[PATCH v8 2/7] crash_dump: make dm crypt keys persist for the kdump kernel

[Coiby Xu]

On Wed, Apr 23, 2025 at 10:44:22PM +0200, Arnaud Lefebvre wrote:
>On Fri, Feb 07, 2025 at 04:08:10PM +0800, Coiby Xu wrote:
>>+config CRASH_DM_CRYPT
>>+	bool "Support saving crash dump to dm-crypt encrypted volume"
>>+	depends on KEXEC_FILE
>>+	depends on CRASH_DUMP
>>+	depends on DM_CRYPT
>>+	help
>>+	  With this option enabled, user space can intereact with
>>+	  /sys/kernel/config/crash_dm_crypt_keys to make the dm crypt keys
>>+	  persistent for the dump-capture kernel.
>>+
>
>Maybe also add CONFIG_CONFIGFS_FS option? Without it this series code doesn't compile:

I'll add the dependency on CONFIG_CONFIGFS_FS, thanks for your
suggestion!

>
>Last build lines:
>
>   GEN     modules.builtin
>   MODPOST vmlinux.symvers
>   UPD     include/generated/utsversion.h
>   CC      init/version-timestamp.o
>   KSYMS   .tmp_vmlinux0.kallsyms.S
>   AS      .tmp_vmlinux0.kallsyms.o
>   LD      .tmp_vmlinux1
> ld: vmlinux.o: in function `config_keys_make_item':
> /usr/src/linux/kernel/crash_dump_dm_crypt.c:250:(.text+0x228028): undefined reference to `config_item_init_type_name'
> ld: vmlinux.o: in function `configfs_dmcrypt_keys_init':
> /usr/src/linux/kernel/crash_dump_dm_crypt.c:442:(.init.text+0x71e5c): undefined reference to `config_group_init'
> ld: /usr/src/linux/kernel/crash_dump_dm_crypt.c:444:(.init.text+0x71e82): undefined reference to `configfs_register_subsystem'
> ld: /usr/src/linux/kernel/crash_dump_dm_crypt.c:454:(.init.text+0x71ef7): undefined reference to `configfs_unregister_subsystem'
> make[2]: *** [scripts/Makefile.vmlinux:77: vmlinux] Error 1
> make[1]: *** [/usr/src/linux/Makefile:1226: vmlinux] Error 2
> make: *** [Makefile:251: __sub-make] Error 2



-- 
Best regards,
Coiby