6.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Junhao He <hejunhao3@xxxxxxxxxx>
[ Upstream commit 77fce82678ea5fd51442e62febec2004f79e041b ]
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@xxxxxxxxxx>
Reviewed-by: Jijie Shao <shaojijie@xxxxxxxxxx>
Acked-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240425124627.13764-2-hejunhao3@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 b90ba8aca3fa5..ec4d5fc30781c 100644
--- a/drivers/perf/hisilicon/hisi_pcie_pmu.c
+++ b/drivers/perf/hisilicon/hisi_pcie_pmu.c
@@ -337,15 +337,27 @@ 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)
--
2.43.0
