From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f202.google.com (mail-dy1-f202.google.com [74.125.82.202]) (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 E7E1A38E126 for ; Sat, 25 Apr 2026 22:42:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777156922; cv=none; b=f8KnpDJwfdRzvn1p5nj3aelEUpPj5R3JIMgextXo8zYOa6eBXj/FA1Ukb2i3SSAl2pg8YL0M53PYk4C+bpdTT7grQ17KQyOBEmybhK999ODsQ04jPjeOtCf3ab78FmazqT3BYpee3x/s6aQCcqFU4phHp83p2KLo179B8gmFi84= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777156922; c=relaxed/simple; bh=zQJJTQ7WIIRdlqmfoLZApYom+sX71HVjnn5QQIJluZY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=QjVtN0w06xSYJh+qCsm2IeysZqR+cydV0ntSCa2Z9M6b0gStj3REhlUka5qykzzvXHZ+eIt9FR9NOipyURbbHCZiXWqETQOWnDS4fY7ijMBBbP802v73nR0Izv85KKbIMjKWS6gd4VBBHBCf7KehZ6KxKnkoiSOX3pqegCJOKKU= 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=llVqX3Dl; arc=none smtp.client-ip=74.125.82.202 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="llVqX3Dl" Received: by mail-dy1-f202.google.com with SMTP id 5a478bee46e88-2e60238adb1so21608894eec.0 for ; Sat, 25 Apr 2026 15:42:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777156920; x=1777761720; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=9169CYggYX8a+HEsC3bSJNy6IomTsX+Hp0FHeVzozsY=; b=llVqX3DlX5TtPY2+8eIb24fTkZ//24JUFHONlBlXzC8eUUtwSz4bxu/V8wbVexZHFd c/CBGeCEkr8mtWP/xMm7ZHu3hmFYeBs4mdbZr2FdS7WxLpHzJpzejOk8s+p8vAoYA8p3 +L6OMJRnx92rmsQc7RlzRhvDnBRYuMh8eZ1C5H7x5yl3eYGBq/Z3Kj7rgf7GajjSKv5D 2ShKO5qRfi1CaYrOOGXBESdGstAVefKQDreWIZSUEByws4cMJycl2UBkZ8WK3hM1xkMY VcvU0i3ACePSeLOv2EDBXbXLzb/JDlS8oRvtio0ze+jGM0m0SAIlQwKHUeaEyjyH4Yla lmfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777156920; x=1777761720; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=9169CYggYX8a+HEsC3bSJNy6IomTsX+Hp0FHeVzozsY=; b=iqOkt5rJla7PjwyGTRL+C01SGhgDfBmV1UjcMYqaAvYhL+d0BZRSx4EowcS9Eusq03 Bb/KJ3WzvXbN2REzwnq8sFUcKrHe3wA7LvHPdFux+FMGrQW8nXE4i3oVxVfFCg6HBdl8 f6u5TE6xEjXOglaYe+GptlTM6i+BPPt0thPcyINh4vT6fM7wKWaEt15uRgWM3cf8bS2A soP2FqliNEB8t+zleho9gAR/wCyTLbcGCiLPyorPNwkmlXcV4rpUJesjZyiJPYBZ8qbs 05eA8Lk8NfGh66p1sBN1Qf6sjcBjetw+DD3L8bipPjiGTZ88hr9C0D9gzhx77KmA9DsV ivaA== X-Forwarded-Encrypted: i=1; AFNElJ/JZlaGPKKPPaieNkKmY0ppxQN9hwByZnidGOjr+nuWGtfv5LFeSSUnKAx6mu4S0W5x2vzA+SJnY/ovgpU=@vger.kernel.org X-Gm-Message-State: AOJu0YwpHb6mJLUSdN8wgrbHblb9pQtpuHLmZtTGWwPPOSzmRqSIHPv2 EggiqJRfGBBjQR6bFjFgh+wuICvYOaPXRRLJtdR3yxyOppsiNTTQwnnX2Bx9Uz5Bw3C7A0bEmJC hRHrcoDlGHA== X-Received: from dybkz15.prod.google.com ([2002:a05:7301:1a0f:b0:2d9:cb4f:864d]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7301:3d17:b0:2dd:405f:89b3 with SMTP id 5a478bee46e88-2e4528ce85cmr21073178eec.0.1777156919870; Sat, 25 Apr 2026 15:41:59 -0700 (PDT) Date: Sat, 25 Apr 2026 15:40:39 -0700 In-Reply-To: <20260425224125.160890-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260425174858.3922152-1-irogers@google.com> <20260425224125.160890-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260425224125.160890-15-irogers@google.com> Subject: [PATCH v7 14/59] perf python: Add wrapper for perf_data file abstraction From: Ian Rogers To: acme@kernel.org, adrian.hunter@intel.com, james.clark@linaro.org, leo.yan@linux.dev, namhyung@kernel.org, tmricht@linux.ibm.com Cc: alice.mei.rogers@gmail.com, dapeng1.mi@linux.intel.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, Ian Rogers Content-Type: text/plain; charset="UTF-8" The perf_data struct is needed for session supported. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- v2: 1. Fixed Memory & FD Leaks in pyrf_data__init : Added cleanup of old state (closing file and freeing path) if __init__ is called multiple times on the same object. 2. Fixed Invalid Free in pyrf_data__delete : Ensured pdata->data.path is always dynamically allocated via strdup() , even for the default "perf.data" . This avoids passing a static string literal to free(). 3. Fixed NULL Pointer Dereference in pyrf_data__str : Added a check for NULL path to prevent segfaults if str() or repr() is called on an uninitialized object. 