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target: check XCOPY segment descriptor CSCD IDs 

Ensure that the segment descriptor CSCD descriptor ID values correspond
to CSCD descriptor entries located in the XCOPY command parameter list.
SPC4r37 6.4.6.1 Table 150 specifies this range as 0000h to 07FFh, where
the CSCD descriptor location in the parameter list can be located via:
16 + (id * 32)

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
[ bvanassche: inserted "; " in the format string of an error message
  and also moved a "||" operator from the start of a line to the end
  of the previous line ]
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
This commit is contained in:
David Disseldorp 2017-01-02 18:04:06 +01:00 committed by Bart Van Assche
parent 94aae4caac
commit f184210bca
2 changed files with 14 additions and 0 deletions
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8
drivers/target/target_core_xcopy.c
View File

@ -278,6 +278,14 @@ static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op
xop->stdi = get_unaligned_be16(&desc[4]);
xop->dtdi = get_unaligned_be16(&desc[6]);
if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
return -EINVAL;
}
pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
desc_len, xop->stdi, xop->dtdi, dc);

6
drivers/target/target_core_xcopy.h
View File

@ -5,6 +5,12 @@
#define XCOPY_NAA_IEEE_REGEX_LEN 16
#define XCOPY_MAX_SECTORS 1024
/*
* SPC4r37 6.4.6.1
* Table 150 — CSCD descriptor ID values
*/
#define XCOPY_CSCD_DESC_ID_LIST_OFF_MAX 0x07FF
enum xcopy_origin_list {
XCOL_SOURCE_RECV_OP = 0x01,
XCOL_DEST_RECV_OP = 0x02,