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Commit afff0d23 authored by James Smart's avatar James Smart Committed by Martin K. Petersen
Browse files

scsi: lpfc: Add Buffer overflow check, when nvme_info larger than PAGE_SIZE 



Kernel crashes during fill_read_buffer when nvme_info sysfs file read.

With multiple NVME targets, approx 40, nvme_info may grow larger than
PAGE_SIZE bytes.  snprintf(buf + len, PAGE_SIZE - len, ...) logic is flawed
as PAGE_SIZE - len can be < 0 and is accepted by snprintf.  This results in
buffer overflow, and is detected with check from dev_attr_show and
fill_read_buffer.

Change to use scnprintf to a tmp array, before calling strlcat to ensure no
buffer overflow over PAGE_SIZE bytes.

Message "6314" created as a new message indicating when there is more nvme
info, but is truncated to fit within PAGE_SIZE bytes.

Signed-off-by: default avatarDick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: default avatarJames Smart <james.smart@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent e936a38a

drivers/scsi/lpfc/lpfc_attr.c

+257 −175
Original line number Diff line number Diff line
@@ -64,6 +64,9 @@ 
#define LPFC_MIN_MRQ_POST	512

#define LPFC_MAX_MRQ_POST	2048



#define LPFC_MAX_NVME_INFO_TMP_LEN	100

#define LPFC_NVME_INFO_MORE_STR		"\nCould be more info...\n"



/*

 * Write key size should be multiple of 4. If write key is changed

 * make sure that library write key is also changed.
@@ -158,14 +161,15 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, 
	char *statep;

	int i;

	int len = 0;

	char tmp[LPFC_MAX_NVME_INFO_TMP_LEN] = {0};



	if (!(phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME)) {

		len += snprintf(buf, PAGE_SIZE, "NVME Disabled\n");

		len = scnprintf(buf, PAGE_SIZE, "NVME Disabled\n");

		return len;

	}

	if (phba->nvmet_support) {

		if (!phba->targetport) {

			len = snprintf(buf, PAGE_SIZE,

			len = scnprintf(buf, PAGE_SIZE,

					"NVME Target: x%llx is not allocated\n",

					wwn_to_u64(vport->fc_portname.u.wwn));

			return len;
@@ -175,62 +179,82 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, 
			statep = "REGISTERED";

		else

			statep = "INIT";

		len += snprintf(buf + len, PAGE_SIZE - len,

		scnprintf(tmp, sizeof(tmp),

			  "NVME Target Enabled  State %s\n",

			  statep);

		len += snprintf(buf + len, PAGE_SIZE - len,

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		scnprintf(tmp, sizeof(tmp),

			  "%s%d WWPN x%llx WWNN x%llx DID x%06x\n",

			  "NVME Target: lpfc",

			  phba->brd_no,

			  wwn_to_u64(vport->fc_portname.u.wwn),

			  wwn_to_u64(vport->fc_nodename.u.wwn),

			  phba->targetport->port_id);

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		if (strlcat(buf, "\nNVME Target: Statistics\n", PAGE_SIZE)

		    >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf + len, PAGE_SIZE - len,

				"\nNVME Target: Statistics\n");

		tgtp = (struct lpfc_nvmet_tgtport *)phba->targetport->private;

		len += snprintf(buf+len, PAGE_SIZE-len,

		scnprintf(tmp, sizeof(tmp),

			  "LS: Rcv %08x Drop %08x Abort %08x\n",

			  atomic_read(&tgtp->rcv_ls_req_in),

			  atomic_read(&tgtp->rcv_ls_req_drop),

			  atomic_read(&tgtp->xmt_ls_abort));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		if (atomic_read(&tgtp->rcv_ls_req_in) !=

		    atomic_read(&tgtp->rcv_ls_req_out)) {

			len += snprintf(buf+len, PAGE_SIZE-len,

			scnprintf(tmp, sizeof(tmp),

				  "Rcv LS: in %08x != out %08x\n",

				  atomic_read(&tgtp->rcv_ls_req_in),

				  atomic_read(&tgtp->rcv_ls_req_out));

			if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

				goto buffer_done;

