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Tue, 27 Oct 2026 14:30:31 +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 01/10] s390/jump_label: Serialize text patching with text_mutex Date: Tue, 27 Oct 2026 15:30:21 +0100 Message-ID: <20261027143030.3154657-2-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-s390@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=P8SvFSAu c=1 sm=1 tr=0 ts=6ae0b58b cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=mGn3vSmrZvqK9RYfsYoA:9 X-Proofpoint-GUID: mTgO3byzaCFNZg4K2s7op554enpd8AYc X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI3MDA1NiBTYWx0ZWRfXzdE55qzihhjP chf8WCJra114BjVkr04VRZAQuo7GI3EB/w4GgSby8yit5IK7QRaOXSRR5Mzpx1w/b1Yh6gDqg7e wCcez5lwbZ8RBDWBYG1+bWji7w3gn10= X-Proofpoint-ORIG-GUID: mTgO3byzaCFNZg4K2s7op554enpd8AYc X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI3MDA1NiBTYWx0ZWRfX9dQGF1JlB2qs dttWlEDK1vL+zxZE1NIZYlyDJjb/Wk0ubRoTjv2PFkEtAEdZmiSdDBB+hlNzHG40L6RBZ30mSRi SZih38Z/4aeJlULCgw6+fy97OsHWtQ/VM6fOsRTq7Bgs2rtn50xh6aBiQVi6v7ir1PVLYFzRps7 45OeZRxxKzlsv5/5ZL2mOrrmaPVbKVQCKSE1I1ER4MmNxf778epdP32vILdgdayL0tjgsN5B1rj lCW0TZ3xfQGdMvU+NDLnoeqqG7GGl+IKmM/BTbqkV45J90mEE7RcO2HSMpsevBt0+ptzhuRggUd rtEOfofX2gRE0TCzIy/r2cD0+K580FCwSZJvBUbCoofI4bqMZwmvlKrmRA4Ewd+g+RHFIx/yUHb 46NvaTMCeLw2vt1k2y4y5Jp4kdfsHPYLIa7ZkpgMD80zEBcyXcNMOYBCWIimAm2JVh2R19/hcKG Wwwd9PrsP56OQ9IAKoA== 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 adultscore=0 malwarescore=0 phishscore=0 spamscore=0 clxscore=1015 bulkscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=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 around the verify-then-patch sequence in jump_label_transform(). This way s390 uses text_mutex like other architectures and does not need to rely on other implicit semantics (e.g. no kprobe can be set on a jump label). This is part of larger series where at the end s390_kernel_write() requires that callers hold text_mutex for serialization. Signed-off-by: Heiko Carstens --- arch/s390/kernel/jump_label.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/s390/kernel/jump_label.c b/arch/s390/kernel/jump_label.c index e808bb8bc0da..548141eaa20b 100644 --- a/arch/s390/kernel/jump_label.c +++ b/arch/s390/kernel/jump_label.c @@ -5,6 +5,7 @@ * Copyright IBM Corp. 2011 * Author(s): Jan Glauber */ +#include #include #include #include @@ -57,6 +58,7 @@ static void jump_label_transform(struct jump_entry *entry, jump_label_make_branch(entry, &old); jump_label_make_nop(entry, &new); } + guard(mutex)(&text_mutex); if (memcmp(code, &old, sizeof(old))) jump_label_bug(entry, &old, &new); s390_kernel_write(code, &new, sizeof(new)); -- 2.53.0