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    SubjectRe: [syzbot] KFENCE: use-after-free in kvm_fastop_exception
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    On 18/08/2021 10:55, Pavel Skripkin wrote:
    > On 8/18/21 11:21 AM, Matthieu Baerts wrote:
    >> Hi Pavel,
    >>
    > [snip]
    >>>>
    >>>> I'm pretty sure the commit c4512c63b119 ("mptcp: fix 'masking a bool'
    >>>> warning") doesn't introduce the reported bug. This minor fix is
    >>>> specific
    >>>> to MPTCP which doesn't seem to be used here.
    >>>>
    >>>> I'm not sure how I can tell syzbot this is a false positive.
    >>>>
    >>>
    >>>
    >>> looks like it's fs/namei bug. Similar reports:
    >>>
    >>> https://syzkaller.appspot.com/bug?id=517fa734b92b7db404c409b924cf5c997640e324
    >>>
    >>>
    >>>
    >>> https://syzkaller.appspot.com/bug?id=484483daf3652b40dae18531923aa9175d392a4d
    >>>
    >>
    >> Thank you for having checked!
    >> Should we mark them as "#syz dup" if you think they have the same root
    >> cause?
    >>
    >
    > I think, yes, but I want to receive feedback from fs people about this
    > bug. There were huge updates last month, and, maybe, I am missing some
    > details. Alloc/free calltrace is the same, but anyway, I want some
    > confirmation to not close different bugs by mistake :)
    >
    > If these bugs really have same root case I will close them manually
    > after fix posted.

    Thank you for the explanation. Sounds good to me!

    Cheers,
    Matt
    --
    Tessares | Belgium | Hybrid Access Solutions
    www.tessares.net

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