From f4f4dd0c45676fa3fc7683046f3acc862a088fed Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Tue, 17 May 2016 09:26:14 +0200 Subject: [PATCH] clk: samsung: Suppress unbinding to prevent theoretical attacks Although unbinding a driver requires root privileges but it still might be used theoretically in certain attacks (by triggering NULL pointer exception or memory corruption if driver does not provide proper remove callbacks or core does not handle it). Samsung clock drivers are essential for system operation so their removal is not expected. More over, the Exynos3250 ISP clock driver does not implement remove() driver callback and it is not buildable as modules. Suppress the unbind interface for Exynos3250 ISP and S3C2410 DCLK clock drivers. Suggested-by: Marek Szyprowski Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sylwester Nawrocki --- drivers/clk/samsung/clk-exynos3250.c | 1 + drivers/clk/samsung/clk-s3c2410-dclk.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/clk/samsung/clk-exynos3250.c b/drivers/clk/samsung/clk-exynos3250.c index b2513959252d..1b81e283f605 100644 --- a/drivers/clk/samsung/clk-exynos3250.c +++ b/drivers/clk/samsung/clk-exynos3250.c @@ -1087,6 +1087,7 @@ static const struct of_device_id exynos3250_cmu_isp_of_match[] __initconst = { static struct platform_driver exynos3250_cmu_isp_driver __initdata = { .driver = { .name = "exynos3250-cmu-isp", + .suppress_bind_attrs = true, .of_match_table = exynos3250_cmu_isp_of_match, }, }; diff --git a/drivers/clk/samsung/clk-s3c2410-dclk.c b/drivers/clk/samsung/clk-s3c2410-dclk.c index ec6fb14d951c..ae9a595c72d0 100644 --- a/drivers/clk/samsung/clk-s3c2410-dclk.c +++ b/drivers/clk/samsung/clk-s3c2410-dclk.c @@ -428,8 +428,9 @@ MODULE_DEVICE_TABLE(platform, s3c24xx_dclk_driver_ids); static struct platform_driver s3c24xx_dclk_driver = { .driver = { - .name = "s3c24xx-dclk", - .pm = &s3c24xx_dclk_pm_ops, + .name = "s3c24xx-dclk", + .pm = &s3c24xx_dclk_pm_ops, + .suppress_bind_attrs = true, }, .probe = s3c24xx_dclk_probe, .remove = s3c24xx_dclk_remove, -- 2.20.1