linux-hardening - Re: [RFC PATCH 11/11] driver/int3400

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Message-ID: <202204201601.8291F550@keescook>
Date:   Wed, 20 Apr 2022 16:04:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joao Moreira <joao@...rdrivepizza.com>
Cc:     linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        peterz@...radead.org, jpoimboe@...hat.com,
        andrew.cooper3@...rix.com, samitolvanen@...gle.com,
        mark.rutland@....com, hjl.tools@...il.com,
        alyssa.milburn@...ux.intel.com, ndesaulniers@...gle.com,
        gabriel.gomes@...ux.intel.com, rick.p.edgecombe@...el.com
Subject: Re: [RFC PATCH 11/11] driver/int3400_thermal: Fix prototype matching

On Wed, Apr 20, 2022 at 03:28:20PM -0700, Joao Moreira wrote:
> > Where/why is the mismatch happening?
> 
> Mismatch happens in dev_attr_show from drivers/base/core.c. There, kobject *
> is cast to device * before the call, probably because attr is also cast to
> device_attribute, which may have a mismatching hook prototype, I guess.

Ah-ha, thanks. I think this will fix it, but I haven't tested it:

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;


-- 
Kees Cook