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scst: Limit the size of READ CAPACITY buffers

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Fixes: be8b679bb8 ("scst: fix tapes handling with Windows initiators")
Reported-by: James McCarthy <mccarthy1029@gmail.com>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@9336 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2021-01-17 20:31:31 +00:00
parent ed0bb63c54
commit dd467b0eda
2 changed files with 18 additions and 1 deletions
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2
scst/include/scst.h
View File

@@ -2342,6 +2342,8 @@ struct scst_cmd {
uint8_t lba_len; /* LBA length in cdb */
uint8_t len_off; /* length offset in cdb */
uint8_t len_len; /* length length in cdb */
/* If not zero, logarithm base 2 of the maximum data buffer length. */
uint8_t log2_max_buf_len;
uint32_t op_flags; /* various flags of this opcode */
const char *op_name; /* op code SCSI full name */

17
scst/src/scst_lib.c
View File

@@ -550,6 +550,8 @@ struct scst_sdbops {
* target <--> init: SCST_DATA_READ|
* SCST_DATA_WRITE
*/
/* If not zero, logarithm base 2 of the maximum data buffer length. */
uint8_t log2_max_buf_len;
uint32_t info_op_flags; /* various flags of this opcode */
const char *info_op_name;/* op code SCSI full name */
int (*get_cdb_info)(struct scst_cmd *cmd, const struct scst_sdbops *sdbops);
@@ -876,6 +878,7 @@ static const struct scst_sdbops scst_scsi_op_table[] = {
.info_data_direction = SCST_DATA_READ,
.info_op_flags = SCST_IMPLICIT_HQ|SCST_REG_RESERVE_ALLOWED|
SCST_WRITE_EXCL_ALLOWED|SCST_EXCL_ACCESS_ALLOWED,
.log2_max_buf_len = 3,
.get_cdb_info = get_cdb_info_read_capacity},
{.ops = 0x25, .devkey = " O ",
.info_op_name = "GET WINDOW",
@@ -11213,6 +11216,7 @@ static int get_cdb_info_serv_act_in(struct scst_cmd *cmd,
SCST_REG_RESERVE_ALLOWED |
SCST_WRITE_EXCL_ALLOWED |
SCST_EXCL_ACCESS_ALLOWED;
cmd->log2_max_buf_len = 5;
break;
case SAI_GET_LBA_STATUS:
cmd->op_name = "GET LBA STATUS";
@@ -11818,6 +11822,8 @@ static int get_cdb_info_dyn_runtime_attr(struct scst_cmd *cmd,
static int scst_set_cmd_from_cdb_info(struct scst_cmd *cmd,
const struct scst_sdbops *ptr)
{
int res;
cmd->cdb_len = SCST_GET_CDB_LEN(cmd->cdb[0]);
cmd->cmd_naca = (cmd->cdb[cmd->cdb_len - 1] & CONTROL_BYTE_NACA_BIT);
cmd->cmd_linked = (cmd->cdb[cmd->cdb_len - 1] & CONTROL_BYTE_LINK_BIT);
@@ -11828,7 +11834,16 @@ static int scst_set_cmd_from_cdb_info(struct scst_cmd *cmd,
cmd->lba_len = ptr->info_lba_len;
cmd->len_off = ptr->info_len_off;
cmd->len_len = ptr->info_len_len;
return (*ptr->get_cdb_info)(cmd, ptr);
cmd->log2_max_buf_len = ptr->log2_max_buf_len;
res = (*ptr->get_cdb_info)(cmd, ptr);
if (!cmd->log2_max_buf_len ||
cmd->bufflen <= (1U << cmd->log2_max_buf_len))
return res;
PRINT_ERROR("Data buffer length %d is too big for SCSI command %s (max %d)",
cmd->bufflen, scst_get_opcode_name(cmd),
1U << cmd->log2_max_buf_len);
scst_set_invalid_field_in_cdb(cmd, cmd->len_off, 0);
return 1;
}
static int get_cdb_info_var_len(struct scst_cmd *cmd,