From: David Laight
> Sent: 26 September 2020 12:16
> To: 'syzbot' <syzbot+51177e4144d764827...@syzkaller.appspotmail.com>;
> linux-fsde...@vger.kernel.org;
> linux-kernel@vger.kernel.org; syzkaller-b...@googlegroups.com;
> v...@zeniv.linux.org.uk
> Subject: RE: WARNING in __kernel_read (2)
>
> > From: syzbot <syzbot+51177e4144d764827...@syzkaller.appspotmail.com>
> > Sent: 26 September 2020 03:58
> > To: linux-fsde...@vger.kernel.org; linux-kernel@vger.kernel.org;
> > syzkaller-b...@googlegroups.com;
> > v...@zeniv.linux.org.uk
> > Subject: WARNING in __kernel_read (2)
>
> I suspect this is calling finit_module() on an fd
> that doesn't have read permissions.
Code inspection also seems to imply that the check means
the exec() also requires read permissions on the file.
This isn't traditionally true.
suid #! scripts are particularly odd without 'owner read'
(everyone except the owner can run them!).
David
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