linux-kernel - Re: [for-next][PATCH 14/14] tracing: Get trace_array ref counts when accessing trace files

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Message-ID: <20140408133231.3b62f3da@gandalf.local.home>
Date:	Tue, 8 Apr 2014 13:32:31 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [for-next][PATCH 14/14] tracing: Get trace_array ref counts
 when accessing trace files

On Tue, 08 Apr 2014 13:11:32 -0400
Sasha Levin <sasha.levin@...cle.com> wrote:

> >>
> >> Although when I mount everything for the fuzzer I do it with '-onoexec,nosuid'
> >> and the fuzzer is banned from testing mount(), so I'm not sure how it would
> >> do that thing on it's own.
> > 
> > What does the -onoexec do? Not change the exec flag of files?
> 
> It lets you set it as executable, but it won't let you actually exec it.
> 
> > Also, I wonder if this has something to do with the syscall being a
> > compat sys_exec and not a native one. Is userspace on your vm 32bit? Or
> > does the fuzzer just try the different compat calls?
> 
> Right, everything is 64bit but the fuzzer tries 32bit calls as well.

When this bug is triggered, is there a way to let the fuzzer tell us
what exactly the last syscall it sent was? That is, the syscall number
plus all its arguments?

-- Steve
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