drivers/perf: convert sysfs sprintf family to sysfs_emit

sprintf does not know the PAGE_SIZE maximum of the temporary buffer
used for sysfs content and it's possible to overrun the buffer length.

Use sysfs_emit() function to ensures that no overrun is done.

Signed-off-by: Qi Liu <liuqi115@huawei.com>
Link: https://lore.kernel.org/r/1616148273-16374-4-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/perf/arm_dmc620_pmu.c b/drivers/perf/arm_dmc620_pmu.c
index f2a8550..b6c2511 100644 (file)
--- a/drivers/perf/arm_dmc620_pmu.c
+++ b/drivers/perf/arm_dmc620_pmu.c
@@ -113,7 +113,7 @@ dmc620_pmu_event_show(struct device *dev,
 
        eattr = container_of(attr, typeof(*eattr), attr);
 
-       return sprintf(page, "event=0x%x,clkdiv2=0x%x\n", eattr->eventid, eattr->clkdiv2);
+       return sysfs_emit(page, "event=0x%x,clkdiv2=0x%x\n", eattr->eventid, eattr->clkdiv2);
 }
 
 #define DMC620_PMU_EVENT_ATTR(_name, _eventid, _clkdiv2)               \

diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
index fa9dfbc..45a399f 100644 (file)
--- a/drivers/perf/arm_smmuv3_pmu.c
+++ b/drivers/perf/arm_smmuv3_pmu.c
@@ -506,7 +506,7 @@ static ssize_t smmu_pmu_event_show(struct device *dev,
 
        pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
 
-       return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+       return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
 #define SMMU_EVENT_ATTR(name, config) \

diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index c126fd8..2bbb931 100644 (file)
--- a/drivers/perf/fsl_imx8_ddr_perf.c
+++ b/drivers/perf/fsl_imx8_ddr_perf.c
@@ -110,7 +110,7 @@ static ssize_t ddr_perf_identifier_show(struct device *dev,
 {
        struct ddr_pmu *pmu = dev_get_drvdata(dev);
 
-       return sprintf(page, "%s\n", pmu->devtype_data->identifier);
+       return sysfs_emit(page, "%s\n", pmu->devtype_data->identifier);
 }
 
 static umode_t ddr_perf_identifier_attr_visible(struct kobject *kobj,
@@ -219,7 +219,7 @@ ddr_pmu_event_show(struct device *dev, struct device_attribute *attr,
        struct perf_pmu_events_attr *pmu_attr;
 
        pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
-       return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+       return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
 #define IMX8_DDR_PMU_EVENT_ATTR(_name, _id)                            \

diff --git a/drivers/perf/hisilicon/hisi_uncore_pmu.c b/drivers/perf/hisilicon/hisi_uncore_pmu.c
index 64ccf5e..5e2b5e1 100644 (file)
--- a/drivers/perf/hisilicon/hisi_uncore_pmu.c
+++ b/drivers/perf/hisilicon/hisi_uncore_pmu.c
@@ -33,7 +33,7 @@ ssize_t hisi_format_sysfs_show(struct device *dev,
 
        eattr = container_of(attr, struct dev_ext_attribute, attr);
 
-       return sprintf(buf, "%s\n", (char *)eattr->var);
+       return sysfs_emit(buf, "%s\n", (char *)eattr->var);
 }
 EXPORT_SYMBOL_GPL(hisi_format_sysfs_show);
 
@@ -47,7 +47,7 @@ ssize_t hisi_event_sysfs_show(struct device *dev,
 
        eattr = container_of(attr, struct dev_ext_attribute, attr);
 
-       return sprintf(page, "config=0x%lx\n", (unsigned long)eattr->var);
+       return sysfs_emit(page, "config=0x%lx\n", (unsigned long)eattr->var);
 }
 EXPORT_SYMBOL_GPL(hisi_event_sysfs_show);
 
@@ -59,7 +59,7 @@ ssize_t hisi_cpumask_sysfs_show(struct device *dev,
 {
        struct hisi_pmu *hisi_pmu = to_hisi_pmu(dev_get_drvdata(dev));
 