		}



		len += snprintf(buf+len, PAGE_SIZE-len,

		scnprintf(tmp, sizeof(tmp),

			  "LS: Xmt %08x Drop %08x Cmpl %08x\n",

			  atomic_read(&tgtp->xmt_ls_rsp),

			  atomic_read(&tgtp->xmt_ls_drop),

			  atomic_read(&tgtp->xmt_ls_rsp_cmpl));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf + len, PAGE_SIZE - len,

		scnprintf(tmp, sizeof(tmp),

			  "LS: RSP Abort %08x xb %08x Err %08x\n",

			  atomic_read(&tgtp->xmt_ls_rsp_aborted),

			  atomic_read(&tgtp->xmt_ls_rsp_xb_set),

			  atomic_read(&tgtp->xmt_ls_rsp_error));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf+len, PAGE_SIZE-len,

		scnprintf(tmp, sizeof(tmp),

			  "FCP: Rcv %08x Defer %08x Release %08x "

			  "Drop %08x\n",

			  atomic_read(&tgtp->rcv_fcp_cmd_in),

			  atomic_read(&tgtp->rcv_fcp_cmd_defer),

			  atomic_read(&tgtp->xmt_fcp_release),

			  atomic_read(&tgtp->rcv_fcp_cmd_drop));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		if (atomic_read(&tgtp->rcv_fcp_cmd_in) !=

		    atomic_read(&tgtp->rcv_fcp_cmd_out)) {

			len += snprintf(buf+len, PAGE_SIZE-len,

			scnprintf(tmp, sizeof(tmp),

				  "Rcv FCP: in %08x != out %08x\n",

				  atomic_read(&tgtp->rcv_fcp_cmd_in),

				  atomic_read(&tgtp->rcv_fcp_cmd_out));

			if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

				goto buffer_done;

		}



		len += snprintf(buf+len, PAGE_SIZE-len,

		scnprintf(tmp, sizeof(tmp),

			  "FCP Rsp: RD %08x rsp %08x WR %08x rsp %08x "

			  "drop %08x\n",

			  atomic_read(&tgtp->xmt_fcp_read),
@@ -238,72 +262,86 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, 
			  atomic_read(&tgtp->xmt_fcp_write),

			  atomic_read(&tgtp->xmt_fcp_rsp),

			  atomic_read(&tgtp->xmt_fcp_drop));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf+len, PAGE_SIZE-len,

		scnprintf(tmp, sizeof(tmp),

			  "FCP Rsp Cmpl: %08x err %08x drop %08x\n",

			  atomic_read(&tgtp->xmt_fcp_rsp_cmpl),

			  atomic_read(&tgtp->xmt_fcp_rsp_error),

			  atomic_read(&tgtp->xmt_fcp_rsp_drop));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf+len, PAGE_SIZE-len,

		scnprintf(tmp, sizeof(tmp),

			  "FCP Rsp Abort: %08x xb %08x xricqe  %08x\n",

			  atomic_read(&tgtp->xmt_fcp_rsp_aborted),

			  atomic_read(&tgtp->xmt_fcp_rsp_xb_set),

			  atomic_read(&tgtp->xmt_fcp_xri_abort_cqe));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf + len, PAGE_SIZE - len,

		scnprintf(tmp, sizeof(tmp),

			  "ABORT: Xmt %08x Cmpl %08x\n",

			  atomic_read(&tgtp->xmt_fcp_abort),

			  atomic_read(&tgtp->xmt_fcp_abort_cmpl));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf + len, PAGE_SIZE - len,

				"ABORT: Sol %08x  Usol %08x Err %08x Cmpl %08x",

		scnprintf(tmp, sizeof(tmp),

			  "ABORT: Sol %08x  Usol %08x Err %08x Cmpl %08x\n",

			  atomic_read(&tgtp->xmt_abort_sol),

			  atomic_read(&tgtp->xmt_abort_unsol),

			  atomic_read(&tgtp->xmt_abort_rsp),

			  atomic_read(&tgtp->xmt_abort_rsp_error));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		len += snprintf(buf + len, PAGE_SIZE - len,

		scnprintf(tmp, sizeof(tmp),

			  "DELAY: ctx %08x  fod %08x wqfull %08x\n",

			  atomic_read(&tgtp->defer_ctx),

			  atomic_read(&tgtp->defer_fod),

			  atomic_read(&tgtp->defer_wqfull));

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		/* Calculate outstanding IOs */

		tot = atomic_read(&tgtp->rcv_fcp_cmd_drop);

		tot += atomic_read(&tgtp->xmt_fcp_release);

		tot = atomic_read(&tgtp->rcv_fcp_cmd_in) - tot;



		len += snprintf(buf + len, PAGE_SIZE - len,

		scnprintf(tmp, sizeof(tmp),

			  "IO_CTX: %08x  WAIT: cur %08x tot %08x\n"

