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    SubjectRe: [PATCH 4.14 17/89] futex: Prevent overflow by strengthen input validation
    On Thu, Jan 25, 2018 at 03:47:32PM +0100, Jiri Slaby wrote:
    > 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?

    Well, when userspace is doing something stupid... :)

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

    The same reason it was applied upstream, it fixes a reported
    issue.

    Does that mean that all UBSAN overflow error reports are not valid
    because of how we build the kernel?

    thanks,

    greg k-h

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