linux-kernel - Re: runaway loop modprobe binfmt-0000

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 8 Jan 2007 08:49:22 +1030
From:	"Tom Lanyon" <tomlanyon@...il.com>
To:	"Andrew Morton" <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: runaway loop modprobe binfmt-0000

On 1/6/07, Andrew Morton <akpm@...l.org> wrote:
> On Sat, 6 Jan 2007 09:43:14 +1030
> "Tom Lanyon" <tomlanyon@...il.com> wrote:
>
> > How can I discover
> > what is trying to load binfmt-0000 and why is it looping?
>
> Start with this, I guess..
>
> --- a/kernel/kmod.c~a
> +++ a/kernel/kmod.c
> @@ -98,10 +98,12 @@ int request_module(const char *fmt, ...)
>         atomic_inc(&kmod_concurrent);
>         if (atomic_read(&kmod_concurrent) > max_modprobes) {
>                 /* We may be blaming an innocent here, but unlikely */
> -               if (kmod_loop_msg++ < 5)
> +               if (kmod_loop_msg++ < 5) {
>                         printk(KERN_ERR
>                                "request_module: runaway loop modprobe %s\n",
>                                module_name);
> +                       dump_stack();
> +               }
>                 atomic_dec(&kmod_concurrent);
>                 return -ENOMEM;
>         }
> _
>
>

Thanks for the reply, Andrew.

How interesting... added that to kmod.c, rebuilt without change to
config, reboot.... machine booted perfectly!

I'm going to leave it for now, but I'll leave the dump_stack() call in
there in case further issues arise.

Regards

-- 
Tom Lanyon
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/