From: Greg Kroah-Hartman <gregkh@linuxfoundation•org>
To: Jiri Slaby <jslaby@suse•cz>
Cc: linux-kernel@vger•kernel.org, stable@vger•kernel.org,
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Subject: Re: [PATCH 4.9 27/33] futex: Remove duplicated code and fix undefined behaviour
Date: Fri, 18 May 2018 11:01:41 +0200 [thread overview]
Message-ID: <20180518090141.GA10227@kroah.com> (raw)
In-Reply-To: <e8dc5f94-3b52-dcf0-3b5e-b442bde7d803@suse.cz>
On Fri, May 18, 2018 at 10:30:24AM +0200, Jiri Slaby wrote:
> On 05/18/2018, 10:16 AM, Greg Kroah-Hartman wrote:
> > 4.9-stable review patch. If anyone has any objections, please let me know.
> >
> > ------------------
> >
> > From: Jiri Slaby <jslaby@suse•cz>
> >
> > commit 30d6e0a4190d37740e9447e4e4815f06992dd8c3 upstream.
> ...
> > --- a/kernel/futex.c
> > +++ b/kernel/futex.c
> > @@ -1458,6 +1458,45 @@ out:
> > return ret;
> > }
> >
> > +static int futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr)
> > +{
> > + unsigned int op = (encoded_op & 0x70000000) >> 28;
> > + unsigned int cmp = (encoded_op & 0x0f000000) >> 24;
> > + int oparg = sign_extend32((encoded_op & 0x00fff000) >> 12, 12);
> > + int cmparg = sign_extend32(encoded_op & 0x00000fff, 12);
>
> 12 is wrong here – wherever you apply this, you need also a follow-up fix:
> commit d70ef22892ed6c066e51e118b225923c9b74af34
> Author: Jiri Slaby <jslaby@suse•cz>
> Date: Thu Nov 30 15:35:44 2017 +0100
>
> futex: futex_wake_op, fix sign_extend32 sign bits
Thanks for letting me know, I've now queued it up to the needed trees.
greg k-h
prev parent reply other threads:[~2018-05-18 9:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180518081535.096308218@linuxfoundation.org>
2018-05-18 8:16 ` [PATCH 4.9 27/33] futex: Remove duplicated code and fix undefined behaviour Greg Kroah-Hartman
2018-05-18 8:30 ` Jiri Slaby
2018-05-18 9:01 ` Greg Kroah-Hartman [this message]
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