perf/arm-cci: Remove VLA usage

In the quest to remove all stack VLA usage from the kernel[1], this
removes the VLA in favor of a maximum size and adds a sanity check
at registration time. The sizes are all explicitly enumerated already,
so this just collects them into macros.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 0d09d8e..1bfeb16 100644 (file)
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -53,6 +53,16 @@ enum {
        CCI_IF_MAX,
 };
 
+#define NUM_HW_CNTRS_CII_4XX   4
+#define NUM_HW_CNTRS_CII_5XX   8
+#define NUM_HW_CNTRS_MAX       NUM_HW_CNTRS_CII_5XX
+
+#define FIXED_HW_CNTRS_CII_4XX 1
+#define FIXED_HW_CNTRS_CII_5XX 0
+#define FIXED_HW_CNTRS_MAX     FIXED_HW_CNTRS_CII_4XX
+
+#define HW_CNTRS_MAX           (NUM_HW_CNTRS_MAX + FIXED_HW_CNTRS_MAX)
+
 struct event_range {
        u32 min;
        u32 max;
@@ -633,8 +643,7 @@ static void cci_pmu_sync_counters(struct cci_pmu *cci_pmu)
 {
        int i;
        struct cci_pmu_hw_events *cci_hw = &cci_pmu->hw_events;
-
-       DECLARE_BITMAP(mask, cci_pmu->num_cntrs);
+       DECLARE_BITMAP(mask, HW_CNTRS_MAX);
 
        bitmap_zero(mask, cci_pmu->num_cntrs);
        for_each_set_bit(i, cci_pmu->hw_events.used_mask, cci_pmu->num_cntrs) {
@@ -940,7 +949,7 @@ static void pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
 static void cci5xx_pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask)
 {
        int i;
-       DECLARE_BITMAP(saved_mask, cci_pmu->num_cntrs);
+       DECLARE_BITMAP(saved_mask, HW_CNTRS_MAX);
 
        bitmap_zero(saved_mask, cci_pmu->num_cntrs);
        pmu_save_counters(cci_pmu, saved_mask);
@@ -1245,7 +1254,7 @@ static int validate_group(struct perf_event *event)
 {
        struct perf_event *sibling, *leader = event->group_leader;
        struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
-       unsigned long mask[BITS_TO_LONGS(cci_pmu->num_cntrs)];
+       unsigned long mask[BITS_TO_LONGS(HW_CNTRS_MAX)];
        struct cci_pmu_hw_events fake_pmu = {
                /*
                 * Initialise the fake PMU. We only need to populate the
@@ -1403,6 +1412,11 @@ static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev)
        char *name = model->name;
        u32 num_cntrs;
 
+       if (WARN_ON(model->num_hw_cntrs > NUM_HW_CNTRS_MAX))
+               return -EINVAL;
+       if (WARN_ON(model->fixed_hw_cntrs > FIXED_HW_CNTRS_MAX))
+               return -EINVAL;
+
        pmu_event_attr_group.attrs = model->event_attrs;
        pmu_format_attr_group.attrs = model->format_attrs;
 
@@ -1455,8 +1469,8 @@ static __maybe_unused struct cci_pmu_model cci_pmu_models[] = {
 #ifdef CONFIG_ARM_CCI400_PMU
        [CCI400_R0] = {
                .name = "CCI_400",
-               .fixed_hw_cntrs = 1,    /* Cycle counter */
-               .num_hw_cntrs = 4,
+               .fixed_hw_cntrs = FIXED_HW_CNTRS_CII_4XX, /* Cycle counter */
+               .num_hw_cntrs = NUM_HW_CNTRS_CII_4XX,
                .cntr_size = SZ_4K,
                .format_attrs = cci400_pmu_format_attrs,
                .event_attrs = cci400_r0_pmu_event_attrs,
@@ -1475,8 +1489,8 @@ static __maybe_unused struct cci_pmu_model cci_pmu_models[] = {
        },
        [CCI400_R1] = {
                .name = "CCI_400_r1",
-               .fixed_hw_cntrs = 1,    /* Cycle counter */
-               .num_hw_cntrs = 4,
+               .fixed_hw_cntrs = FIXED_HW_CNTRS_CII_4XX, /* Cycle counter */
+               .num_hw_cntrs = NUM_HW_CNTRS_CII_4XX,
                .cntr_size = SZ_4K,
                .format_attrs = cci400_pmu_format_attrs,
                .event_attrs = cci400_r1_pmu_event_attrs,
@@ -1497,8 +1511,8 @@ static __maybe_unused struct cci_pmu_model cci_pmu_models[] = {
 #ifdef CONFIG_ARM_CCI5xx_PMU
        [CCI500_R0] = {
                .name = "CCI_500",
-               .fixed_hw_cntrs = 0,
-               .num_hw_cntrs = 8,
+               .fixed_hw_cntrs = FIXED_HW_CNTRS_CII_5XX,
+               .num_hw_cntrs = NUM_HW_CNTRS_CII_5XX,
                .cntr_size = SZ_64K,
                .format_attrs = cci5xx_pmu_format_attrs,
                .event_attrs = cci5xx_pmu_event_attrs,
@@ -1521,8 +1535,8 @@ static __maybe_unused struct cci_pmu_model cci_pmu_models[] = {
        },
        [CCI550_R0] = {
                .name = "CCI_550",
-               .fixed_hw_cntrs = 0,
-               .num_hw_cntrs = 8,
+               .fixed_hw_cntrs = FIXED_HW_CNTRS_CII_5XX,
+               .num_hw_cntrs = NUM_HW_CNTRS_CII_5XX,
                .cntr_size = SZ_64K,
                .format_attrs = cci5xx_pmu_format_attrs,
                .event_attrs = cci5xx_pmu_event_attrs,