grsecurity forums

by **NeedSecurity** » Tue Apr 19, 2005 5:35 am

Hi, when I apply the grsec patch to my kernel ( with medium level ), during reboot or shutdown I got that error:

MOUNT: / IS BUSY

I tried on 2 pc with Debian Sarge Testing
I tried with 2.4.29 and 2.4.30 kernel

but I got always the same error.
Is it a bug or I need to fix someting ?

Thanks

by **spender** » Wed Apr 20, 2005 10:02 pm

I run debian as well and have received this error occasionally. I haven't been able to reliably reproduce it on each boot, however. I've also only seen reports of this problem from Debian users. Are there any users of other distros having this problem?

-Brad

by **NeedSecurity** » Fri Apr 22, 2005 6:09 am

I have this error everytime I reboot or shutdown. It's not occasionally for me.

by **forsaken** » Mon Apr 25, 2005 7:08 am

I also see this problem quite often at reboot, not everytime but since I don't reboot very often and do so remotely (most of the time) I may be wrong. This is using gentoo and 2.6.x.

by **NeedSecurity** » Tue Apr 26, 2005 12:42 pm

this bug don't interest to grsecurity developpers ?

by **PaX Team** » Tue Apr 26, 2005 6:02 pm

NeedSecurity wrote:this bug don't interest to grsecurity developpers ?

interested yes, but it's hard to tell what's wrong without knowing what open file is keeping the mount busy... maybe it's possible to run lsof towards the end of the reboot process to get a hint?

by **NeedSecurity** » Wed Apr 27, 2005 5:41 am

PaX Team, If u prefer, I can give you a root access on a pc where I'll install Debian with kernel 2.4.30 + grsec patch, so U can work better. I'll wait your answer

by **PaX Team** » Wed Apr 27, 2005 12:30 pm

NeedSecurity wrote:PaX Team, If u prefer, I can give you a root access on a pc where I'll install Debian with kernel 2.4.30 + grsec patch, so U can work better. I'll wait your answer

sorry, i won't have time for this any time soon, maybe spender or someone else does. on a sidenote, offering rootshells is better discussed in encrypted private mail ;-)

.

by **NeedSecurity** » Wed Apr 27, 2005 1:47 pm

If u want I make a pc for testing this error, It's an emplty pc, just debian installed and internet connection. If u want i give in private root pass.
Please help us Debian users

This lovable distro !

by **spender** » Tue May 03, 2005 11:51 pm

http://grsecurity.net/~spender/debug.diff

Apply this patch to your 2.4 kernel. It'll display the files processes have open upon reboot. Let me know what it outputs.

-Brad

by **NeedSecurity** » Wed May 04, 2005 5:56 am

I do that:
applied grsec patch to vanilla kernel 2.4.30
applied that patch going to /usr/src/linux/kernel and doing patch -p0 < ./debug.diff
compiled and installed kernel with medium security grsec setting.

On reboot I got always that error MOUNT: / IS BUSY, but on the screen I don't see any open list files

by **spender** » Wed May 04, 2005 8:58 am

http://grsecurity.net/~spender/debug2.diff

Try this patch instead.

-Brad

by **NeedSecurity** » Fri May 13, 2005 3:47 am

noting.. I got always the same error without see any open files applying that patch.

by **spender** » Sat May 14, 2005 4:19 pm

I'll need access to your system then, since I haven't been able to reproduce this bug on my system for quite some time, and the debugging patch I sent you produced a list of open files on my system (even though there was no problem unmounting the drive). Email me at spender@grsecurity.net.

-Brad