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Date: Fri, 16 Oct 2015 11:24:53 +0200
From: Florian Weimer <fweimer@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request: Linux Kernel heap corruption on
 debug_read_tlb

On 10/15/2015 03:53 PM, Greg KH wrote:
> On Thu, Oct 15, 2015 at 10:30:04AM +0200, Salva Peiró wrote:
>> Hello,
>>
>> Is there a CVE for this? If not, could one be assigned, please?
>>
>>      https://patchwork.kernel.org/patch/6853351/
>>      commit e203db293863fa15b4b1917d4398fb5bd63c4e88
>>      iommu/omap: Fix debug_read_tlb() to use seq_printf()
>>
>>      The debug_read_tlb() uses the sprintf() functions directly on the
>> buffer
>>      allocated by buf = kmalloc(count), without taking into account the size
>>      of the buffer, with the consequence corrupting the heap, depending on
>>      the count requested by the user.
>>
>>      The patch fixes the issue replacing sprintf() by seq_printf().
> 
> For a root-only-readable file?  Why is a CVE needed?

Fedora and downstreams do not system-level access to the root user by
default, as a result of the custom Secure Boot patches.  This does not
matter for pure denial-of-service bugs of course, but this bug looks
like something that might allow code execution.

Florian

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