lkml.org 
[lkml]   [2020]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 0/1] Add explicit error for missing CONFIG_ASN1
From
Date
On Tue, 2020-09-22 at 12:38 -0700, Randy Dunlap wrote:
> On 9/22/20 12:19 PM, James Bottomley wrote:
> > On Tue, 2020-09-22 at 11:54 -0700, Randy Dunlap wrote:
> > > On 9/22/20 8:53 AM, James Bottomley wrote:
> > > > I recently ran into this as an error from 0day. On x86 it's
> > > > pretty
> > > > much impossible to build a configuration where CONFIG_ASN1
> > > > isn't
> > > > set, so you rarely notice a problem using the ASN.1 compiler
> > > > because something else has selected it. However, this compiler
> > > > is
> > > > never built if CONFIG_ASN1 isn't set and the error you get from
> > > > kbuild is particularly unhelpful:
> > > >
> > > > make[4]: *** No rule to make target 'security/keys/trusted-
> > > > keys/tpm2key.asn1.o', needed by 'security/keys/trusted-
> > > > keys/built-
> > > > in.a'.
> > > > make[4]: *** [scripts/Makefile.build:283:
> > > > security/keys/trusted-
> > > > keys/trusted_tpm2.o] Error 1
> > > > make[4]: Target '__build' not remade because of errors.
> > > >
> > > > This patch changes the above error to the much easier to
> > > > diagnose:
> > > >
> > > > scripts/Makefile.build:387: *** CONFIG_ASN1 must be defined
> > > > for
> > > > the asn1_compiler. Stop.
> > > > make[3]: *** [scripts/Makefile.build:505:
> > > > security/keys/trusted-
> > > > keys] Error 2
> > > >
> > > > James
> > > >
> > > > ---
> > > >
> > > > James Bottomley (1):
> > > > Makefile.build: Add an explicit error for missing ASN.1
> > > > compiler
> > > >
> > > > scripts/Makefile.build | 5 +++++
> > > > 1 file changed, 5 insertions(+)
> > >
> > > Is there a missing
> > > select ASN1
> > > somewhere?
> >
> > You mean in the build used to produce the errors above? Yes, so
> > the
> > patch is to make the problem more explicit.
>
> I appreciate that the message can be improved, but it seems possible
> that some Kconfig could also be improved.

I don't really see how. To find the problem you have to identify a
conditional build in the Makefile that requires the asn1 compiler but
for which the config option doesn't have a select ASN1. We don't
currently preserve the "what selected this symbol" information in
kconfig, which is what we'd need.

James

\
 
 \ /
  Last update: 2020-09-22 21:44    [W:0.048 / U:4.860 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site