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From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Garnier <thgarnie@chromium.org>
Cc: kernel-hardening@lists.openwall.com, kristen@linux.intel.com,
	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>,
	x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v10 04/11] x86/entry/64: Adapt assembly for PIE support
Date: Thu, 5 Dec 2019 10:03:55 +0100
Message-ID: <20191205090355.GC2810@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20191205000957.112719-5-thgarnie@chromium.org>

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.

> +	pushq	%rdx		/* Save RAX */

fail..

> +	leaq	1f(%rip), %rdx	/* RIP */

nonsensical comment

> +	movq    %rdx, 8(%rsp)   /* Put 1f on return address */
> +	popq	%rdx		/* Restore RAX */

fail..

>  	iretq			/* continues at repeat_nmi below */
>  	UNWIND_HINT_IRET_REGS
>  1:
> -- 
> 2.24.0.393.g34dc348eaf-goog
> 

  reply index

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 [this message]
2019-12-05 17:01     ` Thomas Garnier
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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