linux-kernel - Re: [PATCH] X.509: Fix the time validation [ver #3]

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Message-ID: <5669970A.9040507@ahsoftware.de>
Date:	Thu, 10 Dec 2015 16:15:22 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	David Howells <dhowells@...hat.com>, jmorris@...ei.org
Cc:	David Woodhouse <David.Woodhouse@...el.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] X.509: Fix the time validation [ver #3]

Am 10.12.2015 um 10:23 schrieb Alexander Holler:
> Am 12.11.2015 um 12:38 schrieb David Howells:
>> This fixes CVE-2015-5327.  It affects kernels from 4.3-rc1 onwards.
>>
>> Fix the X.509 time validation to use month number-1 when looking up the
>> number of days in that month.  Also put the month number validation
>> before
>> doing the lookup so as not to risk overrunning the array.
>
> I've just run into this with 4.3.1 (mon_len ended up with 0 because of
> the wrong index). Which means currently build stable kernels with
> signature verification might not load modules (depending on which value
> the invalid index mon_len (12) ends up with.

Just in case of, I would suggest to quickly push out 4.3.2 (only 4.3 
seems to be affected) which contains at least the patch mentioned in the 
subject (58585c1fc301a36625db41ac7078c4dd0a218d84 in mainline).

Regards,

Alexander Holler
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