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block: sed-opal: check size of shadow mbr

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Check whether the shadow mbr does fit in the provided space on the
target. Also a proper firmware should handle this case and return an
error we may prevent problems or even damage with crappy firmwares.

Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>
Reviewed-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jonas Rabenstein
2019-05-21 22:46:46 +02:00
committed by Jens Axboe
parent a9b25b4cf2
commit ff91064ea3
2 changed files with 55 additions and 0 deletions
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39
block/sed-opal.c
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@@ -130,6 +130,8 @@ static const u8 opaluid[][OPAL_UID_LENGTH] = {
/* tables */
[OPAL_TABLE_TABLE]
{ 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01 },
[OPAL_LOCKINGRANGE_GLOBAL] =
{ 0x00, 0x00, 0x08, 0x02, 0x00, 0x00, 0x00, 0x01 },
[OPAL_LOCKINGRANGE_ACE_RDLOCKED] =
@@ -1131,6 +1133,29 @@ static int generic_get_column(struct opal_dev *dev, const u8 *table,
return finalize_and_send(dev, parse_and_check_status);
}
/*
* see TCG SAS 5.3.2.3 for a description of the available columns
*
* the result is provided in dev->resp->tok[4]
*/
static int generic_get_table_info(struct opal_dev *dev, enum opal_uid table,
u64 column)
{
u8 uid[OPAL_UID_LENGTH];
const unsigned int half = OPAL_UID_LENGTH/2;
/* sed-opal UIDs can be split in two halves:
* first: actual table index
* second: relative index in the table
* so we have to get the first half of the OPAL_TABLE_TABLE and use the
* first part of the target table as relative index into that table
*/
memcpy(uid, opaluid[OPAL_TABLE_TABLE], half);
memcpy(uid+half, opaluid[table], half);
return generic_get_column(dev, uid, column);
}
static int gen_key(struct opal_dev *dev, void *data)
{
u8 uid[OPAL_UID_LENGTH];
@@ -1557,6 +1582,20 @@ static int write_shadow_mbr(struct opal_dev *dev, void *data)
u64 len;
int err = 0;
/* do we fit in the available shadow mbr space? */
err = generic_get_table_info(dev, OPAL_MBR, OPAL_TABLE_ROWS);
if (err) {
pr_debug("MBR: could not get shadow size\n");
return err;
}
len = response_get_u64(&dev->parsed, 4);
if (shadow->size > len || shadow->offset > len - shadow->size) {
pr_debug("MBR: does not fit in shadow (%llu vs. %llu)\n",
shadow->offset + shadow->size, len);
return -ENOSPC;
}
/* do the actual transmission(s) */
src = (u8 __user *)(uintptr_t)shadow->data;
while (off < shadow->size) {