linux-kernel - Re: [kvm-unit-tests patch v6 07/18] x86: pmu: Fix potential out of bound access for fixed events

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Message-ID: <28dcae5c-4fb7-46a8-9f37-a4f9f59b45a2@linux.intel.com>
Date: Tue, 18 Feb 2025 17:34:09 +0800
From: "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
 linux-kernel@...r.kernel.org, Jim Mattson <jmattson@...gle.com>,
 Mingwei Zhang <mizhang@...gle.com>, Xiong Zhang <xiong.y.zhang@...el.com>,
 Zhenyu Wang <zhenyuw@...ux.intel.com>, Like Xu <like.xu.linux@...il.com>,
 Jinrong Liang <cloudliang@...cent.com>, Yongwei Ma <yongwei.ma@...el.com>,
 Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [kvm-unit-tests patch v6 07/18] x86: pmu: Fix potential out of
 bound access for fixed events


On 2/15/2025 5:07 AM, Sean Christopherson wrote:
> On Sat, Sep 14, 2024, Dapeng Mi wrote:
>> @@ -744,6 +753,12 @@ int main(int ac, char **av)
>>  	printf("Fixed counters:      %d\n", pmu.nr_fixed_counters);
>>  	printf("Fixed counter width: %d\n", pmu.fixed_counter_width);
>>  
>> +	fixed_counters_num = MIN(pmu.nr_fixed_counters, ARRAY_SIZE(fixed_events));
>> +	if (pmu.nr_fixed_counters > ARRAY_SIZE(fixed_events))
>> +		report_info("Fixed counters number %d > defined fixed events %ld. "
> Doesn't compile on 32-bit builds.  Easiest thing is to cast ARRAY_SIZE, because
> size_t is different between 32-bit and 64-bit.

But ARRAY_SIZE() should return same value regardless of 32-bit or 64-bit,
right?


>
>> +			    "Please update test case.", pmu.nr_fixed_counters,
>> +			    ARRAY_SIZE(fixed_events));
>> +
>>  	apic_write(APIC_LVTPC, PMI_VECTOR);
>>  
>>  	check_counters();
>> -- 
>> 2.40.1
>>