linux-kernel - Re: [PATCH 2/5] x86, mpx: hook #BR exception handler to allocate bound tables

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Message-ID: <20140113103808.GC5388@pd.tnic>
Date:	Mon, 13 Jan 2014 11:38:08 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Ren Qiaowei <qiaowei.ren@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] x86, mpx: hook #BR exception handler to allocate
 bound tables

On Mon, Jan 13, 2014 at 11:17:15AM +0800, Ren Qiaowei wrote:
> Yes, I run this with lockdep enabled.

Ok, but you still are doing memory allocation in the exception handler,
AFAICT:

do_bounds
|->do_mpx_bt_fault
   |->allocate_bt
      |->sys_mmap_pgoff
         |->vm_mmap_pgoff
            |->do_mmap_pgoff
               |->mmap_region
                  |-> kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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