linux-kernel - Re: [PATCH v3] ipr: fix out-of-bounds null overwrite

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Date:	Thu, 07 Jan 2016 21:52:18 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Insu Yun <wuninsu@...il.com>
Cc:	brking@...ibm.com, JBottomley@...n.com, martin.petersen@...cle.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	changwoo@...ech.edu, Shane Seymour <shane.seymour@....com>
Subject: Re: [PATCH v3] ipr: fix out-of-bounds null overwrite

>>>>> "Insu" == Insu Yun <wuninsu@...il.com> writes:

Insu> Return value of snprintf is not bound by size value, 2nd argument.
Insu> (https://www.kernel.org/doc/htmldocs/kernel-api/API-snprintf.html).
Insu> Return value is number of printed chars, can be larger than 2nd
Insu> argument.  Therefore, it can write null byte out of bounds
Insu> ofbuffer.  Since snprintf puts null, it does not need to put
Insu> additional null byte.

Applied to 4.5/scsi-queue.

-- 
Martin K. Petersen	Oracle Linux Engineering