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kexec_file: Restrict at runtime if the kernel is locked down

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When KEXEC_SIG is not enabled, kernel should not load images through
kexec_file systemcall if the kernel is locked down.

[Modified by David Howells to fit with modifications to the previous patch
 and to return -EPERM if the kernel is locked down for consistency with
 other lockdowns. Modified by Matthew Garrett to remove the IMA
 integration, which will be replaced by integrating with the IMA
 architecture policy patches.]

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>
This commit is contained in:
Jiri Bohac 2019-08-19 17:17:45 -07:00 committed by James Morris
parent 99d5cadfde
commit 155bdd30af
1 changed files with 1 additions and 1 deletions
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2
kernel/kexec_file.c
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@ -208,7 +208,7 @@ kimage_validate_signature(struct kimage *image)
return ret;
}
return 0;
return security_locked_down(LOCKDOWN_KEXEC);
/* All other errors are fatal, including nomem, unparseable
* signatures and signature check failures - even if signatures