* Re: KASAN: use-after-free Read in skb_release_data (2)
[not found] <000000000000da6059059fcfdcf9@google.com>
@ 2020-03-31 17:36 ` syzbot
2020-03-31 17:41 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2020-03-31 17:36 UTC (permalink / raw)
To: davem, festevam, gregkh, grundler, hayeswang, johan.hedberg,
kernel, linux-arm-kernel, linux-bluetooth, linux-imx,
linux-kernel, linux-usb, marcel, nishadkamdar, peter.chen,
pmalani, s.hauer, shawnguo, syzkaller-bugs
syzbot suspects this bug was fixed by commit:
commit d9958306d4be14f4c7466242b38ed3893a7b1386
Author: Nishad Kamdar <nishadkamdar@gmail.com>
Date: Sun Mar 15 10:55:07 2020 +0000
USB: chipidea: Use the correct style for SPDX License Identifier
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16d4940be00000
start commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
dashboard link: https://syzkaller.appspot.com/bug?extid=a66a7c2e996797bb4acb
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c25a81e00000
If the result looks correct, please mark the bug fixed by replying with:
#syz fix: USB: chipidea: Use the correct style for SPDX License Identifier
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KASAN: use-after-free Read in skb_release_data (2)
2020-03-31 17:36 ` KASAN: use-after-free Read in skb_release_data (2) syzbot
@ 2020-03-31 17:41 ` Greg KH
2020-03-31 17:44 ` Grant Grundler
0 siblings, 1 reply; 4+ messages in thread
From: Greg KH @ 2020-03-31 17:41 UTC (permalink / raw)
To: syzbot
Cc: davem, festevam, grundler, hayeswang, johan.hedberg, kernel,
linux-arm-kernel, linux-bluetooth, linux-imx, linux-kernel,
linux-usb, marcel, nishadkamdar, peter.chen, pmalani, s.hauer,
shawnguo, syzkaller-bugs
On Tue, Mar 31, 2020 at 10:36:01AM -0700, syzbot wrote:
> syzbot suspects this bug was fixed by commit:
>
> commit d9958306d4be14f4c7466242b38ed3893a7b1386
> Author: Nishad Kamdar <nishadkamdar@gmail.com>
> Date: Sun Mar 15 10:55:07 2020 +0000
>
> USB: chipidea: Use the correct style for SPDX License Identifier
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16d4940be00000
> start commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
> git tree: upstream
> kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
> dashboard link: https://syzkaller.appspot.com/bug?extid=a66a7c2e996797bb4acb
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c25a81e00000
>
> If the result looks correct, please mark the bug fixed by replying with:
>
> #syz fix: USB: chipidea: Use the correct style for SPDX License Identifier
I really doubt a comment change fixed a syzbot bug :)
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KASAN: use-after-free Read in skb_release_data (2)
2020-03-31 17:41 ` Greg KH
@ 2020-03-31 17:44 ` Grant Grundler
2020-04-01 9:12 ` Dmitry Vyukov
0 siblings, 1 reply; 4+ messages in thread
From: Grant Grundler @ 2020-03-31 17:44 UTC (permalink / raw)
To: Greg KH
Cc: syzbot, David Miller, festevam, Grant Grundler, Hayes Wang,
johan.hedberg, kernel, linux-arm-kernel, linux-bluetooth,
linux-imx, LKML, linux-usb, marcel, nishadkamdar, peter.chen,
Prashant Malani, Sascha Hauer, shawnguo, syzkaller-bugs
On Tue, Mar 31, 2020 at 10:41 AM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Tue, Mar 31, 2020 at 10:36:01AM -0700, syzbot wrote:
> > syzbot suspects this bug was fixed by commit:
> >
> > commit d9958306d4be14f4c7466242b38ed3893a7b1386
> > Author: Nishad Kamdar <nishadkamdar@gmail.com>
> > Date: Sun Mar 15 10:55:07 2020 +0000
> >
> > USB: chipidea: Use the correct style for SPDX License Identifier
> >
> > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16d4940be00000
> > start commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
> > git tree: upstream
> > kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
> > dashboard link: https://syzkaller.appspot.com/bug?extid=a66a7c2e996797bb4acb
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c25a81e00000
> >
> > If the result looks correct, please mark the bug fixed by replying with:
> >
> > #syz fix: USB: chipidea: Use the correct style for SPDX License Identifier
>
> I really doubt a comment change fixed a syzbot bug :)
Just as I don't believe the bug was caused by pmalani's patch to r8152.
