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authorRuidong Tian <tianruidong@linux.alibaba.com>2023-08-04 16:15:14 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-09-23 10:59:50 +0200
commitc9e6c1fefcd5a9056febb651741bff9c07f5d793 (patch)
tree64affcedceb708c73e6bb51f8f79404321e9942e
parent463934ca5d9810028fa341fc36a53bd4cddad4e0 (diff)
coresight: tmc: Explicit type conversions to prevent integer overflow
[ Upstream commit fd380097cdb305582b7a1f9476391330299d2c59 ] Perf cs_etm session executed unexpectedly when AUX buffer > 1G. perf record -C 0 -m ,2G -e cs_etm// -- <workload> [ perf record: Captured and wrote 2.615 MB perf.data ] Perf only collect about 2M perf data rather than 2G. This is becasuse the operation, "nr_pages << PAGE_SHIFT", in coresight tmc driver, will overflow when nr_pages >= 0x80000(correspond to 1G AUX buffer). The overflow cause buffer allocation to fail, and TMC driver will alloc minimal buffer size(1M). You can just get about 2M perf data(1M AUX buffer + perf data header) at least. Explicit convert nr_pages to 64 bit to avoid overflow. Fixes: 22f429f19c41 ("coresight: etm-perf: Add support for ETR backend") Fixes: 99443ea19e8b ("coresight: Add generic TMC sg table framework") Fixes: 2e499bbc1a92 ("coresight: tmc: implementing TMC-ETF AUX space API") Signed-off-by: Ruidong Tian <tianruidong@linux.alibaba.com> Reviewed-by: James Clark <james.clark@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20230804081514.120171-2-tianruidong@linux.alibaba.com Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etf.c2
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c5
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc.h2
3 files changed, 5 insertions, 4 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 75dfa1e2f3f2..e15726611c64 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -426,7 +426,7 @@ static int tmc_set_etf_buffer(struct coresight_device *csdev,
return -EINVAL;
/* wrap head around to the amount of space we have */
- head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1);
+ head = handle->head & (((unsigned long)buf->nr_pages << PAGE_SHIFT) - 1);
/* find the page to write to */
buf->cur = head / PAGE_SIZE;
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 763463776a0e..2a0a12c194c0 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -47,7 +47,8 @@ struct etr_perf_buffer {
};
/* Convert the perf index to an offset within the ETR buffer */
-#define PERF_IDX2OFF(idx, buf) ((idx) % ((buf)->nr_pages << PAGE_SHIFT))
+#define PERF_IDX2OFF(idx, buf) \
+ ((idx) % ((unsigned long)(buf)->nr_pages << PAGE_SHIFT))
/* Lower limit for ETR hardware buffer */
#define TMC_ETR_PERF_MIN_BUF_SIZE SZ_1M
@@ -1215,7 +1216,7 @@ alloc_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
* than the size requested via sysfs.
*/
if ((nr_pages << PAGE_SHIFT) > drvdata->size) {
- etr_buf = tmc_alloc_etr_buf(drvdata, (nr_pages << PAGE_SHIFT),
+ etr_buf = tmc_alloc_etr_buf(drvdata, ((ssize_t)nr_pages << PAGE_SHIFT),
0, node, NULL);
if (!IS_ERR(etr_buf))
goto done;
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 71de978575f3..1fcf6e29e8d3 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -320,7 +320,7 @@ ssize_t tmc_sg_table_get_data(struct tmc_sg_table *sg_table,
static inline unsigned long
tmc_sg_table_buf_size(struct tmc_sg_table *sg_table)
{
- return sg_table->data_pages.nr_pages << PAGE_SHIFT;
+ return (unsigned long)sg_table->data_pages.nr_pages << PAGE_SHIFT;
}
struct coresight_device *tmc_etr_get_catu_device(struct tmc_drvdata *drvdata);