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SubjectRe: [syzbot] KASAN: slab-out-of-bounds Read in copy_data
On Wed, Oct 27, 2021 at 09:08:04AM +0200, Laurent Vivier wrote:
> On 27/10/2021 00:34, Eric Dumazet wrote:
> >
> >
> > On 10/26/21 9:39 AM, syzbot wrote:
> > > Hello,
> > >
> > > syzbot found the following issue on:
> > >
> > > HEAD commit: 9ae1fbdeabd3 Add linux-next specific files for 20211025
> > > git tree: linux-next
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=1331363cb00000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=aeb17e42bc109064
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=b86736b5935e0d25b446
> > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116ce954b00000
> > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132fcf62b00000
> > >
> > > The issue was bisected to:
> > >
> > > commit 22849b5ea5952d853547cc5e0651f34a246b2a4f
> > > Author: Leon Romanovsky <leonro@nvidia.com>
> > > Date: Thu Oct 21 14:16:14 2021 +0000
> > >
> > > devlink: Remove not-executed trap policer notifications
> >
> > More likely this came with
> >
> > caaf2874ba27b92bca6f0298bf88bad94067ec37 hwrng: virtio - don't waste entropy
> >
>
> I'm going to have a look.
>
> Thanks,
> Laurent

How bad is it if we just drop this and waste some bytes of entropy?

--
MST

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