linux-kernel - Re: [PATCH 176/190] Revert "net/net_namespace: Check the return value of register_pernet

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Date:   Tue, 27 Apr 2021 18:51:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     linux-kernel@...r.kernel.org, Aditya Pakki <pakki001@....edu>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH 176/190] Revert "net/net_namespace: Check the return
 value of register_pernet_subsys()"

On Wed, Apr 21, 2021 at 11:45:26PM +0300, Kirill Tkhai wrote:
> On 21.04.2021 16:00, Greg Kroah-Hartman wrote:
> > This reverts commit 0eb987c874dc93f9c9d85a6465dbde20fdd3884c.
> > 
> > Commits from @umn.edu addresses have been found to be submitted in "bad
> > faith" to try to test the kernel community's ability to review "known
> > malicious" changes.  The result of these submissions can be found in a
> > paper published at the 42nd IEEE Symposium on Security and Privacy
> > entitled, "Open Source Insecurity: Stealthily Introducing
> > Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> > of Minnesota) and Kangjie Lu (University of Minnesota).
> > 
> > Because of this, all submissions from this group must be reverted from
> > the kernel tree and will need to be re-reviewed again to determine if
> > they actually are a valid fix.  Until that work is complete, remove this
> > change to ensure that no problems are being introduced into the
> > codebase.
> > 
> > Cc: Aditya Pakki <pakki001@....edu>
> > Cc: Kirill Tkhai <ktkhai@...tuozzo.com>
> > Cc: David S. Miller <davem@...emloft.net>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> >  net/core/net_namespace.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
> > index 43b6ac4c4439..9ae0b275238e 100644
> > --- a/net/core/net_namespace.c
> > +++ b/net/core/net_namespace.c
> > @@ -1101,8 +1101,7 @@ static int __init net_ns_init(void)
> >  	init_net_initialized = true;
> >  	up_write(&pernet_ops_rwsem);
> >  
> > -	if (register_pernet_subsys(&net_ns_ops))
> > -		panic("Could not register network namespace subsystems");
> > +	register_pernet_subsys(&net_ns_ops);
> 
> Nacked-by: Kirill Tkhai <ktkhai@...tuozzo.com>
> 
> This patch does not have any problem, since it has been already carefully reviewed.
> Kernel panics here only, if we can't allocate ns_common::inum for init_net.
> This can be only a result of a critical deficiency of memory during boot.

Odd, ok, I'll drop this but this feels strange...

greg k-h