From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f201.google.com (mail-dy1-f201.google.com [74.125.82.201]) (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 6881C385D6A for ; Fri, 12 Jun 2026 18:10:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781287827; cv=none; b=pIr1dD0z8w1sCYxuv0s6FFSQrQx1rM5iXUCNxoMyMty4kG6NQRPQPvLHtxRbvhDE5JuQRcxyjOIFBm1zQU65YUZD71t5Cgp2FTFhzMvRZFipi2bmiS8XTfqIihTKBrNEdoPHBQH4UM+u1weii9lJdUJ8WGq1JzEpEawhFO79UZY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781287827; c=relaxed/simple; bh=qyK4fXvdu95AkC0VQJx5MW1zOkKVez0W+PT+CsRSyyY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=mi3Zwt7E8yZ+lummzY45XPfP16Z4YX9uF75nz3u9boZ7pQpkEXQBQBhx7PCinbwWklaURvGm91+4Uw0cc80St25KQ4R1pvoEvEm0wUFMYyFH1NNM7DSiK1fqCxmXBTdsh8tWLljPcC5+yJ2W7k/JldrNljtZvR2RFYM2CxxYM2c= 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=GCtzhL0H; arc=none smtp.client-ip=74.125.82.201 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="GCtzhL0H" Received: by mail-dy1-f201.google.com with SMTP id 5a478bee46e88-30762d67a64so1968420eec.0 for ; Fri, 12 Jun 2026 11:10:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781287823; x=1781892623; 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=Pky8TKVHcYMbaxaWIeiFp5Y+wCfhYAg3ppeOmUygJ94=; b=GCtzhL0HHEbSmmmZC+GoyUR6h27VTy30K+HSjWCkT+/kziAFxRxPp7SQ7jnxYHWh+1 w1XbaoeDagLoOT4K9eGNdyr2nmV1FxXMTWmUU+NKwbhlX8GFNAHZSCpHdKOueOhpvd08 GFw31U2H+FEXZFX4yZSXqBwBuCSv51IZNFWAkofCP7UijJNRs5+SYC0J/Yn26rJOKj9k sGrOkaa+OSvdMBinhRCJOa5anqLss7CUATRxhlpohR0Y++qeb1uXsqHYWEzeTJCqbzsL hBBsKhEQtGn8LQ4snEGQeTNUkA78N+uqf9puPVzWjms/NsNG0tvbiJxTQjHC0PEeNohT Rt5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781287823; x=1781892623; 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=Pky8TKVHcYMbaxaWIeiFp5Y+wCfhYAg3ppeOmUygJ94=; b=mVIL8/Y5DY6d7GG/aR0F9q+JzpSroapkIHwMGXx6Sgbz/IoXijVEHFJiyd/tUP+I0y wSmNRUQFOYc7n7b+vo2Vlm4NvVXTZwpVKtesI+0ToSa+XWTv+ny6wBlZuxQGPsqBQR3X lAQYc1xpdfOsz5+ciBZ7lIjVwpz+ktoLsoiL7d0iwTsUd5sWcHWGUa551gSrXvy7Wq7h HILqYgBdmtf3dslcFBC7dmaXt26Ss0QEo4rYjVUkK1MLdnEZwE5y6mEa/OeB1WhWMLyh RrYob69x67Da93Ok5Sll1AWvcFjevU6etoYWqZszyzh9ykGDtP4ORgjTQH8+9TUpIE2y pgaw== X-Forwarded-Encrypted: i=1; AFNElJ/wK5ejhfipsg1SAg9F6fKgj3cuf2Q9fnkm6Pt4bTx7jpfBc9ExFIBCYfQBjlobtFWtuFc/nxE+wcpjh1Aod+/F@vger.kernel.org X-Gm-Message-State: AOJu0Yw2KAaMLfNFlKjtTY4/fA0Xhx8jD6jqPCS3rl1sLQb9zAsFtpXu SM8x7hKy7ahgmmzulW0YM3QsAF/C2TUWe71AkRUzoDTXhxlkzHbd47V1PoEsAXG2+y2pYvL8b5d snvLR8VlYgA== X-Received: from dlae21.prod.google.com ([2002:a05:701b:2315:b0:12d:b2ba:b551]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:5707:b0:304:13f3:e461 with SMTP id 5a478bee46e88-3081ff3e004mr2454191eec.3.1781287822906; Fri, 12 Jun 2026 11:10:22 -0700 (PDT) Date: Fri, 12 Jun 2026 11:09:46 -0700 In-Reply-To: <20260612180956.1105352-1-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: <20260611224455.201994-1-irogers@google.com> <20260612180956.1105352-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260612180956.1105352-10-irogers@google.com> Subject: [PATCH v14 09/19] perf python: Add wrapper for perf_data file abstraction From: Ian Rogers To: irogers@google.com, acme@kernel.org, namhyung@kernel.org Cc: 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, 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 e9057536bf5e..bfd50f29049f 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" @@ -2460,6 +2462,121 @@ 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", @@ -2522,7 +2639,8 @@ 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. */ @@ -2570,6 +2688,9 @@ 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