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nvmet: better data length validation

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Currently the NVMe target stores the expexted data length in req->data_len
and uses that for data transfer decisions, but that does not take the
actual transfer length in the SGLs into account.  So this adds a new
transfer_len field, into which the transport drivers store the actual
transfer length.  We then check the two match before actually executing
the command.

The FC transport driver already had such a field, which is removed in
favour of the common one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2017-11-09 14:29:58 +01:00 committed by Jens Axboe
parent 03e0f3a65e
commit 5e62d5c993
5 changed files with 34 additions and 25 deletions
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10
drivers/nvme/target/core.c
View File

@ -501,6 +501,7 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
req->ops = ops;
req->sg = NULL;
req->sg_cnt = 0;
req->transfer_len = 0;
req->rsp->status = 0;
/* no support for fused commands yet */
@ -550,6 +551,15 @@ void nvmet_req_uninit(struct nvmet_req *req)
}
EXPORT_SYMBOL_GPL(nvmet_req_uninit);
void nvmet_req_execute(struct nvmet_req *req)
{
if (unlikely(req->data_len != req->transfer_len))
nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
else
req->execute(req);
}
EXPORT_SYMBOL_GPL(nvmet_req_execute);
static inline bool nvmet_cc_en(u32 cc)
{
return (cc >> NVME_CC_EN_SHIFT) & 0x1;

32
drivers/nvme/target/fc.c
View File

@ -76,7 +76,6 @@ struct nvmet_fc_fcp_iod {
dma_addr_t rspdma;
struct scatterlist *data_sg;
int data_sg_cnt;
u32 total_length;
u32 offset;
enum nvmet_fcp_datadir io_dir;
bool active;
@ -1700,7 +1699,7 @@ nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
u32 page_len, length;
int i = 0;
length = fod->total_length;
length = fod->req.transfer_len;
nent = DIV_ROUND_UP(length, PAGE_SIZE);
sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
if (!sg)
@ -1789,7 +1788,7 @@ nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport,
u32 rsn, rspcnt, xfr_length;
if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP)
xfr_length = fod->total_length;
xfr_length = fod->req.transfer_len;
else
xfr_length = fod->offset;
@ -1815,7 +1814,7 @@ nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport,
rspcnt = atomic_inc_return(&fod->queue->zrspcnt);
if (!(rspcnt % fod->queue->ersp_ratio) ||
sqe->opcode == nvme_fabrics_command ||
xfr_length != fod->total_length ||
xfr_length != fod->req.transfer_len ||
(le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] ||
(sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) ||
queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head)))
@ -1892,7 +1891,7 @@ nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport,
fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC;
tlen = min_t(u32, tgtport->max_sg_cnt * PAGE_SIZE,
(fod->total_length - fod->offset));
(fod->req.transfer_len - fod->offset));
fcpreq->transfer_length = tlen;
fcpreq->transferred_length = 0;
fcpreq->fcp_error = 0;
@ -1906,7 +1905,7 @@ nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport,
* combined xfr with response.
*/
if ((op == NVMET_FCOP_READDATA) &&
((fod->offset + fcpreq->transfer_length) == fod->total_length) &&
((fod->offset + fcpreq->transfer_length) == fod->req.transfer_len) &&
(tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) {
fcpreq->op = NVMET_FCOP_READDATA_RSP;
nvmet_fc_prep_fcp_rsp(tgtport, fod);
@ -1986,7 +1985,7 @@ nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod)
}
fod->offset += fcpreq->transferred_length;
if (fod->offset != fod->total_length) {
if (fod->offset != fod->req.transfer_len) {
spin_lock_irqsave(&fod->flock, flags);
fod->writedataactive = true;
spin_unlock_irqrestore(&fod->flock, flags);
@ -1998,9 +1997,7 @@ nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod)
}
/* data transfer complete, resume with nvmet layer */
fod->req.execute(&fod->req);
nvmet_req_execute(&fod->req);
break;
case NVMET_FCOP_READDATA:
@ -2023,7 +2020,7 @@ nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod)
}
fod->offset += fcpreq->transferred_length;
if (fod->offset != fod->total_length) {
if (fod->offset != fod->req.transfer_len) {
/* transfer the next chunk */
nvmet_fc_transfer_fcp_data(tgtport, fod,
NVMET_FCOP_READDATA);
@ -2160,7 +2157,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done;
fod->total_length = be32_to_cpu(cmdiu->data_len);
fod->req.transfer_len = be32_to_cpu(cmdiu->data_len);
if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) {
fod->io_dir = NVMET_FCP_WRITE;
if (!nvme_is_write(&cmdiu->sqe))
@ -2171,7 +2168,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
goto transport_error;
} else {
fod->io_dir = NVMET_FCP_NODATA;
if (fod->total_length)
if (fod->req.transfer_len)
goto transport_error;
}
@ -2179,9 +2176,6 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
fod->req.rsp = &fod->rspiubuf.cqe;
fod->req.port = fod->queue->port;
/* ensure nvmet handlers will set cmd handler callback */
fod->req.execute = NULL;
/* clear any response payload */
memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf));
@ -2201,7 +2195,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
/* keep a running counter of tail position */
atomic_inc(&fod->queue->sqtail);
if (fod->total_length) {
if (fod->req.transfer_len) {
ret = nvmet_fc_alloc_tgt_pgs(fod);
if (ret) {
nvmet_req_complete(&fod->req, ret);
@ -2224,9 +2218,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
* can invoke the nvmet_layer now. If read data, cmd completion will
* push the data
*/
fod->req.execute(&fod->req);
nvmet_req_execute(&fod->req);
return;
transport_error:

