Messages in this thread | | | Date | Tue, 1 Apr 2014 15:34:02 -0700 | Subject | Re: [PATCH 2/2] ARM: mm: keep rodata non-executable | From | Kees Cook <> |
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On Mon, Mar 24, 2014 at 3:47 AM, Jon Medhurst (Tixy) <tixy@linaro.org> wrote: > On Sun, 2014-03-23 at 16:21 -0600, Kees Cook wrote: >> For this stage, how about I make this "depends on KEXEC=n && >> KPROBES=n"? > > There's also ftrace (CONFIG_DYNAMIC_FTRACE I believe) which modifies > kernel code with a call to probe_kernel_write(), which GDB uses as well. > > And grepping for the patch_text() function also shows > __arch_jump_label_transform() modifies kernel code. Not sure how and > when that gets used.
Right, so, I'm trying to fix ftrace now, and I've hit a wall. It is as if changes to the kernel text PMD aren't being noticed after the kernel is running. Does anyone know why this might be happening?
Code and details here: https://lkml.org/lkml/2014/4/1/674
-Kees
-- Kees Cook Chrome OS Security
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