From: Vince Weaver <vincent.weaver@maine.edu>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
"dvyukov@google.com" <dvyukov@google.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: Re: perf: fuzzer KASAN: global-out-of-bounds in match_token
Date: Thu, 17 Nov 2016 21:51:24 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.20.1611172149260.14035@macbook-air> (raw)
In-Reply-To: <alpine.DEB.2.20.1611171706470.12680@macbook-air>
On Thu, 17 Nov 2016, Vince Weaver wrote:
> 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
I managed to create a short reproducer that reliably causes the issue on
my skylake test machine.
/* simplified perf_fuzzer test case */
/* that triggers BUG: KASAN: global-out-of-bounds in match_token+0x288 */
/* on a skylake machine running Linux 4.9-rc5 */
/* by Vince Weaver <vincent.weaver _at_ maine.edu> */
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <linux/perf_event.h>
int perf_event_open(struct perf_event_attr *hw_event_uptr,
pid_t pid, int cpu, int group_fd, unsigned long flags) {
return syscall(__NR_perf_event_open,hw_event_uptr, pid, cpu,
group_fd, flags);
}
int main(int argc, char **argv) {
int fd7;
struct perf_event_attr pe7;
char filter[]="(((to&733)&&common_type&605)||common_flags<386922879890793102)";
memset(&pe7,0,sizeof(struct perf_event_attr));
pe7.type=7; /* intel_pt */
pe7.size=72;
pe7.config=0x200ULL; /* bit 10 = tsc */
pe7.read_format=PERF_FORMAT_TOTAL_TIME_ENABLED; /* 1 */
pe7.disabled=1;
pe7.pinned=1;
pe7.comm_exec=1;
fd7=perf_event_open(&pe7,
0, /* current thread */
0, /* Only cpu 0 */
-1, /* group leader */
PERF_FLAG_FD_NO_GROUP /*1*/ );
ioctl(fd7, PERF_EVENT_IOC_SET_FILTER , &filter);
return 0;
}
next prev parent reply other threads:[~2016-11-18 2:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-17 20:24 perf: fuzzer KASAN: global-out-of-bounds in match_token Vince Weaver
2016-11-17 20:37 ` Vince Weaver
2016-11-17 22:11 ` Vince Weaver
2016-11-18 2:51 ` Vince Weaver [this message]
2016-11-18 8:24 ` Ingo Molnar
2016-11-18 11:38 ` Alexander Shishkin
2016-11-18 18:02 ` Vince Weaver
2016-11-21 10:38 ` [tip:perf/urgent] perf/core: Fix address filter parser tip-bot for Alexander Shishkin
2016-11-17 23:11 ` perf: fuzzer KASAN: global-out-of-bounds in match_token Andi Kleen
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