linux-kernel - Re: [PATCH 4.14 17/89] futex: Prevent overflow by strengthen input validation

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Message-ID: <e08b3b53-9459-35e9-c119-047745603d49@suse.cz>
Date:   Thu, 25 Jan 2018 15:47:32 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Li Jinyue <lijinyue@...wei.com>, peterz@...radead.org,
        dvhart@...radead.org,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4.14 17/89] futex: Prevent overflow by strengthen input
 validation

On 01/25/2018, 03:30 PM, Thomas Gleixner wrote:
> So what's the problem?

The problem I see is that every stable kernel now requires updated
strace with their commit from yesterday to build correctly. In
particular, the new stable kernels cause rpm build failures of strace in
all our distros (based on those stable kernels). Sure, we can patch
strace in every distro every nth kernel update, but it's mere
impractical. Kernel should not break userspace, right?

BTW why was the patch applied to stable? We actually do pass
-fno-strict-overflow.

thanks,
-- 
js
suse labs