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| author | Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de> | 2019-05-21 22:46:46 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-06-29 10:34:08 -0600 |
| commit | ff91064ea37c8323eba31cc3d2e22464f107b50d (patch) | |
| tree | eeb913dad6c21bd1e494b9404d0b845518743d35 | |
| parent | a9b25b4cf2b76d320afc999f881ccb805fecdd84 (diff) | |
| download | linux-ff91064ea37c8323eba31cc3d2e22464f107b50d.tar.bz2 | |
block: sed-opal: check size of shadow mbr
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>
| -rw-r--r-- | block/opal_proto.h | 16 | ||||
| -rw-r--r-- | block/sed-opal.c | 39 |
2 files changed, 55 insertions, 0 deletions
diff --git a/block/opal_proto.h b/block/opal_proto.h index d9a05ad02eb5..466ec7be16ef 100644 --- a/block/opal_proto.h +++ b/block/opal_proto.h @@ -98,6 +98,7 @@ enum opal_uid { OPAL_ENTERPRISE_BANDMASTER0_UID, OPAL_ENTERPRISE_ERASEMASTER_UID, /* tables */ + OPAL_TABLE_TABLE, OPAL_LOCKINGRANGE_GLOBAL, OPAL_LOCKINGRANGE_ACE_RDLOCKED, OPAL_LOCKINGRANGE_ACE_WRLOCKED, @@ -152,6 +153,21 @@ enum opal_token { OPAL_STARTCOLUMN = 0x03, OPAL_ENDCOLUMN = 0x04, OPAL_VALUES = 0x01, + /* table table */ + OPAL_TABLE_UID = 0x00, + OPAL_TABLE_NAME = 0x01, + OPAL_TABLE_COMMON = 0x02, + OPAL_TABLE_TEMPLATE = 0x03, + OPAL_TABLE_KIND = 0x04, + OPAL_TABLE_COLUMN = 0x05, + OPAL_TABLE_COLUMNS = 0x06, + OPAL_TABLE_ROWS = 0x07, + OPAL_TABLE_ROWS_FREE = 0x08, + OPAL_TABLE_ROW_BYTES = 0x09, + OPAL_TABLE_LASTID = 0x0A, + OPAL_TABLE_MIN = 0x0B, + OPAL_TABLE_MAX = 0x0C, + /* authority table */ OPAL_PIN = 0x03, /* locking tokens */ diff --git a/block/sed-opal.c b/block/sed-opal.c index b02ef2ff0d75..7e1a444a25b2 100644 --- a/block/sed-opal.c +++ b/block/sed-opal.c @@ -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) { |