3
drivers/nvme/target/loop.c
View File

@ -127,7 +127,7 @@ static void nvme_loop_execute_work(struct work_struct *work)
struct nvme_loop_iod *iod =
container_of(work, struct nvme_loop_iod, work);
iod->req.execute(&iod->req);
nvmet_req_execute(&iod->req);
}
static enum blk_eh_timer_return
@ -176,6 +176,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
iod->req.sg = iod->sg_table.sgl;
iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
iod->req.transfer_len = blk_rq_bytes(req);
}
blk_mq_start_request(req);

4
drivers/nvme/target/nvmet.h
View File

@ -223,7 +223,10 @@ struct nvmet_req {
struct bio inline_bio;
struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC];
int sg_cnt;
/* data length as parsed from the command: */
size_t data_len;
/* data length as parsed from the SGL descriptor: */
size_t transfer_len;
struct nvmet_port *port;
@ -266,6 +269,7 @@ u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req);
bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
struct nvmet_sq *sq, struct nvmet_fabrics_ops *ops);
void nvmet_req_uninit(struct nvmet_req *req);
void nvmet_req_execute(struct nvmet_req *req);
void nvmet_req_complete(struct nvmet_req *req, u16 status);
void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,

10
drivers/nvme/target/rdma.c
View File

@ -148,14 +148,14 @@ static inline u32 get_unaligned_le24(const u8 *p)
static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp)
{
return nvme_is_write(rsp->req.cmd) &&
rsp->req.data_len &&
rsp->req.transfer_len &&
!(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
}
static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp)
{
return !nvme_is_write(rsp->req.cmd) &&
rsp->req.data_len &&
rsp->req.transfer_len &&
!rsp->req.rsp->status &&
!(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
}
@ -577,7 +577,7 @@ static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
return;
}
rsp->req.execute(&rsp->req);
nvmet_req_execute(&rsp->req);
}
static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
@ -609,6 +609,7 @@ static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
nvmet_rdma_use_inline_sg(rsp, len, off);
rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
rsp->req.transfer_len += len;
return 0;
}
@ -636,6 +637,7 @@ static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
nvmet_data_dir(&rsp->req));
if (ret < 0)
return NVME_SC_INTERNAL;
rsp->req.transfer_len += len;
rsp->n_rdma += ret;
if (invalidate) {
@ -693,7 +695,7 @@ static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
queue->cm_id->port_num, &rsp->read_cqe, NULL))
nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
} else {
rsp->req.execute(&rsp->req);
nvmet_req_execute(&rsp->req);
}
return true;