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

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Message-ID: <56694497.9090308@ahsoftware.de>
Date:	Thu, 10 Dec 2015 10:23:35 +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>, stable@...r.kernel.org
Subject: Re: [PATCH] X.509: Fix the time validation [ver #3]

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.

Regards,

Alexander Holler

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