linux-kernel - [PATCH AUTOSEL 5.4 21/23] perf/x86: fix sysfs type mismatches

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Message-Id: <20201125153638.810419-21-sashal@kernel.org>
Date:   Wed, 25 Nov 2020 10:36:36 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Sasha Levin <sashal@...nel.org>,
        clang-built-linux@...glegroups.com
Subject: [PATCH AUTOSEL 5.4 21/23] perf/x86: fix sysfs type mismatches

From: Sami Tolvanen <samitolvanen@...gle.com>

[ Upstream commit ebd19fc372e3e78bf165f230e7c084e304441c08 ]

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@...il.com>
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Link: https://lkml.kernel.org/r/20201113183126.1239404-1-samitolvanen@google.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/events/intel/cstate.c |  6 +++---
 arch/x86/events/intel/uncore.c |  4 ++--
 arch/x86/events/intel/uncore.h | 12 ++++++------
 arch/x86/events/rapl.c         | 14 +-------------
 4 files changed, 12 insertions(+), 24 deletions(-)

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index 4814c964692cb..0b50119ea12cc 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -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,
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 86467f85c3831..a335be03aeef1 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -92,8 +92,8 @@ 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);
diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index bbfdaa720b456..7b964c63e993c 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -144,7 +144,7 @@ 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;
 };
 
@@ -165,8 +165,8 @@ 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);
 
 #define INTEL_UNCORE_EVENT_DESC(_name, _config)			\
 {								\
@@ -175,14 +175,14 @@ ssize_t uncore_event_show(struct kobject *kobj,
 }
 
 #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)
diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index 187c72a58e69c..9050d7b8abc5a 100644
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -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)					\
@@ -433,7 +421,7 @@ 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,
-- 
2.27.0