linux-kernel - Re: perf: fuzzer KASAN: global-out-of-bounds in match

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Message-ID: <alpine.DEB.2.20.1611171706470.12680@macbook-air>
Date:   Thu, 17 Nov 2016 17:11:55 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: perf: fuzzer KASAN: global-out-of-bounds in match_token

On Thu, 17 Nov 2016, Vince Weaver wrote:
> > 
> > [  911.507365] ==================================================================
> > [  911.514824] BUG: KASAN: global-out-of-bounds in match_token+0x268/0x310 at addr ffffffffb14ad058
> > [  911.523912] Read of size 8 by task perf_fuzzer/20662
> > [  911.528945] Address belongs to variable if_tokens+0x78/0xa0
> > [  911.534619] CPU: 7 PID: 20662 Comm: perf_fuzzer Tainted: G             L  4.9.0-rc5+ #12
> > [  911.534620] Hardware name: LENOVO 10FY0017US/SKYBAY, BIOS FWKT53A   06/06/2016
> > [  911.534622]  ffff8801efd2f970 ffffffffb0f17c88 ffff8801efd2fa08 ffffffffb14ad058
> > [  911.534624]  ffff8801efd2f9f8 ffffffffb0d0a9f3 1ffff1003dfa5f38 ffff8801efd2fc38
> > [  911.534627]  ffff8801f12ca100 0000000000000297 ffff8801efd2fc38 ffff8801efd2fa38

OK, this one is easily reproducible and from what I can tell it is caused 
by calling

ioctl(PERF_EVENT_IOC_SET_FILTER)
where the filter trying to be set is
	(((to&733)&&common_type&605)||common_flags<386922879890793102)
the ioctl itself fails due to EINVAL

I'll see if I can come up with a working small test case.

Vince