4. Guarded fd Argument Usage: Added a check to ensure that if an fd is provided, it corresponds to a pipe, failing gracefully with a ValueError otherwise. v7: - Added pyrf_data__new to zero-initialize pdata->data to fix crash on re-initialization. --- tools/perf/util/python.c | 103 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 102 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c index 2ba3556c4f16..aa63c7ffe822 100644 --- a/tools/perf/util/python.c +++ b/tools/perf/util/python.c @@ -10,6 +10,7 @@ #include "callchain.h" #include "counts.h" +#include "data.h" #include "event.h" #include "evlist.h" #include "evsel.h" @@ -2316,6 +2317,102 @@ static PyObject *pyrf__metrics(PyObject *self, PyObject *args) return list; } +struct pyrf_data { + PyObject_HEAD + + struct perf_data data; +}; + +static int pyrf_data__init(struct pyrf_data *pdata, PyObject *args, PyObject *kwargs) +{ + static char *kwlist[] = { "path", "fd", NULL }; + char *path = NULL; + int fd = -1; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|si", kwlist, &path, &fd)) + return -1; + + if (pdata->data.open) + perf_data__close(&pdata->data); + free((char *)pdata->data.path); + + if (!path) + path = "perf.data"; + + pdata->data.path = strdup(path); + if (!pdata->data.path) { + PyErr_NoMemory(); + return -1; + } + + if (fd != -1) { + struct stat st; + + if (fstat(fd, &st) < 0 || !S_ISFIFO(st.st_mode)) { + PyErr_SetString(PyExc_ValueError, + "fd argument is only supported for pipes"); + free((char *)pdata->data.path); + pdata->data.path = NULL; + return -1; + } + } + + pdata->data.mode = PERF_DATA_MODE_READ; + pdata->data.file.fd = fd; + if (perf_data__open(&pdata->data) < 0) { + PyErr_Format(PyExc_IOError, "Failed to open perf data: %s", + pdata->data.path ? pdata->data.path : "perf.data"); + return -1; + } + return 0; +} + +static void pyrf_data__delete(struct pyrf_data *pdata) +{ + perf_data__close(&pdata->data); + free((char *)pdata->data.path); + Py_TYPE(pdata)->tp_free((PyObject *)pdata); +} + +static PyObject *pyrf_data__str(PyObject *self) +{ + const struct pyrf_data *pdata = (const struct pyrf_data *)self; + + if (!pdata->data.path) + return PyUnicode_FromString("[uninitialized]"); + return PyUnicode_FromString(pdata->data.path); +} + +static PyObject *pyrf_data__new(PyTypeObject *type, PyObject *args, PyObject *kwargs) +{ + struct pyrf_data *pdata; + + pdata = (struct pyrf_data *)PyType_GenericNew(type, args, kwargs); + if (pdata) + memset(&pdata->data, 0, sizeof(pdata->data)); + return (PyObject *)pdata; +} + +static const char pyrf_data__doc[] = PyDoc_STR("perf data file object."); + +static PyTypeObject pyrf_data__type = { + PyVarObject_HEAD_INIT(NULL, 0) + .tp_name = "perf.data", + .tp_basicsize = sizeof(struct pyrf_data), + .tp_dealloc = (destructor)pyrf_data__delete, + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_doc = pyrf_data__doc, + .tp_init = (initproc)pyrf_data__init, + .tp_repr = pyrf_data__str, + .tp_str = pyrf_data__str, +}; + +static int pyrf_data__setup_types(void) +{ + pyrf_data__type.tp_new = pyrf_data__new; + return PyType_Ready(&pyrf_data__type); +} + static PyMethodDef perf__methods[] = { { .ml_name = "metrics", @@ -2378,7 +2475,8 @@ PyMODINIT_FUNC PyInit_perf(void) pyrf_cpu_map__setup_types() < 0 || pyrf_pmu_iterator__setup_types() < 0 || pyrf_pmu__setup_types() < 0 || - pyrf_counts_values__setup_types() < 0) + pyrf_counts_values__setup_types() < 0 || + pyrf_data__setup_types() < 0) return module; /* The page_size is placed in util object. */ @@ -2426,6 +2524,9 @@ PyMODINIT_FUNC PyInit_perf(void) Py_INCREF(&pyrf_counts_values__type); PyModule_AddObject(module, "counts_values", (PyObject *)&pyrf_counts_values__type); + Py_INCREF(&pyrf_data__type); + PyModule_AddObject(module, "data", (PyObject *)&pyrf_data__type); + dict = PyModule_GetDict(module); if (dict == NULL) goto error; -- 2.54.0.545.g6539524ca2-goog