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Mon, 20 Jul 2026 08:58:35 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 20 Jul 2026 08:58:35 +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 v4 4/8] s390/mm: Fix handling of vmalloc area in do_secure_storage_access() Date: Mon, 20 Jul 2026 10:58:30 +0200 Message-ID: <20260720085834.898025-5-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260720085834.898025-1-hca@linux.ibm.com> References: <20260720085834.898025-1-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-ORIG-GUID: Ii27NQZkLbIc3OV6nmq6aVacUYtbZdbs X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIwMDA5NiBTYWx0ZWRfX0ObMi2BZ33oT 7KUJsxGnRwR5w6kclFyiLKiqSeTYaq3f9OkBiYIp3qXxB/nCFWiWhFrDyCvK0gpujezw6BTfEXb eN8fHYPMNoVoq2a8zwPVyzqBU0Nr0OBSzBVjm3BBtS8NBq88GriLrlTqOUWj+peVC83yl+ST18X UPEotqAh4bf075wvkVeXckxleKWuzvLom5HWzeEAlvQ2U4OabqMU3hVAeJGfMFv+Y1ajKsvPGn+ COuI983tNfY0v5pviXReRmGfkuuYj+bFk9sMlHhnRTrSP/AzgrBbWO0MOu1sRy4MtrUQ9EW9M/v G1SHBKJjtIQvgM0yzAx8f2Ots5e4dA+69VOwVDJ/I9RrwE2EYcPy+c8YX7EmCa+GDRfSg4Ssb50 EcdpxaHK6sTDkmi4wotBMu2G6FojSByCklxdVa2Ui0sZpN6ua3wjQwDLVIY1J+0nouhk6hlBzCX Ejkty0LLUSUfkcLvhaQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIwMDA5NiBTYWx0ZWRfX4zDbmKDKoBT/ +H2CDvzun3y/tzcOo93tzQ8iMjt97pZ0rS5yzV5VWruCE6m4BOoYH2CNu127/wzjEsXxJoRXkW+ oj51cZJ9IAybc7w+bUdePyvKAOsTJTg= X-Proofpoint-GUID: Ii27NQZkLbIc3OV6nmq6aVacUYtbZdbs X-Authority-Analysis: v=2.4 cv=SM5ykuvH c=1 sm=1 tr=0 ts=6a5de340 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p: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=2026-07-20_01,2026-07-17_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 priorityscore=1501 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607200096 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. Tested-by: Christian Borntraeger 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 f150d97cac2e..e650cdfa2523 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