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SubjectRe: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking

* Sarah Sharp <sarah.a.sharp@linux.intel.com> wrote:

> On Fri, Nov 26, 2010 at 08:48:09AM +0100, Ingo Molnar wrote:
> >
> > * Linus Torvalds <torvalds@linux-foundation.org> wrote:
> >
> > > On Fri, Nov 19, 2010 at 11:19 AM, Sarah Sharp
> > > <sarah.a.sharp@linux.intel.com> wrote:
> > > >
> > > > .config and dmesg are attached.  The box is running klogd 1.5.5ubuntu3
> > > > (from Jaunty).  Yes, I know that's old.  I read the bit in the commit
> > > > about changing the permissions of kallsyms after boot, but if I can't
> > > > boot that doesn't help.  Perhaps this can be made a configuration
> > > > option?
> > >
> > > It's not worth a config option.
> > >
> > > If it actually breaks user-space, I think we should just revert it.
> >
> > Sarah,
> >
> > Does your system boot fine if we make /proc/kallsyms simply an empty file to
> > unprivileged users? Something like the (untested ...) patch below.
>
> Yes, that works. The system boots as normal. `cat /proc/kallsyms`
> returns an empty file, and `sudo cat /proc/kallsyms` does not.

Great! Marcus, mind respinning your patch with that approach?

Thanks,

Ingo
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