linux-kernel - Re: [PATCH] chroot= as a new kernel parameter

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Message-ID: <20080305081016.GA9257@elf.ucw.cz>
Date:	Wed, 5 Mar 2008 09:10:16 +0100
From:	Pavel Machek <pavel@....cz>
To:	Pawel Plociennik <paplociennik@...il.com>
Cc:	Guillaume Chazarain <guichaz@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] chroot= as a new kernel parameter

Hi!

> On Monday 03 March 2008 10:19, Guillaume Chazarain wrote:
> >
> > init=/working_distro/lib/ld-linux.so.2 --library-path
> > /working_distro/lib  /working_distro/usr/sbin/chroot /working_distro/
> > /sbin/init
> > 
> root=<root> init=/working_distro/lib/ld-linux.so.2 --library-path 
> /working_distro/lib working_distro/usr/sbin/chroot /working_distro/ /sbin/init
> 
> I think that it is *interestly* hack but I am not sure that it will be an usable method for all of a distroes which exists on the world.
> At last my patch is as simple as possible and it has *only* a *few lines of the code* and it can be used
> as *independent* method to various *hundred* distroes.
> 
> root=<root> chroot=<chroot>
> 
> and it looks *beautiful* I think :-)
> 
> so I have sent a patch again which it has corrected a *coding style* and a new description in a kernel-parameters.txt file
> (a suggestions for better description are welcome).
> I think that this can be a *last version* of a patch.
> Because I am *newbie* in a kernel hacking I hope that someone will had been written me what now with it ?
> Maybe send this patch *directly* to *kernel guru* such as Andrew
> Morton which manages a -mm series ?

You need to add Signed-off-by... as per
Documentation/Submitting*... and proper changelog would be nice.

And you can add 

Acked-by: Pavel Machek <pavel@...e.cz>

Yes, I think this should go to mm. ... but better Cc Andrew next time.
								Pavel

> 
> diff -urp linux-2.6.24-orig/Documentation/kernel-parameters.txt linux-2.6.24/Documentation/kernel-parameters.txt
> --- linux-2.6.24-orig/Documentation/kernel-parameters.txt	2008-02-25 20:53:26.000000000 -0500
> +++ linux-2.6.24/Documentation/kernel-parameters.txt	2008-03-04 09:51:52.000000000 -0500
> @@ -381,6 +381,8 @@ and is between 256 and 4096 characters. 
>  			Value can be changed at runtime via
>  				/selinux/checkreqprot.
>  	
> +	chroot=		[KNL] change a root for an init process.
> +
>  	clock=		[BUGS=X86-32, HW] gettimeofday clocksource override.
>  			[Deprecated]
>  			Forces specified clocksource (if available) to be used
> diff -urp linux-2.6.24-orig/init/main.c linux-2.6.24/init/main.c
> --- linux-2.6.24-orig/init/main.c	2008-03-01 12:58:37.000000000 -0500
> +++ linux-2.6.24/init/main.c	2008-03-05 08:23:32.000000000 -0500
> @@ -755,8 +755,20 @@ static void __init do_pre_smp_initcalls(
>  		spawn_softlockup_task();
>  }
>  
> +static void *chroot_str;
> +static int __init chroot_setup(char *str)
> +{
> +	chroot_str = str;
> +	return 1;
> +}
> +__setup("chroot=", chroot_setup);
> +
>  static void run_init_process(char *init_filename)
>  {
> +	if (chroot_str)
> +		if (sys_chroot(chroot_str) < 0)
> +			printk(KERN_WARNING "chroot=%s failed\n", chroot_str);
> +
>  	argv_init[0] = init_filename;
>  	kernel_execve(init_filename, argv_init, envp_init);
>  }

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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