linux-hardening - [PATCH] thermal: int340x: Fix attr.show callback prototype

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Date:   Thu, 21 Apr 2022 09:55:04 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        linux-pm@...r.kernel.org, Joao Moreira <joao@...rdrivepizza.com>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Chuansheng Liu <chuansheng.liu@...el.com>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>,
        Matthew Garrett <mjg59@...gle.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] thermal: int340x: Fix attr.show callback prototype

Control Flow Integrity (CFI) instrumentation of the kernel noticed that
the caller, dev_attr_show(), and the callback, odvp_show(), did not have
matching function prototypes, which would cause a CFI exception to be
raised. Correct the prototype by using struct device_attribute instead
of struct kobj_attribute.

Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Amit Kucheria <amitk@...nel.org>
Cc: Zhang Rui <rui.zhang@...el.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: linux-pm@...r.kernel.org
Reported-and-tested-by: Joao Moreira <joao@...rdrivepizza.com>
Link: https://lore.kernel.org/lkml/067ce8bd4c3968054509831fa2347f4f@overdrivepizza.com/
Fixes: 006f006f1e5c ("thermal/int340x_thermal: Export OEM vendor variables")
Cc: stable@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/thermal/intel/int340x_thermal/int3400_thermal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
index 4954800b9850..d97f496bab9b 100644
--- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
+++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
@@ -68,7 +68,7 @@ static int evaluate_odvp(struct int3400_thermal_priv *priv);
 struct odvp_attr {
 	int odvp;
 	struct int3400_thermal_priv *priv;
-	struct kobj_attribute attr;
+	struct device_attribute attr;
 };
 
 static ssize_t data_vault_read(struct file *file, struct kobject *kobj,
@@ -311,7 +311,7 @@ static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 	return result;
 }
 
-static ssize_t odvp_show(struct kobject *kobj, struct kobj_attribute *attr,
+static ssize_t odvp_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
 	struct odvp_attr *odvp_attr;
-- 
2.32.0