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Date: Thu, 23 May 2019 00:50:06 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: "Liang, Kan" <kan.liang@...ux.intel.com>
Cc: Vince Weaver <vincent.weaver@...ne.edu>,
Andi Kleen <ak@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Stephane Eranian <eranian@...gle.com>,
Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: perf: fuzzer causes crash in new XMM code
On Wed, May 22, 2019 at 05:54:58PM -0400, Liang, Kan wrote:
SNIP
> > [ 9680.197779] RSP: 002b:00007fff595603a8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
> > [ 9680.205489] RAX: 0000000000004985 RBX: 000000000000000c RCX: 00000000000365ca
> > [ 9680.212748] RDX: 00001e15d36cec84 RSI: 0000000000000000 RDI: 0000000000000001
> > [ 9680.220059] RBP: 00007fff595603c0 R08: 0000000000000000 R09: 00007fccbb62e540
> > [ 9680.227362] R10: fffffffffffffd4e R11: 0000000000000246 R12: 000055dad779a4c0
> > [ 9680.234630] R13: 00007fff595627b0 R14: 0000000000000000 R15: 0000000000000000
> > [ 9680.310017] ---[ end trace 511b9368cf14c65a ]---
> >
>
> Hi Vince,
>
> Thanks for the test.
>
> XMM registers can only collected by hardware PEBS events. We should disable
> it for all software/probe events.
I think you should also include HW non-PEBS events
in those checks below
jirka
>
> Could you please try the patch as below?
>
> Thanks,
> Kan
>
> From 0136d8374c2db65b125c8d92b661c96e8d21adb0 Mon Sep 17 00:00:00 2001
> From: Kan Liang <kan.liang@...ux.intel.com>
> Date: Wed, 22 May 2019 12:14:16 -0700
> Subject: [PATCH] perf/x86: Disable non generic regs for software/probe
> events
>
> The perf fuzzer caused skylake machine to crash.
>
> [ 9680.085831] Call Trace:
> [ 9680.088301] <IRQ>
> [ 9680.090363] perf_output_sample_regs+0x43/0xa0
> [ 9680.094928] perf_output_sample+0x3aa/0x7a0
> [ 9680.099181] perf_event_output_forward+0x53/0x80
> [ 9680.103917] __perf_event_overflow+0x52/0xf0
> [ 9680.108266] ? perf_trace_run_bpf_submit+0xc0/0xc0
> [ 9680.113108] perf_swevent_hrtimer+0xe2/0x150
> [ 9680.117475] ? check_preempt_wakeup+0x181/0x230
> [ 9680.122091] ? check_preempt_curr+0x62/0x90
> [ 9680.126361] ? ttwu_do_wakeup+0x19/0x140
> [ 9680.130355] ? try_to_wake_up+0x54/0x460
> [ 9680.134366] ? reweight_entity+0x15b/0x1a0
> [ 9680.138559] ? __queue_work+0x103/0x3f0
> [ 9680.142472] ? update_dl_rq_load_avg+0x1cd/0x270
> [ 9680.147194] ? timerqueue_del+0x1e/0x40
> [ 9680.151092] ? __remove_hrtimer+0x35/0x70
> [ 9680.155191] __hrtimer_run_queues+0x100/0x280
> [ 9680.159658] hrtimer_interrupt+0x100/0x220
> [ 9680.163835] smp_apic_timer_interrupt+0x6a/0x140
> [ 9680.168555] apic_timer_interrupt+0xf/0x20
> [ 9680.172756] </IRQ>
>
> The XMM registers can only be collected by hardware PEBS events, not
> software/probe events.
>
> Add has_non_generic_regs() to check if non-generic regs, e.g. XMM on
> X86, are applied for software/probe events. If yes, return -EOPNOTSUPP.
>
> Add __weak function non_generic_regs_mask() to return the mask of
> non-generic regs. For X86, the mask of non-generic regs equals to the
> mask of XMM registers.
