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Message-ID: <20240426164021.00006f4c@Huawei.com>
Date: Fri, 26 Apr 2024 16:40:21 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Junhao He <hejunhao3@...wei.com>
CC: <will@...nel.org>, <yangyicong@...wei.com>, <shaojijie@...wei.com>,
<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<linuxarm@...wei.com>, <prime.zeng@...ilicon.com>, <chenhao418@...wei.com>
Subject: Re: [PATCH 1/3] drivers/perf: hisi_pcie: Fix out-of-bound access
when valid event group
On Thu, 25 Apr 2024 20:46:25 +0800
Junhao He <hejunhao3@...wei.com> wrote:
> The perf tool allows users to create event groups through following
> cmd [1], but the driver does not check whether the array index is out of
> bounds when writing data to the event_group array. If the number of events
> in an event_group is greater than HISI_PCIE_MAX_COUNTERS, the memory write
> overflow of event_group array occurs.
>
> Add array index check to fix the possible array out of bounds violation,
> and return directly when write new events are written to array bounds.
>
> There are 9 different events in an event_group.
> [1] perf stat -e '{pmu/event1/, ... ,pmu/event9/}'
>
> Fixes: 8404b0fbc7fb ("drivers/perf: hisi: Add driver for HiSilicon PCIe PMU")
> Signed-off-by: Junhao He <hejunhao3@...wei.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Thanks,
> ---
> drivers/perf/hisilicon/hisi_pcie_pmu.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/perf/hisilicon/hisi_pcie_pmu.c b/drivers/perf/hisilicon/hisi_pcie_pmu.c
> index 5d1f0e9fdb08..dba399125658 100644
> --- a/drivers/perf/hisilicon/hisi_pcie_pmu.c
> +++ b/drivers/perf/hisilicon/hisi_pcie_pmu.c
> @@ -350,15 +350,27 @@ static bool hisi_pcie_pmu_validate_event_group(struct perf_event *event)
> return false;
>
> for (num = 0; num < counters; num++) {
> + /*
> + * If we find a related event, then it's a valid group
> + * since we don't need to allocate a new counter for it.
> + */
> if (hisi_pcie_pmu_cmp_event(event_group[num], sibling))
> break;
> }
>
> + /*
> + * Otherwise it's a new event but if there's no available counter,
> + * fail the check since we cannot schedule all the events in
> + * the group simultaneously.
> + */
> + if (num == HISI_PCIE_MAX_COUNTERS)
> + return false;
> +
> if (num == counters)
> event_group[counters++] = sibling;
> }
>
> - return counters <= HISI_PCIE_MAX_COUNTERS;
> + return true;
> }
>
> static int hisi_pcie_pmu_event_init(struct perf_event *event)
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