From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: "Thomas Garnier" <thgarnie@google.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>,
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Subject: [kernel-hardening] Re: [PATCH v2 3/3] x86: Make the GDT remapping read-only on 64 bit
Date: Thu, 2 Feb 2017 08:12:25 +0100 [thread overview]
Message-ID: <20170202071225.GB2368@gmail.com> (raw)
In-Reply-To: <CALCETrU_WPm+HonkiRtaO0kTTqkfAcyhANp22yPGiSAPkNsRGQ@mail.gmail.com>
* Andy Lutomirski <luto@kernel.org> wrote:
> On Wed, Feb 1, 2017 at 1:15 AM, Ingo Molnar <mingo@kernel.org> wrote:
> >
> > * Thomas Garnier <thgarnie@google.com> wrote:
> >
> >> This patch makes the GDT remapped pages read-only to prevent corruption.
> >> This change is done only on 64 bit.
> >
>
>
> >>
> >> - table_base = gdt->address;
> >> + table_base = (unsigned long)get_current_direct_gdt();
> >
> > Instead of spreading these type casts far and wide please introduce another
> > accessor the returns 'unsigned long':
> >
> > get_cpu_gdt_rw_vaddr()
> >
>
> That whole function is an abomination. How about replacing 'unsigned
> long table_base' with 'struct desc_struct *table'? If you're feeling
> really adventurous, *delete* that function and replace all of its
> users with something sane.
Yeah, even better!
Thanks,
Ingo
WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: Thomas Garnier <thgarnie@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Kees Cook <keescook@chromium.org>,
Arjan van de Ven <arjan@linux.intel.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Borislav Petkov <bp@suse.de>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Jiri Kosina <jikos@kernel.org>,
Matt Fleming <matt@codeblueprint.co.uk>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Fenghua Yu <fenghua.yu@intel.com>,
He Chen <he.chen@linux.intel.com>Br
Subject: Re: [PATCH v2 3/3] x86: Make the GDT remapping read-only on 64 bit
Date: Thu, 2 Feb 2017 08:12:25 +0100 [thread overview]
Message-ID: <20170202071225.GB2368@gmail.com> (raw)
In-Reply-To: <CALCETrU_WPm+HonkiRtaO0kTTqkfAcyhANp22yPGiSAPkNsRGQ@mail.gmail.com>
* Andy Lutomirski <luto@kernel.org> wrote:
> On Wed, Feb 1, 2017 at 1:15 AM, Ingo Molnar <mingo@kernel.org> wrote:
> >
> > * Thomas Garnier <thgarnie@google.com> wrote:
> >
> >> This patch makes the GDT remapped pages read-only to prevent corruption.
> >> This change is done only on 64 bit.
> >
>
>
> >>
> >> - table_base = gdt->address;
> >> + table_base = (unsigned long)get_current_direct_gdt();
> >
> > Instead of spreading these type casts far and wide please introduce another
> > accessor the returns 'unsigned long':
> >
> > get_cpu_gdt_rw_vaddr()
> >
>
> That whole function is an abomination. How about replacing 'unsigned
> long table_base' with 'struct desc_struct *table'? If you're feeling
> really adventurous, *delete* that function and replace all of its
> users with something sane.
Yeah, even better!
Thanks,
Ingo
WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: Thomas Garnier <thgarnie@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Kees Cook <keescook@chromium.org>,
Arjan van de Ven <arjan@linux.intel.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Borislav Petkov <bp@suse.de>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Jiri Kosina <jikos@kernel.org>,
Matt Fleming <matt@codeblueprint.co.uk>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Fenghua Yu <fenghua.yu@intel.com>,
He Chen <he.chen@linux.intel.com>,
Br
Subject: Re: [PATCH v2 3/3] x86: Make the GDT remapping read-only on 64 bit
Date: Thu, 2 Feb 2017 08:12:25 +0100 [thread overview]
Message-ID: <20170202071225.GB2368@gmail.com> (raw)
In-Reply-To: <CALCETrU_WPm+HonkiRtaO0kTTqkfAcyhANp22yPGiSAPkNsRGQ@mail.gmail.com>
* Andy Lutomirski <luto@kernel.org> wrote:
> On Wed, Feb 1, 2017 at 1:15 AM, Ingo Molnar <mingo@kernel.org> wrote:
> >
> > * Thomas Garnier <thgarnie@google.com> wrote:
> >
> >> This patch makes the GDT remapped pages read-only to prevent corruption.
> >> This change is done only on 64 bit.
> >
>
>
> >>
> >> - table_base = gdt->address;
> >> + table_base = (unsigned long)get_current_direct_gdt();
> >
> > Instead of spreading these type casts far and wide please introduce another
> > accessor the returns 'unsigned long':
> >
> > get_cpu_gdt_rw_vaddr()
> >
>
> That whole function is an abomination. How about replacing 'unsigned
> long table_base' with 'struct desc_struct *table'? If you're feeling
> really adventurous, *delete* that function and replace all of its
> users with something sane.
Yeah, even better!
Thanks,
Ingo
next prev parent reply other threads:[~2017-02-02 7:12 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-26 16:59 [kernel-hardening] [PATCH v2 1/3] x86/mm: Adapt MODULES_END based on Fixmap section size Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 16:59 ` [PATCH v2 2/3] x86: Remap GDT tables in the Fixmap section Thomas Garnier
2017-01-26 16:59 ` [kernel-hardening] " Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 18:52 ` [kernel-hardening] " Andy Lutomirski
2017-01-26 18:52 ` Andy Lutomirski
2017-01-26 19:10 ` Thomas Garnier
2017-01-26 19:10 ` [kernel-hardening] " Thomas Garnier
2017-01-26 19:10 ` Thomas Garnier
2017-01-26 18:52 ` Andy Lutomirski
2017-01-26 16:59 ` [PATCH v2 3/3] x86: Make the GDT remapping read-only on 64 bit Thomas Garnier
2017-01-26 16:59 ` [kernel-hardening] " Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-01-26 16:59 ` Thomas Garnier
2017-02-01 9:15 ` [kernel-hardening] " Ingo Molnar
2017-02-01 9:15 ` Ingo Molnar
2017-02-01 9:15 ` Ingo Molnar
2017-02-02 5:13 ` [kernel-hardening] " Andy Lutomirski
2017-02-02 5:13 ` Andy Lutomirski
2017-02-02 5:13 ` Andy Lutomirski
2017-02-02 7:12 ` Ingo Molnar
2017-02-02 7:12 ` Ingo Molnar [this message]
2017-02-02 7:12 ` Ingo Molnar
2017-02-02 7:12 ` Ingo Molnar
2017-02-02 5:13 ` Andy Lutomirski
2017-02-01 9:15 ` Ingo Molnar
2017-02-02 5:14 ` Andy Lutomirski
2017-02-02 5:14 ` [kernel-hardening] " Andy Lutomirski
2017-02-02 5:14 ` Andy Lutomirski
2017-02-06 22:10 ` [kernel-hardening] " Thomas Garnier
2017-02-06 22:10 ` Thomas Garnier
2017-02-06 22:10 ` Thomas Garnier
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