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Date: Thu, 3 Sep 2020 15:03:30 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Will Deacon <will@...nel.org>,
Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Paul E. McKenney" <paulmck@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
clang-built-linux <clang-built-linux@...glegroups.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
linux-arch <linux-arch@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-kbuild <linux-kbuild@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
linux-pci@...r.kernel.org, X86 ML <x86@...nel.org>
Subject: Re: [PATCH v2 05/28] objtool: Add a pass for generating __mcount_loc
On Thu, Sep 3, 2020 at 2:51 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Thu, Sep 03, 2020 at 01:30:30PM -0700, Sami Tolvanen wrote:
> > From: Peter Zijlstra <peterz@...radead.org>
> >
> > Add the --mcount option for generating __mcount_loc sections
> > needed for dynamic ftrace. Using this pass requires the kernel to
> > be compiled with -mfentry and CC_USING_NOP_MCOUNT to be defined
> > in Makefile.
> >
> > Link: https://lore.kernel.org/lkml/20200625200235.GQ4781@hirez.programming.kicks-ass.net/
> > Signed-off-by: Peter Zijlstra <peterz@...radead.org>
>
> Hmm, I'm not sure why this hasn't gotten picked up yet. Is this expected
> to go through -tip or something else?
Note that I picked up this patch from Peter's original email, to which
I included a link in the commit message, but it wasn't officially
submitted as a patch. However, the previous discussion seems to have
died, so I included the patch in this series, as it cleanly solves the
problem of whitelisting non-call references to __fentry__. I was
hoping for Peter and Steven to comment on how they prefer to proceed
here.
Sami
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