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 689644C0420 for ; Thu, 11 Jun 2026 22:45:18 +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=1781217920; cv=none; b=NJ1WvXkevG9H6NOfOWKCQ/PSZEjLq5Udo79wCj6UuEnBHe9IQFTcUhFcrStbDT/jXvTa/ub8PftuKrAYgIdLuDmmFR/5eAM6qItD+0EcaEXnaY+FiJSUUJz+n2nPqQExV5XPjZ8OR2G9Mkrj5Hr3fSeussQbIb4T4xKWTuKGY9w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781217920; c=relaxed/simple; bh=jl+WG8kNwJ8YSROsIalx5WV3kP4NSWzelHAuzVDy1ac=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=OW33xAMmdoS1a57oFsVH082nS1/o3t4ZdflRKunLVmKHArcckyLNyBtnhs+wOX3x3IA2OwCEcSrTZId1xj9aCzhzeVxj5yQRFDughVVSJTbE+YNSZrv8KJBIhrmana6ZsIET9sLAPwZh3xEBHFUkAOLi/uvuBAewjS85/zJhc9A= 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=OWMCOMJt; 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="OWMCOMJt" Received: by mail-dy1-f202.google.com with SMTP id 5a478bee46e88-304d8613efbso543275eec.1 for ; Thu, 11 Jun 2026 15:45:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781217918; x=1781822718; 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=mqbtn4De/S875mcwmW2jgMrab1zwK638Kbdam+OH048=; b=OWMCOMJtz21NOMGRfdSDV9/OimUpL47uPmUgDZamvzdmfM0lWlUphgiOl66lynCH5/ jn0DV9j5ukYY8cHUD4SrOwdbkITVzN3b1IBSE+ijxkgX8uSZWE1pjtg/HSkNBd5bVvW2 tDf9Y1HbSjmMj6zNwAsKK3yTs1Nq9Jugw4a+rmrbIfqp30NfMBC8+Gde9XJOaGmE1ggo CoyZ8wVPgKBd6+dRPXuCTD5MQRuU4Q3CUpLVMWlH0AdGsACKA40viSt8fV+gGfScB0AR WN2v1gBblP/Ha1jabRzbEWIR78OidOImmQDPzCk8OoM10LJWW7sQArBiFPAuECawKlZF ya3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781217918; x=1781822718; 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=mqbtn4De/S875mcwmW2jgMrab1zwK638Kbdam+OH048=; b=BkO2Kc01wX5srlTTwCAQe8qoyEKimsiPLteA7hZb4k1ET8ipyqzMMVbXXOm045wwX9 +GkIs4nnz6hSHJ3bQJlbkp0bTIDO6M/8TQ7Z8phIqHCURIxqcdWzVW+elsRFIdyT8zjh J4VqzBDOGjw/G2knGJUETLMgWgWgJ6q43CgDSpRMwxRUb2HmMvT3fHAz8zigrXix4IdT nR2ACJvsidFbcOtoQxsXlOrVwYD6PFm+9f+NdpU4GpBSQg3ynvE9b0neQuFWSbJsIQ66 4p9+27GiatDetEykF+m3gvqzDjk8F6gOe9jSCgQJkKQwFiTiE+YQBrFRvsOnLr654unX Ebow== X-Forwarded-Encrypted: i=1; AFNElJ9wKYWm5jMt2rZCflbZV/S8cfdC3SQUMPGTZxjJym4qm1dGZDRAipgxMl5iaOs7ghj7JDLCXwrpO4AvOhUS72W/@vger.kernel.org X-Gm-Message-State: AOJu0YztqB0lU5ScZugLiCkZVwzLwoHEjaLiETxvnt2xEb8LQcK13s7g b7a6dGrNUGdNqP0arMdw6322AwF3w7DJf+ZFRuIsN2OAsKc/oGxpZVpOp/golKNe0D/9I5sL8uX 5MbQt6q0FYw== X-Received: from dydn14.prod.google.com ([2002:a05:7300:730e:b0:2f9:af7:5041]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:c9a:b0:304:bce9:25fa with SMTP id 5a478bee46e88-3081ff41296mr201796eec.4.1781217917318; Thu, 11 Jun 2026 15:45:17 -0700 (PDT) Date: Thu, 11 Jun 2026 15:44:45 -0700 In-Reply-To: <20260611224455.201994-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260611171756.4008769-1-irogers@google.com> <20260611224455.201994-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260611224455.201994-10-irogers@google.com> Subject: [PATCH v13 09/19] perf python: Add wrapper for perf_data file abstraction From: Ian Rogers To: irogers@google.com Cc: acme@kernel.org, adrian.hunter@intel.com, alice.mei.rogers@gmail.com, dapeng1.mi@linux.intel.com, james.clark@linaro.org, leo.yan@linux.dev, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, tmricht@linux.ibm.com 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 | 123 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 122 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c index 669b65ce3f3d..c86b9713c076 100644 --- a/tools/perf/util/python.c +++ b/tools/perf/util/python.c @@ -6,6 +6,7 @@ #include #include +#include #include #include @@ -14,6 +15,7 @@ #include "callchain.h" #include "counts.h" +#include "data.h" #include "event.h" #include "evlist.h" #include "evsel.h" @@ -2455,6 +2457,121 @@ 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); + pdata->data.path = NULL; + + 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"); + return -1; + } + if (!path) + path = "-"; + else if (strcmp(path, "-") != 0) { + PyErr_SetString(PyExc_ValueError, + "path must be '-' when fd is provided"); + return -1; + } + fd = dup(fd); + if (fd < 0) { + PyErr_SetFromErrno(PyExc_OSError); + return -1; + } + } else if (path && strcmp(path, "-") == 0) { + fd = dup(0); + if (fd < 0) { + PyErr_SetFromErrno(PyExc_OSError); + return -1; + } + } + + if (!path) + path = "perf.data"; + + pdata->data.path = strdup(path); + if (!pdata->data.path) { + if (fd != -1) + close(fd); + PyErr_NoMemory(); + 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", @@ -2517,7 +2634,8 @@ 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. */ @@ -2565,6 +2683,9 @@ 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; -- 2.54.0.1136.gdb2ca164c4-goog