Messages in this thread | | | Date | Mon, 29 Nov 2010 19:04:29 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking |
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* 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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