From: "Kurt Manucredo" <fuzzybritches0@gmail.com>
To: gregkh@linuxfoundation.org
Cc: linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [PATCH v2] bpf: core: fix shift-out-of-bounds in ___bpf_prog_run
Date: Tue, 01 Jun 2021 23:28:00 +0200 [thread overview]
Message-ID: <16463-26867-curtm@phaethon> (raw)
In-Reply-To: <YLZVnNNAkAQFvSm8@kroah.com>
On Tue, 1 Jun 2021 17:43:24 +0200, Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Tue, Jun 01, 2021 at 04:33:09PM +0200, Kurt Manucredo wrote:
> > Fix shift-out-of-bounds in ___bpf_prog_run().
>
> How is this "fixed"?
>
Fix shift-out-of-bounds in ___bpf_prog_run() by adding extra boundary
check in check_alu_op() in verifier.c.
> >
> > UBSAN: shift-out-of-bounds in kernel/bpf/core.c:1414:2
> > shift exponent 248 is too large for 32-bit type 'unsigned int'
>
> What is this from?
https://syzkaller.appspot.com/bug?id=edb51be4c9a320186328893287bb30d5eed09231
>
> Any reason you didn't cc: the bpf maintainers and developers?
>
Yes. I send them to you, the mentees mailing list and Shuah, first, for
review, comment and help. Is this not okay?
>
> > Reported-by: syzbot+bed360704c521841c85d@syzkaller.appspotmail.com
>
> Does this pass the syzbot testing?
Yes, it says 'OK' in the 'Result' column at:
https://syzkaller.appspot.com/bug?id=edb51be4c9a320186328893287bb30d5eed09231
It's the latest from fuzzybritches0@gmail.com.
But at this point I cannot say if this is right. Should I send the next
version to everyone?
thanks and kind regards,
Kurt Manucredo
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next prev parent reply other threads:[~2021-06-01 21:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-26 21:40 [PATCH] bpf: core: fix shift-out-of-bounds in ___bpf_prog_run Kurt Manucredo
2021-05-27 4:29 ` Greg KH
2021-06-01 14:33 ` [PATCH v2] " Kurt Manucredo
2021-06-01 15:43 ` Greg KH
2021-06-01 21:28 ` Kurt Manucredo [this message]
2021-06-02 6:09 ` Greg KH
2021-06-02 6:36 ` Pavel Skripkin
2021-06-04 21:15 ` Kurt Manucredo
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