From a1ccfd6f6e06eceb632cc29c4f15a32860f05a7e Mon Sep 17 00:00:00 2001 From: Ricardo Koller Date: Mon, 9 May 2022 17:16:32 -0700 Subject: KVM: arm64: vgic: Do not ignore vgic_its_restore_cte failures Restoring a corrupted collection entry (like an out of range ID) is being ignored and treated as success. More specifically, a vgic_its_restore_cte failure is treated as success by vgic_its_restore_collection_table. vgic_its_restore_cte uses positive and negative numbers to return error, and +1 to return success. The caller then uses "ret > 0" to check for success. Fix this by having vgic_its_restore_cte only return negative numbers on error. Do this by changing alloc_collection return codes to only return negative numbers on error. Signed-off-by: Ricardo Koller Reviewed-by: Oliver Upton Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220510001633.552496-4-ricarkol@google.com --- arch/arm64/kvm/vgic/vgic-its.c | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c index 8a7db839e3bf..f34e09cc86dc 100644 --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -999,15 +999,16 @@ static bool vgic_its_check_event_id(struct vgic_its *its, struct its_device *dev return __is_visible_gfn_locked(its, gpa); } +/* + * Add a new collection into the ITS collection table. + * Returns 0 on success, and a negative error value for generic errors. + */ static int vgic_its_alloc_collection(struct vgic_its *its, struct its_collection **colp, u32 coll_id) { struct its_collection *collection; - if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL)) - return E_ITS_MAPC_COLLECTION_OOR; - collection = kzalloc(sizeof(*collection), GFP_KERNEL_ACCOUNT); if (!collection) return -ENOMEM; @@ -1101,7 +1102,12 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its, collection = find_collection(its, coll_id); if (!collection) { - int ret = vgic_its_alloc_collection(its, &collection, coll_id); + int ret; + + if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL)) + return E_ITS_MAPC_COLLECTION_OOR; + + ret = vgic_its_alloc_collection(its, &collection, coll_id); if (ret) return ret; new_coll = collection; @@ -1256,6 +1262,10 @@ static int vgic_its_cmd_handle_mapc(struct kvm *kvm, struct vgic_its *its, if (!collection) { int ret; + if (!vgic_its_check_id(its, its->baser_coll_table, + coll_id, NULL)) + return E_ITS_MAPC_COLLECTION_OOR; + ret = vgic_its_alloc_collection(its, &collection, coll_id); if (ret) @@ -2491,6 +2501,11 @@ static int vgic_its_save_cte(struct vgic_its *its, return kvm_write_guest_lock(its->dev->kvm, gpa, &val, esz); } +/* + * Restore a collection entry into the ITS collection table. + * Return +1 on success, 0 if the entry was invalid (which should be + * interpreted as end-of-table), and a negative error value for generic errors. + */ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz) { struct its_collection *collection; @@ -2517,6 +2532,10 @@ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz) collection = find_collection(its, coll_id); if (collection) return -EEXIST; + + if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL)) + return -EINVAL; + ret = vgic_its_alloc_collection(its, &collection, coll_id); if (ret) return ret; -- cgit v1.2.3