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Tue, 29 Sep 2026 07:59:11 +0000 (GMT) Received: from [9.111.133.97] (unknown [9.111.133.97]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 29 Sep 2026 07:59:11 +0000 (GMT) Message-ID: Date: Tue, 29 Sep 2026 09:59:11 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net v2] s390/ism: Zerorize dmb at allocation To: netdev-bot+sinfo@kernel.org Cc: Aswin Karuvally , Gerd Bayer , David Miller , Jakub Kicinski , Paolo Abeni , Eric Dumazet , Andrew Lunn , Julian Ruess , netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Simon Horman , stable@vger.kernel.org References: <20260928151420.383105-1-wintera@linux.ibm.com> <179060878011.31693.9560616938197921438@kernel.org> Content-Language: en-US From: Alexandra Winter In-Reply-To: <179060878011.31693.9560616938197921438@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: Dq6oxlTlGgjWbDKUF6Laq3E-DEFTiGtJ X-Proofpoint-GUID: LX339yYhOmkuhCuHNvupgdyJPLuVlVi2 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI5MDAzMCBTYWx0ZWRfX47Pt4eTPiKPy k/EjrQWQ5DFOE5LGiGPiwvninrOXwRGSXCRjqFH3lXuFu0a5sA61VN0ZmmrxhVxKCSaUkvNB/r1 jRKqPFCslJ9CeFSoCHuXhIgKFQlWiro= X-Authority-Analysis: v=2.4 cv=Vv62kO2n c=1 sm=1 tr=0 ts=6abb6fd6 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=xiR1IYxcKOTdaxYgfMsA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI5MDAzMCBTYWx0ZWRfX0pt70fkGDxW7 XXk7PMNpleH0FxCYJPO0P3hb1eC0nmUm9xoKCOByjBW2UA6MpCxo6CFVqmZfwCghNpXzuZsQpcB 1KQtp/fNXINRc2DHeuyHMFydoeQpxCDxVy91xxub3VqE6iwUzhDQlgR1CL8ypCR08h/xhlGEo+c fl7/RA+8pK4S43FOPx4s0c7XWymbeZXiUnKFTT6SqXjKf7GEnCxHPd6guMij9pzZm00n8iywLD9 O82L692RZrKzuWWW6T9Og5nS3hffGowxRuaOEo7HmWHdzwNL5E0n29B1psYjoi2+qxUp29t4nOE bnKoXiwivQzgDUMEYOz1kqbL/+ulUCg2k++HOs7AaH/0KWGgXeW3er8Gsve66n7+0fV6WWaBrrv fG2f5dEpGICanDZWcSod4Pf3QSErX0ajVjHP5FL34DDf1w5r5X7idTHxc60CNUb43heQCbX7TXR 7rOZ1wOTQTVYOmAYEEg== 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=2026-09-29_03,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 adultscore=0 priorityscore=1501 malwarescore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609290030 On 28.09.26 17:19, netdev-bot+sinfo@kernel.org wrote: > Hi! > > This is an automated message. This series looks like a fix, but its > commit messages seem to be missing some information: > > - Whether the issue was actually triggered, or is only theoretical > (e.g. found by code inspection). If it was triggered please include > the symptoms, like the stack trace or error messages. > > Please do not repost the series just to address the above. Instead, > reply to this email with the missing information, so that reviewers > can take it into account. If the series needs another revision for > other reasons, please include the information in the commit messages > then. > > The evaluation is done by an LLM so it may be wrong, if you think > that is the case please reply and explain. For reference: On 28.09.26 17:14, Alexandra Winter wrote: > Sashiko reported [1] that 'Missing __GFP_ZERO in folio_alloc() causes > uninitialized kernel memory to be exposed in the receive message buffer'. > An ism dmb is receive-only, so the data is not leaked to a remote peer. In > general the smc kernel module (dibs client) will only push newly received > data to userspace. We still should not have uninitialized data in a receive > buffer. As mentioned in the commit message this issue was reported by Sashiko and found valid by me. I do not see a simple reproducer. Alexandra