-       return sprintf(buf, "%d\n", hisi_pmu->on_cpu);
+       return sysfs_emit(buf, "%d\n", hisi_pmu->on_cpu);
 }
 EXPORT_SYMBOL_GPL(hisi_cpumask_sysfs_show);
 

diff --git a/drivers/perf/qcom_l2_pmu.c b/drivers/perf/qcom_l2_pmu.c
index 8883af9..fc54a80 100644 (file)
--- a/drivers/perf/qcom_l2_pmu.c
+++ b/drivers/perf/qcom_l2_pmu.c
@@ -676,7 +676,7 @@ static ssize_t l2cache_pmu_event_show(struct device *dev,
        struct perf_pmu_events_attr *pmu_attr;
 
        pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
-       return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+       return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
 #define L2CACHE_EVENT_ATTR(_name, _id)                                      \

diff --git a/drivers/perf/qcom_l3_pmu.c b/drivers/perf/qcom_l3_pmu.c
index fb34b87..bba0780 100644 (file)
--- a/drivers/perf/qcom_l3_pmu.c
+++ b/drivers/perf/qcom_l3_pmu.c
@@ -615,7 +615,7 @@ static ssize_t l3cache_pmu_format_show(struct device *dev,
        struct dev_ext_attribute *eattr;
 
        eattr = container_of(attr, struct dev_ext_attribute, attr);
-       return sprintf(buf, "%s\n", (char *) eattr->var);
+       return sysfs_emit(buf, "%s\n", (char *) eattr->var);
 }
 
 #define L3CACHE_PMU_FORMAT_ATTR(_name, _config)                                      \
@@ -643,7 +643,7 @@ static ssize_t l3cache_pmu_event_show(struct device *dev,
        struct perf_pmu_events_attr *pmu_attr;
 
        pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
-       return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+       return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
 #define L3CACHE_EVENT_ATTR(_name, _id)                                      \

diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
index e116815..06a6d56 100644 (file)
--- a/drivers/perf/thunderx2_pmu.c
+++ b/drivers/perf/thunderx2_pmu.c
@@ -128,7 +128,7 @@ __tx2_pmu_##_var##_show(struct device *dev,                         \
                               char *page)                              \
 {                                                                      \
        BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);                     \
-       return sprintf(page, _format "\n");                             \
+       return sysfs_emit(page, _format "\n");                          \
 }                                                                      \
                                                                        \
 static struct device_attribute format_attr_##_var =                    \
@@ -176,7 +176,7 @@ static ssize_t tx2_pmu_event_show(struct device *dev,
        struct dev_ext_attribute *eattr;
 
        eattr = container_of(attr, struct dev_ext_attribute, attr);
-       return sprintf(buf, "event=0x%lx\n", (unsigned long) eattr->var);
+       return sysfs_emit(buf, "event=0x%lx\n", (unsigned long) eattr->var);
 }
 
 #define TX2_EVENT_ATTR(name, config) \

diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index 44faa51..ffe3bde 100644 (file)
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -170,7 +170,7 @@ static ssize_t xgene_pmu_format_show(struct device *dev,
        struct dev_ext_attribute *eattr;
 
        eattr = container_of(attr, struct dev_ext_attribute, attr);
-       return sprintf(buf, "%s\n", (char *) eattr->var);
+       return sysfs_emit(buf, "%s\n", (char *) eattr->var);
 }
 
 #define XGENE_PMU_FORMAT_ATTR(_name, _config)          \
@@ -281,7 +281,7 @@ static ssize_t xgene_pmu_event_show(struct device *dev,
        struct dev_ext_attribute *eattr;
 
        eattr = container_of(attr, struct dev_ext_attribute, attr);
-       return sprintf(buf, "config=0x%lx\n", (unsigned long) eattr->var);
+       return sysfs_emit(buf, "config=0x%lx\n", (unsigned long) eattr->var);
 }
 
 #define XGENE_PMU_EVENT_ATTR(_name, _config)           \