4.9-stable review patch. If anyone has any objections, please let me know.
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From: Viresh Kumar viresh.kumar@linaro.org
commit 625c85a62cb7d3c79f6e16de3cfa972033658250 upstream.
The cpufreq_global_kobject is created using kobject_create_and_add() helper, which assigns the kobj_type as dynamic_kobj_ktype and show/store routines are set to kobj_attr_show() and kobj_attr_store().
These routines pass struct kobj_attribute as an argument to the show/store callbacks. But all the cpufreq files created using the cpufreq_global_kobject expect the argument to be of type struct attribute. Things work fine currently as no one accesses the "attr" argument. We may not see issues even if the argument is used, as struct kobj_attribute has struct attribute as its first element and so they will both get same address.
But this is logically incorrect and we should rather use struct kobj_attribute instead of struct global_attr in the cpufreq core and drivers and the show/store callbacks should take struct kobj_attribute as argument instead.
This bug is caught using CFI CLANG builds in android kernel which catches mismatch in function prototypes for such callbacks.
Reported-by: Donghee Han dh.han@samsung.com Reported-by: Sangkyu Kim skwith.kim@samsung.com Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/cpufreq/cpufreq.c | 6 +++--- drivers/cpufreq/intel_pstate.c | 14 +++++++------- include/linux/cpufreq.h | 12 ++---------- 3 files changed, 12 insertions(+), 20 deletions(-)
--- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -528,13 +528,13 @@ EXPORT_SYMBOL_GPL(cpufreq_driver_resolve * SYSFS INTERFACE * *********************************************************************/ static ssize_t show_boost(struct kobject *kobj, - struct attribute *attr, char *buf) + struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); }
-static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, - const char *buf, size_t count) +static ssize_t store_boost(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) { int ret, enable;
--- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -659,13 +659,13 @@ static void __init intel_pstate_debug_ex /************************** sysfs begin ************************/ #define show_one(file_name, object) \ static ssize_t show_##file_name \ - (struct kobject *kobj, struct attribute *attr, char *buf) \ + (struct kobject *kobj, struct kobj_attribute *attr, char *buf) \ { \ return sprintf(buf, "%u\n", limits->object); \ }
static ssize_t show_turbo_pct(struct kobject *kobj, - struct attribute *attr, char *buf) + struct kobj_attribute *attr, char *buf) { struct cpudata *cpu; int total, no_turbo, turbo_pct; @@ -681,7 +681,7 @@ static ssize_t show_turbo_pct(struct kob }
static ssize_t show_num_pstates(struct kobject *kobj, - struct attribute *attr, char *buf) + struct kobj_attribute *attr, char *buf) { struct cpudata *cpu; int total; @@ -692,7 +692,7 @@ static ssize_t show_num_pstates(struct k }
static ssize_t show_no_turbo(struct kobject *kobj, - struct attribute *attr, char *buf) + struct kobj_attribute *attr, char *buf) { ssize_t ret;
@@ -705,7 +705,7 @@ static ssize_t show_no_turbo(struct kobj return ret; }
-static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, +static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b, const char *buf, size_t count) { unsigned int input; @@ -729,7 +729,7 @@ static ssize_t store_no_turbo(struct kob return count; }
-static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, +static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b, const char *buf, size_t count) { unsigned int input; @@ -753,7 +753,7 @@ static ssize_t store_max_perf_pct(struct return count; }
-static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, +static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b, const char *buf, size_t count) { unsigned int input; --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -234,20 +234,12 @@ __ATTR(_name, _perm, show_##_name, NULL) static struct freq_attr _name = \ __ATTR(_name, 0644, show_##_name, store_##_name)
-struct global_attr { - struct attribute attr; - ssize_t (*show)(struct kobject *kobj, - struct attribute *attr, char *buf); - ssize_t (*store)(struct kobject *a, struct attribute *b, - const char *c, size_t count); -}; - #define define_one_global_ro(_name) \ -static struct global_attr _name = \ +static struct kobj_attribute _name = \ __ATTR(_name, 0444, show_##_name, NULL)
#define define_one_global_rw(_name) \ -static struct global_attr _name = \ +static struct kobj_attribute _name = \ __ATTR(_name, 0644, show_##_name, store_##_name)