linux-kernel - [PATCH] KVM: x86: Use sysfs

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Date:   Sun, 25 Jun 2023 15:34:38 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: x86: Use sysfs_emit() instead of sprintf()

From: Like Xu <likexu@...cent.com>

Use sysfs_emit() instead of the sprintf() for sysfs entries. sysfs_emit()
knows the maximum of the temporary buffer used for outputting sysfs
content and avoids overrunning the buffer length.

Signed-off-by: Like Xu <likexu@...cent.com>
---
 arch/x86/kvm/mmu/mmu.c | 2 +-
 arch/x86/kvm/vmx/vmx.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 60397a1beda3..78f6f816c7d1 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6862,7 +6862,7 @@ static void mmu_destroy_caches(void)
 static int get_nx_huge_pages(char *buffer, const struct kernel_param *kp)
 {
 	if (nx_hugepage_mitigation_hard_disabled)
-		return sprintf(buffer, "never\n");
+		return sysfs_emit(buffer, "never\n");
 
 	return param_get_bool(buffer, kp);
 }
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 0ecf4be2c6af..254f2296e549 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -366,9 +366,9 @@ static int vmentry_l1d_flush_set(const char *s, const struct kernel_param *kp)
 static int vmentry_l1d_flush_get(char *s, const struct kernel_param *kp)
 {
 	if (WARN_ON_ONCE(l1tf_vmx_mitigation >= ARRAY_SIZE(vmentry_l1d_param)))
-		return sprintf(s, "???\n");
+		return sysfs_emit(s, "???\n");
 
-	return sprintf(s, "%s\n", vmentry_l1d_param[l1tf_vmx_mitigation].option);
+	return sysfs_emit(s, "%s\n", vmentry_l1d_param[l1tf_vmx_mitigation].option);
 }
 
 static void vmx_setup_fb_clear_ctrl(void)
-- 
2.41.0