On 04/05/17 at 09:15pm, David Howells wrote: > From: Chun-Yi Lee <joeyli.kernel at gmail.com> > > When KEXEC_VERIFY_SIG is not enabled, kernel should not loads image > through kexec_file systemcall if securelevel has been set. > > This code was showed in Matthew's patch but not in git: > https://lkml.org/lkml/2015/3/13/778 > > Cc: Matthew Garrett <mjg59 at srcf.ucam.org> > Signed-off-by: Chun-Yi Lee <jlee at suse.com> > Signed-off-by: David Howells <dhowells at redhat.com> > cc: kexec at lists.infradead.org > --- > > kernel/kexec_file.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c > index b118735fea9d..f6937eecd1eb 100644 > --- a/kernel/kexec_file.c > +++ b/kernel/kexec_file.c > @@ -268,6 +268,12 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, > if (!capable(CAP_SYS_BOOT) || kexec_load_disabled) > return -EPERM; > > + /* Don't permit images to be loaded into trusted kernels if we're not > + * going to verify the signature on them > + */ > + if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) && kernel_is_locked_down()) > + return -EPERM; > + > /* Make sure we have a legal set of flags */ > if (flags != (flags & KEXEC_FILE_FLAGS)) > return -EINVAL; > > > _______________________________________________ > kexec mailing list > kexec at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec Acked-by: Dave Young <dyoung at redhat.com> Thanks Dave
