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ubifs: Add hashes and HMACs to default filesystem

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This patch calculates the necessary hashes and HMACs for the default
filesystem so that the dynamically created default fs can be
authenticated.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Sascha Hauer 2018-09-07 14:36:43 +02:00 committed by Richard Weinberger
parent e158e02ff7
commit 104115a3eb
1 changed files with 34 additions and 14 deletions
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48
fs/ubifs/sb.c
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@ -87,6 +87,7 @@ static int create_default_filesystem(struct ubifs_info *c)
__le64 tmp_le64;
__le32 tmp_le32;
struct timespec64 ts;
u8 hash[UBIFS_HASH_ARR_SZ];
u8 hash_lpt[UBIFS_HASH_ARR_SZ];
/* Some functions called from here depend on the @c->key_len filed */
@ -177,6 +178,16 @@ static int create_default_filesystem(struct ubifs_info *c)
sup_flags |= UBIFS_FLG_BIGLPT;
sup_flags |= UBIFS_FLG_DOUBLE_HASH;
if (ubifs_authenticated(c)) {
sup_flags |= UBIFS_FLG_AUTHENTICATION;
sup->hash_algo = cpu_to_le16(c->auth_hash_algo);
err = ubifs_hmac_wkm(c, sup->hmac_wkm);
if (err)
goto out;
} else {
sup->hash_algo = 0xffff;
}
sup->ch.node_type = UBIFS_SB_NODE;
sup->key_hash = UBIFS_KEY_HASH_R5;
sup->flags = cpu_to_le32(sup_flags);
@ -235,6 +246,7 @@ static int create_default_filesystem(struct ubifs_info *c)
mst->empty_lebs = cpu_to_le32(main_lebs - 2);
mst->idx_lebs = cpu_to_le32(1);
mst->leb_cnt = cpu_to_le32(c->leb_cnt);
ubifs_copy_hash(c, hash_lpt, mst->hash_lpt);
/* Calculate lprops statistics */
tmp64 = main_bytes;
@ -307,20 +319,8 @@ static int create_default_filesystem(struct ubifs_info *c)
cs->ch.node_type = UBIFS_CS_NODE;
err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0);
if (err)
goto out;
err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0);
if (err)
goto out;
err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1,
0);
if (err)
goto out;
err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0);
err = ubifs_write_node_hmac(c, sup, UBIFS_SB_NODE_SZ, 0, 0,
offsetof(struct ubifs_sb_node, hmac));
if (err)
goto out;
@ -329,6 +329,26 @@ static int create_default_filesystem(struct ubifs_info *c)
if (err)
goto out;
ubifs_node_calc_hash(c, ino, hash);
ubifs_copy_hash(c, hash, ubifs_branch_hash(c, br));
err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0);
if (err)
goto out;
ubifs_node_calc_hash(c, idx, hash);
ubifs_copy_hash(c, hash, mst->hash_root_idx);
err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0,
offsetof(struct ubifs_mst_node, hmac));
if (err)
goto out;
err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1,
0, offsetof(struct ubifs_mst_node, hmac));
if (err)
goto out;
err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 0);
if (err)
goto out;