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Fri, 2 Oct 2026 08:59:22 +0000 (GMT) Received: from osiris (unknown [9.111.12.77]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTPS; Fri, 2 Oct 2026 08:59:22 +0000 (GMT) Date: Fri, 2 Oct 2026 10:59:21 +0200 From: Heiko Carstens To: Heiko Carstens Cc: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: Re: [PATCH] s390/kprobes: Prevent kprobes on instructions with exception table entry Message-ID: <20261002085921.21787C22-hca@linux.ibm.com> References: <20260924115725.1108581-1-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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260924115725.1108581-1-hca@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: H8mPvPQSyFA8_ipbqg1AFy0fjeusu82j X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDAyMDAzNCBTYWx0ZWRfX5rZuChXS8d0w jApKVEaziRlJRz44uncd0WxW2iBdeh1uSz2CD18FCPlRekOxO/CRaz7Nm6WHSRwArK6FRwslqe7 OJAzB2b2COSruxjywAR9h1Mq7LbkMS6/Q6C2pRNZFLuRwrzccY0TD/eY25UmcUWfSU27x49Q2+d zSEjWox7Chms+MZZXch712xEPnxS8+PQVr88QHKUVcoTYIq7WMPoL6NOnOZgUTqsoQU7sgMWcjy 348KCCqB5T6rPzBuM94A6NE4bCH3bA38TGrCAcDsiiUh0nMeuxyVQ8BGTnAzo1Zal0QoVsWcSLc E/HO2gp1LRr4I+1p99hys5IDF0BTzB1gX2Cv19CHTir7zgjH/9SRbg8LMQdBSu4150BbNiVrQ6a Zl7Sh8rFKgt8Tk3N5gqzk2z//AvZLhJUVvJUAKisb2zU4zz0PGTtTw2aI77v6m9ohd5PFqIxc4c UhNhULEKMtc3cWQy7Zg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDAyMDAzNCBTYWx0ZWRfXzSo674Y1mLu9 6ztOmnGwbJ8ceD4gSryqv/oEjUDTvTP1Crk9sUu3CxIEZt4GAPfx56t0uEUT6Y8LP2v2zuxI3iK 5yDk2KSA8EtcZBetZVvprY5FFH6nemM= X-Authority-Analysis: v=2.4 cv=EY5d0/mC c=1 sm=1 tr=0 ts=6abf726f cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=a_u-TuGqFIQ8ZqSRPssA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: H8mPvPQSyFA8_ipbqg1AFy0fjeusu82j 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=2026-10-02_02,2026-10-01_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 suspectscore=0 adultscore=0 clxscore=1015 malwarescore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610020034 On Thu, Sep 24, 2026 at 01:57:24PM +0200, Heiko Carstens wrote: > The mvcos exception handler ex_handler_ua_mvcos() decodes the faulting > instruction, assuming it is an mvcos instruction. In case the instruction > is kprobed the decoded instruction is a breakpoint instruction instead, > which leads to incorrect instruction decoding and potential register > corruption. > > Fix this by simply preventing to set a kprobe on such instructions, > similar like arm64 is doing it. > > Fixes: c488f5187a24 ("s390/uaccess: Shorten raw_copy_from_user() / raw_copy_to_user() inline assemblies") > Cc: stable@vger.kernel.org > Signed-off-by: Heiko Carstens > --- > arch/s390/kernel/kprobes.c | 3 +++ > 1 file changed, 3 insertions(+) This patch has been integrated as first patch into https://lore.kernel.org/all/20261001103247.1989111-1-hca@linux.ibm.com/