This is a note to let you know that I've just added the patch titled
arm64: perf: Convert snprintf to sysfs_emit
to the 5.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-perf-convert-snprintf-to-sysfs_emit.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit da9adeb69edb732b195886cbe800468dddf0ca62
Author: Tian Tao <tiantao6@xxxxxxxxxxxxx>
Date: Thu May 20 15:59:45 2021 +0800
arm64: perf: Convert snprintf to sysfs_emit
[ Upstream commit a5740e955540181f4ab8f076cc9795c6bbe4d730 ]
Use sysfs_emit instead of snprintf to avoid buf overrun,because in
sysfs_emit it strictly checks whether buf is null or buf whether
pagesize aligned, otherwise it returns an error.
Signed-off-by: Tian Tao <tiantao6@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1621497585-30887-1-git-send-email-tiantao6@xxxxxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 4658fcf88c2b..3baca49fcf6b 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -312,7 +312,7 @@ static ssize_t slots_show(struct device *dev, struct device_attribute *attr,
struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
u32 slots = cpu_pmu->reg_pmmir & ARMV8_PMU_SLOTS_MASK;
- return snprintf(page, PAGE_SIZE, "0x%08x\n", slots);
+ return sysfs_emit(page, "0x%08x\n", slots);
}
static DEVICE_ATTR_RO(slots);
