forked from Minki/linux
2896c93811
When attempting to match EXTENDED COPY CSCD descriptors with corresponding
se_devices, target_xcopy_locate_se_dev_e4() currently iterates over LIO's
global devices list which includes all configured backstores.
This change ensures that only initiator-accessible backstores are
considered during CSCD descriptor lookup, according to the session's
se_node_acl LUN list.
To avoid LUN removal race conditions, device pinning is changed from being
configfs based to instead using the se_node_acl lun_ref.
Reference: CVE-2020-28374
Fixes: cbf031f425 ("target: Add support for EXTENDED_COPY copy offload emulation")
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <target/target_core_base.h>
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#define XCOPY_HDR_LEN 16
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#define XCOPY_TARGET_DESC_LEN 32
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#define XCOPY_SEGMENT_DESC_LEN 28
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#define XCOPY_NAA_IEEE_REGEX_LEN 16
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#define XCOPY_MAX_SECTORS 4096
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/*
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* SPC4r37 6.4.6.1
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* Table 150 — CSCD descriptor ID values
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*/
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#define XCOPY_CSCD_DESC_ID_LIST_OFF_MAX 0x07FF
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enum xcopy_origin_list {
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XCOL_SOURCE_RECV_OP = 0x01,
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XCOL_DEST_RECV_OP = 0x02,
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};
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struct xcopy_op {
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int op_origin;
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struct se_cmd *xop_se_cmd;
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struct se_device *src_dev;
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unsigned char src_tid_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
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struct se_device *dst_dev;
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unsigned char dst_tid_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
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unsigned char local_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
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struct percpu_ref *remote_lun_ref;
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sector_t src_lba;
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sector_t dst_lba;
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unsigned short stdi;
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unsigned short dtdi;
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unsigned short nolb;
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u32 xop_data_bytes;
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u32 xop_data_nents;
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struct scatterlist *xop_data_sg;
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struct work_struct xop_work;
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};
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/*
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* Receive Copy Results Sevice Actions
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*/
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#define RCR_SA_COPY_STATUS 0x00
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#define RCR_SA_RECEIVE_DATA 0x01
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#define RCR_SA_OPERATING_PARAMETERS 0x03
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#define RCR_SA_FAILED_SEGMENT_DETAILS 0x04
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/*
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* Receive Copy Results defs for Operating Parameters
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*/
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#define RCR_OP_MAX_TARGET_DESC_COUNT 0x2
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#define RCR_OP_MAX_SG_DESC_COUNT 0x1
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#define RCR_OP_MAX_DESC_LIST_LEN 1024
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#define RCR_OP_MAX_SEGMENT_LEN 268435456 /* 256 MB */
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#define RCR_OP_TOTAL_CONCURR_COPIES 0x1 /* Must be <= 16384 */
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#define RCR_OP_MAX_CONCURR_COPIES 0x1 /* Must be <= 255 */
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#define RCR_OP_DATA_SEG_GRAN_LOG2 9 /* 512 bytes in log 2 */
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#define RCR_OP_INLINE_DATA_GRAN_LOG2 9 /* 512 bytes in log 2 */
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#define RCR_OP_HELD_DATA_GRAN_LOG2 9 /* 512 bytes in log 2 */
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extern int target_xcopy_setup_pt(void);
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extern void target_xcopy_release_pt(void);
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extern sense_reason_t target_do_xcopy(struct se_cmd *);
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extern sense_reason_t target_do_receive_copy_results(struct se_cmd *);
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