linux-kernel - Re: [git-pull -tip V2] x86: cpu architecture debug code

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] [day] [month] [year] [list]

Message-Id: <1236931668.7865.4.camel@ht.satnam>
Date:	Fri, 13 Mar 2009 13:37:48 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git-pull -tip V2] x86: cpu architecture debug code

On Fri, 2009-03-13 at 00:34 -0700, Jeremy Fitzhardinge wrote:
> Jaswinder Singh Rajput wrote:
> >>> Complete diff:
> >>> diff --git a/arch/x86/kernel/cpu/cpu_debug.c b/arch/x86/kernel/cpu/cpu_debug.c
> >>> index 0bdf4da..08c365a 100755
> >>> --- a/arch/x86/kernel/cpu/cpu_debug.c
> >>> +++ b/arch/x86/kernel/cpu/cpu_debug.c
> >>> @@ -464,19 +464,19 @@ static void print_dt(void *seq)
> >>>  	unsigned long ldt;
> >>>  
> >>>  	/* IDT */
> >>> -	store_idt((struct desc_ptr *)&dt);
> >>> +	native_store_idt((struct desc_ptr *)&dt);
> >>>       
> >> hm, this wont work on Xen then.
> >>
> >>     
> >
> > Strange it should work for Xen, Are you getting any error.
> >
> > Xen also uses native_store_idt:
> > arch/x86/xen/enlighten.c:	.store_idt = native_store_idt,
> >   
> 
> store_idt (and the others) are not used very much, and never in any code 
> path under Xen.  They're not really meaningful in Xen, and this code 
> will probably oops if you ran it.
> 
> I guess we could do more meaningful implementations of these ops for 
> Xen, now that there's a user.
> 

cpu_debug is availabe in -tip.

Can you test it:

[jaswinder@ht linux-2.6-tip]$ cat /sys/kernel/debug/x86/cpu/cpu*/dt/dt
 IDT	: 00000000c05617ff
 GDT	: 00000000c17040ff
 LDT	: 0000000000000000
 TR	: 0000000000000080

 IDT	: 00000000c05617ff
 GDT	: 00000000c17140ff
 LDT	: 00000000fce90000
 TR	: 0000000000000080

[jaswinder@ht linux-2.6-tip]$ 


--
JSR

--
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/