Date: Tue, 21 Apr 2009 21:29:23 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: security@...nel.org, sfrench@...ibm.com Subject: Re: CVE request? buffer overflow in CIFS in 2.6.* Marcus Meissner wrote: > On Tue, Apr 21, 2009 at 10:59:25AM +0800, Eugene Teo wrote: >> Marcus Meissner wrote: >>> On Tue, Apr 07, 2009 at 01:41:44PM +0800, Eugene Teo wrote: >>>> Hi Marcus, >>>> >>>> Marcus Meissner wrote: >>>>> Fixes a kmalloc area overflow in CIFS, number of overwritten bytes >>>>> is depending on the codepage converted to. >>>>> >>>>> The data seems to come from a remote generated reply blob even, correct >>>>> me if I am wrong. :/ >>>> Looks like it's part of the session setup. The NativeFileSystem field is >>>> part of the Tree Connect response (TCon for short). >>>> >>>>> And I wonder if "len*2" is sufficient, can't a UCS -> UTF8 conversion >>>>> generate more than 2 byte utf-8 characters for 1 ucs character? >>>> I understand that someone from your side is working on a better patch >>>> for this. Do keep us updated when it goes upstream. >>> tracked in the public bugzilla entry: >>> https://bugzilla.novell.com/show_bug.cgi?id=492282 >>> >>> and: >>> http://lists.samba.org/archive/linux-cifs-client/2009-April/004322.html ff. >>> for the cifs discussion. >> Here's an update: >> http://lkml.org/lkml/2009/4/20/21 > > Our maintainer also referenced: > > http://lists.samba.org/archive/linux-cifs-client/2009-April/004450.html > http://lists.samba.org/archive/linux-cifs-client/2009-April/004452.html > > They are already in the CIFS git tree: > http://git.kernel.org/?p=linux/kernel/git/sfrench/cifs-2.6.git;a=summary > http://git.kernel.org/?p=linux/kernel/git/sfrench/cifs-2.6.git;a=commit;h=7b0c8fcff47a885743125dd843db64af41af5a61 > http://git.kernel.org/?p=linux/kernel/git/sfrench/cifs-2.6.git;a=commit;h=968460ebd8006d55661dec0fb86712b40d71c413 As discussed with Marcus, these two are unrelated to this issue, so we will need new CVE names. I spoke to Jeff Layton about this, and it looks like there are some more in the pipeline (but unrelated to this issue), so stay tuned. Thanks, Eugene -- Eugene Teo / Red Hat Security Response Team
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