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    SubjectRe: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking
    On 11/04/2010 10:38 AM, Tejun Heo wrote:
    > Hello,
    > On 11/04/2010 03:33 PM, Marcus Meissner wrote:
    >> I mean the kernel could hide it from uname, but lsb_release,
    >> /etc/redhat-release, /etc/SuSE-release etc still exist and then you
    >> can still use the fixed address list table inside your exploit. But an
    >> exploits needs to have such a list, making it harder to write.
    > I do believe that making things more difficult to exploit helps. Many
    > people seem to think it only gives false sense of security tho.
    >> I also briefly thought about kernel ASLR, but my knowledge of the kernel
    >> loading is too limited whether this is even possible or at all useful.
    > We already have relocatable kernel for kdump and IIRC it doesn't add
    > runtime overhead, so putting the kernel at random address shouldn't be
    > too difficult. Not sure how useful that would be tho.

    It's very coarse-grained relocation, which is why it works.


    P.S. It's not just for kdump anymore.

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