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SubjectRe: [PATCH v2] module: Harden STRICT_MODULE_RWX
Em Tue, 11 Aug 2020 16:55:24 +0200
peterz@infradead.org escreveu:

> On Tue, Aug 11, 2020 at 04:34:27PM +0200, Mauro Carvalho Chehab wrote:
> > [33] .plt PROGBITS 0000000000000340 00035c80
> > 0000000000000001 0000000000000000 WAX 0 0 1
> > [34] .init.plt NOBITS 0000000000000341 00035c81
> > 0000000000000001 0000000000000000 WA 0 0 1
> > [35] .text.ftrace[...] PROGBITS 0000000000000342 00035c81
> > 0000000000000001 0000000000000000 WAX 0 0 1
>
> .plt and .text.ftrace_tramplines are buggered.
>
> arch/arm64/kernel/module.lds even marks then as NOLOAD.

Hmm... Shouldn't the code at module_enforce_rwx_sections() or at
load_module() ignore such sections instead of just rejecting probing
all modules?

I mean, if the existing toolchain is not capable of excluding
those sections, either the STRICT_MODULE_RWX hardening should be
disabled, if a broken toolchain is detected or some runtime code
should handle such sections on a different way.

Thanks,
Mauro

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