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xen-devel
Re: [Xen-devel] is_loadable_phdr
On Thu, 28 Jan 2010 21:14:14 +0000
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> On 28/01/2010 19:55, "Brad Plant" <bplant@xxxxxxxxxxxx> wrote:
>
> > I'm trying to get an understanding of why a segment has to be writeable or
> > executable for xen to load it. Does anyone know why this is so?
> >
> > Also, is it likely that this behaviour could be changed? My understanding is
> > that it's perfectly valid to have an ELF kernel with read-only segments in
> > it.
> > Attempting to use an image with a read-only segment leads to the kernel
> > failing to boot with weird and hard to debug crashes.
>
> Yes, we can change that. Send a patch for it.
So there's no reason not loading read-only segments then?
I've attached a patch that'll change elf_phdr_is_loadable's behaviour. It just
adds PF_R into the mix. I don't know if this will cause some unwanted side
effects. Unfortunately there'll be some very unhappy people if I go rebooting
an entire physical machine at the moment.
Cheers,
Brad
libelf-tools.c.patch
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