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oss-security: Re: [oss-security] CVE request: kernel: btrfs heap

Re: [oss-security] CVE request: kernel: btrfs heap overflow

From: Eugene Teo <eugene_at_nospam>
Date: Wed Feb 09 2011 - 16:01:39 GMT
To: oss-security@lists.openwall.com

On 02/09/2011 11:49 PM, Dan Rosenberg wrote:
> I'm not aware of any distributions that support 2.6.37 kernels, but as
> far as I know this doesn't affect CVE eligibility (please correct me
> if I'm wrong).

Ok, I'm just asking. Please use CVE-2011-0696.


> On Wed, Feb 9, 2011 at 10:20 AM, Eugene Teo<eugene@redhat.com> wrote:
>> On 02/09/2011 10:27 PM, Dan Rosenberg wrote:
>>> Commit bf5fc093c5b625e4259203f1cee7ca73488a5620 refactored
>>> btrfs_ioctl_space_info() and introduced security issues. Since they
>>> were all introduced at once and fixed at the same time, one CVE should
>>> suffice.
>>> Due to integer truncation or a signedness error in a typecasted
>>> comparison, an integer overflow in an allocation size calculation, and
>>> a failure to properly check bounds when copying data, it was possible
>>> for an unprivileged user to cause a denial-of-service due to writing
>>> to an invalid pointer (ZERO_SIZE_PTR) or cause a kernel heap overflow.
>>> -Dan
>>> [1] http://marc.info/?l=linux-kernel&m=129726078708425&w=2
>> Commit bf5fc093c was introduced very recently - v2.6.37-rc1 Sept last year.
>> Do we have commercially supported kernels that are affected by this?
>> Thanks, Eugene