From: Junhao He hejunhao3@huawei.com

stable inclusion from stable-v6.6.33 commit be1fa711e59c874d049f592aef1d4685bdd22bdf category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SDT CVE: CVE-2024-38568

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 81bdd60a3d1d3b05e6cc6674845afb1694dd3a0e ]

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 HNS3_PMU_MAX_HW_EVENTS, 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: 66637ab137b4 ("drivers/perf: hisi: add driver for HNS3 PMU") Signed-off-by: Junhao He hejunhao3@huawei.com Signed-off-by: Hao Chen chenhao418@huawei.com Acked-by: Jonathan Cameron Jonathan.Cameron@huawei.com Reviewed-by: Jijie Shao shaojijie@huawei.com Link: https://lore.kernel.org/r/20240425124627.13764-3-hejunhao3@huawei.com Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Kaixiong Yu yukaixiong@huawei.com --- drivers/perf/hisilicon/hns3_pmu.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/perf/hisilicon/hns3_pmu.c b/drivers/perf/hisilicon/hns3_pmu.c index 40edc4cfcc34..47c0de7671cc 100644 --- a/drivers/perf/hisilicon/hns3_pmu.c +++ b/drivers/perf/hisilicon/hns3_pmu.c @@ -1088,15 +1088,27 @@ static bool hns3_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 (hns3_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 == HNS3_PMU_MAX_HW_EVENTS) + return false; + if (num == counters) event_group[counters++] = sibling; }

- return counters <= HNS3_PMU_MAX_HW_EVENTS; + return true; }

static u32 hns3_pmu_get_filter_condition(struct perf_event *event)