| Message ID | 20181119210636.22979-2-ddiss@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | target: user configurable T10 Vendor ID | expand |
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
On Mon, 2018-11-19 at 22:06 +0100, David Disseldorp wrote: > diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c > index f459118bc11b..c37dd36ec77d 100644 > --- a/drivers/target/target_core_spc.c > +++ b/drivers/target/target_core_spc.c > @@ -108,12 +108,17 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) > > buf[7] = 0x2; /* CmdQue=1 */ > > - memcpy(&buf[8], "LIO-ORG ", 8); > - memset(&buf[16], 0x20, 16); > + /* > + * ASCII data fields described as being left-aligned shall have any > + * unused bytes at the end of the field (i.e., highest offset) and the > + * unused bytes shall be filled with ASCII space characters (20h). > + */ > + memset(&buf[8], 0x20, 8 + 16 + 4); > + memcpy(&buf[8], "LIO-ORG", sizeof("LIO-ORG") - 1); > memcpy(&buf[16], dev->t10_wwn.model, > - min_t(size_t, strlen(dev->t10_wwn.model), 16)); > + strnlen(dev->t10_wwn.model, 16)); > memcpy(&buf[32], dev->t10_wwn.revision, > - min_t(size_t, strlen(dev->t10_wwn.revision), 4)); > + strnlen(dev->t10_wwn.revision, 4)); > buf[4] = 31; /* Set additional length to 31 */ > > return 0; > @@ -251,7 +256,9 @@ spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) > buf[off] = 0x2; /* ASCII */ > buf[off+1] = 0x1; /* T10 Vendor ID */ > buf[off+2] = 0x0; > - memcpy(&buf[off+4], "LIO-ORG", 8); > + /* left align Vendor ID and pad with spaces */ > + memset(&buf[off+4], 0x20, 8); > + memcpy(&buf[off+4], "LIO-ORG", sizeof("LIO-ORG") - 1); > /* Extra Byte for NULL Terminator */ > id_len++; > /* Identifier Length */ A helper function that accepts a '\0'-terminated string and a field length as input and that copies the input string and pads it with spaces would be welcome. From the SCST source code: /* * 8 byte ASCII Vendor Identification of the target * - left aligned. */ scst_copy_and_fill(&buf[8], virt_dev->t10_vend_id, 8); /* * 16 byte ASCII Product Identification of the target - left * aligned. */ scst_copy_and_fill(&buf[16], virt_dev->prod_id, 16); /* * 4 byte ASCII Product Revision Level of the target - left * aligned. */ scst_copy_and_fill(&buf[32], virt_dev->prod_rev_lvl, 4); /* * Copy a zero-terminated string into a fixed-size byte array and fill the * trailing bytes with @fill_byte. */ static void scst_copy_and_fill_b(char *dst, const char *src, int len, uint8_t fill_byte) { int cpy_len = min_t(int, strlen(src), len); memcpy(dst, src, cpy_len); memset(dst + cpy_len, fill_byte, len - cpy_len); } /* * Copy a zero-terminated string into a fixed-size char array and fill the * trailing characters with spaces. */ static void scst_copy_and_fill(char *dst, const char *src, int len) { scst_copy_and_fill_b(dst, src, len, ' '); } Bart.
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c index f459118bc11b..c37dd36ec77d 100644 --- a/drivers/target/target_core_spc.c +++ b/drivers/target/target_core_spc.c @@ -108,12 +108,17 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) buf[7] = 0x2; /* CmdQue=1 */ - memcpy(&buf[8], "LIO-ORG ", 8); - memset(&buf[16], 0x20, 16); + /* + * ASCII data fields described as being left-aligned shall have any + * unused bytes at the end of the field (i.e., highest offset) and the + * unused bytes shall be filled with ASCII space characters (20h). + */ + memset(&buf[8], 0x20, 8 + 16 + 4); + memcpy(&buf[8], "LIO-ORG", sizeof("LIO-ORG") - 1); memcpy(&buf[16], dev->t10_wwn.model, - min_t(size_t, strlen(dev->t10_wwn.model), 16)); + strnlen(dev->t10_wwn.model, 16)); memcpy(&buf[32], dev->t10_wwn.revision, - min_t(size_t, strlen(dev->t10_wwn.revision), 4)); + strnlen(dev->t10_wwn.revision, 4)); buf[4] = 31; /* Set additional length to 31 */ return 0; @@ -251,7 +256,9 @@ spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) buf[off] = 0x2; /* ASCII */ buf[off+1] = 0x1; /* T10 Vendor ID */ buf[off+2] = 0x0; - memcpy(&buf[off+4], "LIO-ORG", 8); + /* left align Vendor ID and pad with spaces */ + memset(&buf[off+4], 0x20, 8); + memcpy(&buf[off+4], "LIO-ORG", sizeof("LIO-ORG") - 1); /* Extra Byte for NULL Terminator */ id_len++; /* Identifier Length */
spc5r17.pdf specifies: 4.3.1 ASCII data field requirements ASCII data fields shall contain only ASCII printable characters (i.e., code values 20h to 7Eh) and may be terminated with one or more ASCII null (00h) characters. ASCII data fields described as being left-aligned shall have any unused bytes at the end of the field (i.e., highest offset) and the unused bytes shall be filled with ASCII space characters (20h). LIO currently space-pads the T10 VENDOR IDENTIFICATION and PRODUCT IDENTIFICATION fields in the standard INQUIRY data. However, the PRODUCT REVISION LEVEL field in the standard INQUIRY data as well as the T10 VENDOR IDENTIFICATION field in the INQUIRY Device Identification VPD Page are zero-terminated/zero-padded. Fix this inconsistency by using space-padding for all of the above fields. Signed-off-by: David Disseldorp <ddiss@suse.de> --- drivers/target/target_core_spc.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-)