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Thu, 16 Jul 2026 14:14:37 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 16 Jul 2026 14:14:37 +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 2/4] s390/mm: Fix handling of secure storage access exceptions in vmalloc area Date: Thu, 16 Jul 2026 16:14:34 +0200 Message-ID: <20260716141436.2125703-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260716141436.2125703-1-hca@linux.ibm.com> References: <20260716141436.2125703-1-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@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: AW1haW4tMjYwNzE2MDE0NiBTYWx0ZWRfXyV481t8lyfSS AJ8Oi3DbO0rHxVw1v4SRVjF7Bo2+CqAmnPYwEWoxY5zQ+/MkfEP/vEcm56Dn8G/gvUL8W/jAmKu k2LXouoNSS8r2zDpCku2szsIYZX3MbY= X-Authority-Analysis: v=2.4 cv=Mp1iLWae c=1 sm=1 tr=0 ts=6a58e752 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=aTeQ_7Lur19LOBhsqlcA:9 a=zZCYzV9kfG8A:10 X-Proofpoint-GUID: pNmcBO6XlsQVytgqcsMuecAP4QsBClyw X-Proofpoint-ORIG-GUID: pNmcBO6XlsQVytgqcsMuecAP4QsBClyw X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE2MDE0NiBTYWx0ZWRfX2nGAdLYpNUCE uY2MBuVEW+x3lWMqJTLiQn7KYLUgvKe3PpFAC7BdfXs6UxXp8WdG+Co9g3sLpTTVwaIZnwO85eC JHwAvFW200QVATkA/pis5bkXUov5cXA9tbFtrhMmDrdWx0insN82TtVUaQ4AlAdHh4PVR94R9ku 6zMa2BGzENyGqQpj6A6qDDlGNYWAzYxEYBxyn0g3ObPlPWK304s16vsXsT8G2+3/ksa8e0MV6gb fA7LuPHgV90aIa/S5CaP5OcgBtQxf81ps5QoJ+qJikfqm9A/6fS0A+Hj+nj+m9+u/+linnPFwHD 2VCMtArHAXkoG7y7zF2bU6MEOoSjuPQQYDZN2pB4zQYHktoZ0nfaTPf2biZxLMiIO9KLC/EzUg3 oZOEJofVg43owrtNKI7EqQtJ2i0/bUEgbHHl1nlsTv41eJsSsoMYjGzdo6oQzffthYjy/41Xd+j 7qCIl4vJ6L471EzjbVg== 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=2026-07-16_05,2026-07-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 bulkscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 suspectscore=0 clxscore=1011 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607160146 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