From: Lee Jones <lee.jones@linaro.org>
To: syzbot <syzbot+9671693590ef5aad8953@syzkaller.appspotmail.com>
Cc: asml.silence@gmail.com, axboe@kernel.dk,
io-uring@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] KASAN: stack-out-of-bounds Read in iov_iter_revert
Date: Wed, 3 Nov 2021 17:01:22 +0000 [thread overview]
Message-ID: <YYLAYvFU+9cnu+4H@google.com> (raw)
In-Reply-To: <00000000000047f3b805c962affb@google.com>
Good afternoon Pavel,
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
>
> Reported-and-tested-by: syzbot+9671693590ef5aad8953@syzkaller.appspotmail.com
>
> Tested on:
>
> commit: bff2c168 io_uring: don't retry with truncated iter
> git tree: https://github.com/isilence/linux.git truncate
> kernel config: https://syzkaller.appspot.com/x/.config?x=730106bfb5bf8ace
> dashboard link: https://syzkaller.appspot.com/bug?extid=9671693590ef5aad8953
> compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
>
> Note: testing is done by a robot and is best-effort only.
As you can see in the 'dashboard link' above this bug also affects
android-5-10 which is currently based on v5.10.75.
I see that the back-port of this patch failed in v5.10.y:
https://lore.kernel.org/stable/163152589512611@kroah.com/
And after solving the build-error by back-porting both:
2112ff5ce0c11 iov_iter: track truncated size
89c2b3b749182 io_uring: reexpand under-reexpanded iters
I now see execution tripping the WARN() in iov_iter_revert():
if (WARN_ON(unroll > MAX_RW_COUNT))
return
Am I missing any additional patches required to fix stable/v5.10.y?
Any help would be gratefully received.
Kind regards,
Lee
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2021-11-03 17:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 13:43 [syzbot] KASAN: stack-out-of-bounds Read in iov_iter_revert syzbot
2021-08-12 14:30 ` Pavel Begunkov
2021-08-12 20:36 ` syzbot
2021-11-03 17:01 ` Lee Jones [this message]
2021-11-08 15:29 ` Pavel Begunkov
2021-11-08 15:41 ` Jens Axboe
2021-11-09 13:33 ` Lee Jones
2021-12-15 8:06 ` Lee Jones
2021-12-15 11:16 ` Pavel Begunkov
2021-12-16 17:02 ` Lee Jones
2022-02-22 16:48 ` Lee Jones
2022-03-21 10:52 ` Lee Jones
2022-05-05 14:11 ` linux-stable-5.10-y CVE-2022-1508 of io_uring module Guo Xuenan
2022-05-06 2:16 ` Jens Axboe
2022-05-06 15:57 ` Pavel Begunkov
2022-05-06 16:15 ` Jens Axboe
2022-05-06 18:22 ` Jens Axboe
2022-05-07 9:16 ` Pavel Begunkov
2022-05-07 14:18 ` Jens Axboe
2022-05-08 11:43 ` Pavel Begunkov
2021-08-23 0:24 ` [syzbot] KASAN: stack-out-of-bounds Read in iov_iter_revert Pavel Begunkov
2021-08-23 0:44 ` syzbot
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