				"CTX Outstanding %08llx\n",

			  "CTX Outstanding %08llx\n\n",

			  phba->sli4_hba.nvmet_xri_cnt,

			  phba->sli4_hba.nvmet_io_wait_cnt,

			  phba->sli4_hba.nvmet_io_wait_total,

			  tot);



		len +=  snprintf(buf+len, PAGE_SIZE-len, "\n");

		return len;

		strlcat(buf, tmp, PAGE_SIZE);

		goto buffer_done;

	}



	localport = vport->localport;

	if (!localport) {

		len = snprintf(buf, PAGE_SIZE,

		len = scnprintf(buf, PAGE_SIZE,

				"NVME Initiator x%llx is not allocated\n",

				wwn_to_u64(vport->fc_portname.u.wwn));

		return len;

	}

	lport = (struct lpfc_nvme_lport *)localport->private;

	len = snprintf(buf, PAGE_SIZE, "NVME Initiator Enabled\n");

	if (strlcat(buf, "\nNVME Initiator Enabled\n", PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	spin_lock_irq(shost->host_lock);

	len += snprintf(buf + len, PAGE_SIZE - len,

	rcu_read_lock();

	scnprintf(tmp, sizeof(tmp),

		  "XRI Dist lpfc%d Total %d NVME %d SCSI %d ELS %d\n",

		  phba->brd_no,

		  phba->sli4_hba.max_cfg_param.max_xri,

		  phba->sli4_hba.nvme_xri_max,

		  phba->sli4_hba.scsi_xri_max,

		  lpfc_sli4_get_els_iocb_cnt(phba));

	if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	/* Port state is only one of two values for now. */

	if (localport->port_id)
@@ -311,13 +349,15 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, 
	else

		statep = "UNKNOWN ";



	len += snprintf(buf + len, PAGE_SIZE - len,

	scnprintf(tmp, sizeof(tmp),

		  "%s%d WWPN x%llx WWNN x%llx DID x%06x %s\n",

		  "NVME LPORT lpfc",

		  phba->brd_no,

		  wwn_to_u64(vport->fc_portname.u.wwn),

		  wwn_to_u64(vport->fc_nodename.u.wwn),

		  localport->port_id, statep);

	if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {

		rport = lpfc_ndlp_get_nrport(ndlp);
@@ -343,56 +383,77 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, 
		}



		/* Tab in to show lport ownership. */

		len += snprintf(buf + len, PAGE_SIZE - len,

				"NVME RPORT       ");

		if (phba->brd_no >= 10)

			len += snprintf(buf + len, PAGE_SIZE - len, " ");

		if (strlcat(buf, "NVME RPORT       ", PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;

		if (phba->brd_no >= 10) {

			if (strlcat(buf, " ", PAGE_SIZE) >= PAGE_SIZE)

				goto buffer_done;

		}



		len += snprintf(buf + len, PAGE_SIZE - len, "WWPN x%llx ",

		scnprintf(tmp, sizeof(tmp), "WWPN x%llx ",

			  nrport->port_name);

		len += snprintf(buf + len, PAGE_SIZE - len, "WWNN x%llx ",

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		scnprintf(tmp, sizeof(tmp), "WWNN x%llx ",

			  nrport->node_name);

		len += snprintf(buf + len, PAGE_SIZE - len, "DID x%06x ",

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		scnprintf(tmp, sizeof(tmp), "DID x%06x ",

			  nrport->port_id);

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;



		/* An NVME rport can have multiple roles. */

		if (nrport->port_role & FC_PORT_ROLE_NVME_INITIATOR)

			len +=  snprintf(buf + len, PAGE_SIZE - len,

					 "INITIATOR ");

		if (nrport->port_role & FC_PORT_ROLE_NVME_TARGET)

			len +=  snprintf(buf + len, PAGE_SIZE - len,

					 "TARGET ");

		if (nrport->port_role & FC_PORT_ROLE_NVME_DISCOVERY)

			len +=  snprintf(buf + len, PAGE_SIZE - len,

					 "DISCSRVC ");

		if (nrport->port_role & FC_PORT_ROLE_NVME_INITIATOR) {

			if (strlcat(buf, "INITIATOR ", PAGE_SIZE) >= PAGE_SIZE)

				goto buffer_done;

		}

		if (nrport->port_role & FC_PORT_ROLE_NVME_TARGET) {

			if (strlcat(buf, "TARGET ", PAGE_SIZE) >= PAGE_SIZE)

				goto buffer_done;

