linux-kernel - Re: [PATCH v2] audit,module: restore audit logging in load failure case

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Message-ID: <aAe3wrAzD/7jBtHy@madcap2.tricolour.ca>
Date: Tue, 22 Apr 2025 11:37:38 -0400
From: Richard Guy Briggs <rgb@...hat.com>
To: Paul Moore <paul@...l-moore.com>
Cc: Linux-Audit Mailing List <linux-audit@...ts.linux-audit.osci.io>,
	LKML <linux-kernel@...r.kernel.org>, linux-modules@...r.kernel.org,
	Linux Kernel Audit Mailing List <audit@...r.kernel.org>,
	Eric Paris <eparis@...isplace.org>
Subject: Re: [PATCH v2] audit,module: restore audit logging in load failure
 case

On 2025-04-11 14:23, Paul Moore wrote:
> On Mar 17, 2025 Richard Guy Briggs <rgb@...hat.com> wrote:
> > 
> > The move of the module sanity check to earlier skipped the audit logging
> > call in the case of failure and to a place where the previously used
> > context is unavailable.
> > 
> > Add an audit logging call for the module loading failure case and get
> > the module name when possible.
> > 
> > Link: https://issues.redhat.com/browse/RHEL-52839
> > Fixes: 02da2cbab452 ("module: move check_modinfo() early to early_mod_check()")
> > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> > ---
> > Changelog:
> > v2
> > - use info->name for both audit_log_kern_module() calls and add const
> > ---
> >  include/linux/audit.h | 9 ++++-----
> >  kernel/audit.h        | 2 +-
> >  kernel/auditsc.c      | 2 +-
> >  kernel/module/main.c  | 6 ++++--
> >  4 files changed, 10 insertions(+), 9 deletions(-)
> 
> Agree with Petr's previous comment about the URL in the commit
> description, if it isn't publicly accessible please don't include it in
> the commit description; I'm going to remove it.

Sorry, I thought I had checked it more than once to make sure it was
visible.  It should be now.  Please re-add the link.

> > diff --git a/kernel/module/main.c b/kernel/module/main.c
> > index 1fb9ad289a6f..efa62ace1b23 100644
> > --- a/kernel/module/main.c
> > +++ b/kernel/module/main.c
> > @@ -3346,7 +3346,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
> >  
> >  	module_allocated = true;
> >  
> > -	audit_log_kern_module(mod->name);
> > +	audit_log_kern_module(info->name);
> >  
> >  	/* Reserve our place in the list. */
> >  	err = add_unformed_module(mod);
> > @@ -3506,8 +3506,10 @@ static int load_module(struct load_info *info, const char __user *uargs,
> >  	 * failures once the proper module was allocated and
> >  	 * before that.
> >  	 */
> > -	if (!module_allocated)
> > +	if (!module_allocated) {
> > +		audit_log_kern_module(info->name ? info->name : "(unavailable)");
> 
> In keeping with audit tradition, wouldn't we want this to be "?" instead
> of "(unavailable)"?
> 
> >  		mod_stat_bump_becoming(info, flags);
> > +	}
> >  	free_copy(info, flags);
> >  	return err;
> >  }
> > -- 
> > 2.43.5
> 
> --
> paul-moore.com
> _______________________________________________
> Linux-audit mailing list -- linux-audit@...ts.linux-audit.osci.io
> To unsubscribe send an email to linux-audit-leave@...ts.linux-audit.osci.io

- RGB

--
Richard Guy Briggs <rgb@...hat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
Upstream IRC: SunRaycer
Voice: +1.613.860 2354 SMS: +1.613.518.6570