Messages in this thread | | | From | Vince Weaver <> | Date | Fri, 19 Jun 2015 14:55:51 -0400 (EDT) | Subject | Re: perf/ftrace: fuzzer triggers another warning with PERF_EVENT_IOC_SET_FILTER |
| |
On Thu, 18 Jun 2015, Steven Rostedt wrote:
> On Wed, 17 Jun 2015 19:32:26 -0400 (EDT) > Vince Weaver <vincent.weaver@maine.edu> wrote: > > > > > The fuzzer triggered another warning in the PERF_EVENT_IOC_SET_FILTER > > code. This is with the previous filter patch applied. > > > > >From what I can tell the filter was: > > nfs4:nfs4_fsinfo > > (((fhandle~601)&&valid&809)&&common_type>=860) > > Hmm, I can't trigger this with the filter file, can you? > > echo '(((fhandle~601)&&valid&809)&&common_type>=860)' > \ > /sys/kernel/debug/tracing/events/nfs4/nfs4_fsinfo/filter > > I'll write a user app to use the perf syscall and see if that is > different, but in the mean time, can you try the above.
OK, fuzzing found another test case, this one I can reproduce using perf:
power:cpu_frequency filter is (without the quotes) " ( ( == ) ) "
yes I know that filter is a bit rediculous. Some of those spaces might be tabs. Anyway it leads to:
[13626.276459] WARNING: CPU: 3 PID: 17880 at kernel/trace/trace_events_filter.c:1388 replace_preds+0x2e4/0xa50() [13626.360782] CPU: 3 PID: 17880 Comm: perf_fuzzer Not tainted 4.1.0-rc8+ #158 [13626.368264] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 [13626.376238] ffffffff81a1ac10 ffff8800bf30fcb8 ffffffff816d7439 0000000000000000 [13626.384294] 0000000000000000 ffff8800bf30fcf8 ffffffff81072eba ffff8800c56c0200 [13626.392329] 0000000000000001 ffff880036e4e418 ffff880036e4e400 ffff8800c56c01a0 [13626.400377] Call Trace: [13626.403023] [<ffffffff816d7439>] dump_stack+0x45/0x57 [13626.408539] [<ffffffff81072eba>] warn_slowpath_common+0x8a/0xc0 [13626.415002] [<ffffffff81072faa>] warn_slowpath_null+0x1a/0x20 [13626.421289] [<ffffffff8114b1c4>] replace_preds+0x2e4/0xa50 [13626.427262] [<ffffffff8114c2c3>] ? ftrace_profile_set_filter+0x23/0x100 [13626.434456] [<ffffffff8114b9b2>] create_filter+0x82/0xb0 [13626.440680] [<ffffffff8114c2f4>] ftrace_profile_set_filter+0x54/0x100 [13626.448135] [<ffffffff81190a0b>] ? strndup_user+0x4b/0xc0 [13626.454464] [<ffffffff81166260>] perf_ioctl+0x170/0x4d0 [13626.460638] [<ffffffff810bb653>] ? up_write+0x23/0x50 [13626.466579] [<ffffffff812023f0>] do_vfs_ioctl+0x2e0/0x4e0 [13626.472920] [<ffffffff8120d0a5>] ? __fget+0x5/0xe0 [13626.478581] [<ffffffff811a8f68>] ? SyS_mmap_pgoff+0xe8/0x290 [13626.485140] [<ffffffff81202671>] SyS_ioctl+0x81/0xa0 [13626.490963] [<ffffffff816df372>] system_call_fastpath+0x16/0x7a [13626.497824] ---[ end trace 1beaa0aa99bf553f ]---
-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
| |