linux-kernel - Re: [syzbot] [io-uring?] KASAN: null-ptr-deref Write in sys_io_uring

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Message-ID: <CAJ-ks9my1amcMNsc7nTE4opeOC=YA46=2_6M9X4T-a=mm7_Nkw@mail.gmail.com>
Date: Wed, 4 Dec 2024 13:55:15 -0500
From: Tamir Duberstein <tamird@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Jens Axboe <axboe@...nel.dk>, 
	syzbot <syzbot+092bbab7da235a02a03a@...kaller.appspotmail.com>, 
	asml.silence@...il.com, io-uring@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [syzbot] [io-uring?] KASAN: null-ptr-deref Write in sys_io_uring_register

On Wed, Dec 4, 2024 at 1:51 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Wed, Dec 04, 2024 at 01:39:37PM -0500, Tamir Duberstein wrote:
> > > I thought I did, but when I ran it again just now, this test did catch
> > > it. So there is coverage.
> >
> > Matthew, would you consider a patch that migrates the xarray tests to kunit?
>
> how would that help?  it's already a kernel module as well as being a
> userspace testsuite.  kunit just seemed to add useless boilerplate last
> tie i looked.

The primary benefit is integration with kunit.py that presents nicer
human-readable output compared to the existing machinery. It does add
some boilerplate (~120 loc out of ~2300).