linux-kernel - Re: [PATCH v2] x86/gart/kcore: Exclude GART aperture from kcore

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 23 Jan 2019 22:50:31 +0800
From:   Kairui Song <kasong@...hat.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, jbohac@...e.cz,
        adobriyan@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
        osandov@...com, Bhupesh Sharma <bhsharma@...hat.com>,
        Dave Young <dyoung@...hat.com>
Subject: Re: [PATCH v2] x86/gart/kcore: Exclude GART aperture from kcore

On Wed, Jan 23, 2019 at 10:14 PM Baoquan He <bhe@...hat.com> wrote:
>
> On 01/02/19 at 06:54pm, Kairui Song wrote:
> > diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
> > index 58176b56354e..c8a56f083419 100644
> > --- a/arch/x86/kernel/aperture_64.c
> > +++ b/arch/x86/kernel/aperture_64.c
> > @@ -14,6 +14,7 @@
> >  #define pr_fmt(fmt) "AGP: " fmt
> >
> >  #include <linux/kernel.h>
> > +#include <linux/kcore.h>
> >  #include <linux/types.h>
> >  #include <linux/init.h>
> >  #include <linux/memblock.h>
> > @@ -57,7 +58,7 @@ int fallback_aper_force __initdata;
> >
> >  int fix_aperture __initdata = 1;
> >
> > -#ifdef CONFIG_PROC_VMCORE
> > +#if defined(CONFIG_PROC_VMCORE) || defined(CONFIG_PROC_KCORE)
> >  /*
> >   * If the first kernel maps the aperture over e820 RAM, the kdump kernel will
> >   * use the same range because it will remain configured in the northbridge.
> > @@ -66,7 +67,7 @@ int fix_aperture __initdata = 1;
> >   */
> >  static unsigned long aperture_pfn_start, aperture_page_count;
> >
> > -static int gart_oldmem_pfn_is_ram(unsigned long pfn)
> > +static int gart_mem_pfn_is_ram(unsigned long pfn)
> >  {
> >       return likely((pfn < aperture_pfn_start) ||
> >                     (pfn >= aperture_pfn_start + aperture_page_count));
> > @@ -76,7 +77,12 @@ static void exclude_from_vmcore(u64 aper_base, u32 aper_order)
>
> Shouldn't this function name be changed? It's not only handling vmcore
> stuff any more, but also kcore. And this function is not excluding, but
> resgistering.
>
> Other than this, it looks good to me.
>
> Thanks
> Baoquan
>

Good suggestion, it's good to change this function name too to avoid
any misleading. This patch hasn't got any other reviews recently, I'll
update it shortly.

-- 
Best Regards,
Kairui Song