Hi Mimi,
On Mon, Nov 21, 2022 at 01:23:57PM -0500, Mimi Zohar wrote:
Hi Coiby,
On Mon, 2022-11-21 at 15:29 +0800, Coiby Xu wrote:
A kernel builder may not enable KEXEC_SIG and some architectures like
ppc64 simply don't have KEXEC_SIG. In these cases, unless both
IMA_ARCH_POLICY and secure boot also enabled, lockdown doesn't prevent
unsigned kernel image from being kexec'ed via the kexec_file_load
syscall whereas it could prevent one via the kexec_load syscall. Mandate
signature verification for those cases.
Fixes: 155bdd30af17 ("kexec_file: Restrict at runtime if the kernel is locked
down")
Cc: Matthew Garrett <[email protected]>
Cc: Jiri Bohac <[email protected]>
Cc: David Howells <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Coiby Xu <[email protected]>
Other than correcting the function name to mandate_signature_verificati
on(),
Applied to v2, thanks for correcting me! Btw, I realize I overwrote the
return code of kexec_image_verify_sig with
mandate_signature_verification's. v2 has fixed this issue as well.
Reviewed-by: Mimi Zohar <[email protected]>
And thanks for the review!
--
Best regards,
Coiby
--
Best regards,
Coiby
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