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SubjectRe: [announce] [patch] NX (No eXecute) support for x86, 2.6.7-rc2-bk2

* Rusty Russell <rusty@rustcorp.com.au> wrote:

> You want to replace the arch-specific module_alloc() function for
> this. Or even better, reset the NX bit only on executable sections (in
> the arch-specific module_finalize(), using mod->core_text_size and
> mod->init_text_size). No generic changes necessary.

this reminds me of another issue: x86_64 currently seems to manually map
the whole module via PAGE_KERNEL_EXEC. Andi, we could change it to use
vmalloc_exec(), right?

and yet another sub-topic: when building modules we should align .rodata
(the first non-executable section) to page boundary. This adds ~2K to
the module size but it's not an issue i think. Data section overflows do
happen and if it has a function pointer that can be used as a trampoline
then we want the whole data section to be non-executable.

Ingo
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