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Tue, 21 Feb 2023 09:01:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ynddal.dk; s=sig1; t=1676970083; bh=vp5ym4NBeJNJFGZweQnKwCeUJEJUDAEMOCLifdsfR+8=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=E+j373L5sR3v15DG7QaR2pE74/Kwf1298EMaNGuMR44IOOMbh5nmEStgmjuFemnuV DKmDdXP75LLdz8KXPD7gF7j83XeDCeoNXHTfFkD1iZD7DCEgDhIMGRTZSmj6w+aKxm erwsarHOB8X6RhymtJ8Z+U5TzrcC70d2REMlGGDi47UUzLkb+Pk1KxY8dDH7Ua9mTp 5sR8U+RcZecYEPDRmfSwMRnJYD6pLhBTSR/6j4emNfOOh4YHsZQg+gmpjMxvyricJ9 l8S4SwWaFt6qbjem0PKnrqDsAfcYWE4murysoOCLER1Sl+3gijhnxiXw43cECOY9G/ mthK7yo09LXGw== From: Mads Ynddal To: qemu-devel@nongnu.org Cc: John Snow , Stefan Hajnoczi , Cleber Rosa , Mads Ynddal Subject: [PATCH 7/9] simpletrace: Improved error handling on struct unpack Date: Tue, 21 Feb 2023 10:01:02 +0100 Message-Id: <20230221090104.86103-8-mads@ynddal.dk> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230221090104.86103-1-mads@ynddal.dk> References: <20230221090104.86103-1-mads@ynddal.dk> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: KDvqjn--q-Rw9dGnDqRtNbl-2EV__hOQ X-Proofpoint-GUID: KDvqjn--q-Rw9dGnDqRtNbl-2EV__hOQ X-Proofpoint-Virus-Version: =?UTF-8?Q?vendor=3Dfsecure_engine=3D1.1.170-22c6f66c430a71ce266a39bfe25bc?= =?UTF-8?Q?2903e8d5c8f:6.0.425,18.0.816,17.0.605.474.0000000_definitions?= =?UTF-8?Q?=3D2022-01-18=5F01:2022-01-14=5F01,2022-01-18=5F01,2020-01-23?= =?UTF-8?Q?=5F02_signatures=3D0?= X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=422 phishscore=0 adultscore=0 spamscore=0 clxscore=1030 bulkscore=0 mlxscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2302210078 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=17.58.23.181; envelope-from=mads@ynddal.dk; helo=mr85p00im-ztdg06011201.me.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ynddal.dk) X-ZM-MESSAGEID: 1676970279898100001 Content-Type: text/plain; charset="utf-8" From: Mads Ynddal A failed call to `read_header` wouldn't be handled the same for the two different code paths (one path would try to use `None` as a list). Changed to raise exception to be handled centrally. This also allows for easier unpacking, as errors has been filtered out. Signed-off-by: Mads Ynddal --- scripts/simpletrace.py | 41 ++++++++++++++++------------------------- 1 file changed, 16 insertions(+), 25 deletions(-) diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py index df52b09dbc..61af68618f 100755 --- a/scripts/simpletrace.py +++ b/scripts/simpletrace.py @@ -30,26 +30,24 @@ def read_header(fobj, hfmt): hlen =3D struct.calcsize(hfmt) hdr =3D fobj.read(hlen) if len(hdr) !=3D hlen: - return None + raise ValueError('Error reading header. Wrong filetype provided?') return struct.unpack(hfmt, hdr) =20 def get_record(event_mapping, event_id_to_name, rechdr, fobj): """Deserialize a trace record from a file into a tuple (name, timestamp, pid, arg1, ..., arg6).""" - if rechdr is None: - return None - if rechdr[0] !=3D dropped_event_id: - event_id =3D rechdr[0] + event_id, timestamp_ns, length, pid =3D rechdr + if event_id !=3D dropped_event_id: name =3D event_id_to_name[event_id] - rec =3D (name, rechdr[1], rechdr[3]) try: event =3D event_mapping[name] except KeyError as e: - sys.stderr.write('%s event is logged but is not declared ' \ + sys.stderr.write(f'{e} event is logged but is not declared ' \ 'in the trace events file, try using ' \ - 'trace-events-all instead.\n' % str(e)) + 'trace-events-all instead.\n') sys.exit(1) =20 + rec =3D (name, timestamp_ns, pid) for type, name in event.args: if is_string(type): l =3D fobj.read(4) @@ -60,9 +58,8 @@ def get_record(event_mapping, event_id_to_name, rechdr, f= obj): (value,) =3D struct.unpack('=3DQ', fobj.read(8)) rec =3D rec + (value,) else: - rec =3D ("dropped", rechdr[1], rechdr[3]) - (value,) =3D struct.unpack('=3DQ', fobj.read(8)) - rec =3D rec + (value,) + (dropped_count,) =3D struct.unpack('=3DQ', fobj.read(8)) + rec =3D ("dropped", timestamp_ns, pid, dropped_count) return rec =20 def get_mapping(fobj): @@ -79,22 +76,16 @@ def read_record(event_mapping, event_id_to_name, fobj): =20 def read_trace_header(fobj): """Read and verify trace file header""" - header =3D read_header(fobj, log_header_fmt) - if header is None: - raise ValueError('Not a valid trace file!') - if header[0] !=3D header_event_id: - raise ValueError('Not a valid trace file, header id %d !=3D %d' % - (header[0], header_event_id)) - if header[1] !=3D header_magic: - raise ValueError('Not a valid trace file, header magic %d !=3D %d'= % - (header[1], header_magic)) - - log_version =3D header[2] + _header_event_id, _header_magic, log_version =3D read_header(fobj, log= _header_fmt) + if _header_event_id !=3D header_event_id: + raise ValueError(f'Not a valid trace file, header id {_header_even= t_id} !=3D {header_event_id}') + if _header_magic !=3D header_magic: + raise ValueError(f'Not a valid trace file, header magic {_header_m= agic} !=3D {header_magic}') + if log_version not in [0, 2, 3, 4]: - raise ValueError('Unknown version of tracelog format!') + raise ValueError(f'Unknown version {log_version} of tracelog forma= t!') if log_version !=3D 4: - raise ValueError('Log format %d not supported with this QEMU relea= se!' - % log_version) + raise ValueError(f'Log format {log_version} not supported with thi= s QEMU release!') =20 def read_trace_records(event_mapping, event_id_to_name, fobj): """Deserialize trace records from a file, yielding record tuples (even= t_num, timestamp, pid, arg1, ..., arg6). --=20 2.38.1