syzbot is just having trouble automatically bisecting/tracking this
bug since it appears only intermittently.
cheers,
grant
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KASAN: use-after-free Read in skb_release_data (2)
2020-03-31 17:44 ` Grant Grundler
@ 2020-04-01 9:12 ` Dmitry Vyukov
0 siblings, 0 replies; 4+ messages in thread
From: Dmitry Vyukov @ 2020-04-01 9:12 UTC (permalink / raw)
To: Grant Grundler, syzkaller
Cc: Greg KH, syzbot, David Miller, festevam, Hayes Wang,
Johan Hedberg, kernel, Linux ARM, linux-bluetooth, dl-linux-imx,
LKML, USB list, Marcel Holtmann, nishadkamdar, peter.chen,
Prashant Malani, Sascha Hauer, Shawn Guo, syzkaller-bugs
On Tue, Mar 31, 2020 at 7:44 PM Grant Grundler <grundler@chromium.org> wrote:
>
> On Tue, Mar 31, 2020 at 10:41 AM Greg KH <gregkh@linuxfoundation.org> wrote:
> >
> > On Tue, Mar 31, 2020 at 10:36:01AM -0700, syzbot wrote:
> > > syzbot suspects this bug was fixed by commit:
> > >
> > > commit d9958306d4be14f4c7466242b38ed3893a7b1386
> > > Author: Nishad Kamdar <nishadkamdar@gmail.com>
> > > Date: Sun Mar 15 10:55:07 2020 +0000
> > >
> > > USB: chipidea: Use the correct style for SPDX License Identifier
> > >
> > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16d4940be00000
> > > start commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
> > > git tree: upstream
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=a66a7c2e996797bb4acb
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c25a81e00000
> > >
> > > If the result looks correct, please mark the bug fixed by replying with:
> > >
> > > #syz fix: USB: chipidea: Use the correct style for SPDX License Identifier
> >
> > I really doubt a comment change fixed a syzbot bug :)
>
> Just as I don't believe the bug was caused by pmalani's patch to r8152.
>
> syzbot is just having trouble automatically bisecting/tracking this
> bug since it appears only intermittently.
Checking if vmlinux changes after applying the patch looked like a
smart and simple way to detect all of:
- Comment-only change
- Documentation-only change
- Change to a non-current arch
- Changed to non-enabled configs
- Changes to tests only
But it's not working in reality, there is some bug in kernel or compiler:
https://github.com/google/syzkaller/issues/1271#issuecomment-559093018
You may see in this bisection log as well:
culprit signature:
85ed07d5a8769c26fa0d170475624841e367ea0d08ea79f55ca450a9e97429a0
parent signature:
2244116b3fcae3bb24003990bcd2b06a03861effee2d94675e527446c3da078f
So this commit somehow does very realistically affect the kernel
binary. So far nobody figured out why...
Before you ask, syzkaller filters out debug info, etc:
https://github.com/google/syzkaller/blob/master/pkg/build/linux.go#L168-L178
^ permalink raw reply [flat|nested] 4+ messages in thread
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[not found] <000000000000da6059059fcfdcf9@google.com>
2020-03-31 17:36 ` KASAN: use-after-free Read in skb_release_data (2) syzbot
2020-03-31 17:41 ` Greg KH
2020-03-31 17:44 ` Grant Grundler
2020-04-01 9:12 ` Dmitry Vyukov
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