linux-kernel - Re: [PATCH v2] x86_64, vmcoreinfo: Append 'page_offset

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Date:   Wed, 28 Nov 2018 09:56:24 +0530
From:   Bhupesh Sharma <bhsharma@...hat.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     Kees Cook <keescook@...omium.org>, Borislav Petkov <bp@...en8.de>,
        Kazuhito Hagio <k-hagio@...jp.nec.com>, x86@...nel.org,
        kexec mailing list <kexec@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Omar Sandoval <osandov@...com>,
        Dave Anderson <anderson@...hat.com>,
        James Morse <james.morse@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bhupesh SHARMA <bhupesh.linux@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] x86_64, vmcoreinfo: Append 'page_offset_base' to vmcoreinfo

On Wed, Nov 28, 2018 at 7:27 AM Baoquan He <bhe@...hat.com> wrote:
>
> On 11/27/18 at 04:39pm, Kees Cook wrote:
> > >> >> diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
> > >> >> index 4c8acdfdc5a7..6161d77c5bfb 100644
> > >> >> --- a/arch/x86/kernel/machine_kexec_64.c
> > >> >> +++ b/arch/x86/kernel/machine_kexec_64.c
> > >> >> @@ -356,6 +356,9 @@ void arch_crash_save_vmcoreinfo(void)
> > >> >>       VMCOREINFO_SYMBOL(init_top_pgt);
> > >> >>       vmcoreinfo_append_str("NUMBER(pgtable_l5_enabled)=%d\n",
> > >> >>                       pgtable_l5_enabled());
> > >> >> +#ifdef CONFIG_RANDOMIZE_BASE
> >
> > Okay, gotcha. In that case, shouldn't this be CONFIG_RANDOMIZE_MEMORY?
>
> And yes, if we only care about KASLR, it should be
> CONFIG_RANDOMIZE_MEMORY, but not CONFIG_RANDOMIZE_BASE.
>

Have you tried building the changes with 'make allmodconfig' with all
the different CONFIG options you have suggested so far?