Messages in this thread | | | From | Linus Torvalds <> | Date | Fri, 19 Nov 2010 11:54:26 -0800 | Subject | Re: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking |
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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. It's kind of sad to default to the world-visible thing, but as I mentioned in the commit, this is something where a sysadmin or distro can trivially just fix it at boot-time too, with just a
chmod og-r /proc/kallsyms
in your bootup scripts.
And if somebody has taken control of the machine _before_ the bootup scripts get to run, you have bigger problems than a /proc/kallsyms file.
So I guess I'll revert it.
Thanks for testing and bisecting.
Linus -- 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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