Re: [PATCH v3 0/5] aio: fix use-after-free and missing wakeups

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 1/5/22 7:26 AM, Eric Biggers wrote:
> On Thu, Dec 09, 2021 at 02:46:45PM -0700, Jens Axboe wrote:
>> On 12/9/21 11:00 AM, Linus Torvalds wrote:
>>> On Wed, Dec 8, 2021 at 5:06 PM Eric Biggers <ebiggers@xxxxxxxxxx> wrote:
>>>>
>>>> Careful review is appreciated; the aio poll code is very hard to work
>>>> with, and it doesn't appear to have many tests.  I've verified that it
>>>> passes the libaio test suite, which provides some coverage of poll.
>>>>
>>>> Note, it looks like io_uring has the same bugs as aio poll.  I haven't
>>>> tried to fix io_uring.
>>>
>>> I'm hoping Jens is looking at the io_ring case, but I'm also assuming
>>> that I'll just get a pull request for this at some point.
>>
>> Yes, when I saw this original posting I did discuss it with Pavel as
>> well, and we agree that the same issue exists there. Which isn't too
>> surprising, as that's where the io_uring poll code from originally.
>>
> 
> Jens, any update on fixing the io_uring version of the bug?  Note,
> syzbot has managed to use io_uring poll to hit the WARN_ON_ONCE() that
> I added in __wake_up_pollfree(), which proves that it is broken.

There are two parts to this, first part is queued up for 5.17 for a few
weeks. Work in progress...

-- 
Jens Axboe




[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [NTFS 3]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [NTFS 3]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux