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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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