linux-kernel - RE: [Revised PATCH v2] hv: kvp: Avoid reading past allocated blocks from KVP file

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Date:   Wed, 8 Nov 2017 18:34:37 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Haiyang Zhang <haiyangz@...rosoft.com>,
        Long Li <longli@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Paul Meyer <Paul.Meyer@...rosoft.com>,
        Long Li <longli@...rosoft.com>
Subject: RE: [Revised PATCH v2] hv: kvp: Avoid reading past allocated blocks
 from KVP file



> -----Original Message-----
> From: Haiyang Zhang
> Sent: Wednesday, November 8, 2017 6:22 AM
> To: Long Li <longli@...rosoft.com>; KY Srinivasan <kys@...rosoft.com>;
> Stephen Hemminger <sthemmin@...rosoft.com>;
> devel@...uxdriverproject.org; linux-kernel@...r.kernel.org
> Cc: Paul Meyer <Paul.Meyer@...rosoft.com>; Long Li
> <longli@...rosoft.com>
> Subject: RE: [Revised PATCH v2] hv: kvp: Avoid reading past allocated blocks
> from KVP file
> 
> 
> 
> > -----Original Message-----
> > From: Long Li [mailto:longli@...hange.microsoft.com]
> > Sent: Wednesday, November 1, 2017 2:45 PM
> > To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> > <haiyangz@...rosoft.com>; Stephen Hemminger
> > <sthemmin@...rosoft.com>; devel@...uxdriverproject.org; linux-
> > kernel@...r.kernel.org
> > Cc: Paul Meyer <Paul.Meyer@...rosoft.com>; Long Li
> > <longli@...rosoft.com>
> > Subject: [Revised PATCH v2] hv: kvp: Avoid reading past allocated blocks
> > from KVP file
> >
> > [This sender failed our fraud detection checks and may not be who they
> > appear to be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing]
> >
> > From: Paul Meyer <Paul.Meyer@...rosoft.com>
> >
> > While reading in more than one block (50) of KVP records, the allocation
> > goes per block, but the reads used the total number of allocated records
> > (without resetting the pointer/stream). This causes the records buffer to
> > overrun when the refresh reads more than one block over the previous
> > capacity (e.g. reading more than 100 KVP records whereas the in-memory
> > database was empty before).
> >
> > Fix this by reading the correct number of KVP records from file each time.
> >
> > Changes since v1:
> > 1. Properly wrapped comment texts.
> > 2. Added the 2nd Signed-off-by.
> >
> > Signed-off-by: Paul Meyer <Paul.Meyer@...rosoft.com>
> > Signed-off-by: Long Li <longli@...rosoft.com>
> 
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>

I will take this patch.

K. Y