndef HAVE_LIBPERL_SUPPORT - if (strstr(lang_path, "perl")) + if (strstr(lang_dirent->d_name, "perl")) continue; #endif #ifndef HAVE_LIBPYTHON_SUPPORT - if (strstr(lang_path, "python")) + if (strstr(lang_dirent->d_name, "python")) continue; #endif =20 - lang_dir =3D opendir(lang_path); - if (!lang_dir) + lang_dir_fd =3D openat(scripts_dir_fd, lang_dirent->d_name, O_DIRECTORY); + if (lang_dir_fd =3D=3D -1) continue; - - for_each_script(lang_path, lang_dir, script_dirent) { + lang_dir =3D fdopendir(lang_dir_fd); + if (!lang_dir) { + close(lang_dir_fd); + continue; + } + while ((script_dirent =3D readdir(lang_dir)) !=3D NULL) { + if (script_dirent->d_type =3D=3D DT_DIR) + continue; + if (script_dirent->d_type =3D=3D DT_UNKNOWN && + is_directory_at(lang_dir_fd, script_dirent->d_name)) + continue; /* Skip those real time scripts: xxxtop.p[yl] */ if (strstr(script_dirent->d_name, "top.")) continue; if (i >=3D num) break; - snprintf(scripts_path_array[i], pathlen, "%s/%s", - lang_path, + scnprintf(scripts_path_array[i], pathlen, "%s/scripts/%s/%s", + exec_path, + lang_dirent->d_name, script_dirent->d_name); temp =3D strchr(script_dirent->d_name, '.'); snprintf(scripts_array[i], (temp - script_dirent->d_name) + 1, "%s", script_dirent->d_name); =20 - if (check_ev_match(lang_path, - scripts_array[i], session)) + if (check_ev_match(lang_dir_fd, scripts_array[i], session)) continue; =20 i++; diff --git a/tools/perf/util/path.c b/tools/perf/util/path.c index 00adf872bf00..9712466c51e2 100644 --- a/tools/perf/util/path.c +++ b/tools/perf/util/path.c @@ -68,6 +68,16 @@ bool is_directory(const char *base_path, const struct di= rent *dent) return S_ISDIR(st.st_mode); } =20 +bool is_directory_at(int dir_fd, const char *path) +{ + struct stat st; + + if (fstatat(dir_fd, path, &st, /*flags=3D*/0)) + return false; + + return S_ISDIR(st.st_mode); +} + bool is_executable_file(const char *base_path, const struct dirent *dent) { char path[PATH_MAX]; diff --git a/tools/perf/util/path.h b/tools/perf/util/path.h index d94902c22222..fbafbe7015dd 100644 --- a/tools/perf/util/path.h +++ b/tools/perf/util/path.h @@ -12,6 +12,7 @@ int path__join3(char *bf, size_t size, const char *path1,= const char *path2, con =20 bool is_regular_file(const char *file); bool is_directory(const char *base_path, const struct dirent *dent); +bool is_directory_at(int dir_fd, const char *path); bool is_executable_file(const char *base_path, const struct dirent *dent); =20 #endif /* _PERF_PATH_H */ --=20 2.47.0.338.g60cca15819-goog