From: Chen Feng <puck.chen@hisilicon.com>
To: "Theodore Ts'o" <tytso@mit.edu>,
Greg KH <gregkh@linuxfoundation.org>, <zhaoyukun@huawei.com>,
<arnd@arndb.de>, <linux-kernel@vger.kernel.org>,
<suzhuangluan@hisilicon.com>, <dan.zhao@hisilicon.com>
Subject: Re: [PATCH RFC] random: fix syzkaller fuzzer test int overflow
Date: Wed, 25 Oct 2017 14:30:56 +0800 [thread overview]
Message-ID: <59F02FA0.7090605@hisilicon.com> (raw)
In-Reply-To: <20171024102528.7oywdwjriesoh3mk@thunk.org>
Hi Ted,
On 2017/10/24 18:25, Theodore Ts'o wrote:
> On Tue, Oct 24, 2017 at 11:09:27AM +0200, Greg KH wrote:
>> On Tue, Oct 24, 2017 at 03:44:17PM +0800, Chen Feng wrote:
>>> [pid:11940,cpu6,syz-executor][flp_ioctl]cmd[0x1]
>>> Restart is not permit
>>> =================================================================
>>> UBSAN: Undefined behaviour in
>>> kernel/linux-4.4/drivers/char/random.c:676:19
>>> signed integer overflow:
>>> 2147483645 + 268435455 cannot be represented in type 'int'
>>> CPU: 4 PID: 11941 Comm: syz-executor Not tainted 4.4.76+ #2
>>
>> Does this also happen on 4.14-rc6?
>
> No. It was fixed in 4.8, by commit 86a574de4590: "random: strengthen
> input validation for RNDADDTOENTCNT".
I see my kernel has already merged this patch. So I don't think this patch
can resolve the issue above.
-feng
>
> - Ted
>
> .
>
next prev parent reply other threads:[~2017-10-25 6:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-24 7:44 Chen Feng
2017-10-24 9:09 ` Greg KH
2017-10-24 9:24 ` Chen Feng
2017-10-24 9:57 ` Greg KH
2017-10-24 10:25 ` Theodore Ts'o
2017-10-25 6:30 ` Chen Feng [this message]
2017-10-25 6:56 ` Greg KH
2017-10-25 7:08 ` Chen Feng
2017-10-25 8:49 ` Theodore Ts'o
2017-10-26 8:25 ` Chen Feng
2017-10-26 15:04 ` Theodore Ts'o
2017-10-28 3:22 ` Chen Feng
2017-10-29 18:25 ` Theodore Ts'o
2017-10-30 7:39 ` Greg KH
2017-10-30 9:11 ` Theodore Ts'o
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