linux-kernel - Re: [PATCH v1.1] x86/mm/ASLR: Propagate ASLR status to kernel proper

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Message-ID: <20150402112930.GA14370@gmail.com>
Date:	Thu, 2 Apr 2015 13:29:30 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>, x86-ml <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v1.1] x86/mm/ASLR: Propagate ASLR status to kernel proper


* Borislav Petkov <bp@...en8.de> wrote:

> On Thu, Apr 02, 2015 at 01:07:13PM +0200, Ingo Molnar wrote:
> > So doesn't a 'nokaslr' boot option still make sense, to be able to 
> > debug KASLR failures and such?
> 
> That's still parsed in arch/x86/boot/compressed/aslr.c

So was this duplication dead code in essence?

> 
> > > +	if (kaslr_enabled())
> > > +		pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
> > > +			 (unsigned long)&_text - __START_KERNEL,
> > > +			 __START_KERNEL,
> > > +			 __START_KERNEL_map,
> > > +			 MODULES_VADDR-1);
> > > +	else
> > > +		pr_emerg("Kernel Offset: disabled\n");
> > 
> > Nit: curly braces for multi-line statements and so.
> 
> I guess by multi-line you mean multiple source lines...

Yeah.

Thanks,

	Ingo
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