On Tue, Feb 15, 2022 at 08:39:38PM +0100, Michal Suchanek wrote:
> commit d3bfe84129f6 ("certs: Add a secondary system keyring that can be added to dynamically")
> split of .system_keyring into .builtin_trusted_keys and
> .secondary_trusted_keys broke kexec, thereby preventing kernels signed by
> keys which are now in the secondary keyring from being kexec'd.
>
> Fix this by passing VERIFY_USE_SECONDARY_KEYRING to
> verify_pefile_signature().
>
> Cherry-picked from
> commit ea93102f3224 ("Fix kexec forbidding kernels signed with keys in the secondary keyring to boot")
>
> Fixes: 732b7b93d849 ("arm64: kexec_file: add kernel signature verification support")
> Cc: kexec@xxxxxxxxxxxxxxxxxxx
> Cc: keyrings@xxxxxxxxxxxxxxx
> Cc: linux-security-module@xxxxxxxxxxxxxxx
> Cc: stable@xxxxxxxxxx
> Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
Reviewed-by: "Lee, Chun-Yi" <jlee@xxxxxxxx>
> ---
> arch/arm64/kernel/kexec_image.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c
> index 9ec34690e255..1fbf2ee7c005 100644
> --- a/arch/arm64/kernel/kexec_image.c
> +++ b/arch/arm64/kernel/kexec_image.c
> @@ -133,7 +133,8 @@ static void *image_load(struct kimage *image,
> #ifdef CONFIG_KEXEC_IMAGE_VERIFY_SIG
> static int image_verify_sig(const char *kernel, unsigned long kernel_len)
> {
> - return verify_pefile_signature(kernel, kernel_len, NULL,
> + return verify_pefile_signature(kernel, kernel_len,
> + VERIFY_USE_SECONDARY_KEYRING,
> VERIFYING_KEXEC_PE_SIGNATURE);
> }
> #endif
> --
> 2.31.1
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