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Mon, 9 Feb 2026 13:33:08 +0000 (GMT) From: Alexander Egorenkov To: akpm@linux-foundation.org, bhe@redhat.com Cc: kexec@lists.infradead.org Subject: [RESEND PATCH v1 1/1] s390/kexec: Make KEXEC_SIG available when CONFIG_MODULES=n Date: Mon, 9 Feb 2026 14:33:08 +0100 Message-ID: <20260209133308.118364-1-egorenar@linux.ibm.com> X-Mailer: git-send-email 2.51.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=YZiwJgRf c=1 sm=1 tr=0 ts=6989e217 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=VnNF1IyMAAAA:8 a=PG3QJfdP8arlf4ZJmCEA:9 X-Proofpoint-ORIG-GUID: 6otux3NwWeWGvEugXBEgH08Cm3jXXNeO X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjA5MDExMiBTYWx0ZWRfX6wh6cT/oWEf/ 4Iz9ISml5A1hisU6lY8/ECJnXHYLg2qW1WXMv1jl1UEPVVznNO6TZApAe6/O8UyBO0vCEV1TZnA kkET9PS6DCvxlPsUwIHEO0gLAltSXr0XKhIWM9opxJKWKocK/pKyFcxlw5tATWGlkbB4WJ7/l6t qPDe5fDiu17CEE4NKt1uIDI7Hy9QeYNh/4SMroRqcnljjAANaAK5inG45x8PgdC00WMhzaFssMs MQwtzu3YuWn42Vpz4OeSsV2uJPE9rqgR3mOPiAtlw4c85RGeTrqigh4w1t4W9FpXmSQu+4ikRiP JvGrpwMYx8/0EzfFopn3Hx7Pr9immUV+/L6JY6yCiyTOtPmt/+pqypn/AuyBCJ630WUwEyIYyjm m1ScL09OtpV2BmVTOH/0B245BFyfymRup4c/n3lY0UWvbHyzWvEeeKTW826OOf4QTkH1u0C57rk wdd8r1SZsI3nlqMeODg== X-Proofpoint-GUID: 6otux3NwWeWGvEugXBEgH08Cm3jXXNeO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-08_05,2026-02-09_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 impostorscore=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 adultscore=0 clxscore=1011 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602090112 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260209_053317_911231_1258E8BB X-CRM114-Status: GOOD ( 17.16 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org The commit c8424e776b09 ("MODSIGN: Export module signature definitions") replaced the dependency of KEXEC_SIG on SYSTEM_DATA_VERIFICATION with the dependency on MODULE_SIG_FORMAT. This change disables KEXEC_SIG in s390 kernels built with MODULES=n if nothing else selects MODULE_SIG_FORMAT. Furthermore, the signature verification in s390 kexec does not require MODULE_SIG_FORMAT because it requires only the struct module_signature and, therefore, does not depend on code in kernel/module_signature.c. But making ARCH_SUPPORTS_KEXEC_SIG depend on SYSTEM_DATA_VERIFICATION is also incorrect because it makes KEXEC_SIG available on s390 only if some other arbitrary option (for instance a file system or device driver) selects it directly or indirectly. To properly make KEXEC_SIG available for s390 kernels built with MODULES=y as well as MODULES=n _and_ also not depend on arbitrary options selecting SYSTEM_DATA_VERIFICATION, we set ARCH_SUPPORTS_KEXEC_SIG=y for s390 and select SYSTEM_DATA_VERIFICATION when KEXEC_SIG=y. Fixes: c8424e776b09 ("MODSIGN: Export module signature definitions") Signed-off-by: Alexander Egorenkov --- arch/s390/Kconfig | 2 +- kernel/Kconfig.kexec | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index c2c7bf974397..385c1052cf45 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -313,7 +313,7 @@ config ARCH_SUPPORTS_KEXEC_FILE def_bool y config ARCH_SUPPORTS_KEXEC_SIG - def_bool MODULE_SIG_FORMAT + def_bool y config ARCH_SUPPORTS_KEXEC_PURGATORY def_bool y diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec index 15632358bcf7..df97227cfca9 100644 --- a/kernel/Kconfig.kexec +++ b/kernel/Kconfig.kexec @@ -50,6 +50,7 @@ config KEXEC_SIG bool "Verify kernel signature during kexec_file_load() syscall" depends on ARCH_SUPPORTS_KEXEC_SIG depends on KEXEC_FILE + select SYSTEM_DATA_VERIFICATION if S390 help This option makes the kexec_file_load() syscall check for a valid signature of the kernel image. The image can still be loaded without -- 2.51.0