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Tue, 27 Oct 2026 14:30:32 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.87.85.9]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 27 Oct 2026 14:30:31 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Ilya Leoshkevich Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v2 06/10] s390/stackprotector: Serialize text patching with text_mutex Date: Tue, 27 Oct 2026 15:30:26 +0100 Message-ID: <20261027143030.3154657-7-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261027143030.3154657-1-hca@linux.ibm.com> References: <20261027143030.3154657-1-hca@linux.ibm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=ZYOIpcVA c=1 sm=1 tr=0 ts=6ae0b58c cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=_zDaQq67t2A-s4DWc54A:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI3MDA1NiBTYWx0ZWRfXwB4Vr9UIqfu4 5Q6ADNP8j5uJJKBAXxp6D1RXHfsU2pt7Oz4G4khldUOycr1/kOoJ4fhOvA9dRjtNAGteEKZfLwh b/hLP8bneVN4gPniv9oQYtDeXyygUWxEQpOVIUxWKU6kuai/TIGfi74+tmmL+NzwQg5JQC6AOpz lNmrP5GiwXceJIIOgHHZqvr83EmVx6/52HigBkt6UN93U9TFJSiiaCIjYUTU7UzIUpUoGQSufn4 63N2J4MBxy0WajzlkKKR8rZomRSqBUh9KBvXFxYns/FTjrbku9VtieAeRMOMOhOZmFsava3q8aU Q9Hd3dPwYLjAPtM+I0fbB1OQUHVWVO7henobPwPk1F4XGR/3vqyAPxidQrUXqc/rA+Dwzt0nZB3 cF0YFDjcsC1bsgsTnsiPcK/FZOY/7GZDT60gSBHNS6TMDJpzQOnfakYCUjEc9U3orrsJ55pxDaj JyHFCuBbygF5jDsc+4g== X-Proofpoint-GUID: W7lGfh6cbRpW5T18FkXw7QhNYQHF2P6T X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI3MDA1NiBTYWx0ZWRfX7iwucQmRSXGC by1/5kPl+cEWnzDu7reLr5F+Tjs1AJnRzpc5Hvc7WVV0SWCMwmRspO+kZlQ2NpNT/KYmKVyM5ED TrR/wu59InNWTmHXPMFdB5VFp0RF2b4= X-Proofpoint-ORIG-GUID: W7lGfh6cbRpW5T18FkXw7QhNYQHF2P6T X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-27_03,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 suspectscore=0 phishscore=0 clxscore=1015 bulkscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610270056 Acquire text_mutex inside __stack_protector_apply() to serialize text patching. Serialization is not required for __stack_protector_apply(), however this is part of larger series where at the end s390_kernel_write() requires that callers hold text_mutex. Signed-off-by: Heiko Carstens --- arch/s390/kernel/stackprotector.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/s390/kernel/stackprotector.c b/arch/s390/kernel/stackprotector.c index 8bd3ecf9200a..d72aef57a40a 100644 --- a/arch/s390/kernel/stackprotector.c +++ b/arch/s390/kernel/stackprotector.c @@ -6,6 +6,7 @@ #include #include +#include #include #include #include @@ -120,6 +121,9 @@ int __stack_protector_apply(unsigned long *start, unsigned long *end, unsigned l struct insn_ril *insn, new; int rc; +#ifndef __DECOMPRESSOR + guard(mutex)(&text_mutex); +#endif /* * Convert LARL/LGRL instructions to LLILF so register R1 contains the * address of the per-cpu / per-process stack canary: -- 2.53.0