From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Felipe Balbi <balbi@kernel.org>
Cc: "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: usb: gadget: storage: Fix Spectre v1 vulnerability
Date: Tue, 16 Oct 2018 13:34:21 +0200 [thread overview]
Message-ID: <20181016113421.GA21169@kroah.com> (raw)
On Tue, Oct 16, 2018 at 02:28:19PM +0300, Felipe Balbi wrote:
>
> Hi Greg,
>
> "Gustavo A. R. Silva" <gustavo@embeddedor.com> writes:
>
> > num can be indirectly controlled by user-space, hence leading to
> > a potential exploitation of the Spectre variant 1 vulnerability.
> >
> > This issue was detected with the help of Smatch:
> >
> > drivers/usb/gadget/function/f_mass_storage.c:3177 fsg_lun_make() warn:
> > potential spectre issue 'fsg_opts->common->luns' [r] (local cap)
> >
> > Fix this by sanitizing num before using it to index
> > fsg_opts->common->luns
> >
> > Notice that given that speculation windows are large, the policy is
> > to kill the speculation on the first load and not worry if it can be
> > completed with a dependent load/store [1].
> >
> > [1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2
> >
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>
> Can you still take this as an urgent fix?
>
> Acked-by: Felipe Balbi <felipe.balbi@intel.com>
Yes, will do so, thanks.
greg k-h
>
> --
> balbi
WARNING: multiple messages have this Message-ID (diff)
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Felipe Balbi <balbi@kernel.org>
Cc: "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] usb: gadget: storage: Fix Spectre v1 vulnerability
Date: Tue, 16 Oct 2018 13:34:21 +0200 [thread overview]
Message-ID: <20181016113421.GA21169@kroah.com> (raw)
In-Reply-To: <8736t6p1v0.fsf@linux.intel.com>
On Tue, Oct 16, 2018 at 02:28:19PM +0300, Felipe Balbi wrote:
>
> Hi Greg,
>
> "Gustavo A. R. Silva" <gustavo@embeddedor.com> writes:
>
> > num can be indirectly controlled by user-space, hence leading to
> > a potential exploitation of the Spectre variant 1 vulnerability.
> >
> > This issue was detected with the help of Smatch:
> >
> > drivers/usb/gadget/function/f_mass_storage.c:3177 fsg_lun_make() warn:
> > potential spectre issue 'fsg_opts->common->luns' [r] (local cap)
> >
> > Fix this by sanitizing num before using it to index
> > fsg_opts->common->luns
> >
> > Notice that given that speculation windows are large, the policy is
> > to kill the speculation on the first load and not worry if it can be
> > completed with a dependent load/store [1].
> >
> > [1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2
> >
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>
> Can you still take this as an urgent fix?
>
> Acked-by: Felipe Balbi <felipe.balbi@intel.com>
Yes, will do so, thanks.
greg k-h
>
> --
> balbi
next reply other threads:[~2018-10-16 11:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 11:34 Greg Kroah-Hartman [this message]
2018-10-16 11:34 ` [PATCH] usb: gadget: storage: Fix Spectre v1 vulnerability Greg Kroah-Hartman
-- strict thread matches above, loose matches on Subject: below --
2018-10-16 11:28 Felipe Balbi
2018-10-16 11:28 ` [PATCH] " Felipe Balbi
2018-10-16 10:16 Gustavo A. R. Silva
2018-10-16 10:16 ` [PATCH] " Gustavo A. R. Silva
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