>
> Fixes: 878068ea270e ("perf/x86: Support outputting XMM registers")
> Reported-by: Vince Weaver <vincent.weaver@...ne.edu>
> Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> ---
> arch/x86/kernel/perf_regs.c | 5 +++++
> include/linux/perf_regs.h | 2 ++
> kernel/events/core.c | 37 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 44 insertions(+)
>
> diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
> index 07c30ee..86ffe5a 100644
> --- a/arch/x86/kernel/perf_regs.c
> +++ b/arch/x86/kernel/perf_regs.c
> @@ -57,6 +57,11 @@ static unsigned int pt_regs_offset[PERF_REG_X86_MAX] = {
> #endif
> };
>
> +u64 non_generic_regs_mask(void)
> +{
> + return (~((1ULL << PERF_REG_X86_XMM0) - 1));
> +}
> +
> u64 perf_reg_value(struct pt_regs *regs, int idx)
> {
> struct x86_perf_regs *perf_regs;
> diff --git a/include/linux/perf_regs.h b/include/linux/perf_regs.h
> index 4767474..c1c3454 100644
> --- a/include/linux/perf_regs.h
> +++ b/include/linux/perf_regs.h
> @@ -9,6 +9,8 @@ struct perf_regs {
> struct pt_regs *regs;
> };
>
> +u64 non_generic_regs_mask(void);
> +
> #ifdef CONFIG_HAVE_PERF_REGS
> #include <asm/perf_regs.h>
> u64 perf_reg_value(struct pt_regs *regs, int idx);
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index abbd4b3..14da1d9 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -8457,6 +8457,19 @@ static void sw_perf_event_destroy(struct perf_event
> *event)
> swevent_hlist_put();
> }
>
> +u64 __weak non_generic_regs_mask(void)
> +{
> + return 0;
> +}
> +
> +static inline bool has_non_generic_regs(struct perf_event *event)
> +{
> + u64 mask = non_generic_regs_mask();
> +
> + return ((event->attr.sample_regs_user & mask) ||
> + (event->attr.sample_regs_intr & mask));
> +}
> +
> static int perf_swevent_init(struct perf_event *event)
> {
> u64 event_id = event->attr.config;
> @@ -8470,6 +8483,10 @@ static int perf_swevent_init(struct perf_event
> *event)
> if (has_branch_stack(event))
> return -EOPNOTSUPP;
>
> + /* only support generic regs */
> + if (has_non_generic_regs(event))
> + return -EOPNOTSUPP;
> +
> switch (event_id) {
> case PERF_COUNT_SW_CPU_CLOCK:
> case PERF_COUNT_SW_TASK_CLOCK:
> @@ -8633,6 +8650,10 @@ static int perf_tp_event_init(struct perf_event
> *event)
> if (has_branch_stack(event))
> return -EOPNOTSUPP;
>
> + /* only support generic regs */
> + if (has_non_generic_regs(event))
> + return -EOPNOTSUPP;
> +
> err = perf_trace_init(event);
> if (err)
> return err;
> @@ -8722,6 +8743,10 @@ static int perf_kprobe_event_init(struct perf_event
> *event)
> if (has_branch_stack(event))
> return -EOPNOTSUPP;
>
> + /* only support generic regs */
> + if (has_non_generic_regs(event))
> + return -EOPNOTSUPP;
> +
> is_retprobe = event->attr.config & PERF_PROBE_CONFIG_IS_RETPROBE;
> err = perf_kprobe_init(event, is_retprobe);
> if (err)
> @@ -8782,6 +8807,10 @@ static int perf_uprobe_event_init(struct perf_event
> *event)
> if (has_branch_stack(event))
> return -EOPNOTSUPP;
>
> + /* only support generic regs */
> + if (has_non_generic_regs(event))
> + return -EOPNOTSUPP;
> +
> is_retprobe = event->attr.config & PERF_PROBE_CONFIG_IS_RETPROBE;
> ref_ctr_offset = event->attr.config >> PERF_UPROBE_REF_CTR_OFFSET_SHIFT;
> err = perf_uprobe_init(event, ref_ctr_offset, is_retprobe);
> @@ -9562,6 +9591,10 @@ static int cpu_clock_event_init(struct perf_event
> *event)
> if (has_branch_stack(event))
> return -EOPNOTSUPP;
>
> + /* only support generic regs */
> + if (has_non_generic_regs(event))
> + return -EOPNOTSUPP;
> +
> perf_swevent_init_hrtimer(event);
>
> return 0;
> @@ -9643,6 +9676,10 @@ static int task_clock_event_init(struct perf_event
> *event)
> if (has_branch_stack(event))
> return -EOPNOTSUPP;
>
> + /* only support generic regs */
> + if (has_non_generic_regs(event))
> + return -EOPNOTSUPP;
> +
> perf_swevent_init_hrtimer(event);
>
> return 0;
> --
> 2.7.4
>
>
>
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