From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 539A939936D; Tue, 2 Jun 2026 23:54:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780444498; cv=none; b=uEAWzQ437oYC/zYCm3eLtTCVM1cRVX4WWQo52SblBrBBEb9rp9fPAwRitEzSbDBaPFuWRDzQ5QGwLtJOggcwbtr4a5VVYL+WYVeaciAMn6oZwqF/JsNhxlYm0SfT5S/0UDwEymbCyAcvhlVmkMomH5AzmPWxDujQjl2L63dR3Ec= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780444498; c=relaxed/simple; bh=9C8DQw0flKH0sM335ms4ayLG4jw5+1Dwb3103XIomUk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=q7wxix9vTTGrR7kJNdQGxDiNNFagmzVnuddfJApyELPbpeY4HQdoSjscxfXG4vxjfbF75I6mAhxfpAU2zlM17WQwqAeBQ0/f5DsdSO+k0fJMeAcvf7HTHQvhc7Tz7wcufRUmoB9vhcbwuQC7VkayRWYlLdGGEaoHrOdZUyqeUX4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WkVkjvwP; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WkVkjvwP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 126101F0089A; Tue, 2 Jun 2026 23:54:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780444496; bh=0x6QdNpCBv6Ii/bbNu324c1LO1y8u1r1+aTEfVKd050=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=WkVkjvwPfuN+Z9MaUcb6tGtodaynhsAlbysX2XQuO6RYPO1QgDg4rc094dDQ30a1n FxPWPCse48KCXe+7XjcjGezzuUWAUxfNRwbgyHhaapE5a631Z65mt5AR+QMuL3qytU NsNyU0LJtll9v0iWRnKWtyS1Y7zSpiUPkxqhpxJUlDHY5L00wsNxz1gd8fp0DGHLF0 7kCpzsjw79LAYewk67+4AmSITUnAWt2URUqd6AbTipz/93MLn7+1jPI2RoNXRo3b+v w1xefwZ9QcfV3P9BN8FYuazVRYq6jAt5yh0jxW+m03gOxabPvNOc5iaftTluvuUJsV XddUOG36lUpow== From: Oliver Upton To: kvmarm@lists.linux.dev Cc: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Wei-Lin Chang , Oliver Upton , stable@vger.kernel.org Subject: [PATCH 1/5] KVM: arm64: Don't leak PFN when kvm_translate_vncr() races MMU notifier Date: Tue, 2 Jun 2026 16:54:46 -0700 Message-ID: <20260602235450.103057-2-oupton@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260602235450.103057-1-oupton@kernel.org> References: <20260602235450.103057-1-oupton@kernel.org> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In the case that kvm_translate_vncr() races with an MMU notifier the early return does not release a reference on the faulted in PFN. Add the necessary call to kvm_release_faultin_page() for the unused PFN. Cc: stable@vger.kernel.org Fixes: 069a05e535496 ("KVM: arm64: nv: Handle VNCR_EL2-triggered faults") Reported-by: Sashiko (local):gemini-3.1-pro Signed-off-by: Oliver Upton --- arch/arm64/kvm/nested.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index 883b6c1008fb..4fa82e96454d 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -1326,8 +1326,10 @@ static int kvm_translate_vncr(struct kvm_vcpu *vcpu, bool *is_gmem) } scoped_guard(write_lock, &vcpu->kvm->mmu_lock) { - if (mmu_invalidate_retry(vcpu->kvm, mmu_seq)) + if (mmu_invalidate_retry(vcpu->kvm, mmu_seq)) { + kvm_release_faultin_page(vcpu->kvm, page, true, false); return -EAGAIN; + } vt->gva = va; vt->hpa = pfn << PAGE_SHIFT; -- 2.47.3