		}

		if (nrport->port_role & FC_PORT_ROLE_NVME_DISCOVERY) {

			if (strlcat(buf, "DISCSRVC ", PAGE_SIZE) >= PAGE_SIZE)

				goto buffer_done;

		}

		if (nrport->port_role & ~(FC_PORT_ROLE_NVME_INITIATOR |

					  FC_PORT_ROLE_NVME_TARGET |

					  FC_PORT_ROLE_NVME_DISCOVERY))

			len +=  snprintf(buf + len, PAGE_SIZE - len,

					 "UNKNOWN ROLE x%x",

					  FC_PORT_ROLE_NVME_DISCOVERY)) {

			scnprintf(tmp, sizeof(tmp), "UNKNOWN ROLE x%x",

				  nrport->port_role);

			if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

				goto buffer_done;

		}



		len +=  snprintf(buf + len, PAGE_SIZE - len, "%s  ", statep);

		/* Terminate the string. */

		len +=  snprintf(buf + len, PAGE_SIZE - len, "\n");

		scnprintf(tmp, sizeof(tmp), "%s\n", statep);

		if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

			goto buffer_done;

	}

	spin_unlock_irq(shost->host_lock);

	rcu_read_unlock();



	if (!lport)

		return len;

		goto buffer_done;



	len += snprintf(buf + len, PAGE_SIZE - len, "\nNVME Statistics\n");

	len += snprintf(buf+len, PAGE_SIZE-len,

	if (strlcat(buf, "\nNVME Statistics\n", PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	scnprintf(tmp, sizeof(tmp),

		  "LS: Xmt %010x Cmpl %010x Abort %08x\n",

		  atomic_read(&lport->fc4NvmeLsRequests),

		  atomic_read(&lport->fc4NvmeLsCmpls),

		  atomic_read(&lport->xmt_ls_abort));

	if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	len += snprintf(buf + len, PAGE_SIZE - len,

	scnprintf(tmp, sizeof(tmp),

		  "LS XMIT: Err %08x  CMPL: xb %08x Err %08x\n",

		  atomic_read(&lport->xmt_ls_err),

		  atomic_read(&lport->cmpl_ls_xb),

		  atomic_read(&lport->cmpl_ls_err));

	if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	totin = 0;

	totout = 0;
@@ -405,13 +466,15 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, 
		data3 = atomic_read(&cstat->fc4NvmeControlRequests);

		totout += (data1 + data2 + data3);

	}

	len += snprintf(buf+len, PAGE_SIZE-len,

	scnprintf(tmp, sizeof(tmp),

		  "Total FCP Cmpl %016llx Issue %016llx "

		  "OutIO %016llx\n",

		  totin, totout, totout - totin);

	if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	len += snprintf(buf+len, PAGE_SIZE-len,

			"      abort %08x noxri %08x nondlp %08x qdepth %08x "

	scnprintf(tmp, sizeof(tmp),

		  "\tabort %08x noxri %08x nondlp %08x qdepth %08x "

		  "wqerr %08x err %08x\n",

		  atomic_read(&lport->xmt_fcp_abort),

		  atomic_read(&lport->xmt_fcp_noxri),
@@ -419,11 +482,30 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr, 
		  atomic_read(&lport->xmt_fcp_qdepth),

		  atomic_read(&lport->xmt_fcp_err),

		  atomic_read(&lport->xmt_fcp_wqerr));

	if (strlcat(buf, tmp, PAGE_SIZE) >= PAGE_SIZE)

		goto buffer_done;



	len += snprintf(buf + len, PAGE_SIZE - len,

	scnprintf(tmp, sizeof(tmp),

		  "FCP CMPL: xb %08x Err %08x\n",

		  atomic_read(&lport->cmpl_fcp_xb),

		  atomic_read(&lport->cmpl_fcp_err));

	strlcat(buf, tmp, PAGE_SIZE);



buffer_done:

	len = strnlen(buf, PAGE_SIZE);



	if (unlikely(len >= (PAGE_SIZE - 1))) {

		lpfc_printf_log(phba, KERN_INFO, LOG_NVME,

				"6314 Catching potential buffer "

				"overflow > PAGE_SIZE = %lu bytes\n",

				PAGE_SIZE);

		strlcpy(buf + PAGE_SIZE - 1 -

			strnlen(LPFC_NVME_INFO_MORE_STR, PAGE_SIZE - 1),

			LPFC_NVME_INFO_MORE_STR,

			strnlen(LPFC_NVME_INFO_MORE_STR, PAGE_SIZE - 1)

			+ 1);

	}



	return len;

}