diff options
| author | Jiri Bohac <jbohac@suse.cz> | 2019-08-20 02:17:44 +0200 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2019-08-20 06:54:15 +0200 |
| commit | 99d5cadfde2b1acb7650021df5abaa5ec447dd10 (patch) | |
| tree | 49af3ab9d60ad3191426f616750002f1720562cc /security | |
| parent | lockdown: Copy secure_boot flag in boot params across kexec reboot (diff) | |
| download | linux-99d5cadfde2b1acb7650021df5abaa5ec447dd10.tar.xz linux-99d5cadfde2b1acb7650021df5abaa5ec447dd10.zip | |
kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE
This is a preparatory patch for kexec_file_load() lockdown. A locked down
kernel needs to prevent unsigned kernel images from being loaded with
kexec_file_load(). Currently, the only way to force the signature
verification is compiling with KEXEC_VERIFY_SIG. This prevents loading
usigned images even when the kernel is not locked down at runtime.
This patch splits KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE.
Analogous to the MODULE_SIG and MODULE_SIG_FORCE for modules, KEXEC_SIG
turns on the signature verification but allows unsigned images to be
loaded. KEXEC_SIG_FORCE disallows images without a valid signature.
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Matthew Garrett <mjg59@google.com>
cc: kexec@lists.infradead.org
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/Kconfig | 2 | ||||
| -rw-r--r-- | security/integrity/ima/ima_main.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index 2692c7358c2c..32cd25fa44a5 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -160,7 +160,7 @@ config IMA_APPRAISE config IMA_ARCH_POLICY bool "Enable loading an IMA architecture specific policy" - depends on KEXEC_VERIFY_SIG || IMA_APPRAISE && INTEGRITY_ASYMMETRIC_KEYS + depends on KEXEC_SIG || IMA_APPRAISE && INTEGRITY_ASYMMETRIC_KEYS default n help This option enables loading an IMA architecture specific policy diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index f556e6c18f9b..1cffda4412b7 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -541,7 +541,7 @@ int ima_load_data(enum kernel_load_data_id id) switch (id) { case LOADING_KEXEC_IMAGE: - if (IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) + if (IS_ENABLED(CONFIG_KEXEC_SIG) && arch_ima_get_secureboot()) { pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n"); return -EACCES; |