[PATCH 5.4 167/244] x86/events/amd/iommu: Fix sysfs type mismatch

From: Greg Kroah-Hartman
Date: Wed May 12 2021 - 11:09:06 EST


From: Nathan Chancellor <nathan@xxxxxxxxxx>

[ Upstream commit de5bc7b425d4c27ae5faa00ea7eb6b9780b9a355 ]

dev_attr_show() calls _iommu_event_show() via an indirect call but
_iommu_event_show()'s type does not currently match the type of the
show() member in 'struct device_attribute', resulting in a Control Flow
Integrity violation.

$ cat /sys/devices/amd_iommu_1/events/mem_dte_hit
csource=0x0a

$ dmesg | grep "CFI failure"
[ 3526.735140] CFI failure (target: _iommu_event_show...):

Change _iommu_event_show() and 'struct amd_iommu_event_desc' to
'struct device_attribute' so that there is no more CFI violation.

Fixes: 7be6296fdd75 ("perf/x86/amd: AMD IOMMU Performance Counter PERF uncore PMU implementation")
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20210415001112.3024673-1-nathan@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/x86/events/amd/iommu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c
index be50ef8572cc..6a98a7651621 100644
--- a/arch/x86/events/amd/iommu.c
+++ b/arch/x86/events/amd/iommu.c
@@ -81,12 +81,12 @@ static struct attribute_group amd_iommu_events_group = {
};

struct amd_iommu_event_desc {
- struct kobj_attribute attr;
+ struct device_attribute attr;
const char *event;
};

-static ssize_t _iommu_event_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
+static ssize_t _iommu_event_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct amd_iommu_event_desc *event =
container_of(attr, struct amd_iommu_event_desc, attr);
--
2.30.2