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Fri, 17 Jul 2026 09:24:16 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 17 Jul 2026 09:24:16 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , David Hildenbrand Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/4] s390/mm: Fix handling of secure storage access exceptions in vmalloc area Date: Fri, 17 Jul 2026 11:24:13 +0200 Message-ID: <20260717092415.3039699-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260717092415.3039699-1-hca@linux.ibm.com> References: <20260717092415.3039699-1-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE3MDA5MSBTYWx0ZWRfX85BykstiHoKa HJO9tpR/zq4uXW+K2GuDAKd2NaBTZd52PPK7nwt2wlNm+RH7scoXIKCVLpJvix/ukVJdJBXDpXT 1O/O+t6lIjqrZkqS/REr8nFx90n4RxY= X-Proofpoint-GUID: lgjFNo-D_Y4_JVRKUZHxEgCzcpLsLOZK X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE3MDA5MSBTYWx0ZWRfX5CGwNEbikdxb DfB5eX4l+3W8peS2fNJTJh9yMwVF+4wkW/IDQIAJRR1JM+D8lBRn7o4cRFZVFJdO1s2EeVJVd+e tcTP11Og6uCdnOemNL/nZ9Ha7mG3wWT5U/Vv9bGKlKH7Tsmdp+y6aXEpOdvZSX3aLvuRIdiYWoY OgX721PyLM8NsaPQPI+HyBwY9tu4+uJPmB4KHuIZJOLr0ACBwko74LUkWc+5DY/8UsHsdrMIrrR lg8I0YWhxg1WMYxjoYvE5Ou7IfVsuIHpc2es02FecfTTK0QL6RkBirpnZVopvRtRAIevRsiI2Z9 aKactX+o3UNubjjteVJvL1fyxrNM6zhMDecR06gpxd8W1Jem4B18gTs+irXV/ViRokh1o3VtFB1 GjyH9T7TWRi5voX65vto5nR7Y8TcLXiykdJV4z5u6Kk3trt44j4xK2w2sh2ObbpPOL2NDQ/nXqt vX+ImTCIkfvgtjRkFlQ== X-Proofpoint-ORIG-GUID: lgjFNo-D_Y4_JVRKUZHxEgCzcpLsLOZK X-Authority-Analysis: v=2.4 cv=PvajqQM3 c=1 sm=1 tr=0 ts=6a59f4c5 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=aTeQ_7Lur19LOBhsqlcA:9 a=zZCYzV9kfG8A:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-17_02,2026-07-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 bulkscore=0 impostorscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 spamscore=0 suspectscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607170091 Secure storage access exceptions in vmalloc area need to be handled separately since folio_try_get() or virt_to_phys() do not work on such addresses. Given that there cannot be a valid access let such exceptions fail immediately. The kernel will either fixup or crash. Signed-off-by: Heiko Carstens --- arch/s390/mm/fault.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 028aeb9c48d6..392e46742039 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -438,6 +438,8 @@ void do_secure_storage_access(struct pt_regs *regs) panic("Unexpected PGM 0x3d with TEID bit 61=0"); } if (is_kernel_fault(regs)) { + if (is_vmalloc_addr((void *)addr)) + return handle_fault_error_nolock(regs, 0); folio = virt_to_folio((void *)addr); if (unlikely(!folio_try_get(folio))) return; -- 2.53.0