linux-kernel - Re: [PATCH v3 06/13] mm/execmem: introduce execmem_data

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Message-ID: <CAPhsuW4_3oYhN6LnPPyBVA4VAM=7voXKmcJNKLqiNEUboq1rnA@mail.gmail.com>
Date:   Fri, 22 Sep 2023 01:55:29 -0700
From:   Song Liu <song@...nel.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Mike Rapoport <rppt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Björn Töpel <bjorn@...nel.org>,
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        Mark Rutland <mark.rutland@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nadav Amit <nadav.amit@...il.com>,
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Subject: Re: [PATCH v3 06/13] mm/execmem: introduce execmem_data_alloc()

On Fri, Sep 22, 2023 at 12:17 AM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
>
>
>
> Le 22/09/2023 à 00:52, Song Liu a écrit :
> > On Mon, Sep 18, 2023 at 12:31 AM Mike Rapoport <rppt@...nel.org> wrote:
> >>
> > [...]
> >> diff --git a/include/linux/execmem.h b/include/linux/execmem.h
> >> index 519bdfdca595..09d45ac786e9 100644
> >> --- a/include/linux/execmem.h
> >> +++ b/include/linux/execmem.h
> >> @@ -29,6 +29,7 @@
> >>    * @EXECMEM_KPROBES: parameters for kprobes
> >>    * @EXECMEM_FTRACE: parameters for ftrace
> >>    * @EXECMEM_BPF: parameters for BPF
> >> + * @EXECMEM_MODULE_DATA: parameters for module data sections
> >>    * @EXECMEM_TYPE_MAX:
> >>    */
> >>   enum execmem_type {
> >> @@ -37,6 +38,7 @@ enum execmem_type {
> >>          EXECMEM_KPROBES,
> >>          EXECMEM_FTRACE,
> >
> > In longer term, I think we can improve the JITed code and merge
> > kprobe/ftrace/bpf. to use the same ranges. Also, do we need special
> > setting for FTRACE? If not, let's just remove it.
>
> How can we do that ? Some platforms like powerpc require executable
> memory for BPF and non-exec mem for KPROBE so it can't be in the same
> area/ranges.

Hmm... non-exec mem for kprobes?

       if (strict_module_rwx_enabled())
               execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX;
       else
               execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_EXEC;

Do you mean the latter case?

Thanks,
Song