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Fri, 03 Jul 2026 11:02:43 +0000 From: =?UTF-8?q?Carlos=20L=C3=B3pez?= To: kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Cc: maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, =?UTF-8?q?Carlos=20L=C3=B3pez?= Subject: [PATCH v3 0/2] KVM: arm64: vgic: Fix racy LPI release and re-registration handling Date: Fri, 3 Jul 2026 13:01:28 +0200 Message-ID: <20260703110130.2609872-2-clopez@suse.de> X-Mailer: git-send-email 2.51.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Action: no action X-Spamd-Result: default: False [-3.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Fix a couple of potential issues that could arise from racy LPI release and re-registration for the same INTID. The issue fixed in patch 1 can manifest itself through either a leaked LPI structure, or a prematurely deleted LPI. The issue fixed in patch 2 could materialize as a spurious -ENOMEM failure when registering an LPI. v3: * Use refcount_dec_and_lock_irqsave() instead of unconditionally grabbing the xarray lock in patch 1. * Add patch 2. v2: * Address Sashiko's review. Fix the direct release path by decrementing the refcount under the xarray spinlock, preventing a UAF that would have been introduced in v1. Carlos López (2): KVM: arm64: vgic: Fix race between LPI release and re-registration KVM: arm64: vgic: Mitigate potential LPI registration failure arch/arm64/kvm/vgic/vgic-its.c | 10 +++++++++- arch/arm64/kvm/vgic/vgic.c | 10 ++++++---- 2 files changed, 15 insertions(+), 5 deletions(-) base-commit: 1ee27dacbe5dc4def481794d899d67b0d4570094 -- 2.51.0