linux-kernel - Re: [PATCH RFC] random: fix syzkaller fuzzer test int overflow

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Message-ID: <20171026150445.s3rxcy4btlisdu5q@thunk.org>
Date:   Thu, 26 Oct 2017 11:04:45 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Chen Feng <puck.chen@...ilicon.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, zhaoyukun@...wei.com,
        arnd@...db.de, linux-kernel@...r.kernel.org,
        suzhuangluan@...ilicon.com, dan.zhao@...ilicon.com
Subject: Re: [PATCH RFC] random: fix syzkaller fuzzer test int overflow

On Thu, Oct 26, 2017 at 04:25:15PM +0800, Chen Feng wrote:
> 
> 
> On 2017/10/25 16:49, Theodore Ts'o wrote:
> > Other people who have sent me fuzzer test reproducers are able to
> > reproduce syzkaller logs into a simple C program.  Can you explain to
> > me what the heck:
> > 
> >> r3 = syz_open_dev$urandom(&(0x7f000000a000)="2f6465762f7572616e646f6d00", 0x0, 0x0)
> > 
> > means?
> 
> Take a look at this:
> 
> https://github.com/google/syzkaller/blob/master/sys/linux/random.txt

Sorry, this *still* looks like gobbledygook.

What ioctls are you executing, and with what arguments?

*Please*, give me a C program I can compile.

					 -Ted