linux-kernel - Re: [PATCH v2 1/2] staging: gs_fpgaboot: add buffer overflow checks

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Date:   Tue, 18 Jul 2017 09:00:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jacob von Chorus <jacobvonchorus@...hoto.ca>
Cc:     Insop Song <insop.song@...nspeed.com>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, dan.carpenter@...cle.com
Subject: Re: [PATCH v2 1/2] staging: gs_fpgaboot: add buffer overflow checks

On Mon, Jul 17, 2017 at 08:47:25PM -0400, Jacob von Chorus wrote:
> Four fields in struct fpgaimage are char arrays of length MAX_STR (256).
> The amount of data read into these buffers is controlled by a length
> field in the bitstream file read from userspace. If a corrupt or
> malicious firmware file was supplied, kernel data beyond these buffers
> can be overwritten arbitrarily.
> 
> This patch adds a check of the bitstream's length value to ensure it
> fits within the bounds of the allocated buffers. An error condition is
> returned from gs_read_bitstream if any of the reads fail.
> 
> Signed-off-by: Jacob von Chorus <jacobvonchorus@...hoto.ca>
> ---
>  drivers/staging/gs_fpgaboot/gs_fpgaboot.c | 48 ++++++++++++++++++++++++-------
>  1 file changed, 37 insertions(+), 11 deletions(-)

What changed from v1?  Always list that below the --- line.

Please fix up and resend...

thanks,

greg k-h