From: Michal Suchanek msuchanek@suse.de
commit 0828c4a39be57768b8788e8cbd0d84683ea757e5 upstream.
commit e23a8020ce4e ("s390/kexec_file: Signature verification prototype") adds support for KEXEC_SIG verification with keys from platform keyring but the built-in keys and secondary keyring are not used.
Add support for the built-in keys and secondary keyring as x86 does.
Fixes: e23a8020ce4e ("s390/kexec_file: Signature verification prototype") Cc: stable@vger.kernel.org Cc: Philipp Rudo prudo@linux.ibm.com Cc: kexec@lists.infradead.org Cc: keyrings@vger.kernel.org Cc: linux-security-module@vger.kernel.org Signed-off-by: Michal Suchanek msuchanek@suse.de Reviewed-by: "Lee, Chun-Yi" jlee@suse.com Acked-by: Baoquan He bhe@redhat.com Signed-off-by: Coiby Xu coxu@redhat.com Acked-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Mimi Zohar zohar@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/kernel/machine_kexec_file.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
--- a/arch/s390/kernel/machine_kexec_file.c +++ b/arch/s390/kernel/machine_kexec_file.c @@ -29,6 +29,7 @@ int s390_verify_sig(const char *kernel, const unsigned long marker_len = sizeof(MODULE_SIG_STRING) - 1; struct module_signature *ms; unsigned long sig_len; + int ret;
/* Skip signature verification when not secure IPLed. */ if (!ipl_secure_flag) @@ -63,11 +64,18 @@ int s390_verify_sig(const char *kernel, return -EBADMSG; }
- return verify_pkcs7_signature(kernel, kernel_len, - kernel + kernel_len, sig_len, - VERIFY_USE_PLATFORM_KEYRING, - VERIFYING_MODULE_SIGNATURE, - NULL, NULL); + ret = verify_pkcs7_signature(kernel, kernel_len, + kernel + kernel_len, sig_len, + VERIFY_USE_SECONDARY_KEYRING, + VERIFYING_MODULE_SIGNATURE, + NULL, NULL); + if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) + ret = verify_pkcs7_signature(kernel, kernel_len, + kernel + kernel_len, sig_len, + VERIFY_USE_PLATFORM_KEYRING, + VERIFYING_MODULE_SIGNATURE, + NULL, NULL); + return ret; } #endif /* CONFIG_KEXEC_SIG */