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Tue, 21 Nov 2023 22:02:59 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0D40F20063; Tue, 21 Nov 2023 22:02:59 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 96C3220067; Tue, 21 Nov 2023 22:02:57 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.179.23.98]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 21 Nov 2023 22:02:57 +0000 (GMT) From: Ilya Leoshkevich To: Alexander Gordeev , Alexander Potapenko , Andrew Morton , Christoph Lameter , David Rientjes , Heiko Carstens , Joonsoo Kim , Marco Elver , Masami Hiramatsu , Pekka Enberg , Steven Rostedt , Vasily Gorbik , Vlastimil Babka Cc: Christian Borntraeger , Dmitry Vyukov , Hyeonggon Yoo <42.hyeyoo@gmail.com>, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Mark Rutland , Roman Gushchin , Sven Schnelle , Ilya Leoshkevich Subject: [PATCH v2 29/33] s390/traps: Unpoison the kernel_stack_overflow()'s pt_regs Date: Tue, 21 Nov 2023 23:01:23 +0100 Message-ID: <20231121220155.1217090-30-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231121220155.1217090-1-iii@linux.ibm.com> References: <20231121220155.1217090-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: urf4wyq_YMj9bTfGVt1cQOZ1POJmOTf- X-Proofpoint-ORIG-GUID: 3zsdaRQNzKCdIMz7-it2_V5FFdGTniq- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-21_12,2023-11-21_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 suspectscore=0 adultscore=0 malwarescore=0 priorityscore=1501 phishscore=0 clxscore=1015 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311210172 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: C8C741C001E X-Stat-Signature: gcanihytqsfutdmk3w5sfkjzxat5x9mr X-Rspam-User: X-HE-Tag: 1700604190-642032 X-HE-Meta: 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 9Hr3jbSv 2GwBzr1zZfw57PQmqebww3OrlVq300kjXDtbYbvgVY71R+bPB15A9nPXehkjRB1Db7L3qQIAQwkkw6f62z6xEPKzHsiBsyIFdl2Ao7kbbXEMcIlY8HjyzggHfgiLbSympTvFeQiHk9cUbmi5qcRuAKMb9n7iUcu7OzjNIxQh9OKFFYoOEGZueZvL/8jUQbq203AMRb8unfj4Xb2n5HV8+XYFoRmMCEfhRbZUxD2UpeKoRwgdON7Q78gRTz+filJinUdPoBtrusK1rMKRnv7gxBFuEEOpAiqkfmsMB X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This is normally done by the generic entry code, but the kernel_stack_overflow() flow bypasses it. Reviewed-by: Alexander Potapenko Signed-off-by: Ilya Leoshkevich --- arch/s390/kernel/traps.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index 1d2aa448d103..f299b1203a20 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -260,6 +261,11 @@ static void monitor_event_exception(struct pt_regs *regs) void kernel_stack_overflow(struct pt_regs *regs) { + /* + * Normally regs are unpoisoned by the generic entry code, but + * kernel_stack_overflow() is a rare case that is called bypassing it. + */ + kmsan_unpoison_entry_regs(regs); bust_spinlocks(1); printk("Kernel stack overflow.\n"); show_regs(regs); -- 2.41.0