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Date: Wed, 20 Apr 2011 08:58:23 +0800
From: Eugene Teo <>
CC: Petr Matousek <>,,
Subject: Re: CVE request -- kernel: proc: signedness issue
 in next_pidmap()

On 04/19/2011 07:54 PM, Petr Matousek wrote:
> "A signedness issue has been found in next_pidmap() function when the "last"
> parameter is negative as next_pidmap() just quietly accepted whatever
> "last" pid that was passed in, which is not all that safe when one of the
> users is /proc.
> Setting f_pos to negative value when accessing /proc via readdir()/getdents()
> resulted in sign extension of this value when map pointer was being
> constructed.
> This later lead to #GP because the final pointer was not canonical (x86_64)."
> References:
> Upstream commit:

Use CVE-2011-1593.

main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }

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