klibc - Jun 2004 - klibc-0.130: s390, run-init

OK, I have just pushed out klibc-0.130; it significantly updates the run-init 
program (again... PLEASE TEST IN A SAFE ENVIRONMENT) based on, but not 
identical to, Alexander's suggestions; it also adds s390/x patches from Arnd
Bergmann.

	-hpa

Olaf Hering wrote:
>  On Tue, Jun 08, H. Peter Anvin wrote:
> 
> 
>>OK, I have just pushed out klibc-0.130; it significantly updates the 
>>run-init program (again... PLEASE TEST IN A SAFE ENVIRONMENT) based on,
but
>>not identical to, Alexander's suggestions; it also adds s390/x
patches from
>>Arnd Bergmann.
> 
> 
> Hmm, havent looked at the code, but your mails sound like the
> implementation is a bit messy.
> I'm attaching what we ship with suse 9.1. Some corner cases still need
fixing.
> 
Your code doesn't clear out the initramfs at all (well, it does in the
script,
but it leaves a bunch of stuff in place); other than that, it does very little 
more: it does a bunch of safety checks to make sure it doesn't wipe a reap 
filesysttem, and it does the console redirection mainly so that all fds get 
opened O_RDWR.

By moving the filesystem wiping into run-init we can delete everything, 
including run-init itself.

	-hpa

On Tue, Jun 08, H. Peter Anvin wrote:
> OK, I have just pushed out klibc-0.130; it significantly updates the 
> run-init program (again... PLEASE TEST IN A SAFE ENVIRONMENT) based on, but
> not identical to, Alexander's suggestions; it also adds s390/x patches
from
> Arnd Bergmann.
Hmm, havent looked at the code, but your mails sound like the
implementation is a bit messy.
I'm attaching what we ship with suse 9.1. Some corner cases still need
fixing.

-- 
USB is for mice, FireWire is for men!

sUse lINUX ag, n?RNBERG
-------------- next part --------------
/* $Id: udev.run_init.c 136 2004-04-17 14:08:22Z olh $ */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mount.h>

#ifndef MS_MOVE
#warning MS_MOVE was not defined...
#define MS_MOVE         8192
#endif

static char final_init[] = "INIT";

int
main(int argc, char *argv[], char *envp[])
{
	char *init;

	if (getpid() != 1) {
		fprintf(stderr, "%s must be started from initramfs\n", argv[0]);
		goto good_bye;
	}

	init = getenv(final_init);
	if (!init) {
		init = "/sbin/init";
		fprintf(stderr, " %s not set, trying %s ... \n",
			final_init, init);
	}

	unlink(argv[0]);
	mount(".", "/", NULL, MS_MOVE, NULL);
	chroot(".");
	execve(init, argv, envp);

	fprintf(stderr, "\n\n ... %s returned ... \n\n", argv[0]);

      good_bye:
	return 1;
}
-------------- next part --------------
A non-text attachment was scrubbed...
Name: mkinitramfs-kinit.sh
Type: application/x-sh
Size: 7167 bytes
Desc: not available
Url :
http://www.zytor.com/pipermail/klibc/attachments/20040608/2b4083b1/mkinitramfs-kinit.sh