linux-ext4 - Re: [io_uring] KASAN: use-after-free Read in signalfd

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Date:   Thu, 12 Jan 2023 18:26:04 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        syzbot <syzbot+8317cc9c082c19d576a0@...kaller.appspotmail.com>,
        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, nathan@...nel.org, ndesaulniers@...gle.com,
        syzkaller-bugs@...glegroups.com, trix@...hat.com, tytso@....edu,
        viro@...iv.linux.org.uk
Subject: Re: [io_uring] KASAN: use-after-free Read in signalfd_cleanup

On Thu, Jan 12, 2023 at 07:17:25PM -0700, Jens Axboe wrote:
> On 1/12/23 7:12 PM, Eric Biggers wrote:
> > Over to the io_uring maintainers and list, based on the reproducer...:
> > 
> >     r0 = signalfd4(0xffffffffffffffff, &(0x7f00000000c0), 0x8, 0x0)
> >     r1 = syz_io_uring_setup(0x87, &(0x7f0000000180), &(0x7f0000ffc000/0x3000)=nil, &(0x7f00006d4000/0x1000)=nil, &(0x7f0000000000)=<r2=>0x0, &(0x7f0000000040)=<r3=>0x0)
> >     pipe(&(0x7f0000000080)={0xffffffffffffffff, <r4=>0xffffffffffffffff})
> >     write$binfmt_misc(r4, &(0x7f0000000000)=ANY=[], 0xfffffecc)
> >     syz_io_uring_submit(r2, r3, &(0x7f0000002240)=@...ING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0}, 0x0)
> >     io_uring_enter(r1, 0x450c, 0x0, 0x0, 0x0, 0x0)
> 
> This was a buggy patch in a branch, already updated and can be discarded.
> 

Then let's do:

#syz invalid