[PATCH v3 1/5] drm/msm/dpu: don't allow overriding data from catalog

[Dmitry Baryshkov]

The data from catalog is marked as const, so it is a part of the RO
segment. Allowing userspace to write to it through debugfs can cause
protection faults. Set debugfs file mode to read-only for debug entries
corresponding to perf_cfg coming from catalog.

Fixes: abda0d925f9c ("drm/msm/dpu: Mark various data tables as const")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
index ef871239adb2..68fae048a9a8 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
@@ -459,15 +459,15 @@ int dpu_core_perf_debugfs_init(struct dpu_kms *dpu_kms, struct dentry *parent)
 			&perf->core_clk_rate);
 	debugfs_create_u32("enable_bw_release", 0600, entry,
 			(u32 *)&perf->enable_bw_release);
-	debugfs_create_u32("threshold_low", 0600, entry,
+	debugfs_create_u32("threshold_low", 0400, entry,
 			(u32 *)&perf->perf_cfg->max_bw_low);
-	debugfs_create_u32("threshold_high", 0600, entry,
+	debugfs_create_u32("threshold_high", 0400, entry,
 			(u32 *)&perf->perf_cfg->max_bw_high);
-	debugfs_create_u32("min_core_ib", 0600, entry,
+	debugfs_create_u32("min_core_ib", 0400, entry,
 			(u32 *)&perf->perf_cfg->min_core_ib);
-	debugfs_create_u32("min_llcc_ib", 0600, entry,
+	debugfs_create_u32("min_llcc_ib", 0400, entry,
 			(u32 *)&perf->perf_cfg->min_llcc_ib);
-	debugfs_create_u32("min_dram_ib", 0600, entry,
+	debugfs_create_u32("min_dram_ib", 0400, entry,
 			(u32 *)&perf->perf_cfg->min_dram_ib);
 	debugfs_create_file("perf_mode", 0600, entry,
 			(u32 *)perf, &dpu_core_perf_mode_fops);

-- 
2.39.2