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Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL em

from [Alex Williamson]

[Permanent Link][Original]

To:	Tristan Gingold <tgingold@xxxxxxx>
Subject:	Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation
From:	Alex Williamson <alex.williamson@xxxxxx>
Date:	Wed, 12 Dec 2007 10:08:46 -0700
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On Wed, 2007-12-12 at 07:17 +0100, Tristan Gingold wrote:
> My latest idea on this subject:
> 
> The buffers are small: 64 bytes.  So, instead of passing a buffer address,
> return the buffer by register (using scratch register r14-r21).  The PAL
> stub can then save it to memory.  I think this approach is the simplest
> one.

   PAL_BRAND_INFO takes 128 bytes, but probably still feasible.
Interesting idea.

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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[Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Kouya Shimura Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, tgingold Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Kouya Shimura Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Alex Williamson Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Kouya Shimura Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Tristan Gingold Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Tristan Gingold Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Alex Williamson <= Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, tgingold Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Isaku Yamahata Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Isaku Yamahata Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Kouya Shimura Re: [Xen-ia64-devel] [PATCH] Fix vulnerability of copy_to_user in PAL emulation, Tristan Gingold

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