From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 C6F921AE876 for ; Wed, 4 Dec 2024 23:22:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733354579; cv=none; b=TEyVIwMFXUSjhHgjaXO6h7vve11TVOSLMBA2KAtUreLEs55MtZ6IRG1o7yiCIDKqBQoqWwiFq+7ECgSTQ0JM/8x7q5x64AhQyCZavHk+NZqGYsvAE6n7aebMNeJ7WJ6adYeQAMxjzBqOR1E7Xde2QZOte1+6n2kjdPxBg3JdZBg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733354579; c=relaxed/simple; bh=lSHwjtu09Tma0VkzEhw7YJkcLkQyZ9d14tpt8MwwnaE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hsPkwoOXrt5IbLoCPZjlwMM0LKp4hoT5J3BabeihSu28yh1DVkhCjPlR/IzdmSF2vc1NuRBEQMpenPIlvtyj2wpAYZ2/1sm/PjB9MQt5SiyKTsBltO9haLbWoseVl951eLlqaZTvARXX9wdVbAdKLj3Pvz2i18OvLBXpZwFz1zA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PTK3WHUx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PTK3WHUx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DAA5C4CECD; Wed, 4 Dec 2024 23:22:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733354579; bh=lSHwjtu09Tma0VkzEhw7YJkcLkQyZ9d14tpt8MwwnaE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PTK3WHUxubCCMcKGIz6jK3y2ddD9ihlELNx5JWYqj6m3nqWxtJ/IAX9XBncUykixk kEaxYaLmoeG8hnefvt+QdrNHDMPtosTUbegihTM+AdV82xx/dmUV1MTSAGQgYRsLcu 0x4nHgF5Az6i/9f3L+CyeWCGkRVrC81cHyYEYItYaJ0C56Qr4PrIXYA3coHn/6A31j gZeu8HZlLYbQ4kPntZtBtD6b5sadMawPH2TqyADvr+ue3G6sYa5pG+8+l5ACc2gxCL u7he0j1urbVzZSUSCA+Se1AD/MkYG3/aWXdnvx6tfVz/kovgYkL12PPHn3FvF4lBf1 EpZum8sFcoSZQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Jing Zhang , Sasha Levin Subject: Re: [PATCH 5.10.y 1/3] KVM: arm64: vgic-its: Add a data length check in vgic_its_save_* Date: Wed, 4 Dec 2024 17:11:40 -0500 Message-ID: <20241204163841-2bd7dff7f154841e@stable.kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241204202318.2716633-1-jingzhangos@google.com> References: Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit [ Sasha's backport helper bot ] Hi, The upstream commit SHA1 provided is correct: 7fe28d7e68f92cc3d0668b8f2fbdf5c303ac3022 Status in newer kernel trees: 6.12.y | Not found 6.11.y | Not found 6.6.y | Not found 6.1.y | Not found 5.15.y | Not found 5.10.y | Not found Note: The patch differs from the upstream commit: --- 1: 7fe28d7e68f92 ! 1: 1418fccba9c9e KVM: arm64: vgic-its: Add a data length check in vgic_its_save_* @@ Metadata ## Commit message ## KVM: arm64: vgic-its: Add a data length check in vgic_its_save_* + commit 7fe28d7e68f92cc3d0668b8f2fbdf5c303ac3022 upstream. + In all the vgic_its_save_*() functinos, they do not check whether the data length is 8 bytes before calling vgic_write_guest_lock. This patch adds the check. To prevent the kernel from being blown up @@ arch/arm64/kvm/vgic/vgic-its.c: static int vgic_its_save_ite(struct vgic_its *it ((u64)ite->irq->intid << KVM_ITS_ITE_PINTID_SHIFT) | ite->collection->collection_id; val = cpu_to_le64(val); -- return vgic_write_guest_lock(kvm, gpa, &val, ite_esz); +- return kvm_write_guest_lock(kvm, gpa, &val, ite_esz); + + return vgic_its_write_entry_lock(its, gpa, val, ite_esz); } @@ arch/arm64/kvm/vgic/vgic-its.c: static int vgic_its_save_dte(struct vgic_its *it (itt_addr_field << KVM_ITS_DTE_ITTADDR_SHIFT) | (dev->num_eventid_bits - 1)); val = cpu_to_le64(val); -- return vgic_write_guest_lock(kvm, ptr, &val, dte_esz); +- return kvm_write_guest_lock(kvm, ptr, &val, dte_esz); + + return vgic_its_write_entry_lock(its, ptr, val, dte_esz); } @@ arch/arm64/kvm/vgic/vgic-its.c: static int vgic_its_save_cte(struct vgic_its *it ((u64)collection->target_addr << KVM_ITS_CTE_RDBASE_SHIFT) | collection->collection_id); val = cpu_to_le64(val); -- return vgic_write_guest_lock(its->dev->kvm, gpa, &val, esz); +- return kvm_write_guest_lock(its->dev->kvm, gpa, &val, esz); + + return vgic_its_write_entry_lock(its, gpa, val, esz); } - /* + static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz) @@ arch/arm64/kvm/vgic/vgic-its.c: static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz) u64 val; int ret; @@ arch/arm64/kvm/vgic/vgic-its.c: static int vgic_its_save_collection_table(struct */ - val = 0; - BUG_ON(cte_esz > sizeof(val)); -- ret = vgic_write_guest_lock(its->dev->kvm, gpa, &val, cte_esz); +- ret = kvm_write_guest_lock(its->dev->kvm, gpa, &val, cte_esz); - return ret; + return vgic_its_write_entry_lock(its, gpa, 0, cte_esz); } - /* + /** ## arch/arm64/kvm/vgic/vgic.h ## -@@ arch/arm64/kvm/vgic/vgic.h: static inline int vgic_write_guest_lock(struct kvm *kvm, gpa_t gpa, - return ret; +@@ + #define __KVM_ARM_VGIC_NEW_H__ + + #include ++#include + + #define PRODUCT_ID_KVM 0x4b /* ASCII code K */ + #define IMPLEMENTER_ARM 0x43b +@@ arch/arm64/kvm/vgic/vgic.h: static inline bool vgic_irq_is_multi_sgi(struct vgic_irq *irq) + return vgic_irq_get_lr_count(irq) > 1; } +static inline int vgic_its_read_entry_lock(struct vgic_its *its, gpa_t eaddr, @@ arch/arm64/kvm/vgic/vgic.h: static inline int vgic_write_guest_lock(struct kvm * + if (KVM_BUG_ON(esize != sizeof(eval), kvm)) + return -EINVAL; + -+ return vgic_write_guest_lock(kvm, eaddr, &eval, esize); ++ return kvm_write_guest_lock(kvm, eaddr, &eval, esize); +} + /* --- Results of testing on various branches: | Branch | Patch Apply | Build Test | |---------------------------|-------------|------------| | stable/linux-5.10.y | Success | Success |