linux-kernel - Re: [PATCH] kernel/sys.c: Fix UNAME26 for 4.0

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Date:	Mon, 23 Feb 2015 20:05:12 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jon DeVree <nuxi@...lt24.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] kernel/sys.c: Fix UNAME26 for 4.0

On Mon, Feb 23, 2015 at 11:00:41AM -0800, Andrew Morton wrote:
> On Mon, 23 Feb 2015 00:43:12 -0500 Jon DeVree <nuxi@...lt24.org> wrote:
> 
> > --- a/kernel/sys.c
> > +++ b/kernel/sys.c
> > @@ -1127,7 +1127,7 @@ static int override_release(char __user *release, size_t len)
> >  				break;
> >  			rest++;
> >  		}
> > -		v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
> > +		v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60;
> >  		copy = clamp_t(size_t, len, 1, sizeof(buf));
> >  		copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
> >  		ret = copy_to_user(release, buf, copy + 1);
> 
> Huh.
> 
> I wonder if we still need this.

I think so. A lot of the world is still stuck on RHEL6 ...
And compatbility to old binaries is a high value.

The original program I needed it for is fixed however.

-Andi

> 
> 
> 
> We should update the comment:
> 
> --- a/kernel/sys.c~kernel-sysc-fix-uname26-for-40-fix
> +++ a/kernel/sys.c
> @@ -1108,6 +1108,7 @@ DECLARE_RWSEM(uts_sem);
>  /*
>   * Work around broken programs that cannot handle "Linux 3.0".
>   * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
> + * And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60.
>   */
>  static int override_release(char __user *release, size_t len)
>  {
> 

-- 
ak@...ux.intel.com -- Speaking for myself only.
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