linux-kernel - Re: [PATCH] x86-64: add unwind annotations to early_idt

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]

Message-ID: <20090312105345.GB30204@elte.hu>
Date:	Thu, 12 Mar 2009 11:53:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Beulich <jbeulich@...ell.com>
Cc:	tglx@...utronix.de, hpa@...or.com,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>
Subject: Re: [PATCH] x86-64: add unwind annotations to early_idt_handler


* Jan Beulich <jbeulich@...ell.com> wrote:

> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> Cc: Andi Kleen <andi@...stfloor.org>
> 
> ---
>  arch/x86/kernel/head_64.S |   13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> --- linux-2.6.29-rc7/arch/x86/kernel/head_64.S	2009-03-11 17:52:10.000000000 +0100
> +++ 2.6.29-rc7-x86_64-unwind-early_idt_handler/arch/x86/kernel/head_64.S	2009-02-18 13:38:09.000000000 +0100
> @@ -280,6 +280,8 @@ early_idt_handlers:
>  
>  ENTRY(early_idt_handler)
>  #ifdef CONFIG_EARLY_PRINTK
> +#include <asm/calling.h>
> +#include <asm/dwarf2.h>
>  	cmpl $2,early_recursion_flag(%rip)
>  	jz  1f
>  	incl early_recursion_flag(%rip)
> @@ -295,6 +297,16 @@ ENTRY(early_idt_handler)
>  	testl $0x27d00,%eax
>  	je 0f
>  	popq %r8		# get error code
> +
> +	CFI_STARTPROC	simple
> +	CFI_SIGNAL_FRAME
> +	CFI_DEF_CFA	rsp, SS+8-RIP
> +#	CFI_REL_OFFSET	ss, SS-RIP
> +	CFI_REL_OFFSET	rsp, RSP-RIP
> +#	CFI_REL_OFFSET	rflags, EFLAGS-RIP
> +#	CFI_REL_OFFSET	cs, CS-RIP
> +	CFI_REL_OFFSET	rip, RIP-RIP
> +

This too is too ugly - there should be a structured macro that 
expresses this - instead of open-coded CFI details. This is a 
regular x86 entry layout with a lot of commonalities with other 
entry points.

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/