linux-kernel - Re: [PATCH 5.4 03/74] module: merge repetitive strings in module_sig

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Date:   Mon, 5 Apr 2021 15:40:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sergey Shtylyov <s.shtylyov@...russia.ru>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Joe Perches <joe@...ches.com>, Miroslav Benes <mbenes@...e.cz>,
        Jessica Yu <jeyu@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.4 03/74] module: merge repetitive strings in
 module_sig_check()

On Mon, Apr 05, 2021 at 04:35:40PM +0300, Sergey Shtylyov wrote:
> On 4/5/21 11:53 AM, Greg Kroah-Hartman wrote:
> 
> > From: Sergey Shtylyov <s.shtylyov@...russia.ru>
> > 
> > [ Upstream commit 705e9195187d85249fbb0eaa844b1604a98fbc9a ]
> > 
> > The 'reason' variable in module_sig_check() points to 3 strings across
> > the *switch* statement, all needlessly starting with the same text.
> > Let's put the starting text into the pr_notice() call -- it saves 21
> > bytes of the object code (x86 gcc 10.2.1).
> > 
> > Suggested-by: Joe Perches <joe@...ches.com>
> > Reviewed-by: Miroslav Benes <mbenes@...e.cz>
> > Signed-off-by: Sergey Shtylyov <s.shtylyov@...russia.ru>
> > Signed-off-by: Jessica Yu <jeyu@...nel.org>
> > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > ---
> >  kernel/module.c | 9 +++++----
> >  1 file changed, 5 insertions(+), 4 deletions(-)
> > 
> > diff --git a/kernel/module.c b/kernel/module.c
> > index ab1f97cfe18d..9fe3e9b85348 100644
> > --- a/kernel/module.c
> > +++ b/kernel/module.c
> > @@ -2908,16 +2908,17 @@ static int module_sig_check(struct load_info *info, int flags)
> >  		 * enforcing, certain errors are non-fatal.
> >  		 */
> >  	case -ENODATA:
> > -		reason = "Loading of unsigned module";
> > +		reason = "unsigned module";
> >  		goto decide;
> >  	case -ENOPKG:
> > -		reason = "Loading of module with unsupported crypto";
> > +		reason = "module with unsupported crypto";
> >  		goto decide;
> >  	case -ENOKEY:
> > -		reason = "Loading of module with unavailable key";
> > +		reason = "module with unavailable key";
> >  	decide:
> >  		if (is_module_sig_enforced()) {
> > -			pr_notice("%s is rejected\n", reason);
> > +			pr_notice("%s: loading of %s is rejected\n",
> > +				  info->name, reason);
> 
>    Mhm, in 5.4 there was no printing of 'info->name'...

Is that now a problem?

thanks,

greg k-h