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Fri, 21 Aug 2026 19:41:36 +0000 (GMT) Received: from [9.111.132.173] (unknown [9.111.132.173]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 21 Aug 2026 19:41:36 +0000 (GMT) Message-ID: <619b30bc-629f-4a69-908f-18e7d6e1b318@linux.ibm.com> Date: Fri, 21 Aug 2026 21:41:36 +0200 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Jens Remus Subject: Re: [RFC PATCH v1 17/25] unwind_user/eh_frame: Ignore DW_CFA_GNU_args_size To: sashiko-reviews@lists.linux.dev Cc: Heiko Carstens , Vasily Gorbik , linux-s390@vger.kernel.org, Alexander Gordeev , Christian Borntraeger , linux-trace-kernel@vger.kernel.org References: <20260818144954.2320378-1-jremus@linux.ibm.com> <20260818144954.2320378-18-jremus@linux.ibm.com> <20260818150448.31B4C1F000E9@smtp.kernel.org> Content-Language: en-US Organization: IBM Deutschland Research & Development GmbH In-Reply-To: <20260818150448.31B4C1F000E9@smtp.kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=AdqB2XXG c=1 sm=1 tr=0 ts=6a88a9f6 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=VwQbUJbxAAAA:8 a=70T5dO4TaAuPqYxvtj4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: 8lOPie1xGfRvxoDnCUnHAaa03aYEJ6VO X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIxMDE1NSBTYWx0ZWRfX1k9uw3otbBTW 0djsIzG694zAEMVMMpdAjNbUqTThuW4J00kdybXu7o96T05vV7qACkN+qjDZUdMSombBz8WeZuR 9/g02mcHbGA9fyfZmhxehI2xeV6u9C8VJBU56xxfty/nvs3up0I6wxqyExVYXO/cfyQNwNklXqh ycoDS/l3CHi5hryFfiRkTpNJs9wGMbIi9WjoTvQC7Z5wc9UI59w1L7OB5VoRm/v27SbZMugPWso tqeB9RPtnSHnwmtIiC4cymwuWa5OQ0cmGHLstQoVP5isGh0JLhF4rM9nUxltx0M1d3RB8LQRhEO 5NzRYQoZRqNoTll03qUfe2VaAEO88kYdPndxwl0wT9LyIQRdOgdBsbPZFoEe+082sZ7L048iIs7 LQSM1uGSvO7NJTzWDqZwW4ZrjsiWv/8Ggvv2/PxXrEhm27puG6DH/3Hxj54DhuFSIiUNmIcyQ7D 5Wavo8KwNckfNF6wLJQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwODIxMDE1NSBTYWx0ZWRfX0p8XBgRqpAwF r8OhDutOnZd5KURbAhRrirW/8GahFF6wbu/QNBJowYjOBz6x9BJ2vfCrtYONKIFLNK8Hz0cfTsb tJ86uhcn0FSaO08shvfB38U/5uByRMU= X-Proofpoint-ORIG-GUID: 8lOPie1xGfRvxoDnCUnHAaa03aYEJ6VO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-21_06,2026-08-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 suspectscore=0 malwarescore=0 impostorscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608210155 On 8/18/2026 5:04 PM, sashiko-bot@kernel.org wrote: > Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider: > > Pre-existing issues: > - [High] An integer overflow when evaluating `cur + expr_len` bypasses bounds checks, allowing an attacker to move the instruction pointer backward and trap the kernel in an infinite loop. > - [High] The CFI interpreter loop does not impose a maximum execution limit, allowing an attacker to stall the CPU by providing a maliciously crafted, highly padded sequence of CFI instructions. Will address in respective patches in next version. Regards, Jens -- Jens Remus Linux on Z Development (D3303) jremus@de.ibm.com / jremus@linux.ibm.com IBM Deutschland Research & Development GmbH; Vorsitzender des Aufsichtsrats: Wolfgang Wendt; Geschäftsführung: David Faller; Sitz der Gesellschaft: Ehningen; Registergericht: Amtsgericht Stuttgart, HRB 243294 IBM Data Privacy Statement: https://www.ibm.com/privacy/