From: Thomas Garnier <thgarnie@chromium.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>,
Kristen Carlson Accardi <kristen@linux.intel.com>,
Kees Cook <keescook@chromium.org>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"the arch/x86 maintainers" <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v10 04/11] x86/entry/64: Adapt assembly for PIE support
Date: Thu, 5 Dec 2019 09:01:50 -0800 [thread overview]
Message-ID: <CAJcbSZF+vGE6ZseiQfcis2NMcimmpwvov_P-tZe--z5UxJPDdg@mail.gmail.com> (raw)
In-Reply-To: <20191205090355.GC2810@hirez.programming.kicks-ass.net>
On Thu, Dec 5, 2019 at 1:04 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Wed, Dec 04, 2019 at 04:09:41PM -0800, Thomas Garnier wrote:
>
> > @@ -1625,7 +1627,11 @@ first_nmi:
> > addq $8, (%rsp) /* Fix up RSP */
> > pushfq /* RFLAGS */
> > pushq $__KERNEL_CS /* CS */
> > - pushq $1f /* RIP */
> > + pushq $0 /* Future return address */
>
> We're building an IRET frame, the IRET frame does not have a 'future
> return address' field.
I assumed that's the target RIP after iretq.
>
> > + pushq %rdx /* Save RAX */
>
> fail..
Yes, sorry. I was asked to switch from RAX to RDX and missed the comment.
>
> > + leaq 1f(%rip), %rdx /* RIP */
>
> nonsensical comment
That was the same comment from the push $1f that I changed.
>
> > + movq %rdx, 8(%rsp) /* Put 1f on return address */
> > + popq %rdx /* Restore RAX */
>
> fail..
I will change in next iteration.
>
> > iretq /* continues at repeat_nmi below */
> > UNWIND_HINT_IRET_REGS
> > 1:
> > --
> > 2.24.0.393.g34dc348eaf-goog
> >
next prev parent reply other threads:[~2019-12-05 17:02 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-05 0:09 [PATCH v10 00/11] x86: PIE support to extend KASLR randomization Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 01/11] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2019-12-18 12:46 ` Borislav Petkov
2019-12-18 16:35 ` Thomas Garnier
2019-12-18 16:45 ` Borislav Petkov
2019-12-05 0:09 ` [PATCH v10 02/11] x86: Add macro to get symbol address " Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 03/11] x86: relocate_kernel - Adapt assembly " Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 04/11] x86/entry/64: " Thomas Garnier
2019-12-05 9:03 ` Peter Zijlstra
2019-12-05 17:01 ` Thomas Garnier [this message]
2019-12-06 10:26 ` Peter Zijlstra
2019-12-06 16:35 ` Thomas Garnier
2019-12-20 16:05 ` Borislav Petkov
2019-12-05 0:09 ` [PATCH v10 05/11] x86: pm-trace - " Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 06/11] x86/CPU: " Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 07/11] x86/acpi: " Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 08/11] x86/boot/64: " Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 09/11] x86/power/64: " Thomas Garnier
2019-12-05 0:09 ` [PATCH v10 10/11] x86/paravirt: " Thomas Garnier
2019-12-23 17:23 ` Borislav Petkov
2019-12-24 10:04 ` Borislav Petkov
2019-12-05 0:09 ` [PATCH v10 11/11] x86/alternatives: " Thomas Garnier
2019-12-19 13:34 ` [PATCH v10 00/11] x86: PIE support to extend KASLR randomization Peter Zijlstra
2019-12-19 16:35 ` Thomas Garnier
2019-12-24 13:03 ` Borislav Petkov
2019-12-30 18:52 ` Kees Cook
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