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perf/x86: fix sysfs type mismatches

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This change switches rapl to use PMU_FORMAT_ATTR, and fixes two other
macros to use device_attribute instead of kobj_attribute to avoid
callback type mismatches that trip indirect call checking with Clang's
Control-Flow Integrity (CFI).

Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20201113183126.1239404-1-samitolvanen@google.com
This commit is contained in:
Sami Tolvanen 2020-11-13 10:31:26 -08:00 committed by Peter Zijlstra
parent 1a8cfa24e2
commit ebd19fc372
4 changed files with 12 additions and 24 deletions
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6
arch/x86/events/intel/cstate.c
View File

@ -107,14 +107,14 @@
MODULE_LICENSE("GPL");
#define DEFINE_CSTATE_FORMAT_ATTR(_var, _name, _format) \
static ssize_t __cstate_##_var##_show(struct kobject *kobj, \
struct kobj_attribute *attr, \
static ssize_t __cstate_##_var##_show(struct device *dev, \
struct device_attribute *attr, \
char *page) \
{ \
BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
return sprintf(page, _format "\n"); \
} \
static struct kobj_attribute format_attr_##_var = \
static struct device_attribute format_attr_##_var = \
__ATTR(_name, 0444, __cstate_##_var##_show, NULL)
static ssize_t cstate_get_attr_cpumask(struct device *dev,

4
arch/x86/events/intel/uncore.c
View File

@ -94,8 +94,8 @@ struct pci2phy_map *__find_pci2phy_map(int segment)
return map;
}
ssize_t uncore_event_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
ssize_t uncore_event_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uncore_event_desc *event =
container_of(attr, struct uncore_event_desc, attr);

12
arch/x86/events/intel/uncore.h
View File

@ -157,7 +157,7 @@ struct intel_uncore_box {
#define UNCORE_BOX_FLAG_CFL8_CBOX_MSR_OFFS 2
struct uncore_event_desc {
struct kobj_attribute attr;
struct device_attribute attr;
const char *config;
};
@ -179,8 +179,8 @@ struct pci2phy_map {
struct pci2phy_map *__find_pci2phy_map(int segment);
int uncore_pcibus_to_physid(struct pci_bus *bus);
ssize_t uncore_event_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf);
ssize_t uncore_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
static inline struct intel_uncore_pmu *dev_to_uncore_pmu(struct device *dev)
{
@ -201,14 +201,14 @@ extern int __uncore_max_dies;
}
#define DEFINE_UNCORE_FORMAT_ATTR(_var, _name, _format) \
static ssize_t __uncore_##_var##_show(struct kobject *kobj, \
struct kobj_attribute *attr, \
static ssize_t __uncore_##_var##_show(struct device *dev, \
struct device_attribute *attr, \
char *page) \
{ \
BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
return sprintf(page, _format "\n"); \
} \
static struct kobj_attribute format_attr_##_var = \
static struct device_attribute format_attr_##_var = \
__ATTR(_name, 0444, __uncore_##_var##_show, NULL)
static inline bool uncore_pmc_fixed(int idx)

14
arch/x86/events/rapl.c
View File

@ -93,18 +93,6 @@ static const char *const rapl_domain_names[NR_RAPL_DOMAINS] __initconst = {
* any other bit is reserved
*/
#define RAPL_EVENT_MASK 0xFFULL
#define DEFINE_RAPL_FORMAT_ATTR(_var, _name, _format) \
static ssize_t __rapl_##_var##_show(struct kobject *kobj, \
struct kobj_attribute *attr, \
char *page) \
{ \
BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
return sprintf(page, _format "\n"); \
} \
static struct kobj_attribute format_attr_##_var = \
__ATTR(_name, 0444, __rapl_##_var##_show, NULL)
#define RAPL_CNTR_WIDTH 32
#define RAPL_EVENT_ATTR_STR(_name, v, str) \
@ -441,7 +429,7 @@ static struct attribute_group rapl_pmu_events_group = {
.attrs = attrs_empty,
};
DEFINE_RAPL_FORMAT_ATTR(event, event, "config:0-7");
PMU_FORMAT_ATTR(event, "config:0-7");
static struct attribute *rapl_formats_attr[] = {
&format_attr_event.attr,
NULL,