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[94.112.167.15]) by smtp.gmail.com with ESMTPSA id f23-20020a05640214d700b005224ec27dd7sm1200778edx.66.2023.07.25.14.29.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Jul 2023 14:29:11 -0700 (PDT) From: Ilya Dryomov To: ceph-devel@vger.kernel.org Cc: Dongsheng Yang Subject: [PATCH v2 2/3] rbd: harden get_lock_owner_info() a bit Date: Tue, 25 Jul 2023 23:28:45 +0200 Message-ID: <20230725212847.137672-3-idryomov@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230725212847.137672-1-idryomov@gmail.com> References: <20230725212847.137672-1-idryomov@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org - we want the exclusive lock type, so test for it directly - use sscanf() to actually parse the lock cookie and avoid admitting invalid handles - bail if locker has a blank address Signed-off-by: Ilya Dryomov --- drivers/block/rbd.c | 21 +++++++++++++++------ net/ceph/messenger.c | 1 + 2 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index dca6c1e5f6bc..94629e826369 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3862,10 +3862,9 @@ static struct ceph_locker *get_lock_owner_info(struct rbd_device *rbd_dev) u32 num_lockers; u8 lock_type; char *lock_tag; + u64 handle; int ret; - dout("%s rbd_dev %p\n", __func__, rbd_dev); - ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, RBD_LOCK_NAME, &lock_type, &lock_tag, &lockers, &num_lockers); @@ -3886,18 +3885,28 @@ static struct ceph_locker *get_lock_owner_info(struct rbd_device *rbd_dev) goto err_busy; } - if (lock_type == CEPH_CLS_LOCK_SHARED) { - rbd_warn(rbd_dev, "shared lock type detected"); + if (lock_type != CEPH_CLS_LOCK_EXCLUSIVE) { + rbd_warn(rbd_dev, "incompatible lock type detected"); goto err_busy; } WARN_ON(num_lockers != 1); - if (strncmp(lockers[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, - strlen(RBD_LOCK_COOKIE_PREFIX))) { + ret = sscanf(lockers[0].id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", + &handle); + if (ret != 1) { rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", lockers[0].id.cookie); goto err_busy; } + if (ceph_addr_is_blank(&lockers[0].info.addr)) { + rbd_warn(rbd_dev, "locker has a blank address"); + goto err_busy; + } + + dout("%s rbd_dev %p got locker %s%llu@%pISpc/%u handle %llu\n", + __func__, rbd_dev, ENTITY_NAME(lockers[0].id.name), + &lockers[0].info.addr.in_addr, + le32_to_cpu(lockers[0].info.addr.nonce), handle); out: kfree(lock_tag); diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index cd7b0bf5369e..5eb4898cccd4 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -1123,6 +1123,7 @@ bool ceph_addr_is_blank(const struct ceph_entity_addr *addr) return true; } } +EXPORT_SYMBOL(ceph_addr_is_blank); int ceph_addr_port(const struct ceph_entity_addr *addr) {