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Wed, 12 Aug 2026 15:55:30 +0000 (GMT) Received: from [127.0.1.1] (unknown [9.87.85.9]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 12 Aug 2026 15:55:30 +0000 (GMT) From: Steffen Eiden Date: Wed, 12 Aug 2026 17:55:20 +0200 Subject: [PATCH v3 2/2] s390/uv: Prevent potential out-of-bounds read Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260812-uv_secrets_fix-v3-2-a85bd29e0666@linux.ibm.com> References: <20260812-uv_secrets_fix-v3-0-a85bd29e0666@linux.ibm.com> In-Reply-To: <20260812-uv_secrets_fix-v3-0-a85bd29e0666@linux.ibm.com> To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda Cc: David Hildenbrand , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle , Christoph Schlameuss , Harald Freudenberger , Steffen Eiden , kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.3 X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODEyMDEyNiBTYWx0ZWRfX4Tmyso7ugs3q mJaGHdbbJ1K71SlrWc2+yxg+4IrMseEVogYdJwAef2YpCgh/J1ROzJlGx59kKEvG97ZhSjjzvEA AYXVTMqWK7cZ+0asR+xp6YEbwzT8ps/Wnf3Tv/QnXHx28jHCJnjpBM/4cQmF69X2KV9GBozZIw5 SRafvB8SBToqN16C7D67Q3QbWBUfSHwo6MuZDdNYlrsO6tn0n1Gk2elh5tvC9gdEBEh2bkKNRBY +rMv4ZAsHG29VQSgYFAbgml0nvCJwDybY+yhYTDBEnDosmw1Tniahf791Uxghn+wYhMYq2UpcSK 8XS/rdiOm7sAifBkW2MGQ6TQnmB7vSqL4hL9R6dNFvSREt6XKu/QBsdK0TodxavXIP4lFqP9jEy UfWj5j3aT4JFPbxQo3kWPO92SZHxFZlEcbt1EHlvX5fd//jY6lVSJ2hIV3mn8JSSl5heRZgkvRX yxDa8x2kV4IPmGwpWVg== X-Proofpoint-ORIG-GUID: kyj0If_SH5d2-A-EfrcLljjZwh5z8KWq X-Proofpoint-Spam-Info: AW1haW4tMjYwODEyMDEyNiBTYWx0ZWRfX+YCxzgXO1kSG ilS2lG5Zhs1q8QAGDoObhewIwmJzxVHXfVcqCNKlsOqk6lZIu/wBwUHmn+SWekHOXE+SDzxh6sJ 6CSJ2JReUyHpEhs1BhCYCknV1Qxuq1U= X-Authority-Analysis: v=2.4 cv=IfK3n2qa c=1 sm=1 tr=0 ts=6a7c9778 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=25poj8ZeXyvPz4Svze8A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: kyj0If_SH5d2-A-EfrcLljjZwh5z8KWq 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=2026-08-12_04,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 malwarescore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608120126 When the system has more than 85 secrets, the uv_secret_list struct array only holds up to 85 items per page, resulting in an out of bounds read in find_secret_in_page if the targeted secret is in the next page or not stored at all. Fix this by looping over the number of stored secrets which is the per sub-list count of stored secrets and not the overall count. Fixes: 7c9137af2042 ("s390/uv: Retrieve UV secrets support") Signed-off-by: Steffen Eiden --- arch/s390/kernel/uv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index d970b15ef126..e70acad09cd5 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -760,7 +760,7 @@ static int find_secret_in_page(const u8 secret_id[UV_SECRET_ID_LEN], { u16 i; - for (i = 0; i < list->total_num_secrets; i++) { + for (i = 0; i < list->num_secr_stored; i++) { if (memcmp(secret_id, list->secrets[i].id, UV_SECRET_ID_LEN) == 0) { *secret = list->secrets[i].hdr; return 0; -- 2.53.0