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    SubjectRe: [PATCH] use %pK for /proc/kallsyms and /proc/modules

    On Wed, Jan 26, 2011 at 03:57:06PM -0800, Andrew Morton wrote:
    > On Tue, 25 Jan 2011 10:10:58 -0800
    > Kees Cook <> wrote:
    > > Instead of messing with permissions on these files,
    > This implies that the patch alters permission handling, only it
    > doesn't. But I worked it out!

    Ah yeah, this was related to the earlier attempts to remove the contents
    of, or set permissions on, /proc/kallsyms.

    > > Note that this changes %x to %p, so some legitimately 0 values in
    > > /proc/kallsyms would have changed from 00000000 to "(null)". To avoid
    > > this, "(null)" is not used when using the "K" format. Anything parsing
    > > such addresses should have no problem with this change. (Thanks to Joe
    > > Perches for the suggestion.)
    > OK, so what applications did this patch just break?

    I'm not aware of any breakage as a result of this yet.


    Kees Cook
    Ubuntu Security Team

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