[gentoo-dev] Prelink and init

[gentoo-dev] Prelink and init

[Stefan Jones]

Hi all,

I am trying to bury bug http://bugs.gentoo.org/show_bug.cgi?id=42929

If you run prelink and change /sbin/init then you have to run "init u"
otherwise you cannot unmount the root filesystem as the kernel has a
stray mmap memory segment relating to the old /sbin/int executable.

"init u" re-executes the binary getting rid of the old mmap.

Now the old solution I can think of is a quick hack in the main()
function of the prelink executable to run this command automatically if
/sbin/init is changed. This can be disabled with a command line switch.

Any comments, if no other solutions I will implement it,

Stefan


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Re: [gentoo-dev] Prelink and init

[Mike Frysinger]

On Thursday 09 September 2004 01:00 pm, Stefan Jones wrote:
> If you run prelink and change /sbin/init then you have to run "init u"
> otherwise you cannot unmount the root filesystem as the kernel has a
> stray mmap memory segment relating to the old /sbin/int executable.
>
> "init u" re-executes the binary getting rid of the old mmap.

what about we add this to the init scripts ?
if the remount fails, try running `init u` and then umounting again ?
-mike

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Re: [gentoo-dev] Prelink and init

[Stefan Jones]

I do not think you can call "init u" or that it will not do anything if
init is in the process of changing runlevels.

I may be wrong, but that is why I discarded that solution.

Stefan

On Thu, 2004-09-09 at 10:22, Mike Frysinger wrote:
> On Thursday 09 September 2004 01:00 pm, Stefan Jones wrote:
> > If you run prelink and change /sbin/init then you have to run "init u"
> > otherwise you cannot unmount the root filesystem as the kernel has a
> > stray mmap memory segment relating to the old /sbin/int executable.
> >
> > "init u" re-executes the binary getting rid of the old mmap.
> 
> what about we add this to the init scripts ?
> if the remount fails, try running `init u` and then umounting again ?
> -mike
> 
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> gentoo-dev@gentoo.org mailing list


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Re: [gentoo-dev] Prelink and init

[Stefan Jones]

Well I did the quick hack. See prelink-20040707.ebuild and
prelink-20040707-init.patch

Any comments? Shall I unmask it?

Stefan

On Thu, 2004-09-09 at 10:40, Stefan Jones wrote:
> I do not think you can call "init u" or that it will not do anything if
> init is in the process of changing runlevels.
> 
> I may be wrong, but that is why I discarded that solution.
> 
> Stefan
> 
> On Thu, 2004-09-09 at 10:22, Mike Frysinger wrote:
> > On Thursday 09 September 2004 01:00 pm, Stefan Jones wrote:
> > > If you run prelink and change /sbin/init then you have to run "init u"
> > > otherwise you cannot unmount the root filesystem as the kernel has a
> > > stray mmap memory segment relating to the old /sbin/int executable.
> > >
> > > "init u" re-executes the binary getting rid of the old mmap.
> > 
> > what about we add this to the init scripts ?
> > if the remount fails, try running `init u` and then umounting again ?
> > -mike
> > 
> > --
> > gentoo-dev@gentoo.org mailing list
> 
> 
> --
> gentoo-dev@gentoo.org mailing list


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