On Tue, Feb 15, 2022 at 08:39:40PM +0100, Michal Suchanek wrote:
> 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: Philipp Rudo <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
> Signed-off-by: Michal Suchanek <[email protected]>
Reviewed-by: "Lee, Chun-Yi" <[email protected]>
> ---
> arch/s390/kernel/machine_kexec_file.c | 18 +++++++++++++-----
> 1 file changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/arch/s390/kernel/machine_kexec_file.c
> b/arch/s390/kernel/machine_kexec_file.c
> index 8f43575a4dd3..fc6d5f58debe 100644
> --- a/arch/s390/kernel/machine_kexec_file.c
> +++ b/arch/s390/kernel/machine_kexec_file.c
> @@ -31,6 +31,7 @@ int s390_verify_sig(const char *kernel, unsigned long
> kernel_len)
> 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)
> @@ -65,11 +66,18 @@ int s390_verify_sig(const char *kernel, unsigned long
> kernel_len)
> 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 */
>
> --
> 2.31.1
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